开篇
RxAndroid是RxJava基于android的实现,一个在 android VM 上使用可观测的序列来组成异步的、基于事件的程序的库。
RxAndroid在线程切换方便具有很大的优势,先看下官方demo(https://github.com/ReactiveX/RxAndroid)吧。
首先,现在有rxjava和rxjava2两个版本,建议后者吧,在build.gradle中添加依赖:
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
compile 'io.reactivex.rxjava2:rxjava:2.1.0'
然后就可以在代码中使用了,定义被观察者,订阅者。
private final CompositeDisposable disposables = new CompositeDisposable();//定义了一个被观察者容器
Observable<String> m_observable(){
return Observable.defer(new Callable<ObservableSource<? extends String>>() {
@Override
public ObservableSource<? extends String> call() throws Exception {
SystemClock.sleep(2000);
return Observable.just("one", "two", "three", "four", "five");
}
});
} //定义一个被观察者,触发一个延时触发事件
m_disposable.add(m_observable()
.subscribeOn(Schedulers.io()) //切换到io线程
.observeOn(AndroidSchedulers.mainThread()) //切换回主线程
.subscribeWith(new DisposableObserver<String>(){
@Override
public void onNext(@NonNull String s) {
Log.d(TAG, "onNext(" + s + ")");
}
@Override
public void onError(@NonNull Throwable e) {
Log.e(TAG, "onError()", e);
}
@Override
public void onComplete() {
Log.d(TAG, "onComplete()");
}
})
); //添加被观察者和订阅者,此时订阅者在事件触发后只是将字符串打印出来
最后在onDesrtroy方法中取消监听事件
@Override
protected void onDestroy() {
super.onDestroy();
m_disposable.clear();
}
log打印如下:
06-02 14:18:42.746 17927-17927/coll.zhanxun.test1 D/ActivityRxAndroid: onNext(one)
06-02 14:18:42.746 17927-17927/coll.zhanxun.test1 D/ActivityRxAndroid: onNext(two)
06-02 14:18:42.746 17927-17927/coll.zhanxun.test1 D/ActivityRxAndroid: onNext(three)
06-02 14:18:42.746 17927-17927/coll.zhanxun.test1 D/ActivityRxAndroid: onNext(four)
06-02 14:18:42.746 17927-17927/coll.zhanxun.test1 D/ActivityRxAndroid: onNext(five)
06-02 14:18:42.746 17927-17927/coll.zhanxun.test1 D/ActivityRxAndroid: onComplete()
线程切换
RxAndroid核心就是线程切换,在主线程处理触发事件可以这样:
Observable.just("one", "two", "three", "four", "five")
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(/* an Observer */);
,也可以任意线程:
Looper backgroundLooper = // ...
Observable.just("one", "two", "three", "four", "five")
.observeOn(AndroidSchedulers.from(backgroundLooper))
.subscribe(/* an Observer */)
除了CompositeDisposable 和Observable.just方法,Observable类还提供了很多被观察者创建方法,比如create,defer,from等,看代码java2的Observable类:
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
* the License for the specific language governing permissions and limitations under the License.
*/
package io.reactivex;
import java.util.*;
import java.util.concurrent.*;
import org.reactivestreams.Publisher;
import io.reactivex.annotations.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.*;
import io.reactivex.internal.fuseable.ScalarCallable;
import io.reactivex.internal.observers.*;
import io.reactivex.internal.operators.flowable.*;
import io.reactivex.internal.operators.observable.*;
import io.reactivex.internal.util.*;
import io.reactivex.observables.*;
import io.reactivex.observers.*;
import io.reactivex.plugins.RxJavaPlugins;
import io.reactivex.schedulers.*;
/**
* The Observable class that is designed similar to the Reactive-Streams Pattern, minus the backpressure,
* and offers factory methods, intermediate operators and the ability to consume reactive dataflows.
* <p>
* Reactive-Streams operates with {@code ObservableSource}s which {@code Observable} extends. Many operators
* therefore accept general {@code ObservableSource}s directly and allow direct interoperation with other
* Reactive-Streams implementations.
* <p>
* The Observable's operators, by default, run with a buffer size of 128 elements (see {@link Flowable#bufferSize()},
* that can be overridden globally via the system parameter {@code rx2.buffer-size}. Most operators, however, have
* overloads that allow setting their internal buffer size explicitly.
* <p>
* The documentation for this class makes use of marble diagrams. The following legend explains these diagrams:
* <p>
* <img width="640" height="317" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/legend.png" alt="">
* <p>
* For more information see the <a href="http://reactivex.io/documentation/ObservableSource.html">ReactiveX
* documentation</a>.
*
* @param <T>
* the type of the items emitted by the Observable
*/
public abstract class Observable<T> implements ObservableSource<T> {
/**
* Mirrors the one ObservableSource in an Iterable of several ObservableSources that first either emits an item or sends
* a termination notification.
* <p>
* <img width="640" height="385" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/amb.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code amb} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element type
* @param sources
* an Iterable of ObservableSource sources competing to react first. A subscription to each source will
* occur in the same order as in the Iterable.
* @return an Observable that emits the same sequence as whichever of the source ObservableSources first
* emitted an item or sent a termination notification
* @see <a href="http://reactivex.io/documentation/operators/amb.html">ReactiveX operators documentation: Amb</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> amb(Iterable<? extends ObservableSource<? extends T>> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new ObservableAmb<T>(null, sources));
}
/**
* Mirrors the one ObservableSource in an array of several ObservableSources that first either emits an item or sends
* a termination notification.
* <p>
* <img width="640" height="385" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/amb.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code ambArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element type
* @param sources
* an array of ObservableSource sources competing to react first. A subscription to each source will
* occur in the same order as in the array.
* @return an Observable that emits the same sequence as whichever of the source ObservableSources first
* emitted an item or sent a termination notification
* @see <a href="http://reactivex.io/documentation/operators/amb.html">ReactiveX operators documentation: Amb</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> ambArray(ObservableSource<? extends T>... sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
int len = sources.length;
if (len == 0) {
return empty();
}
if (len == 1) {
return (Observable<T>)wrap(sources[0]);
}
return RxJavaPlugins.onAssembly(new ObservableAmb<T>(sources, null));
}
/**
* Returns the default 'island' size or capacity-increment hint for unbounded buffers.
* <p>Delegates to {@link Flowable#bufferSize} but is public for convenience.
* <p>The value can be overridden via system parameter {@code rx2.buffer-size}
* <em>before</em> the {@link Flowable} class is loaded.
* @return the default 'island' size or capacity-increment hint
*/
public static int bufferSize() {
return Flowable.bufferSize();
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @param bufferSize
* the internal buffer size and prefetch amount applied to every source Observable
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatest(Function<? super Object[], ? extends R> combiner, int bufferSize, ObservableSource<? extends T>... sources) {
return combineLatest(sources, combiner, bufferSize);
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatest(Iterable<? extends ObservableSource<? extends T>> sources,
Function<? super Object[], ? extends R> combiner) {
return combineLatest(sources, combiner, bufferSize());
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @param bufferSize
* the internal buffer size and prefetch amount applied to every source Observable
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatest(Iterable<? extends ObservableSource<? extends T>> sources,
Function<? super Object[], ? extends R> combiner, int bufferSize) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
// the queue holds a pair of values so we need to double the capacity
int s = bufferSize << 1;
return RxJavaPlugins.onAssembly(new ObservableCombineLatest<T, R>(null, sources, combiner, s, false));
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatest(ObservableSource<? extends T>[] sources,
Function<? super Object[], ? extends R> combiner) {
return combineLatest(sources, combiner, bufferSize());
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @param bufferSize
* the internal buffer size and prefetch amount applied to every source Observable
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatest(ObservableSource<? extends T>[] sources,
Function<? super Object[], ? extends R> combiner, int bufferSize) {
ObjectHelper.requireNonNull(sources, "sources is null");
if (sources.length == 0) {
return empty();
}
ObjectHelper.requireNonNull(combiner, "combiner is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
// the queue holds a pair of values so we need to double the capacity
int s = bufferSize << 1;
return RxJavaPlugins.onAssembly(new ObservableCombineLatest<T, R>(sources, null, combiner, s, false));
}
/**
* Combines two source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from either of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
BiFunction<? super T1, ? super T2, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2);
}
/**
* Combines three source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3,
Function3<? super T1, ? super T2, ? super T3, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3);
}
/**
* Combines four source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <T4> the element type of the fourth source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param source4
* the fourth source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3, source4);
}
/**
* Combines five source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <T4> the element type of the fourth source
* @param <T5> the element type of the fifth source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param source4
* the fourth source ObservableSource
* @param source5
* the fifth source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
ObservableSource<? extends T5> source5,
Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3, source4, source5);
}
/**
* Combines six source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <T4> the element type of the fourth source
* @param <T5> the element type of the fifth source
* @param <T6> the element type of the sixth source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param source4
* the fourth source ObservableSource
* @param source5
* the fifth source ObservableSource
* @param source6
* the sixth source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3, source4, source5, source6);
}
/**
* Combines seven source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <T4> the element type of the fourth source
* @param <T5> the element type of the fifth source
* @param <T6> the element type of the sixth source
* @param <T7> the element type of the seventh source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param source4
* the fourth source ObservableSource
* @param source5
* the fifth source ObservableSource
* @param source6
* the sixth source ObservableSource
* @param source7
* the seventh source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
ObservableSource<? extends T7> source7,
Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
ObjectHelper.requireNonNull(source7, "source7 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3, source4, source5, source6, source7);
}
/**
* Combines eight source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <T4> the element type of the fourth source
* @param <T5> the element type of the fifth source
* @param <T6> the element type of the sixth source
* @param <T7> the element type of the seventh source
* @param <T8> the element type of the eighth source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param source4
* the fourth source ObservableSource
* @param source5
* the fifth source ObservableSource
* @param source6
* the sixth source ObservableSource
* @param source7
* the seventh source ObservableSource
* @param source8
* the eighth source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8,
Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
ObjectHelper.requireNonNull(source7, "source7 is null");
ObjectHelper.requireNonNull(source8, "source8 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8);
}
/**
* Combines nine source ObservableSources by emitting an item that aggregates the latest values of each of the
* source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatest.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the element type of the first source
* @param <T2> the element type of the second source
* @param <T3> the element type of the third source
* @param <T4> the element type of the fourth source
* @param <T5> the element type of the fifth source
* @param <T6> the element type of the sixth source
* @param <T7> the element type of the seventh source
* @param <T8> the element type of the eighth source
* @param <T9> the element type of the ninth source
* @param <R> the combined output type
* @param source1
* the first source ObservableSource
* @param source2
* the second source ObservableSource
* @param source3
* the third source ObservableSource
* @param source4
* the fourth source ObservableSource
* @param source5
* the fifth source ObservableSource
* @param source6
* the sixth source ObservableSource
* @param source7
* the seventh source ObservableSource
* @param source8
* the eighth source ObservableSource
* @param source9
* the ninth source ObservableSource
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Observable<R> combineLatest(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
ObservableSource<? extends T3> source3, ObservableSource<? extends T4> source4,
ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8,
ObservableSource<? extends T9> source9,
Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> combiner) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
ObjectHelper.requireNonNull(source7, "source7 is null");
ObjectHelper.requireNonNull(source8, "source8 is null");
ObjectHelper.requireNonNull(source9, "source9 is null");
return combineLatest(Functions.toFunction(combiner), bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8, source9);
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatestDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatestDelayError(ObservableSource<? extends T>[] sources,
Function<? super Object[], ? extends R> combiner) {
return combineLatestDelayError(sources, combiner, bufferSize());
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function and delays any error from the sources until
* all source ObservableSources terminate.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatestDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @param bufferSize
* the internal buffer size and prefetch amount applied to every source Observable
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatestDelayError(Function<? super Object[], ? extends R> combiner,
int bufferSize, ObservableSource<? extends T>... sources) {
return combineLatestDelayError(sources, combiner, bufferSize);
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function and delays any error from the sources until
* all source ObservableSources terminate.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatestDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatestDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @param bufferSize
* the internal buffer size and prefetch amount applied to every source Observable
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatestDelayError(ObservableSource<? extends T>[] sources,
Function<? super Object[], ? extends R> combiner, int bufferSize) {
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
ObjectHelper.requireNonNull(combiner, "combiner is null");
if (sources.length == 0) {
return empty();
}
// the queue holds a pair of values so we need to double the capacity
int s = bufferSize << 1;
return RxJavaPlugins.onAssembly(new ObservableCombineLatest<T, R>(sources, null, combiner, s, true));
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function and delays any error from the sources until
* all source ObservableSources terminate.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatestDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatestDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatestDelayError(Iterable<? extends ObservableSource<? extends T>> sources,
Function<? super Object[], ? extends R> combiner) {
return combineLatestDelayError(sources, combiner, bufferSize());
}
/**
* Combines a collection of source ObservableSources by emitting an item that aggregates the latest values of each of
* the source ObservableSources each time an item is received from any of the source ObservableSources, where this
* aggregation is defined by a specified function and delays any error from the sources until
* all source ObservableSources terminate.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
* <p>
* If any of the sources never produces an item but only terminates (normally or with an error), the
* resulting sequence terminates immediately (normally or with all the errors accumulated till that point).
* If that input source is also synchronous, other sources after it will not be subscribed to.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/combineLatestDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code combineLatestDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the common base type of source values
* @param <R>
* the result type
* @param sources
* the collection of source ObservableSources
* @param combiner
* the aggregation function used to combine the items emitted by the source ObservableSources
* @param bufferSize
* the internal buffer size and prefetch amount applied to every source Observable
* @return an Observable that emits items that are the result of combining the items emitted by the source
* ObservableSources by means of the given aggregation function
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> combineLatestDelayError(Iterable<? extends ObservableSource<? extends T>> sources,
Function<? super Object[], ? extends R> combiner, int bufferSize) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
// the queue holds a pair of values so we need to double the capacity
int s = bufferSize << 1;
return RxJavaPlugins.onAssembly(new ObservableCombineLatest<T, R>(null, sources, combiner, s, true));
}
/**
* Concatenates elements of each ObservableSource provided via an Iterable sequence into a single sequence
* of elements without interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the common value type of the sources
* @param sources the Iterable sequence of ObservableSources
* @return the new Observable instance
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concat(Iterable<? extends ObservableSource<? extends T>> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return fromIterable(sources).concatMapDelayError((Function)Functions.identity(), bufferSize(), false);
}
/**
* Returns an Observable that emits the items emitted by each of the ObservableSources emitted by the source
* ObservableSource, one after the other, without interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* an ObservableSource that emits ObservableSources
* @return an Observable that emits items all of the items emitted by the ObservableSources emitted by
* {@code ObservableSources}, one after the other, without interleaving them
* @see <a href="http://reactivex.io/documentation/operators/concat.html">ReactiveX operators documentation: Concat</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concat(ObservableSource<? extends ObservableSource<? extends T>> sources) {
return concat(sources, bufferSize());
}
/**
* Returns an Observable that emits the items emitted by each of the ObservableSources emitted by the source
* ObservableSource, one after the other, without interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* an ObservableSource that emits ObservableSources
* @param prefetch
* the number of ObservableSources to prefetch from the sources sequence.
* @return an Observable that emits items all of the items emitted by the ObservableSources emitted by
* {@code ObservableSources}, one after the other, without interleaving them
* @see <a href="http://reactivex.io/documentation/operators/concat.html">ReactiveX operators documentation: Concat</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concat(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(prefetch, "prefetch");
return RxJavaPlugins.onAssembly(new ObservableConcatMap(sources, Functions.identity(), prefetch, ErrorMode.IMMEDIATE));
}
/**
* Returns an Observable that emits the items emitted by two ObservableSources, one after the other, without
* interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be concatenated
* @param source2
* an ObservableSource to be concatenated
* @return an Observable that emits items emitted by the two source ObservableSources, one after the other,
* without interleaving them
* @see <a href="http://reactivex.io/documentation/operators/concat.html">ReactiveX operators documentation: Concat</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concat(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return concatArray(source1, source2);
}
/**
* Returns an Observable that emits the items emitted by three ObservableSources, one after the other, without
* interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be concatenated
* @param source2
* an ObservableSource to be concatenated
* @param source3
* an ObservableSource to be concatenated
* @return an Observable that emits items emitted by the three source ObservableSources, one after the other,
* without interleaving them
* @see <a href="http://reactivex.io/documentation/operators/concat.html">ReactiveX operators documentation: Concat</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concat(
ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
ObservableSource<? extends T> source3) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
return concatArray(source1, source2, source3);
}
/**
* Returns an Observable that emits the items emitted by four ObservableSources, one after the other, without
* interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be concatenated
* @param source2
* an ObservableSource to be concatenated
* @param source3
* an ObservableSource to be concatenated
* @param source4
* an ObservableSource to be concatenated
* @return an Observable that emits items emitted by the four source ObservableSources, one after the other,
* without interleaving them
* @see <a href="http://reactivex.io/documentation/operators/concat.html">ReactiveX operators documentation: Concat</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concat(
ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
return concatArray(source1, source2, source3, source4);
}
/**
* Concatenates a variable number of ObservableSource sources.
* <p>
* Note: named this way because of overload conflict with concat(ObservableSource<ObservableSource>)
* <p>
* <img width="640" height="290" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the array of sources
* @param <T> the common base value type
* @return the new Observable instance
* @throws NullPointerException if sources is null
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatArray(ObservableSource<? extends T>... sources) {
if (sources.length == 0) {
return empty();
} else
if (sources.length == 1) {
return wrap((ObservableSource<T>)sources[0]);
}
return RxJavaPlugins.onAssembly(new ObservableConcatMap(fromArray(sources), Functions.identity(), bufferSize(), ErrorMode.BOUNDARY));
}
/**
* Concatenates a variable number of ObservableSource sources and delays errors from any of them
* till all terminate.
* <p>
* <img width="640" height="290" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatArrayDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param sources the array of sources
* @param <T> the common base value type
* @return the new Observable instance
* @throws NullPointerException if sources is null
*/
@SuppressWarnings({ "unchecked" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatArrayDelayError(ObservableSource<? extends T>... sources) {
if (sources.length == 0) {
return empty();
} else
if (sources.length == 1) {
return (Observable<T>)wrap(sources[0]);
}
return concatDelayError(fromArray(sources));
}
/**
* Concatenates a sequence of ObservableSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them
* in order, each one after the previous one completes.
* <p>
* <img width="640" height="290" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of ObservableSources that need to be eagerly concatenated
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatArrayEager(ObservableSource<? extends T>... sources) {
return concatArrayEager(bufferSize(), bufferSize(), sources);
}
/**
* Concatenates a sequence of ObservableSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them
* in order, each one after the previous one completes.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of ObservableSources that need to be eagerly concatenated
* @param maxConcurrency the maximum number of concurrent subscriptions at a time, Integer.MAX_VALUE
* is interpreted as indication to subscribe to all sources at once
* @param prefetch the number of elements to prefetch from each ObservableSource source
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatArrayEager(int maxConcurrency, int prefetch, ObservableSource<? extends T>... sources) {
return fromArray(sources).concatMapEagerDelayError((Function)Functions.identity(), maxConcurrency, prefetch, false);
}
/**
* Concatenates the Iterable sequence of ObservableSources into a single sequence by subscribing to each ObservableSource,
* one after the other, one at a time and delays any errors till the all inner ObservableSources terminate.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources the Iterable sequence of ObservableSources
* @return the new ObservableSource with the concatenating behavior
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatDelayError(Iterable<? extends ObservableSource<? extends T>> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return concatDelayError(fromIterable(sources));
}
/**
* Concatenates the ObservableSource sequence of ObservableSources into a single sequence by subscribing to each inner ObservableSource,
* one after the other, one at a time and delays any errors till the all inner and the outer ObservableSources terminate.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources the ObservableSource sequence of ObservableSources
* @return the new ObservableSource with the concatenating behavior
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) {
return concatDelayError(sources, bufferSize(), true);
}
/**
* Concatenates the ObservableSource sequence of ObservableSources into a single sequence by subscribing to each inner ObservableSource,
* one after the other, one at a time and delays any errors till the all inner and the outer ObservableSources terminate.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatDelayError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources the ObservableSource sequence of ObservableSources
* @param prefetch the number of elements to prefetch from the outer ObservableSource
* @param tillTheEnd if true exceptions from the outer and all inner ObservableSources are delayed to the end
* if false, exception from the outer ObservableSource is delayed till the current ObservableSource terminates
* @return the new ObservableSource with the concatenating behavior
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch, boolean tillTheEnd) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(prefetch, "prefetch is null");
return RxJavaPlugins.onAssembly(new ObservableConcatMap(sources, Functions.identity(), prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY));
}
/**
* Concatenates an ObservableSource sequence of ObservableSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* emitted source ObservableSources as they are observed. The operator buffers the values emitted by these
* ObservableSources and then drains them in order, each one after the previous one completes.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatEager.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of ObservableSources that need to be eagerly concatenated
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatEager(ObservableSource<? extends ObservableSource<? extends T>> sources) {
return concatEager(sources, bufferSize(), bufferSize());
}
/**
* Concatenates an ObservableSource sequence of ObservableSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* emitted source ObservableSources as they are observed. The operator buffers the values emitted by these
* ObservableSources and then drains them in order, each one after the previous one completes.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatEager.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of ObservableSources that need to be eagerly concatenated
* @param maxConcurrency the maximum number of concurrently running inner ObservableSources; Integer.MAX_VALUE
* is interpreted as all inner ObservableSources can be active at the same time
* @param prefetch the number of elements to prefetch from each inner ObservableSource source
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatEager(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int prefetch) {
ObjectHelper.requireNonNull(maxConcurrency, "maxConcurrency is null");
ObjectHelper.requireNonNull(prefetch, "prefetch is null");
return wrap(sources).concatMapEager((Function)Functions.identity(), maxConcurrency, prefetch);
}
/**
* Concatenates a sequence of ObservableSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them
* in order, each one after the previous one completes.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatEager.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of ObservableSources that need to be eagerly concatenated
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatEager(Iterable<? extends ObservableSource<? extends T>> sources) {
return concatEager(sources, bufferSize(), bufferSize());
}
/**
* Concatenates a sequence of ObservableSources eagerly into a single stream of values.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them
* in order, each one after the previous one completes.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatEager.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type
* @param sources a sequence of ObservableSources that need to be eagerly concatenated
* @param maxConcurrency the maximum number of concurrently running inner ObservableSources; Integer.MAX_VALUE
* is interpreted as all inner ObservableSources can be active at the same time
* @param prefetch the number of elements to prefetch from each inner ObservableSource source
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> concatEager(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int prefetch) {
ObjectHelper.requireNonNull(maxConcurrency, "maxConcurrency is null");
ObjectHelper.requireNonNull(prefetch, "prefetch is null");
return fromIterable(sources).concatMapEagerDelayError((Function)Functions.identity(), maxConcurrency, prefetch, false);
}
/**
* Provides an API (via a cold Observable) that bridges the reactive world with the callback-style world.
* <p>
* Example:
* <pre><code>
* Observable.<Event>create(emitter -> {
* Callback listener = new Callback() {
* @Override
* public void onEvent(Event e) {
* emitter.onNext(e);
* if (e.isLast()) {
* emitter.onComplete();
* }
* }
*
* @Override
* public void onFailure(Exception e) {
* emitter.onError(e);
* }
* };
*
* AutoCloseable c = api.someMethod(listener);
*
* emitter.setCancellable(c::close);
*
* });
* </code></pre>
* <p>
* <img width="640" height="200" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/create.png" alt="">
* <p>
* You should call the ObservableEmitter's onNext, onError and onComplete methods in a serialized fashion. The
* rest of its methods are thread-safe.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code create} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the element type
* @param source the emitter that is called when an Observer subscribes to the returned {@code Observable}
* @return the new Observable instance
* @see ObservableOnSubscribe
* @see ObservableEmitter
* @see Cancellable
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> create(ObservableOnSubscribe<T> source) {
ObjectHelper.requireNonNull(source, "source is null");
return RxJavaPlugins.onAssembly(new ObservableCreate<T>(source));
}
/**
* Returns an Observable that calls an ObservableSource factory to create an ObservableSource for each new Observer
* that subscribes. That is, for each subscriber, the actual ObservableSource that subscriber observes is
* determined by the factory function.
* <p>
* <img width="640" height="340" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/defer.png" alt="">
* <p>
* The defer Observer allows you to defer or delay emitting items from an ObservableSource until such time as an
* Observer subscribes to the ObservableSource. This allows an {@link Observer} to easily obtain updates or a
* refreshed version of the sequence.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code defer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param supplier
* the ObservableSource factory function to invoke for each {@link Observer} that subscribes to the
* resulting ObservableSource
* @param <T>
* the type of the items emitted by the ObservableSource
* @return an Observable whose {@link Observer}s' subscriptions trigger an invocation of the given
* ObservableSource factory function
* @see <a href="http://reactivex.io/documentation/operators/defer.html">ReactiveX operators documentation: Defer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> defer(Callable<? extends ObservableSource<? extends T>> supplier) {
ObjectHelper.requireNonNull(supplier, "supplier is null");
return RxJavaPlugins.onAssembly(new ObservableDefer<T>(supplier));
}
/**
* Returns an Observable that emits no items to the {@link Observer} and immediately invokes its
* {@link Observer#onComplete onComplete} method.
* <p>
* <img width="640" height="190" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/empty.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code empty} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the type of the items (ostensibly) emitted by the ObservableSource
* @return an Observable that emits no items to the {@link Observer} but immediately invokes the
* {@link Observer}'s {@link Observer#onComplete() onComplete} method
* @see <a href="http://reactivex.io/documentation/operators/empty-never-throw.html">ReactiveX operators documentation: Empty</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@SuppressWarnings("unchecked")
public static <T> Observable<T> empty() {
return RxJavaPlugins.onAssembly((Observable<T>) ObservableEmpty.INSTANCE);
}
/**
* Returns an Observable that invokes an {@link Observer}'s {@link Observer#onError onError} method when the
* Observer subscribes to it.
* <p>
* <img width="640" height="190" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/error.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param errorSupplier
* a Callable factory to return a Throwable for each individual Observer
* @param <T>
* the type of the items (ostensibly) emitted by the ObservableSource
* @return an Observable that invokes the {@link Observer}'s {@link Observer#onError onError} method when
* the Observer subscribes to it
* @see <a href="http://reactivex.io/documentation/operators/empty-never-throw.html">ReactiveX operators documentation: Throw</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> error(Callable<? extends Throwable> errorSupplier) {
ObjectHelper.requireNonNull(errorSupplier, "errorSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableError<T>(errorSupplier));
}
/**
* Returns an Observable that invokes an {@link Observer}'s {@link Observer#onError onError} method when the
* Observer subscribes to it.
* <p>
* <img width="640" height="190" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/error.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code error} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param exception
* the particular Throwable to pass to {@link Observer#onError onError}
* @param <T>
* the type of the items (ostensibly) emitted by the ObservableSource
* @return an Observable that invokes the {@link Observer}'s {@link Observer#onError onError} method when
* the Observer subscribes to it
* @see <a href="http://reactivex.io/documentation/operators/empty-never-throw.html">ReactiveX operators documentation: Throw</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> error(final Throwable exception) {
ObjectHelper.requireNonNull(exception, "e is null");
return error(Functions.justCallable(exception));
}
/**
* Converts an Array into an ObservableSource that emits the items in the Array.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param items
* the array of elements
* @param <T>
* the type of items in the Array and the type of items to be emitted by the resulting ObservableSource
* @return an Observable that emits each item in the source Array
* @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> fromArray(T... items) {
ObjectHelper.requireNonNull(items, "items is null");
if (items.length == 0) {
return empty();
} else
if (items.length == 1) {
return just(items[0]);
}
return RxJavaPlugins.onAssembly(new ObservableFromArray<T>(items));
}
/**
* Returns an Observable that, when an observer subscribes to it, invokes a function you specify and then
* emits the value returned from that function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/fromCallable.png" alt="">
* <p>
* This allows you to defer the execution of the function you specify until an observer subscribes to the
* ObservableSource. That is to say, it makes the function "lazy."
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromCallable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param supplier
* a function, the execution of which should be deferred; {@code fromCallable} will invoke this
* function only when an observer subscribes to the ObservableSource that {@code fromCallable} returns
* @param <T>
* the type of the item emitted by the ObservableSource
* @return an Observable whose {@link Observer}s' subscriptions trigger an invocation of the given function
* @see #defer(Callable)
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> fromCallable(Callable<? extends T> supplier) {
ObjectHelper.requireNonNull(supplier, "supplier is null");
return RxJavaPlugins.onAssembly(new ObservableFromCallable<T>(supplier));
}
/**
* Converts a {@link Future} into an ObservableSource.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.Future.png" alt="">
* <p>
* You can convert any object that supports the {@link Future} interface into an ObservableSource that emits the
* return value of the {@link Future#get} method of that object, by passing the object into the {@code from}
* method.
* <p>
* <em>Important note:</em> This ObservableSource is blocking; you cannot dispose it.
* <p>
* Unlike 1.x, cancelling the Observable won't cancel the future. If necessary, one can use composition to achieve the
* cancellation effect: {@code futureObservableSource.doOnCancel(() -> future.cancel(true));}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromFuture} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param future
* the source {@link Future}
* @param <T>
* the type of object that the {@link Future} returns, and also the type of item to be emitted by
* the resulting ObservableSource
* @return an Observable that emits the item from the source {@link Future}
* @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> fromFuture(Future<? extends T> future) {
ObjectHelper.requireNonNull(future, "future is null");
return RxJavaPlugins.onAssembly(new ObservableFromFuture<T>(future, 0L, null));
}
/**
* Converts a {@link Future} into an ObservableSource, with a timeout on the Future.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.Future.png" alt="">
* <p>
* You can convert any object that supports the {@link Future} interface into an ObservableSource that emits the
* return value of the {@link Future#get} method of that object, by passing the object into the {@code from}
* method.
* <p>
* Unlike 1.x, cancelling the Observable won't cancel the future. If necessary, one can use composition to achieve the
* cancellation effect: {@code futureObservableSource.doOnCancel(() -> future.cancel(true));}.
* <p>
* <em>Important note:</em> This ObservableSource is blocking; you cannot dispose it.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromFuture} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param future
* the source {@link Future}
* @param timeout
* the maximum time to wait before calling {@code get}
* @param unit
* the {@link TimeUnit} of the {@code timeout} argument
* @param <T>
* the type of object that the {@link Future} returns, and also the type of item to be emitted by
* the resulting ObservableSource
* @return an Observable that emits the item from the source {@link Future}
* @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit) {
ObjectHelper.requireNonNull(future, "future is null");
ObjectHelper.requireNonNull(unit, "unit is null");
return RxJavaPlugins.onAssembly(new ObservableFromFuture<T>(future, timeout, unit));
}
/**
* Converts a {@link Future} into an ObservableSource, with a timeout on the Future.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.Future.png" alt="">
* <p>
* You can convert any object that supports the {@link Future} interface into an ObservableSource that emits the
* return value of the {@link Future#get} method of that object, by passing the object into the {@code from}
* method.
* <p>
* Unlike 1.x, cancelling the Observable won't cancel the future. If necessary, one can use composition to achieve the
* cancellation effect: {@code futureObservableSource.doOnCancel(() -> future.cancel(true));}.
* <p>
* <em>Important note:</em> This ObservableSource is blocking; you cannot dispose it.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromFuture} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param future
* the source {@link Future}
* @param timeout
* the maximum time to wait before calling {@code get}
* @param unit
* the {@link TimeUnit} of the {@code timeout} argument
* @param scheduler
* the {@link Scheduler} to wait for the Future on. Use a Scheduler such as
* {@link Schedulers#io()} that can block and wait on the Future
* @param <T>
* the type of object that the {@link Future} returns, and also the type of item to be emitted by
* the resulting ObservableSource
* @return an Observable that emits the item from the source {@link Future}
* @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static <T> Observable<T> fromFuture(Future<? extends T> future, long timeout, TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
Observable<T> o = fromFuture(future, timeout, unit);
return o.subscribeOn(scheduler);
}
/**
* Converts a {@link Future}, operating on a specified {@link Scheduler}, into an ObservableSource.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.Future.s.png" alt="">
* <p>
* You can convert any object that supports the {@link Future} interface into an ObservableSource that emits the
* return value of the {@link Future#get} method of that object, by passing the object into the {@code from}
* method.
* <p>
* Unlike 1.x, cancelling the Observable won't cancel the future. If necessary, one can use composition to achieve the
* cancellation effect: {@code futureObservableSource.doOnCancel(() -> future.cancel(true));}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param future
* the source {@link Future}
* @param scheduler
* the {@link Scheduler} to wait for the Future on. Use a Scheduler such as
* {@link Schedulers#io()} that can block and wait on the Future
* @param <T>
* the type of object that the {@link Future} returns, and also the type of item to be emitted by
* the resulting ObservableSource
* @return an Observable that emits the item from the source {@link Future}
* @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static <T> Observable<T> fromFuture(Future<? extends T> future, Scheduler scheduler) {
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
Observable<T> o = fromFuture(future);
return o.subscribeOn(scheduler);
}
/**
* Converts an {@link Iterable} sequence into an ObservableSource that emits the items in the sequence.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/from.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param source
* the source {@link Iterable} sequence
* @param <T>
* the type of items in the {@link Iterable} sequence and the type of items to be emitted by the
* resulting ObservableSource
* @return an Observable that emits each item in the source {@link Iterable} sequence
* @see <a href="http://reactivex.io/documentation/operators/from.html">ReactiveX operators documentation: From</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> fromIterable(Iterable<? extends T> source) {
ObjectHelper.requireNonNull(source, "source is null");
return RxJavaPlugins.onAssembly(new ObservableFromIterable<T>(source));
}
/**
* Converts an arbitrary Reactive-Streams Publisher into an Observable.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The source {@code publisher} is consumed in an unbounded fashion without applying any
* backpressure to it.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code fromPublisher} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type of the flow
* @param publisher the Publisher to convert
* @return the new Observable instance
* @throws NullPointerException if publisher is null
*/
@BackpressureSupport(BackpressureKind.UNBOUNDED_IN)
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> fromPublisher(Publisher<? extends T> publisher) {
ObjectHelper.requireNonNull(publisher, "publisher is null");
return RxJavaPlugins.onAssembly(new ObservableFromPublisher<T>(publisher));
}
/**
* Returns a cold, synchronous and stateless generator of values.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/generate.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code generate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the generated value type
* @param generator the Consumer called whenever a particular downstream Observer has
* requested a value. The callback then should call {@code onNext}, {@code onError} or
* {@code onComplete} to signal a value or a terminal event. Signalling multiple {@code onNext}
* in a call will make the operator signal {@code IllegalStateException}.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> generate(final Consumer<Emitter<T>> generator) {
ObjectHelper.requireNonNull(generator, "generator is null");
return generate(Functions.<Object>nullSupplier(),
ObservableInternalHelper.simpleGenerator(generator), Functions.<Object>emptyConsumer());
}
/**
* Returns a cold, synchronous and stateful generator of values.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/generate.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code generate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <S> the type of the per-Observer state
* @param <T> the generated value type
* @param initialState the Callable to generate the initial state for each Observer
* @param generator the Consumer called with the current state whenever a particular downstream Observer has
* requested a value. The callback then should call {@code onNext}, {@code onError} or
* {@code onComplete} to signal a value or a terminal event. Signalling multiple {@code onNext}
* in a call will make the operator signal {@code IllegalStateException}.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, S> Observable<T> generate(Callable<S> initialState, final BiConsumer<S, Emitter<T>> generator) {
ObjectHelper.requireNonNull(generator, "generator is null");
return generate(initialState, ObservableInternalHelper.simpleBiGenerator(generator), Functions.emptyConsumer());
}
/**
* Returns a cold, synchronous and stateful generator of values.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/generate.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code generate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <S> the type of the per-Observer state
* @param <T> the generated value type
* @param initialState the Callable to generate the initial state for each Observer
* @param generator the Consumer called with the current state whenever a particular downstream Observer has
* requested a value. The callback then should call {@code onNext}, {@code onError} or
* {@code onComplete} to signal a value or a terminal event. Signalling multiple {@code onNext}
* in a call will make the operator signal {@code IllegalStateException}.
* @param disposeState the Consumer that is called with the current state when the generator
* terminates the sequence or it gets cancelled
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, S> Observable<T> generate(
final Callable<S> initialState,
final BiConsumer<S, Emitter<T>> generator,
Consumer<? super S> disposeState) {
ObjectHelper.requireNonNull(generator, "generator is null");
return generate(initialState, ObservableInternalHelper.simpleBiGenerator(generator), disposeState);
}
/**
* Returns a cold, synchronous and stateful generator of values.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/generate.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code generate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <S> the type of the per-Observer state
* @param <T> the generated value type
* @param initialState the Callable to generate the initial state for each Observer
* @param generator the Function called with the current state whenever a particular downstream Observer has
* requested a value. The callback then should call {@code onNext}, {@code onError} or
* {@code onComplete} to signal a value or a terminal event and should return a (new) state for
* the next invocation. Signalling multiple {@code onNext}
* in a call will make the operator signal {@code IllegalStateException}.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, S> Observable<T> generate(Callable<S> initialState, BiFunction<S, Emitter<T>, S> generator) {
return generate(initialState, generator, Functions.emptyConsumer());
}
/**
* Returns a cold, synchronous and stateful generator of values.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/generate.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code generate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <S> the type of the per-Observer state
* @param <T> the generated value type
* @param initialState the Callable to generate the initial state for each Observer
* @param generator the Function called with the current state whenever a particular downstream Observer has
* requested a value. The callback then should call {@code onNext}, {@code onError} or
* {@code onComplete} to signal a value or a terminal event and should return a (new) state for
* the next invocation. Signalling multiple {@code onNext}
* in a call will make the operator signal {@code IllegalStateException}.
* @param disposeState the Consumer that is called with the current state when the generator
* terminates the sequence or it gets cancelled
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, S> Observable<T> generate(Callable<S> initialState, BiFunction<S, Emitter<T>, S> generator,
Consumer<? super S> disposeState) {
ObjectHelper.requireNonNull(initialState, "initialState is null");
ObjectHelper.requireNonNull(generator, "generator is null");
ObjectHelper.requireNonNull(disposeState, "disposeState is null");
return RxJavaPlugins.onAssembly(new ObservableGenerate<T, S>(initialState, generator, disposeState));
}
/**
* Returns an Observable that emits a {@code 0L} after the {@code initialDelay} and ever increasing numbers
* after each {@code period} of time thereafter.
* <p>
* <img width="640" height="200" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timer.p.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code interval} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param initialDelay
* the initial delay time to wait before emitting the first value of 0L
* @param period
* the period of time between emissions of the subsequent numbers
* @param unit
* the time unit for both {@code initialDelay} and {@code period}
* @return an Observable that emits a 0L after the {@code initialDelay} and ever increasing numbers after
* each {@code period} of time thereafter
* @see <a href="http://reactivex.io/documentation/operators/interval.html">ReactiveX operators documentation: Interval</a>
* @since 1.0.12
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public static Observable<Long> interval(long initialDelay, long period, TimeUnit unit) {
return interval(initialDelay, period, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits a {@code 0L} after the {@code initialDelay} and ever increasing numbers
* after each {@code period} of time thereafter, on a specified {@link Scheduler}.
* <p>
* <img width="640" height="200" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timer.ps.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param initialDelay
* the initial delay time to wait before emitting the first value of 0L
* @param period
* the period of time between emissions of the subsequent numbers
* @param unit
* the time unit for both {@code initialDelay} and {@code period}
* @param scheduler
* the Scheduler on which the waiting happens and items are emitted
* @return an Observable that emits a 0L after the {@code initialDelay} and ever increasing numbers after
* each {@code period} of time thereafter, while running on the given Scheduler
* @see <a href="http://reactivex.io/documentation/operators/interval.html">ReactiveX operators documentation: Interval</a>
* @since 1.0.12
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static Observable<Long> interval(long initialDelay, long period, TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableInterval(Math.max(0L, initialDelay), Math.max(0L, period), unit, scheduler));
}
/**
* Returns an Observable that emits a sequential number every specified interval of time.
* <p>
* <img width="640" height="195" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/interval.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code interval} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param period
* the period size in time units (see below)
* @param unit
* time units to use for the interval size
* @return an Observable that emits a sequential number each time interval
* @see <a href="http://reactivex.io/documentation/operators/interval.html">ReactiveX operators documentation: Interval</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public static Observable<Long> interval(long period, TimeUnit unit) {
return interval(period, period, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits a sequential number every specified interval of time, on a
* specified Scheduler.
* <p>
* <img width="640" height="200" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/interval.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param period
* the period size in time units (see below)
* @param unit
* time units to use for the interval size
* @param scheduler
* the Scheduler to use for scheduling the items
* @return an Observable that emits a sequential number each time interval
* @see <a href="http://reactivex.io/documentation/operators/interval.html">ReactiveX operators documentation: Interval</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static Observable<Long> interval(long period, TimeUnit unit, Scheduler scheduler) {
return interval(period, period, unit, scheduler);
}
/**
* Signals a range of long values, the first after some initial delay and the rest periodically after.
* <p>
* The sequence completes immediately after the last value (start + count - 1) has been reached.
* <p>
* <img width="640" height="195" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/intervalRange.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code intervalRange} by default operates on the {@link Schedulers#computation() computation} {@link Scheduler}.</dd>
* </dl>
* @param start that start value of the range
* @param count the number of values to emit in total, if zero, the operator emits an onComplete after the initial delay.
* @param initialDelay the initial delay before signalling the first value (the start)
* @param period the period between subsequent values
* @param unit the unit of measure of the initialDelay and period amounts
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public static Observable<Long> intervalRange(long start, long count, long initialDelay, long period, TimeUnit unit) {
return intervalRange(start, count, initialDelay, period, unit, Schedulers.computation());
}
/**
* Signals a range of long values, the first after some initial delay and the rest periodically after.
* <p>
* The sequence completes immediately after the last value (start + count - 1) has been reached.
* <p>
* <img width="640" height="195" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/intervalRange.s.png" alt=""> * <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>you provide the {@link Scheduler}.</dd>
* </dl>
* @param start that start value of the range
* @param count the number of values to emit in total, if zero, the operator emits an onComplete after the initial delay.
* @param initialDelay the initial delay before signalling the first value (the start)
* @param period the period between subsequent values
* @param unit the unit of measure of the initialDelay and period amounts
* @param scheduler the target scheduler where the values and terminal signals will be emitted
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static Observable<Long> intervalRange(long start, long count, long initialDelay, long period, TimeUnit unit, Scheduler scheduler) {
if (count < 0) {
throw new IllegalArgumentException("count >= 0 required but it was " + count);
}
if (count == 0L) {
return Observable.<Long>empty().delay(initialDelay, unit, scheduler);
}
long end = start + (count - 1);
if (start > 0 && end < 0) {
throw new IllegalArgumentException("Overflow! start + count is bigger than Long.MAX_VALUE");
}
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableIntervalRange(start, end, Math.max(0L, initialDelay), Math.max(0L, period), unit, scheduler));
}
/**
* Returns an Observable that emits a single item and then completes.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.png" alt="">
* <p>
* To convert any object into an ObservableSource that emits that object, pass that object into the {@code just}
* method.
* <p>
* This is similar to the {@link #fromArray(java.lang.Object[])} method, except that {@code from} will convert
* an {@link Iterable} object into an ObservableSource that emits each of the items in the Iterable, one at a
* time, while the {@code just} method converts an Iterable into an ObservableSource that emits the entire
* Iterable as a single item.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item
* the item to emit
* @param <T>
* the type of that item
* @return an Observable that emits {@code value} as a single item and then completes
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item) {
ObjectHelper.requireNonNull(item, "The item is null");
return RxJavaPlugins.onAssembly(new ObservableJust<T>(item));
}
/**
* Converts two items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
return fromArray(item1, item2);
}
/**
* Converts three items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
return fromArray(item1, item2, item3);
}
/**
* Converts four items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
return fromArray(item1, item2, item3, item4);
}
/**
* Converts five items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param item5
* fifth item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
ObjectHelper.requireNonNull(item5, "The fifth item is null");
return fromArray(item1, item2, item3, item4, item5);
}
/**
* Converts six items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param item5
* fifth item
* @param item6
* sixth item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
ObjectHelper.requireNonNull(item5, "The fifth item is null");
ObjectHelper.requireNonNull(item6, "The sixth item is null");
return fromArray(item1, item2, item3, item4, item5, item6);
}
/**
* Converts seven items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param item5
* fifth item
* @param item6
* sixth item
* @param item7
* seventh item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
ObjectHelper.requireNonNull(item5, "The fifth item is null");
ObjectHelper.requireNonNull(item6, "The sixth item is null");
ObjectHelper.requireNonNull(item7, "The seventh item is null");
return fromArray(item1, item2, item3, item4, item5, item6, item7);
}
/**
* Converts eight items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param item5
* fifth item
* @param item6
* sixth item
* @param item7
* seventh item
* @param item8
* eighth item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
ObjectHelper.requireNonNull(item5, "The fifth item is null");
ObjectHelper.requireNonNull(item6, "The sixth item is null");
ObjectHelper.requireNonNull(item7, "The seventh item is null");
ObjectHelper.requireNonNull(item8, "The eighth item is null");
return fromArray(item1, item2, item3, item4, item5, item6, item7, item8);
}
/**
* Converts nine items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param item5
* fifth item
* @param item6
* sixth item
* @param item7
* seventh item
* @param item8
* eighth item
* @param item9
* ninth item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
ObjectHelper.requireNonNull(item5, "The fifth item is null");
ObjectHelper.requireNonNull(item6, "The sixth item is null");
ObjectHelper.requireNonNull(item7, "The seventh item is null");
ObjectHelper.requireNonNull(item8, "The eighth item is null");
ObjectHelper.requireNonNull(item9, "The ninth item is null");
return fromArray(item1, item2, item3, item4, item5, item6, item7, item8, item9);
}
/**
* Converts ten items into an ObservableSource that emits those items.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/just.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code just} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item1
* first item
* @param item2
* second item
* @param item3
* third item
* @param item4
* fourth item
* @param item5
* fifth item
* @param item6
* sixth item
* @param item7
* seventh item
* @param item8
* eighth item
* @param item9
* ninth item
* @param item10
* tenth item
* @param <T>
* the type of these items
* @return an Observable that emits each item
* @see <a href="http://reactivex.io/documentation/operators/just.html">ReactiveX operators documentation: Just</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> just(T item1, T item2, T item3, T item4, T item5, T item6, T item7, T item8, T item9, T item10) {
ObjectHelper.requireNonNull(item1, "The first item is null");
ObjectHelper.requireNonNull(item2, "The second item is null");
ObjectHelper.requireNonNull(item3, "The third item is null");
ObjectHelper.requireNonNull(item4, "The fourth item is null");
ObjectHelper.requireNonNull(item5, "The fifth item is null");
ObjectHelper.requireNonNull(item6, "The sixth item is null");
ObjectHelper.requireNonNull(item7, "The seventh item is null");
ObjectHelper.requireNonNull(item8, "The eighth item is null");
ObjectHelper.requireNonNull(item9, "The ninth item is null");
ObjectHelper.requireNonNull(item10, "The tenth item is null");
return fromArray(item1, item2, item3, item4, item5, item6, item7, item8, item9, item10);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation, while limiting the
* number of concurrent subscriptions to these ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine the items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param bufferSize
* the number of items to prefetch from each inner ObservableSource
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @throws IllegalArgumentException
* if {@code maxConcurrent} is less than or equal to 0
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int bufferSize) {
return fromIterable(sources).flatMap((Function)Functions.identity(), false, maxConcurrency, bufferSize);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation, while limiting the
* number of concurrent subscriptions to these ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine the items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the array of ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param bufferSize
* the number of items to prefetch from each inner ObservableSource
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @throws IllegalArgumentException
* if {@code maxConcurrent} is less than or equal to 0
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeArray(int maxConcurrency, int bufferSize, ObservableSource<? extends T>... sources) {
return fromArray(sources).flatMap((Function)Functions.identity(), false, maxConcurrency, bufferSize);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine the items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(Iterable<? extends ObservableSource<? extends T>> sources) {
return fromIterable(sources).flatMap((Function)Functions.identity());
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, without any transformation, while limiting the
* number of concurrent subscriptions to these ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine the items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @throws IllegalArgumentException
* if {@code maxConcurrent} is less than or equal to 0
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency) {
return fromIterable(sources).flatMap((Function)Functions.identity(), maxConcurrency);
}
/**
* Flattens an ObservableSource that emits ObservableSources into a single ObservableSource that emits the items emitted by
* those ObservableSources, without any transformation.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.oo.png" alt="">
* <p>
* You can combine the items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* an ObservableSource that emits ObservableSources
* @return an Observable that emits items that are the result of flattening the ObservableSources emitted by the
* {@code source} ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@SuppressWarnings({ "unchecked", "rawtypes" })
public static <T> Observable<T> merge(ObservableSource<? extends ObservableSource<? extends T>> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), false, Integer.MAX_VALUE, bufferSize()));
}
/**
* Flattens an ObservableSource that emits ObservableSources into a single ObservableSource that emits the items emitted by
* those ObservableSources, without any transformation, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.oo.png" alt="">
* <p>
* You can combine the items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* an ObservableSource that emits ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits items that are the result of flattening the ObservableSources emitted by the
* {@code source} ObservableSource
* @throws IllegalArgumentException
* if {@code maxConcurrent} is less than or equal to 0
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
* @since 1.1.0
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), false, maxConcurrency, bufferSize()));
}
/**
* Flattens two ObservableSources into a single ObservableSource, without any transformation.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be merged
* @param source2
* an ObservableSource to be merged
* @return an Observable that emits all of the items emitted by the source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return fromArray(source1, source2).flatMap((Function)Functions.identity(), false, 2);
}
/**
* Flattens three ObservableSources into a single ObservableSource, without any transformation.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be merged
* @param source2
* an ObservableSource to be merged
* @param source3
* an ObservableSource to be merged
* @return an Observable that emits all of the items emitted by the source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
return fromArray(source1, source2, source3).flatMap((Function)Functions.identity(), false, 3);
}
/**
* Flattens four ObservableSources into a single ObservableSource, without any transformation.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code merge} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be merged
* @param source2
* an ObservableSource to be merged
* @param source3
* an ObservableSource to be merged
* @param source4
* an ObservableSource to be merged
* @return an Observable that emits all of the items emitted by the source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> merge(
ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
return fromArray(source1, source2, source3, source4).flatMap((Function)Functions.identity(), false, 4);
}
/**
* Flattens an Array of ObservableSources into one ObservableSource, without any transformation.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.io.png" alt="">
* <p>
* You can combine items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code merge} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the array of ObservableSources
* @return an Observable that emits all of the items emitted by the ObservableSources in the Array
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeArray(ObservableSource<? extends T>... sources) {
return fromArray(sources).flatMap((Function)Functions.identity(), sources.length);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from each of the source ObservableSources without being interrupted by an error
* notification from one of them.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(Iterable<? extends ObservableSource<? extends T>> sources) {
return fromIterable(sources).flatMap((Function)Functions.identity(), true);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from each of the source ObservableSources without being interrupted by an error
* notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param bufferSize
* the number of items to prefetch from each inner ObservableSource
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency, int bufferSize) {
return fromIterable(sources).flatMap((Function)Functions.identity(), true, maxConcurrency, bufferSize);
}
/**
* Flattens an array of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from each of the source ObservableSources without being interrupted by an error
* notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeArrayDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the array of ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param bufferSize
* the number of items to prefetch from each inner ObservableSource
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeArrayDelayError(int maxConcurrency, int bufferSize, ObservableSource<? extends T>... sources) {
return fromArray(sources).flatMap((Function)Functions.identity(), true, maxConcurrency, bufferSize);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from each of the source ObservableSources without being interrupted by an error
* notification from one of them, while limiting the number of concurrent subscriptions to these ObservableSources.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(Iterable<? extends ObservableSource<? extends T>> sources, int maxConcurrency) {
return fromIterable(sources).flatMap((Function)Functions.identity(), true, maxConcurrency);
}
/**
* Flattens an ObservableSource that emits ObservableSources into one ObservableSource, in a way that allows an Observer to
* receive all successfully emitted items from all of the source ObservableSources without being interrupted by
* an error notification from one of them.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* an ObservableSource that emits ObservableSources
* @return an Observable that emits all of the items emitted by the ObservableSources emitted by the
* {@code source} ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@SuppressWarnings({ "unchecked", "rawtypes" })
public static <T> Observable<T> mergeDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) {
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), true, Integer.MAX_VALUE, bufferSize()));
}
/**
* Flattens an ObservableSource that emits ObservableSources into one ObservableSource, in a way that allows an Observer to
* receive all successfully emitted items from all of the source ObservableSources without being interrupted by
* an error notification from one of them, while limiting the
* number of concurrent subscriptions to these ObservableSources.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* an ObservableSource that emits ObservableSources
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits all of the items emitted by the ObservableSources emitted by the
* {@code source} ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
* @since 2.0
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int maxConcurrency) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
return RxJavaPlugins.onAssembly(new ObservableFlatMap(sources, Functions.identity(), true, maxConcurrency, bufferSize()));
}
/**
* Flattens two ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from each of the source ObservableSources without being interrupted by an error
* notification from one of them.
* <p>
* This behaves like {@link #merge(ObservableSource, ObservableSource)} except that if any of the merged ObservableSources
* notify of an error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from
* propagating that error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if both merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be merged
* @param source2
* an ObservableSource to be merged
* @return an Observable that emits all of the items that are emitted by the two source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return fromArray(source1, source2).flatMap((Function)Functions.identity(), true, 2);
}
/**
* Flattens three ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from all of the source ObservableSources without being interrupted by an error
* notification from one of them.
* <p>
* This behaves like {@link #merge(ObservableSource, ObservableSource, ObservableSource)} except that if any of the merged
* ObservableSources notify of an error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain
* from propagating that error notification until all of the merged ObservableSources have finished emitting
* items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be merged
* @param source2
* an ObservableSource to be merged
* @param source3
* an ObservableSource to be merged
* @return an Observable that emits all of the items that are emitted by the source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2, ObservableSource<? extends T> source3) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
return fromArray(source1, source2, source3).flatMap((Function)Functions.identity(), true, 3);
}
/**
* Flattens four ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from all of the source ObservableSources without being interrupted by an error
* notification from one of them.
* <p>
* This behaves like {@link #merge(ObservableSource, ObservableSource, ObservableSource, ObservableSource)} except that if any of
* the merged ObservableSources notify of an error via {@link Observer#onError onError}, {@code mergeDelayError}
* will refrain from propagating that error notification until all of the merged ObservableSources have finished
* emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param source1
* an ObservableSource to be merged
* @param source2
* an ObservableSource to be merged
* @param source3
* an ObservableSource to be merged
* @param source4
* an ObservableSource to be merged
* @return an Observable that emits all of the items that are emitted by the source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeDelayError(
ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
ObservableSource<? extends T> source3, ObservableSource<? extends T> source4) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
return fromArray(source1, source2, source3, source4).flatMap((Function)Functions.identity(), true, 4);
}
/**
* Flattens an Iterable of ObservableSources into one ObservableSource, in a way that allows an Observer to receive all
* successfully emitted items from each of the source ObservableSources without being interrupted by an error
* notification from one of them.
* <p>
* This behaves like {@link #merge(ObservableSource)} except that if any of the merged ObservableSources notify of an
* error via {@link Observer#onError onError}, {@code mergeDelayError} will refrain from propagating that
* error notification until all of the merged ObservableSources have finished emitting items.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeDelayError.png" alt="">
* <p>
* Even if multiple merged ObservableSources send {@code onError} notifications, {@code mergeDelayError} will only
* invoke the {@code onError} method of its Observers once.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeArrayDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element base type
* @param sources
* the Iterable of ObservableSources
* @return an Observable that emits items that are the result of flattening the items emitted by the
* ObservableSources in the Iterable
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> mergeArrayDelayError(ObservableSource<? extends T>... sources) {
return fromArray(sources).flatMap((Function)Functions.identity(), true, sources.length);
}
/**
* Returns an Observable that never sends any items or notifications to an {@link Observer}.
* <p>
* <img width="640" height="185" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/never.png" alt="">
* <p>
* This ObservableSource is useful primarily for testing purposes.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code never} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T>
* the type of items (not) emitted by the ObservableSource
* @return an Observable that never emits any items or sends any notifications to an {@link Observer}
* @see <a href="http://reactivex.io/documentation/operators/empty-never-throw.html">ReactiveX operators documentation: Never</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@SuppressWarnings("unchecked")
public static <T> Observable<T> never() {
return RxJavaPlugins.onAssembly((Observable<T>) ObservableNever.INSTANCE);
}
/**
* Returns an Observable that emits a sequence of Integers within a specified range.
* <p>
* <img width="640" height="195" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/range.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code range} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param start
* the value of the first Integer in the sequence
* @param count
* the number of sequential Integers to generate
* @return an Observable that emits a range of sequential Integers
* @throws IllegalArgumentException
* if {@code count} is less than zero, or if {@code start} + {@code count} − 1 exceeds
* {@code Integer.MAX_VALUE}
* @see <a href="http://reactivex.io/documentation/operators/range.html">ReactiveX operators documentation: Range</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Observable<Integer> range(final int start, final int count) {
if (count < 0) {
throw new IllegalArgumentException("count >= 0 required but it was " + count);
}
if (count == 0) {
return empty();
}
if (count == 1) {
return just(start);
}
if ((long)start + (count - 1) > Integer.MAX_VALUE) {
throw new IllegalArgumentException("Integer overflow");
}
return RxJavaPlugins.onAssembly(new ObservableRange(start, count));
}
/**
* Returns an Observable that emits a sequence of Longs within a specified range.
* <p>
* <img width="640" height="195" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/range.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code rangeLong} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param start
* the value of the first Long in the sequence
* @param count
* the number of sequential Longs to generate
* @return an Observable that emits a range of sequential Longs
* @throws IllegalArgumentException
* if {@code count} is less than zero, or if {@code start} + {@code count} − 1 exceeds
* {@code Long.MAX_VALUE}
* @see <a href="http://reactivex.io/documentation/operators/range.html">ReactiveX operators documentation: Range</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static Observable<Long> rangeLong(long start, long count) {
if (count < 0) {
throw new IllegalArgumentException("count >= 0 required but it was " + count);
}
if (count == 0) {
return empty();
}
if (count == 1) {
return just(start);
}
long end = start + (count - 1);
if (start > 0 && end < 0) {
throw new IllegalArgumentException("Overflow! start + count is bigger than Long.MAX_VALUE");
}
return RxJavaPlugins.onAssembly(new ObservableRangeLong(start, count));
}
/**
* Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the
* same by comparing the items emitted by each ObservableSource pairwise.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sequenceEqual.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sequenceEqual} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param source1
* the first ObservableSource to compare
* @param source2
* the second ObservableSource to compare
* @param <T>
* the type of items emitted by each ObservableSource
* @return a Single that emits a Boolean value that indicates whether the two sequences are the same
* @see <a href="http://reactivex.io/documentation/operators/sequenceequal.html">ReactiveX operators documentation: SequenceEqual</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2) {
return sequenceEqual(source1, source2, ObjectHelper.equalsPredicate(), bufferSize());
}
/**
* Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the
* same by comparing the items emitted by each ObservableSource pairwise based on the results of a specified
* equality function.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sequenceEqual.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sequenceEqual} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param source1
* the first ObservableSource to compare
* @param source2
* the second ObservableSource to compare
* @param isEqual
* a function used to compare items emitted by each ObservableSource
* @param <T>
* the type of items emitted by each ObservableSource
* @return a Single that emits a Boolean value that indicates whether the two ObservableSource two sequences
* are the same according to the specified function
* @see <a href="http://reactivex.io/documentation/operators/sequenceequal.html">ReactiveX operators documentation: SequenceEqual</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
BiPredicate<? super T, ? super T> isEqual) {
return sequenceEqual(source1, source2, isEqual, bufferSize());
}
/**
* Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the
* same by comparing the items emitted by each ObservableSource pairwise based on the results of a specified
* equality function.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sequenceEqual.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sequenceEqual} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param source1
* the first ObservableSource to compare
* @param source2
* the second ObservableSource to compare
* @param isEqual
* a function used to compare items emitted by each ObservableSource
* @param bufferSize
* the number of items to prefetch from the first and second source ObservableSource
* @param <T>
* the type of items emitted by each ObservableSource
* @return an Observable that emits a Boolean value that indicates whether the two ObservableSource two sequences
* are the same according to the specified function
* @see <a href="http://reactivex.io/documentation/operators/sequenceequal.html">ReactiveX operators documentation: SequenceEqual</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
BiPredicate<? super T, ? super T> isEqual, int bufferSize) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(isEqual, "isEqual is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableSequenceEqualSingle<T>(source1, source2, isEqual, bufferSize));
}
/**
* Returns a Single that emits a Boolean value that indicates whether two ObservableSource sequences are the
* same by comparing the items emitted by each ObservableSource pairwise.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sequenceEqual.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sequenceEqual} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param source1
* the first ObservableSource to compare
* @param source2
* the second ObservableSource to compare
* @param bufferSize
* the number of items to prefetch from the first and second source ObservableSource
* @param <T>
* the type of items emitted by each ObservableSource
* @return a Single that emits a Boolean value that indicates whether the two sequences are the same
* @see <a href="http://reactivex.io/documentation/operators/sequenceequal.html">ReactiveX operators documentation: SequenceEqual</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Single<Boolean> sequenceEqual(ObservableSource<? extends T> source1, ObservableSource<? extends T> source2,
int bufferSize) {
return sequenceEqual(source1, source2, ObjectHelper.equalsPredicate(), bufferSize);
}
/**
* Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the
* most recently emitted of those ObservableSources.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchDo.png" alt="">
* <p>
* {@code switchOnNext} subscribes to an ObservableSource that emits ObservableSources. Each time it observes one of
* these emitted ObservableSources, the ObservableSource returned by {@code switchOnNext} begins emitting the items
* emitted by that ObservableSource. When a new ObservableSource is emitted, {@code switchOnNext} stops emitting items
* from the earlier-emitted ObservableSource and begins emitting items from the new one.
* <p>
* The resulting ObservableSource completes if both the outer ObservableSource and the last inner ObservableSource, if any, complete.
* If the outer ObservableSource signals an onError, the inner ObservableSource is disposed and the error delivered in-sequence.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchOnNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the item type
* @param sources
* the source ObservableSource that emits ObservableSources
* @param bufferSize
* the number of items to prefetch from the inner ObservableSources
* @return an Observable that emits the items emitted by the ObservableSource most recently emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/switch.html">ReactiveX operators documentation: Switch</a>
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> switchOnNext(ObservableSource<? extends ObservableSource<? extends T>> sources, int bufferSize) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableSwitchMap(sources, Functions.identity(), bufferSize, false));
}
/**
* Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the
* most recently emitted of those ObservableSources.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchDo.png" alt="">
* <p>
* {@code switchOnNext} subscribes to an ObservableSource that emits ObservableSources. Each time it observes one of
* these emitted ObservableSources, the ObservableSource returned by {@code switchOnNext} begins emitting the items
* emitted by that ObservableSource. When a new ObservableSource is emitted, {@code switchOnNext} stops emitting items
* from the earlier-emitted ObservableSource and begins emitting items from the new one.
* <p>
* The resulting ObservableSource completes if both the outer ObservableSource and the last inner ObservableSource, if any, complete.
* If the outer ObservableSource signals an onError, the inner ObservableSource is disposed and the error delivered in-sequence.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchOnNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the item type
* @param sources
* the source ObservableSource that emits ObservableSources
* @return an Observable that emits the items emitted by the ObservableSource most recently emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/switch.html">ReactiveX operators documentation: Switch</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> switchOnNext(ObservableSource<? extends ObservableSource<? extends T>> sources) {
return switchOnNext(sources, bufferSize());
}
/**
* Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the
* most recently emitted of those ObservableSources and delays any exception until all ObservableSources terminate.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchDo.png" alt="">
* <p>
* {@code switchOnNext} subscribes to an ObservableSource that emits ObservableSources. Each time it observes one of
* these emitted ObservableSources, the ObservableSource returned by {@code switchOnNext} begins emitting the items
* emitted by that ObservableSource. When a new ObservableSource is emitted, {@code switchOnNext} stops emitting items
* from the earlier-emitted ObservableSource and begins emitting items from the new one.
* <p>
* The resulting ObservableSource completes if both the main ObservableSource and the last inner ObservableSource, if any, complete.
* If the main ObservableSource signals an onError, the termination of the last inner ObservableSource will emit that error as is
* or wrapped into a CompositeException along with the other possible errors the former inner ObservableSources signalled.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchOnNextDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the item type
* @param sources
* the source ObservableSource that emits ObservableSources
* @return an Observable that emits the items emitted by the ObservableSource most recently emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/switch.html">ReactiveX operators documentation: Switch</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> switchOnNextDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources) {
return switchOnNextDelayError(sources, bufferSize());
}
/**
* Converts an ObservableSource that emits ObservableSources into an ObservableSource that emits the items emitted by the
* most recently emitted of those ObservableSources and delays any exception until all ObservableSources terminate.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchDo.png" alt="">
* <p>
* {@code switchOnNext} subscribes to an ObservableSource that emits ObservableSources. Each time it observes one of
* these emitted ObservableSources, the ObservableSource returned by {@code switchOnNext} begins emitting the items
* emitted by that ObservableSource. When a new ObservableSource is emitted, {@code switchOnNext} stops emitting items
* from the earlier-emitted ObservableSource and begins emitting items from the new one.
* <p>
* The resulting ObservableSource completes if both the main ObservableSource and the last inner ObservableSource, if any, complete.
* If the main ObservableSource signals an onError, the termination of the last inner ObservableSource will emit that error as is
* or wrapped into a CompositeException along with the other possible errors the former inner ObservableSources signalled.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchOnNextDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the item type
* @param sources
* the source ObservableSource that emits ObservableSources
* @param prefetch
* the number of items to prefetch from the inner ObservableSources
* @return an Observable that emits the items emitted by the ObservableSource most recently emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/switch.html">ReactiveX operators documentation: Switch</a>
* @since 2.0
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> switchOnNextDelayError(ObservableSource<? extends ObservableSource<? extends T>> sources, int prefetch) {
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(prefetch, "prefetch");
return RxJavaPlugins.onAssembly(new ObservableSwitchMap(sources, Functions.identity(), prefetch, true));
}
/**
* Returns an Observable that emits {@code 0L} after a specified delay, and then completes.
* <p>
* <img width="640" height="200" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timer.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timer} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param delay
* the initial delay before emitting a single {@code 0L}
* @param unit
* time units to use for {@code delay}
* @return an Observable that {@code 0L} after a specified delay, and then completes
* @see <a href="http://reactivex.io/documentation/operators/timer.html">ReactiveX operators documentation: Timer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public static Observable<Long> timer(long delay, TimeUnit unit) {
return timer(delay, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits {@code 0L} after a specified delay, on a specified Scheduler, and then
* completes.
* <p>
* <img width="640" height="200" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timer.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param delay
* the initial delay before emitting a single 0L
* @param unit
* time units to use for {@code delay}
* @param scheduler
* the {@link Scheduler} to use for scheduling the item
* @throws NullPointerException
* if {@code unit} is null, or
* if {@code scheduler} is null
* @return an Observable that emits {@code 0L} after a specified delay, on a specified Scheduler, and then
* completes
* @see <a href="http://reactivex.io/documentation/operators/timer.html">ReactiveX operators documentation: Timer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public static Observable<Long> timer(long delay, TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableTimer(Math.max(delay, 0L), unit, scheduler));
}
/**
* Create an Observable by wrapping an ObservableSource <em>which has to be implemented according
* to the Reactive-Streams-based Observable specification by handling
* cancellation correctly; no safeguards are provided by the Observable itself</em>.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code unsafeCreate} by default doesn't operate on any particular {@link Scheduler}.</dd>
* </dl>
* @param <T> the value type emitted
* @param onSubscribe the ObservableSource instance to wrap
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> unsafeCreate(ObservableSource<T> onSubscribe) {
ObjectHelper.requireNonNull(onSubscribe, "source is null");
ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
if (onSubscribe instanceof Observable) {
throw new IllegalArgumentException("unsafeCreate(Observable) should be upgraded");
}
return RxJavaPlugins.onAssembly(new ObservableFromUnsafeSource<T>(onSubscribe));
}
/**
* Constructs an ObservableSource that creates a dependent resource object which is disposed of when the downstream
* calls dispose().
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/using.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code using} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the element type of the generated ObservableSource
* @param <D> the type of the resource associated with the output sequence
* @param resourceSupplier
* the factory function to create a resource object that depends on the ObservableSource
* @param sourceSupplier
* the factory function to create an ObservableSource
* @param disposer
* the function that will dispose of the resource
* @return the ObservableSource whose lifetime controls the lifetime of the dependent resource object
* @see <a href="http://reactivex.io/documentation/operators/using.html">ReactiveX operators documentation: Using</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, D> Observable<T> using(Callable<? extends D> resourceSupplier, Function<? super D, ? extends ObservableSource<? extends T>> sourceSupplier, Consumer<? super D> disposer) {
return using(resourceSupplier, sourceSupplier, disposer, true);
}
/**
* Constructs an ObservableSource that creates a dependent resource object which is disposed of just before
* termination if you have set {@code disposeEagerly} to {@code true} and a dispose() call does not occur
* before termination. Otherwise resource disposal will occur on a dispose() call. Eager disposal is
* particularly appropriate for a synchronous ObservableSource that reuses resources. {@code disposeAction} will
* only be called once per subscription.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/using.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code using} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the element type of the generated ObservableSource
* @param <D> the type of the resource associated with the output sequence
* @param resourceSupplier
* the factory function to create a resource object that depends on the ObservableSource
* @param sourceSupplier
* the factory function to create an ObservableSource
* @param disposer
* the function that will dispose of the resource
* @param eager
* if {@code true} then disposal will happen either on a dispose() call or just before emission of
* a terminal event ({@code onComplete} or {@code onError}).
* @return the ObservableSource whose lifetime controls the lifetime of the dependent resource object
* @see <a href="http://reactivex.io/documentation/operators/using.html">ReactiveX operators documentation: Using</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, D> Observable<T> using(Callable<? extends D> resourceSupplier, Function<? super D, ? extends ObservableSource<? extends T>> sourceSupplier, Consumer<? super D> disposer, boolean eager) {
ObjectHelper.requireNonNull(resourceSupplier, "resourceSupplier is null");
ObjectHelper.requireNonNull(sourceSupplier, "sourceSupplier is null");
ObjectHelper.requireNonNull(disposer, "disposer is null");
return RxJavaPlugins.onAssembly(new ObservableUsing<T, D>(resourceSupplier, sourceSupplier, disposer, eager));
}
/**
* Wraps an ObservableSource into an Observable if not already an Observable.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code wrap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the value type
* @param source the source ObservableSource instance
* @return the new Observable instance or the same as the source
* @throws NullPointerException if source is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T> Observable<T> wrap(ObservableSource<T> source) {
ObjectHelper.requireNonNull(source, "source is null");
if (source instanceof Observable) {
return RxJavaPlugins.onAssembly((Observable<T>)source);
}
return RxJavaPlugins.onAssembly(new ObservableFromUnsafeSource<T>(source));
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* items emitted, in sequence, by an Iterable of other ObservableSources.
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each of the source ObservableSources;
* the second item emitted by the new ObservableSource will be the result of the function applied to the second
* item emitted by each of those ObservableSources; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@code onNext} as many times as
* the number of {@code onNext} invocations of the source ObservableSource that emits the fewest items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(Arrays.asList(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2)), (a) -> a)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
*
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common value type
* @param <R> the zipped result type
* @param sources
* an Iterable of source ObservableSources
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> zip(Iterable<? extends ObservableSource<? extends T>> sources, Function<? super Object[], ? extends R> zipper) {
ObjectHelper.requireNonNull(zipper, "zipper is null");
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new ObservableZip<T, R>(null, sources, zipper, bufferSize(), false));
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* <i>n</i> items emitted, in sequence, by the <i>n</i> ObservableSources emitted by a specified ObservableSource.
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each of the ObservableSources emitted
* by the source ObservableSource; the second item emitted by the new ObservableSource will be the result of the
* function applied to the second item emitted by each of those ObservableSources; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@code onNext} as many times as
* the number of {@code onNext} invocations of the source ObservableSource that emits the fewest items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(just(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2)), (a) -> a)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
*
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.o.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the value type of the inner ObservableSources
* @param <R> the zipped result type
* @param sources
* an ObservableSource of source ObservableSources
* @param zipper
* a function that, when applied to an item emitted by each of the ObservableSources emitted by
* {@code ws}, results in an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> zip(ObservableSource<? extends ObservableSource<? extends T>> sources, final Function<? super Object[], ? extends R> zipper) {
ObjectHelper.requireNonNull(zipper, "zipper is null");
ObjectHelper.requireNonNull(sources, "sources is null");
return RxJavaPlugins.onAssembly(new ObservableToList(sources, 16)
.flatMap(ObservableInternalHelper.zipIterable(zipper)));
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* two items emitted, in sequence, by two other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by {@code o1} and the first item
* emitted by {@code o2}; the second item emitted by the new ObservableSource will be the result of the function
* applied to the second item emitted by {@code o1} and the second item emitted by {@code o2}; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), (a, b) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results
* in an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
BiFunction<? super T1, ? super T2, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* two items emitted, in sequence, by two other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by {@code o1} and the first item
* emitted by {@code o2}; the second item emitted by the new ObservableSource will be the result of the function
* applied to the second item emitted by {@code o1} and the second item emitted by {@code o2}; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), (a, b) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results
* in an item that will be emitted by the resulting ObservableSource
* @param delayError delay errors from any of the source ObservableSources till the other terminates
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return zipArray(Functions.toFunction(zipper), delayError, bufferSize(), source1, source2);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* two items emitted, in sequence, by two other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by {@code o1} and the first item
* emitted by {@code o2}; the second item emitted by the new ObservableSource will be the result of the function
* applied to the second item emitted by {@code o1} and the second item emitted by {@code o2}; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), (a, b) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results
* in an item that will be emitted by the resulting ObservableSource
* @param delayError delay errors from any of the source ObservableSources till the other terminates
* @param bufferSize the number of elements to prefetch from each source ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2,
BiFunction<? super T1, ? super T2, ? extends R> zipper, boolean delayError, int bufferSize) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
return zipArray(Functions.toFunction(zipper), delayError, bufferSize, source1, source2);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* three items emitted, in sequence, by three other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by {@code o1}, the first item
* emitted by {@code o2}, and the first item emitted by {@code o3}; the second item emitted by the new
* ObservableSource will be the result of the function applied to the second item emitted by {@code o1}, the
* second item emitted by {@code o2}, and the second item emitted by {@code o3}; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
Function3<? super T1, ? super T2, ? super T3, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* four items emitted, in sequence, by four other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by {@code o1}, the first item
* emitted by {@code o2}, the first item emitted by {@code o3}, and the first item emitted by {@code 04};
* the second item emitted by the new ObservableSource will be the result of the function applied to the second
* item emitted by each of those ObservableSources; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c, d) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <T4> the value type of the fourth source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param source4
* a fourth source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
ObservableSource<? extends T4> source4,
Function4<? super T1, ? super T2, ? super T3, ? super T4, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* five items emitted, in sequence, by five other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by {@code o1}, the first item
* emitted by {@code o2}, the first item emitted by {@code o3}, the first item emitted by {@code o4}, and
* the first item emitted by {@code o5}; the second item emitted by the new ObservableSource will be the result of
* the function applied to the second item emitted by each of those ObservableSources; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c, d, e) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <T4> the value type of the fourth source
* @param <T5> the value type of the fifth source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param source4
* a fourth source ObservableSource
* @param source5
* a fifth source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5,
Function5<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* six items emitted, in sequence, by six other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each source ObservableSource, the
* second item emitted by the new ObservableSource will be the result of the function applied to the second item
* emitted by each of those ObservableSources, and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c, d, e, f) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <T4> the value type of the fourth source
* @param <T5> the value type of the fifth source
* @param <T6> the value type of the sixth source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param source4
* a fourth source ObservableSource
* @param source5
* a fifth source ObservableSource
* @param source6
* a sixth source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
Function6<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* seven items emitted, in sequence, by seven other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each source ObservableSource, the
* second item emitted by the new ObservableSource will be the result of the function applied to the second item
* emitted by each of those ObservableSources, and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c, d, e, f, g) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <T4> the value type of the fourth source
* @param <T5> the value type of the fifth source
* @param <T6> the value type of the sixth source
* @param <T7> the value type of the seventh source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param source4
* a fourth source ObservableSource
* @param source5
* a fifth source ObservableSource
* @param source6
* a sixth source ObservableSource
* @param source7
* a seventh source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, T7, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
ObservableSource<? extends T7> source7,
Function7<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
ObjectHelper.requireNonNull(source7, "source7 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* eight items emitted, in sequence, by eight other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each source ObservableSource, the
* second item emitted by the new ObservableSource will be the result of the function applied to the second item
* emitted by each of those ObservableSources, and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c, d, e, f, g, h) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <T4> the value type of the fourth source
* @param <T5> the value type of the fifth source
* @param <T6> the value type of the sixth source
* @param <T7> the value type of the seventh source
* @param <T8> the value type of the eighth source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param source4
* a fourth source ObservableSource
* @param source5
* a fifth source ObservableSource
* @param source6
* a sixth source ObservableSource
* @param source7
* a seventh source ObservableSource
* @param source8
* an eighth source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, T7, T8, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8,
Function8<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
ObjectHelper.requireNonNull(source7, "source7 is null");
ObjectHelper.requireNonNull(source8, "source8 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* nine items emitted, in sequence, by nine other ObservableSources.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each source ObservableSource, the
* second item emitted by the new ObservableSource will be the result of the function applied to the second item
* emitted by each of those ObservableSources, and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@link Observer#onNext onNext}
* as many times as the number of {@code onNext} invocations of the source ObservableSource that emits the fewest
* items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2), ..., (a, b, c, d, e, f, g, h, i) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the value type of the first source
* @param <T2> the value type of the second source
* @param <T3> the value type of the third source
* @param <T4> the value type of the fourth source
* @param <T5> the value type of the fifth source
* @param <T6> the value type of the sixth source
* @param <T7> the value type of the seventh source
* @param <T8> the value type of the eighth source
* @param <T9> the value type of the ninth source
* @param <R> the zipped result type
* @param source1
* the first source ObservableSource
* @param source2
* a second source ObservableSource
* @param source3
* a third source ObservableSource
* @param source4
* a fourth source ObservableSource
* @param source5
* a fifth source ObservableSource
* @param source6
* a sixth source ObservableSource
* @param source7
* a seventh source ObservableSource
* @param source8
* an eighth source ObservableSource
* @param source9
* a ninth source ObservableSource
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T1, T2, T3, T4, T5, T6, T7, T8, T9, R> Observable<R> zip(
ObservableSource<? extends T1> source1, ObservableSource<? extends T2> source2, ObservableSource<? extends T3> source3,
ObservableSource<? extends T4> source4, ObservableSource<? extends T5> source5, ObservableSource<? extends T6> source6,
ObservableSource<? extends T7> source7, ObservableSource<? extends T8> source8, ObservableSource<? extends T9> source9,
Function9<? super T1, ? super T2, ? super T3, ? super T4, ? super T5, ? super T6, ? super T7, ? super T8, ? super T9, ? extends R> zipper) {
ObjectHelper.requireNonNull(source1, "source1 is null");
ObjectHelper.requireNonNull(source2, "source2 is null");
ObjectHelper.requireNonNull(source3, "source3 is null");
ObjectHelper.requireNonNull(source4, "source4 is null");
ObjectHelper.requireNonNull(source5, "source5 is null");
ObjectHelper.requireNonNull(source6, "source6 is null");
ObjectHelper.requireNonNull(source7, "source7 is null");
ObjectHelper.requireNonNull(source8, "source8 is null");
ObjectHelper.requireNonNull(source9, "source9 is null");
return zipArray(Functions.toFunction(zipper), false, bufferSize(), source1, source2, source3, source4, source5, source6, source7, source8, source9);
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* items emitted, in sequence, by an array of other ObservableSources.
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each of the source ObservableSources;
* the second item emitted by the new ObservableSource will be the result of the function applied to the second
* item emitted by each of those ObservableSources; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@code onNext} as many times as
* the number of {@code onNext} invocations of the source ObservableSource that emits the fewest items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(new ObservableSource[]{range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2)}, (a) ->
* a)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
*
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zipArray.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zipArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T> the common element type
* @param <R> the result type
* @param sources
* an array of source ObservableSources
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @param delayError
* delay errors signalled by any of the source ObservableSource until all ObservableSources terminate
* @param bufferSize
* the number of elements to prefetch from each source ObservableSource
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> zipArray(Function<? super Object[], ? extends R> zipper,
boolean delayError, int bufferSize, ObservableSource<? extends T>... sources) {
if (sources.length == 0) {
return empty();
}
ObjectHelper.requireNonNull(zipper, "zipper is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableZip<T, R>(sources, null, zipper, bufferSize, delayError));
}
/**
* Returns an Observable that emits the results of a specified combiner function applied to combinations of
* items emitted, in sequence, by an Iterable of other ObservableSources.
* <p>
* {@code zip} applies this function in strict sequence, so the first item emitted by the new ObservableSource
* will be the result of the function applied to the first item emitted by each of the source ObservableSources;
* the second item emitted by the new ObservableSource will be the result of the function applied to the second
* item emitted by each of those ObservableSources; and so forth.
* <p>
* The resulting {@code ObservableSource<R>} returned from {@code zip} will invoke {@code onNext} as many times as
* the number of {@code onNext} invocations of the source ObservableSource that emits the fewest items.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>zip(Arrays.asList(range(1, 5).doOnComplete(action1), range(6, 5).doOnComplete(action2)), (a) -> a)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
* <p>
* Note on method signature: since Java doesn't allow creating a generic array with {@code new T[]}, the
* implementation of this operator has to create an {@code Object[]} instead. Unfortunately, a
* {@code Function<Integer[], R>} passed to the method would trigger a {@code ClassCastException}.
*
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zipIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
*
* @param sources
* an Iterable of source ObservableSources
* @param zipper
* a function that, when applied to an item emitted by each of the source ObservableSources, results in
* an item that will be emitted by the resulting ObservableSource
* @param delayError
* delay errors signalled by any of the source ObservableSource until all ObservableSources terminate
* @param bufferSize
* the number of elements to prefetch from each source ObservableSource
* @param <T> the common source value type
* @param <R> the zipped result type
* @return an Observable that emits the zipped results
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public static <T, R> Observable<R> zipIterable(Iterable<? extends ObservableSource<? extends T>> sources,
Function<? super Object[], ? extends R> zipper, boolean delayError,
int bufferSize) {
ObjectHelper.requireNonNull(zipper, "zipper is null");
ObjectHelper.requireNonNull(sources, "sources is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableZip<T, R>(null, sources, zipper, bufferSize, delayError));
}
// ***************************************************************************************************
// Instance operators
// ***************************************************************************************************
/**
* Returns an Observable that emits a Boolean that indicates whether all of the items emitted by the source
* ObservableSource satisfy a condition.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/all.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code all} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate
* a function that evaluates an item and returns a Boolean
* @return a Single that emits {@code true} if all items emitted by the source ObservableSource satisfy the
* predicate; otherwise, {@code false}
* @see <a href="http://reactivex.io/documentation/operators/all.html">ReactiveX operators documentation: All</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<Boolean> all(Predicate<? super T> predicate) {
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableAllSingle<T>(this, predicate));
}
/**
* Mirrors the ObservableSource (current or provided) that first either emits an item or sends a termination
* notification.
* <p>
* <img width="640" height="385" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/amb.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code ambWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param other
* an ObservableSource competing to react first. A subscription to this provided source will occur after
* subscribing to the current source.
* @return an Observable that emits the same sequence as whichever of the source ObservableSources first
* emitted an item or sent a termination notification
* @see <a href="http://reactivex.io/documentation/operators/amb.html">ReactiveX operators documentation: Amb</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> ambWith(ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return ambArray(this, other);
}
/**
* Returns an Observable that emits {@code true} if any item emitted by the source ObservableSource satisfies a
* specified condition, otherwise {@code false}. <em>Note:</em> this always emits {@code false} if the
* source ObservableSource is empty.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/any.2.png" alt="">
* <p>
* In Rx.Net this is the {@code any} Observer but we renamed it in RxJava to better match Java naming
* idioms.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code any} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate
* the condition to test items emitted by the source ObservableSource
* @return a Single that emits a Boolean that indicates whether any item emitted by the source
* ObservableSource satisfies the {@code predicate}
* @see <a href="http://reactivex.io/documentation/operators/contains.html">ReactiveX operators documentation: Contains</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<Boolean> any(Predicate<? super T> predicate) {
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableAnySingle<T>(this, predicate));
}
/**
* Returns the first item emitted by this {@code Observable}, or throws
* {@code NoSuchElementException} if it emits no items.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingFirst} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the first item emitted by this {@code Observable}
* @throws NoSuchElementException
* if this {@code Observable} emits no items
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final T blockingFirst() {
BlockingFirstObserver<T> s = new BlockingFirstObserver<T>();
subscribe(s);
T v = s.blockingGet();
if (v != null) {
return v;
}
throw new NoSuchElementException();
}
/**
* Returns the first item emitted by this {@code Observable}, or a default value if it emits no
* items.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingFirst} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* a default value to return if this {@code Observable} emits no items
* @return the first item emitted by this {@code Observable}, or the default value if it emits no
* items
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final T blockingFirst(T defaultItem) {
BlockingFirstObserver<T> s = new BlockingFirstObserver<T>();
subscribe(s);
T v = s.blockingGet();
return v != null ? v : defaultItem;
}
/**
* Invokes a method on each item emitted by this {@code Observable} and blocks until the Observable
* completes.
* <p>
* <em>Note:</em> This will block even if the underlying Observable is asynchronous.
* <p>
* <img width="640" height="330" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.forEach.png" alt="">
* <p>
* This is similar to {@link Observable#subscribe(Observer)}, but it blocks. Because it blocks it does not
* need the {@link Observer#onComplete()} or {@link Observer#onError(Throwable)} methods. If the
* underlying Observable terminates with an error, rather than calling {@code onError}, this method will
* throw an exception.
*
* <p>The difference between this method and {@link #subscribe(Consumer)} is that the {@code onNext} action
* is executed on the emission thread instead of the current thread.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingForEach} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* the {@link Consumer} to invoke for each item emitted by the {@code Observable}
* @throws RuntimeException
* if an error occurs
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX documentation: Subscribe</a>
* @see #subscribe(Consumer)
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void blockingForEach(Consumer<? super T> onNext) {
Iterator<T> it = blockingIterable().iterator();
while (it.hasNext()) {
try {
onNext.accept(it.next());
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
((Disposable)it).dispose();
throw ExceptionHelper.wrapOrThrow(e);
}
}
}
/**
* Converts this {@code Observable} into an {@link Iterable}.
* <p>
* <img width="640" height="315" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.toIterable.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an {@link Iterable} version of this {@code Observable}
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Iterable<T> blockingIterable() {
return blockingIterable(bufferSize());
}
/**
* Converts this {@code Observable} into an {@link Iterable}.
* <p>
* <img width="640" height="315" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.toIterable.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param bufferSize the number of items to prefetch from the current Observable
* @return an {@link Iterable} version of this {@code Observable}
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Iterable<T> blockingIterable(int bufferSize) {
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return new BlockingObservableIterable<T>(this, bufferSize);
}
/**
* Returns the last item emitted by this {@code Observable}, or throws
* {@code NoSuchElementException} if this {@code Observable} emits no items.
* <p>
* <img width="640" height="315" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.last.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingLast} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the last item emitted by this {@code Observable}
* @throws NoSuchElementException
* if this {@code Observable} emits no items
* @see <a href="http://reactivex.io/documentation/operators/last.html">ReactiveX documentation: Last</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final T blockingLast() {
BlockingLastObserver<T> s = new BlockingLastObserver<T>();
subscribe(s);
T v = s.blockingGet();
if (v != null) {
return v;
}
throw new NoSuchElementException();
}
/**
* Returns the last item emitted by this {@code Observable}, or a default value if it emits no
* items.
* <p>
* <img width="640" height="310" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.lastOrDefault.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingLast} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* a default value to return if this {@code Observable} emits no items
* @return the last item emitted by the {@code Observable}, or the default value if it emits no
* items
* @see <a href="http://reactivex.io/documentation/operators/last.html">ReactiveX documentation: Last</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final T blockingLast(T defaultItem) {
BlockingLastObserver<T> s = new BlockingLastObserver<T>();
subscribe(s);
T v = s.blockingGet();
return v != null ? v : defaultItem;
}
/**
* Returns an {@link Iterable} that returns the latest item emitted by this {@code Observable},
* waiting if necessary for one to become available.
* <p>
* If this {@code Observable} produces items faster than {@code Iterator.next} takes them,
* {@code onNext} events might be skipped, but {@code onError} or {@code onComplete} events are not.
* <p>
* Note also that an {@code onNext} directly followed by {@code onComplete} might hide the {@code onNext}
* event.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingLatest} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an Iterable that always returns the latest item emitted by this {@code Observable}
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Iterable<T> blockingLatest() {
return new BlockingObservableLatest<T>(this);
}
/**
* Returns an {@link Iterable} that always returns the item most recently emitted by this
* {@code Observable}.
* <p>
* <img width="640" height="490" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.mostRecent.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingMostRecent} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param initialValue
* the initial value that the {@link Iterable} sequence will yield if this
* {@code Observable} has not yet emitted an item
* @return an {@link Iterable} that on each iteration returns the item that this {@code Observable}
* has most recently emitted
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Iterable<T> blockingMostRecent(T initialValue) {
return new BlockingObservableMostRecent<T>(this, initialValue);
}
/**
* Returns an {@link Iterable} that blocks until this {@code Observable} emits another item, then
* returns that item.
* <p>
* <img width="640" height="490" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.next.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an {@link Iterable} that blocks upon each iteration until this {@code Observable} emits
* a new item, whereupon the Iterable returns that item
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Iterable<T> blockingNext() {
return new BlockingObservableNext<T>(this);
}
/**
* If this {@code Observable} completes after emitting a single item, return that item, otherwise
* throw a {@code NoSuchElementException}.
* <p>
* <img width="640" height="315" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.single.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSingle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the single item emitted by this {@code Observable}
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final T blockingSingle() {
T v = singleElement().blockingGet();
if (v == null) {
throw new NoSuchElementException();
}
return v;
}
/**
* If this {@code Observable} completes after emitting a single item, return that item; if it emits
* more than one item, throw an {@code IllegalArgumentException}; if it emits no items, return a default
* value.
* <p>
* <img width="640" height="315" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.singleOrDefault.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSingle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* a default value to return if this {@code Observable} emits no items
* @return the single item emitted by this {@code Observable}, or the default value if it emits no
* items
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final T blockingSingle(T defaultItem) {
return single(defaultItem).blockingGet();
}
/**
* Returns a {@link Future} representing the single value emitted by this {@code Observable}.
* <p>
* If the {@link Observable} emits more than one item, {@link java.util.concurrent.Future} will receive an
* {@link java.lang.IllegalArgumentException}. If the {@link Observable} is empty, {@link java.util.concurrent.Future}
* will receive an {@link java.util.NoSuchElementException}.
* <p>
* If the {@code Observable} may emit more than one item, use {@code Observable.toList().toBlocking().toFuture()}.
* <p>
* <img width="640" height="395" src="https://github.com/ReactiveX/RxJava/wiki/images/rx-operators/B.toFuture.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toFuture} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a {@link Future} that expects a single item to be emitted by this {@code Observable}
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Future<T> toFuture() {
return subscribeWith(new FutureObserver<T>());
}
/**
* Runs the source observable to a terminal event, ignoring any values and rethrowing any exception.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @since 2.0
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void blockingSubscribe() {
ObservableBlockingSubscribe.subscribe(this);
}
/**
* Subscribes to the source and calls the given callbacks <strong>on the current thread</strong>.
* <p>
* If the Observable emits an error, it is wrapped into an
* {@link io.reactivex.exceptions.OnErrorNotImplementedException OnErrorNotImplementedException}
* and routed to the RxJavaPlugins.onError handler.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param onNext the callback action for each source value
* @since 2.0
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void blockingSubscribe(Consumer<? super T> onNext) {
ObservableBlockingSubscribe.subscribe(this, onNext, Functions.ON_ERROR_MISSING, Functions.EMPTY_ACTION);
}
/**
* Subscribes to the source and calls the given callbacks <strong>on the current thread</strong>.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param onNext the callback action for each source value
* @param onError the callback action for an error event
* @since 2.0
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void blockingSubscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError) {
ObservableBlockingSubscribe.subscribe(this, onNext, onError, Functions.EMPTY_ACTION);
}
/**
* Subscribes to the source and calls the given callbacks <strong>on the current thread</strong>.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param onNext the callback action for each source value
* @param onError the callback action for an error event
* @param onComplete the callback action for the completion event.
* @since 2.0
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void blockingSubscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete) {
ObservableBlockingSubscribe.subscribe(this, onNext, onError, onComplete);
}
/**
* Subscribes to the source and calls the Observer methods <strong>on the current thread</strong>.
* <p>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code blockingSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* The a dispose() call is composed through.
* @param subscriber the subscriber to forward events and calls to in the current thread
* @since 2.0
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void blockingSubscribe(Observer<? super T> subscriber) {
ObservableBlockingSubscribe.subscribe(this, subscriber);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each containing {@code count} items. When the source
* ObservableSource completes or encounters an error, the resulting ObservableSource emits the current buffer and
* propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer3.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum number of items in each buffer before it should be emitted
* @return an Observable that emits connected, non-overlapping buffers, each containing at most
* {@code count} items from the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<List<T>> buffer(int count) {
return buffer(count, count);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits buffers every {@code skip} items, each containing {@code count} items. When the source
* ObservableSource completes or encounters an error, the resulting ObservableSource emits the current buffer and
* propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer4.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum size of each buffer before it should be emitted
* @param skip
* how many items emitted by the source ObservableSource should be skipped before starting a new
* buffer. Note that when {@code skip} and {@code count} are equal, this is the same operation as
* {@link #buffer(int)}.
* @return an Observable that emits buffers for every {@code skip} item from the source ObservableSource and
* containing at most {@code count} items
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<List<T>> buffer(int count, int skip) {
return buffer(count, skip, ArrayListSupplier.<T>asCallable());
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits buffers every {@code skip} items, each containing {@code count} items. When the source
* ObservableSource completes or encounters an error, the resulting ObservableSource emits the current buffer and
* propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer4.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param count
* the maximum size of each buffer before it should be emitted
* @param skip
* how many items emitted by the source ObservableSource should be skipped before starting a new
* buffer. Note that when {@code skip} and {@code count} are equal, this is the same operation as
* {@link #buffer(int)}.
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @return an Observable that emits buffers for every {@code skip} item from the source ObservableSource and
* containing at most {@code count} items
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U extends Collection<? super T>> Observable<U> buffer(int count, int skip, Callable<U> bufferSupplier) {
ObjectHelper.verifyPositive(count, "count");
ObjectHelper.verifyPositive(skip, "skip");
ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableBuffer<T, U>(this, count, skip, bufferSupplier));
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each containing {@code count} items. When the source
* ObservableSource completes or encounters an error, the resulting ObservableSource emits the current buffer and
* propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer3.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param count
* the maximum number of items in each buffer before it should be emitted
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @return an Observable that emits connected, non-overlapping buffers, each containing at most
* {@code count} items from the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U extends Collection<? super T>> Observable<U> buffer(int count, Callable<U> bufferSupplier) {
return buffer(count, count, bufferSupplier);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource starts a new buffer periodically, as determined by the {@code timeskip} argument. It emits
* each buffer after a fixed timespan, specified by the {@code timespan} argument. When the source
* ObservableSource completes or encounters an error, the resulting ObservableSource emits the current buffer and
* propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer7.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each buffer collects items before it is emitted
* @param timeskip
* the period of time after which a new buffer will be created
* @param unit
* the unit of time that applies to the {@code timespan} and {@code timeskip} arguments
* @return an Observable that emits new buffers of items emitted by the source ObservableSource periodically after
* a fixed timespan has elapsed
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<List<T>> buffer(long timespan, long timeskip, TimeUnit unit) {
return buffer(timespan, timeskip, unit, Schedulers.computation(), ArrayListSupplier.<T>asCallable());
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource starts a new buffer periodically, as determined by the {@code timeskip} argument, and on the
* specified {@code scheduler}. It emits each buffer after a fixed timespan, specified by the
* {@code timespan} argument. When the source ObservableSource completes or encounters an error, the resulting
* ObservableSource emits the current buffer and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer7.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each buffer collects items before it is emitted
* @param timeskip
* the period of time after which a new buffer will be created
* @param unit
* the unit of time that applies to the {@code timespan} and {@code timeskip} arguments
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a buffer
* @return an Observable that emits new buffers of items emitted by the source ObservableSource periodically after
* a fixed timespan has elapsed
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<List<T>> buffer(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler) {
return buffer(timespan, timeskip, unit, scheduler, ArrayListSupplier.<T>asCallable());
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource starts a new buffer periodically, as determined by the {@code timeskip} argument, and on the
* specified {@code scheduler}. It emits each buffer after a fixed timespan, specified by the
* {@code timespan} argument. When the source ObservableSource completes or encounters an error, the resulting
* ObservableSource emits the current buffer and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer7.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param timespan
* the period of time each buffer collects items before it is emitted
* @param timeskip
* the period of time after which a new buffer will be created
* @param unit
* the unit of time that applies to the {@code timespan} and {@code timeskip} arguments
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a buffer
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @return an Observable that emits new buffers of items emitted by the source ObservableSource periodically after
* a fixed timespan has elapsed
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final <U extends Collection<? super T>> Observable<U> buffer(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, Callable<U> bufferSupplier) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableBufferTimed<T, U>(this, timespan, timeskip, unit, scheduler, bufferSupplier, Integer.MAX_VALUE, false));
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each of a fixed duration specified by the
* {@code timespan} argument. When the source ObservableSource completes or encounters an error, the resulting
* ObservableSource emits the current buffer and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer5.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each buffer collects items before it is emitted and replaced with a new
* buffer
* @param unit
* the unit of time that applies to the {@code timespan} argument
* @return an Observable that emits connected, non-overlapping buffers of items emitted by the source
* ObservableSource within a fixed duration
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<List<T>> buffer(long timespan, TimeUnit unit) {
return buffer(timespan, unit, Schedulers.computation(), Integer.MAX_VALUE);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each of a fixed duration specified by the
* {@code timespan} argument or a maximum size specified by the {@code count} argument (whichever is reached
* first). When the source ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current buffer and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer6.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each buffer collects items before it is emitted and replaced with a new
* buffer
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param count
* the maximum size of each buffer before it is emitted
* @return an Observable that emits connected, non-overlapping buffers of items emitted by the source
* ObservableSource, after a fixed duration or when the buffer reaches maximum capacity (whichever occurs
* first)
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<List<T>> buffer(long timespan, TimeUnit unit, int count) {
return buffer(timespan, unit, Schedulers.computation(), count);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each of a fixed duration specified by the
* {@code timespan} argument as measured on the specified {@code scheduler}, or a maximum size specified by
* the {@code count} argument (whichever is reached first). When the source ObservableSource completes or
* encounters an error, the resulting ObservableSource emits the current buffer and propagates the notification
* from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer6.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each buffer collects items before it is emitted and replaced with a new
* buffer
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a buffer
* @param count
* the maximum size of each buffer before it is emitted
* @return an Observable that emits connected, non-overlapping buffers of items emitted by the source
* ObservableSource after a fixed duration or when the buffer reaches maximum capacity (whichever occurs
* first)
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<List<T>> buffer(long timespan, TimeUnit unit, Scheduler scheduler, int count) {
return buffer(timespan, unit, scheduler, count, ArrayListSupplier.<T>asCallable(), false);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each of a fixed duration specified by the
* {@code timespan} argument as measured on the specified {@code scheduler}, or a maximum size specified by
* the {@code count} argument (whichever is reached first). When the source ObservableSource completes or
* encounters an error, the resulting ObservableSource emits the current buffer and propagates the notification
* from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer6.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param timespan
* the period of time each buffer collects items before it is emitted and replaced with a new
* buffer
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a buffer
* @param count
* the maximum size of each buffer before it is emitted
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @param restartTimerOnMaxSize if true the time window is restarted when the max capacity of the current buffer
* is reached
* @return an Observable that emits connected, non-overlapping buffers of items emitted by the source
* ObservableSource after a fixed duration or when the buffer reaches maximum capacity (whichever occurs
* first)
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final <U extends Collection<? super T>> Observable<U> buffer(
long timespan, TimeUnit unit,
Scheduler scheduler, int count,
Callable<U> bufferSupplier,
boolean restartTimerOnMaxSize) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
ObjectHelper.verifyPositive(count, "count");
return RxJavaPlugins.onAssembly(new ObservableBufferTimed<T, U>(this, timespan, timespan, unit, scheduler, bufferSupplier, count, restartTimerOnMaxSize));
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers, each of a fixed duration specified by the
* {@code timespan} argument and on the specified {@code scheduler}. When the source ObservableSource completes or
* encounters an error, the resulting ObservableSource emits the current buffer and propagates the notification
* from the source ObservableSource.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer5.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each buffer collects items before it is emitted and replaced with a new
* buffer
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a buffer
* @return an Observable that emits connected, non-overlapping buffers of items emitted by the source
* ObservableSource within a fixed duration
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<List<T>> buffer(long timespan, TimeUnit unit, Scheduler scheduler) {
return buffer(timespan, unit, scheduler, Integer.MAX_VALUE, ArrayListSupplier.<T>asCallable(), false);
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits buffers that it creates when the specified {@code openingIndicator} ObservableSource emits an
* item, and closes when the ObservableSource returned from {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="470" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <TOpening> the element type of the buffer-opening ObservableSource
* @param <TClosing> the element type of the individual buffer-closing ObservableSources
* @param openingIndicator
* the ObservableSource that, when it emits an item, causes a new buffer to be created
* @param closingIndicator
* the {@link Function} that is used to produce an ObservableSource for every buffer created. When this
* ObservableSource emits an item, the associated buffer is emitted.
* @return an Observable that emits buffers, containing items from the source ObservableSource, that are created
* and closed when the specified ObservableSources emit items
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <TOpening, TClosing> Observable<List<T>> buffer(
ObservableSource<? extends TOpening> openingIndicator,
Function<? super TOpening, ? extends ObservableSource<? extends TClosing>> closingIndicator) {
return buffer(openingIndicator, closingIndicator, ArrayListSupplier.<T>asCallable());
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits buffers that it creates when the specified {@code openingIndicator} ObservableSource emits an
* item, and closes when the ObservableSource returned from {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="470" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param <TOpening> the element type of the buffer-opening ObservableSource
* @param <TClosing> the element type of the individual buffer-closing ObservableSources
* @param openingIndicator
* the ObservableSource that, when it emits an item, causes a new buffer to be created
* @param closingIndicator
* the {@link Function} that is used to produce an ObservableSource for every buffer created. When this
* ObservableSource emits an item, the associated buffer is emitted.
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @return an Observable that emits buffers, containing items from the source ObservableSource, that are created
* and closed when the specified ObservableSources emit items
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <TOpening, TClosing, U extends Collection<? super T>> Observable<U> buffer(
ObservableSource<? extends TOpening> openingIndicator,
Function<? super TOpening, ? extends ObservableSource<? extends TClosing>> closingIndicator,
Callable<U> bufferSupplier) {
ObjectHelper.requireNonNull(openingIndicator, "openingIndicator is null");
ObjectHelper.requireNonNull(closingIndicator, "closingIndicator is null");
ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableBufferBoundary<T, U, TOpening, TClosing>(this, openingIndicator, closingIndicator, bufferSupplier));
}
/**
* Returns an Observable that emits non-overlapping buffered items from the source ObservableSource each time the
* specified boundary ObservableSource emits an item.
* <p>
* <img width="640" height="395" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer8.png" alt="">
* <p>
* Completion of either the source or the boundary ObservableSource causes the returned ObservableSource to emit the
* latest buffer and complete.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B>
* the boundary value type (ignored)
* @param boundary
* the boundary ObservableSource
* @return an Observable that emits buffered items from the source ObservableSource when the boundary ObservableSource
* emits an item
* @see #buffer(ObservableSource, int)
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<List<T>> buffer(ObservableSource<B> boundary) {
return buffer(boundary, ArrayListSupplier.<T>asCallable());
}
/**
* Returns an Observable that emits non-overlapping buffered items from the source ObservableSource each time the
* specified boundary ObservableSource emits an item.
* <p>
* <img width="640" height="395" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer8.png" alt="">
* <p>
* Completion of either the source or the boundary ObservableSource causes the returned ObservableSource to emit the
* latest buffer and complete.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B>
* the boundary value type (ignored)
* @param boundary
* the boundary ObservableSource
* @param initialCapacity
* the initial capacity of each buffer chunk
* @return an Observable that emits buffered items from the source ObservableSource when the boundary ObservableSource
* emits an item
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
* @see #buffer(ObservableSource)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<List<T>> buffer(ObservableSource<B> boundary, final int initialCapacity) {
ObjectHelper.verifyPositive(initialCapacity, "initialCapacity");
return buffer(boundary, Functions.<T>createArrayList(initialCapacity));
}
/**
* Returns an Observable that emits non-overlapping buffered items from the source ObservableSource each time the
* specified boundary ObservableSource emits an item.
* <p>
* <img width="640" height="395" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer8.png" alt="">
* <p>
* Completion of either the source or the boundary ObservableSource causes the returned ObservableSource to emit the
* latest buffer and complete.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param <B>
* the boundary value type (ignored)
* @param boundary
* the boundary ObservableSource
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @return an Observable that emits buffered items from the source ObservableSource when the boundary ObservableSource
* emits an item
* @see #buffer(ObservableSource, int)
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B, U extends Collection<? super T>> Observable<U> buffer(ObservableSource<B> boundary, Callable<U> bufferSupplier) {
ObjectHelper.requireNonNull(boundary, "boundary is null");
ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableBufferExactBoundary<T, U, B>(this, boundary, bufferSupplier));
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers. It emits the current buffer and replaces it with a
* new buffer whenever the ObservableSource produced by the specified {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="395" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer1.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B> the value type of the boundary-providing ObservableSource
* @param boundarySupplier
* a {@link Callable} that produces an ObservableSource that governs the boundary between buffers.
* Whenever the source {@code ObservableSource} emits an item, {@code buffer} emits the current buffer and
* begins to fill a new one
* @return an Observable that emits a connected, non-overlapping buffer of items from the source ObservableSource
* each time the ObservableSource created with the {@code closingIndicator} argument emits an item
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<List<T>> buffer(Callable<? extends ObservableSource<B>> boundarySupplier) {
return buffer(boundarySupplier, ArrayListSupplier.<T>asCallable());
}
/**
* Returns an Observable that emits buffers of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping buffers. It emits the current buffer and replaces it with a
* new buffer whenever the ObservableSource produced by the specified {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="395" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/buffer1.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code buffer} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the collection subclass type to buffer into
* @param <B> the value type of the boundary-providing ObservableSource
* @param boundarySupplier
* a {@link Callable} that produces an ObservableSource that governs the boundary between buffers.
* Whenever the source {@code ObservableSource} emits an item, {@code buffer} emits the current buffer and
* begins to fill a new one
* @param bufferSupplier
* a factory function that returns an instance of the collection subclass to be used and returned
* as the buffer
* @return an Observable that emits a connected, non-overlapping buffer of items from the source ObservableSource
* each time the ObservableSource created with the {@code closingIndicator} argument emits an item
* @see <a href="http://reactivex.io/documentation/operators/buffer.html">ReactiveX operators documentation: Buffer</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B, U extends Collection<? super T>> Observable<U> buffer(Callable<? extends ObservableSource<B>> boundarySupplier, Callable<U> bufferSupplier) {
ObjectHelper.requireNonNull(boundarySupplier, "boundarySupplier is null");
ObjectHelper.requireNonNull(bufferSupplier, "bufferSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableBufferBoundarySupplier<T, U, B>(this, boundarySupplier, bufferSupplier));
}
/**
* Returns an Observable that subscribes to this ObservableSource lazily, caches all of its events
* and replays them, in the same order as received, to all the downstream subscribers.
* <p>
* <img width="640" height="410" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/cache.png" alt="">
* <p>
* This is useful when you want an ObservableSource to cache responses and you can't control the
* subscribe/dispose behavior of all the {@link Observer}s.
* <p>
* The operator subscribes only when the first downstream subscriber subscribes and maintains
* a single subscription towards this ObservableSource. In contrast, the operator family of {@link #replay()}
* that return a {@link ConnectableObservable} require an explicit call to {@link ConnectableObservable#connect()}.
* <p>
* <em>Note:</em> You sacrifice the ability to dispose the origin when you use the {@code cache}
* Observer so be careful not to use this Observer on ObservableSources that emit an infinite or very large number
* of items that will use up memory.
* A possible workaround is to apply `takeUntil` with a predicate or
* another source before (and perhaps after) the application of cache().
* <pre><code>
* AtomicBoolean shouldStop = new AtomicBoolean();
*
* source.takeUntil(v -> shouldStop.get())
* .cache()
* .takeUntil(v -> shouldStop.get())
* .subscribe(...);
* </code></pre>
* Since the operator doesn't allow clearing the cached values either, the possible workaround is
* to forget all references to it via {@link #onTerminateDetach()} applied along with the previous
* workaround:
* <pre><code>
* AtomicBoolean shouldStop = new AtomicBoolean();
*
* source.takeUntil(v -> shouldStop.get())
* .onTerminateDetach()
* .cache()
* .takeUntil(v -> shouldStop.get())
* .onTerminateDetach()
* .subscribe(...);
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code cache} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that, when first subscribed to, caches all of its items and notifications for the
* benefit of subsequent subscribers
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> cache() {
return ObservableCache.from(this);
}
/**
* Returns an Observable that subscribes to this ObservableSource lazily, caches all of its events
* and replays them, in the same order as received, to all the downstream subscribers.
* <p>
* <img width="640" height="410" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/cache.png" alt="">
* <p>
* This is useful when you want an ObservableSource to cache responses and you can't control the
* subscribe/dispose behavior of all the {@link Observer}s.
* <p>
* The operator subscribes only when the first downstream subscriber subscribes and maintains
* a single subscription towards this ObservableSource. In contrast, the operator family of {@link #replay()}
* that return a {@link ConnectableObservable} require an explicit call to {@link ConnectableObservable#connect()}.
* <p>
* <em>Note:</em> You sacrifice the ability to dispose the origin when you use the {@code cache}
* Observer so be careful not to use this Observer on ObservableSources that emit an infinite or very large number
* of items that will use up memory.
* A possible workaround is to apply `takeUntil` with a predicate or
* another source before (and perhaps after) the application of cache().
* <pre><code>
* AtomicBoolean shouldStop = new AtomicBoolean();
*
* source.takeUntil(v -> shouldStop.get())
* .cache()
* .takeUntil(v -> shouldStop.get())
* .subscribe(...);
* </code></pre>
* Since the operator doesn't allow clearing the cached values either, the possible workaround is
* to forget all references to it via {@link #onTerminateDetach()} applied along with the previous
* workaround:
* <pre><code>
* AtomicBoolean shouldStop = new AtomicBoolean();
*
* source.takeUntil(v -> shouldStop.get())
* .onTerminateDetach()
* .cache()
* .takeUntil(v -> shouldStop.get())
* .onTerminateDetach()
* .subscribe(...);
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code cacheWithInitialCapacity} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* <p>
* <em>Note:</em> The capacity hint is not an upper bound on cache size. For that, consider
* {@link #replay(int)} in combination with {@link ConnectableObservable#autoConnect()} or similar.
*
* @param initialCapacity hint for number of items to cache (for optimizing underlying data structure)
* @return an Observable that, when first subscribed to, caches all of its items and notifications for the
* benefit of subsequent subscribers
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> cacheWithInitialCapacity(int initialCapacity) {
return ObservableCache.from(this, initialCapacity);
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource, converted to the specified
* type.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/cast.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code cast} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the output value type cast to
* @param clazz
* the target class type that {@code cast} will cast the items emitted by the source ObservableSource
* into before emitting them from the resulting ObservableSource
* @return an Observable that emits each item from the source ObservableSource after converting it to the
* specified type
* @see <a href="http://reactivex.io/documentation/operators/map.html">ReactiveX operators documentation: Map</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<U> cast(final Class<U> clazz) {
ObjectHelper.requireNonNull(clazz, "clazz is null");
return map(Functions.castFunction(clazz));
}
/**
* Collects items emitted by the source ObservableSource into a single mutable data structure and returns
* a Single that emits this structure.
* <p>
* <img width="640" height="330" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/collect.2.png" alt="">
* <p>
* This is a simplified version of {@code reduce} that does not need to return the state on each pass.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code collect} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the accumulator and output type
* @param initialValueSupplier
* the mutable data structure that will collect the items
* @param collector
* a function that accepts the {@code state} and an emitted item, and modifies {@code state}
* accordingly
* @return a Single that emits the result of collecting the values emitted by the source ObservableSource
* into a single mutable data structure
* @see <a href="http://reactivex.io/documentation/operators/reduce.html">ReactiveX operators documentation: Reduce</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Single<U> collect(Callable<? extends U> initialValueSupplier, BiConsumer<? super U, ? super T> collector) {
ObjectHelper.requireNonNull(initialValueSupplier, "initialValueSupplier is null");
ObjectHelper.requireNonNull(collector, "collector is null");
return RxJavaPlugins.onAssembly(new ObservableCollectSingle<T, U>(this, initialValueSupplier, collector));
}
/**
* Collects items emitted by the source ObservableSource into a single mutable data structure and returns
* a Single that emits this structure.
* <p>
* <img width="640" height="330" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/collect.2.png" alt="">
* <p>
* This is a simplified version of {@code reduce} that does not need to return the state on each pass.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code collectInto} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the accumulator and output type
* @param initialValue
* the mutable data structure that will collect the items
* @param collector
* a function that accepts the {@code state} and an emitted item, and modifies {@code state}
* accordingly
* @return a Single that emits the result of collecting the values emitted by the source ObservableSource
* into a single mutable data structure
* @see <a href="http://reactivex.io/documentation/operators/reduce.html">ReactiveX operators documentation: Reduce</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Single<U> collectInto(final U initialValue, BiConsumer<? super U, ? super T> collector) {
ObjectHelper.requireNonNull(initialValue, "initialValue is null");
return collect(Functions.justCallable(initialValue), collector);
}
/**
* Transform an ObservableSource by applying a particular Transformer function to it.
* <p>
* This method operates on the ObservableSource itself whereas {@link #lift} operates on the ObservableSource's
* Observers.
* <p>
* If the operator you are creating is designed to act on the individual items emitted by a source
* ObservableSource, use {@link #lift}. If your operator is designed to transform the source ObservableSource as a whole
* (for instance, by applying a particular set of existing RxJava operators to it) use {@code compose}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code compose} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the value type of the output ObservableSource
* @param composer implements the function that transforms the source ObservableSource
* @return the source ObservableSource, transformed by the transformer function
* @see <a href="https://github.com/ReactiveX/RxJava/wiki/Implementing-Your-Own-Operators">RxJava wiki: Implementing Your Own Operators</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> compose(ObservableTransformer<? super T, ? extends R> composer) {
return wrap(((ObservableTransformer<T, R>) ObjectHelper.requireNonNull(composer, "composer is null")).apply(this));
}
/**
* Returns a new Observable that emits items resulting from applying a function that you supply to each item
* emitted by the source ObservableSource, where that function returns an ObservableSource, and then emitting the items
* that result from concatenating those resulting ObservableSources.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the type of the inner ObservableSource sources and thus the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and concatenating the ObservableSources obtained from this transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
return concatMap(mapper, 2);
}
/**
* Returns a new Observable that emits items resulting from applying a function that you supply to each item
* emitted by the source ObservableSource, where that function returns an ObservableSource, and then emitting the items
* that result from concatenating those resulting ObservableSources.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concatMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the type of the inner ObservableSource sources and thus the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param prefetch
* the number of elements to prefetch from the current Observable
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and concatenating the ObservableSources obtained from this transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int prefetch) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(prefetch, "prefetch");
if (this instanceof ScalarCallable) {
@SuppressWarnings("unchecked")
T v = ((ScalarCallable<T>)this).call();
if (v == null) {
return empty();
}
return ObservableScalarXMap.scalarXMap(v, mapper);
}
return RxJavaPlugins.onAssembly(new ObservableConcatMap<T, R>(this, mapper, prefetch, ErrorMode.IMMEDIATE));
}
/**
* Maps each of the items into an ObservableSource, subscribes to them one after the other,
* one at a time and emits their values in order
* while delaying any error from either this or any of the inner ObservableSources
* till all of them terminate.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatMapDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the result value type
* @param mapper the function that maps the items of this ObservableSource into the inner ObservableSources.
* @return the new ObservableSource instance with the concatenation behavior
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
return concatMapDelayError(mapper, bufferSize(), true);
}
/**
* Maps each of the items into an ObservableSource, subscribes to them one after the other,
* one at a time and emits their values in order
* while delaying any error from either this or any of the inner ObservableSources
* till all of them terminate.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatMapDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the result value type
* @param mapper the function that maps the items of this ObservableSource into the inner ObservableSources.
* @param prefetch
* the number of elements to prefetch from the current Observable
* @param tillTheEnd
* if true, all errors from the outer and inner ObservableSource sources are delayed until the end,
* if false, an error from the main source is signalled when the current ObservableSource source terminates
* @return the new ObservableSource instance with the concatenation behavior
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
int prefetch, boolean tillTheEnd) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(prefetch, "prefetch");
if (this instanceof ScalarCallable) {
@SuppressWarnings("unchecked")
T v = ((ScalarCallable<T>)this).call();
if (v == null) {
return empty();
}
return ObservableScalarXMap.scalarXMap(v, mapper);
}
return RxJavaPlugins.onAssembly(new ObservableConcatMap<T, R>(this, mapper, prefetch, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY));
}
/**
* Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single
* ObservableSource.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them in
* order, each one after the previous one completes.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the value type
* @param mapper the function that maps a sequence of values into a sequence of ObservableSources that will be
* eagerly concatenated
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMapEager(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
return concatMapEager(mapper, Integer.MAX_VALUE, bufferSize());
}
/**
* Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single
* ObservableSource.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them in
* order, each one after the previous one completes.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the value type
* @param mapper the function that maps a sequence of values into a sequence of ObservableSources that will be
* eagerly concatenated
* @param maxConcurrency the maximum number of concurrent subscribed ObservableSources
* @param prefetch hints about the number of expected values from each inner ObservableSource, must be positive
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMapEager(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
int maxConcurrency, int prefetch) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
ObjectHelper.verifyPositive(prefetch, "prefetch");
return RxJavaPlugins.onAssembly(new ObservableConcatMapEager<T, R>(this, mapper, ErrorMode.IMMEDIATE, maxConcurrency, prefetch));
}
/**
* Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single
* ObservableSource.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them in
* order, each one after the previous one completes.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the value type
* @param mapper the function that maps a sequence of values into a sequence of ObservableSources that will be
* eagerly concatenated
* @param tillTheEnd
* if true, all errors from the outer and inner ObservableSource sources are delayed until the end,
* if false, an error from the main source is signalled when the current ObservableSource source terminates
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMapEagerDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
boolean tillTheEnd) {
return concatMapEagerDelayError(mapper, Integer.MAX_VALUE, bufferSize(), tillTheEnd);
}
/**
* Maps a sequence of values into ObservableSources and concatenates these ObservableSources eagerly into a single
* ObservableSource.
* <p>
* Eager concatenation means that once a subscriber subscribes, this operator subscribes to all of the
* source ObservableSources. The operator buffers the values emitted by these ObservableSources and then drains them in
* order, each one after the previous one completes.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the value type
* @param mapper the function that maps a sequence of values into a sequence of ObservableSources that will be
* eagerly concatenated
* @param maxConcurrency the maximum number of concurrent subscribed ObservableSources
* @param prefetch
* the number of elements to prefetch from each source ObservableSource
* @param tillTheEnd
* if true, exceptions from the current Observable and all the inner ObservableSources are delayed until
* all of them terminate, if false, exception from the current Observable is delayed until the
* currently running ObservableSource terminates
* @return the new ObservableSource instance with the specified concatenation behavior
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> concatMapEagerDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
int maxConcurrency, int prefetch, boolean tillTheEnd) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
ObjectHelper.verifyPositive(prefetch, "prefetch");
return RxJavaPlugins.onAssembly(new ObservableConcatMapEager<T, R>(this, mapper, tillTheEnd ? ErrorMode.END : ErrorMode.BOUNDARY, maxConcurrency, prefetch));
}
/**
* Returns an Observable that concatenate each item emitted by the source ObservableSource with the values in an
* Iterable corresponding to that item that is generated by a selector.
* <p>
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatMapIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of item emitted by the resulting ObservableSource
* @param mapper
* a function that returns an Iterable sequence of values for when given an item emitted by the
* source ObservableSource
* @return an Observable that emits the results of concatenating the items emitted by the source ObservableSource with
* the values in the Iterables corresponding to those items, as generated by {@code collectionSelector}
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<U> concatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
return RxJavaPlugins.onAssembly(new ObservableFlattenIterable<T, U>(this, mapper));
}
/**
* Returns an Observable that concatenate each item emitted by the source ObservableSource with the values in an
* Iterable corresponding to that item that is generated by a selector.
* <p>
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatMapIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of item emitted by the resulting ObservableSource
* @param mapper
* a function that returns an Iterable sequence of values for when given an item emitted by the
* source ObservableSource
* @param prefetch
* the number of elements to prefetch from the current Observable
* @return an Observable that emits the results of concatenating the items emitted by the source ObservableSource with
* the values in the Iterables corresponding to those items, as generated by {@code collectionSelector}
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<U> concatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper, int prefetch) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(prefetch, "prefetch");
return concatMap(ObservableInternalHelper.flatMapIntoIterable(mapper), prefetch);
}
/**
* Returns an Observable that emits the items emitted from the current ObservableSource, then the next, one after
* the other, without interleaving them.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/concat.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code concatWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param other
* an ObservableSource to be concatenated after the current
* @return an Observable that emits items emitted by the two source ObservableSources, one after the other,
* without interleaving them
* @see <a href="http://reactivex.io/documentation/operators/concat.html">ReactiveX operators documentation: Concat</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> concatWith(ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return concat(this, other);
}
/**
* Returns an Observable that emits a Boolean that indicates whether the source ObservableSource emitted a
* specified item.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/contains.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code contains} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param element
* the item to search for in the emissions from the source ObservableSource
* @return a Single that emits {@code true} if the specified item is emitted by the source ObservableSource,
* or {@code false} if the source ObservableSource completes without emitting that item
* @see <a href="http://reactivex.io/documentation/operators/contains.html">ReactiveX operators documentation: Contains</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<Boolean> contains(final Object element) {
ObjectHelper.requireNonNull(element, "element is null");
return any(Functions.equalsWith(element));
}
/**
* Returns a Single that counts the total number of items emitted by the source ObservableSource and emits
* this count as a 64-bit Long.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/count.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code count} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a Single that emits a single item: the number of items emitted by the source ObservableSource as a
* 64-bit Long item
* @see <a href="http://reactivex.io/documentation/operators/count.html">ReactiveX operators documentation: Count</a>
* @see #count()
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<Long> count() {
return RxJavaPlugins.onAssembly(new ObservableCountSingle<T>(this));
}
/**
* Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the
* source ObservableSource that are followed by another item within a computed debounce duration.
* <p>
* <img width="640" height="425" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/debounce.f.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code debounce} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the debounce value type (ignored)
* @param debounceSelector
* function to retrieve a sequence that indicates the throttle duration for each item
* @return an Observable that omits items emitted by the source ObservableSource that are followed by another item
* within a computed debounce duration
* @see <a href="http://reactivex.io/documentation/operators/debounce.html">ReactiveX operators documentation: Debounce</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> debounce(Function<? super T, ? extends ObservableSource<U>> debounceSelector) {
ObjectHelper.requireNonNull(debounceSelector, "debounceSelector is null");
return RxJavaPlugins.onAssembly(new ObservableDebounce<T, U>(this, debounceSelector));
}
/**
* Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the
* source ObservableSource that are followed by newer items before a timeout value expires. The timer resets on
* each emission.
* <p>
* <em>Note:</em> If items keep being emitted by the source ObservableSource faster than the timeout then no items
* will be emitted by the resulting ObservableSource.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/debounce.png" alt="">
* <p>
* Information on debounce vs throttle:
* <p>
* <ul>
* <li><a href="http://drupalmotion.com/article/debounce-and-throttle-visual-explanation">Debounce and Throttle: visual explanation</a></li>
* <li><a href="http://unscriptable.com/2009/03/20/debouncing-javascript-methods/">Debouncing: javascript methods</a></li>
* <li><a href="http://www.illyriad.co.uk/blog/index.php/2011/09/javascript-dont-spam-your-server-debounce-and-throttle/">Javascript - don't spam your server: debounce and throttle</a></li>
* </ul>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code debounce} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timeout
* the time each item has to be "the most recent" of those emitted by the source ObservableSource to
* ensure that it's not dropped
* @param unit
* the {@link TimeUnit} for the timeout
* @return an Observable that filters out items from the source ObservableSource that are too quickly followed by
* newer items
* @see <a href="http://reactivex.io/documentation/operators/debounce.html">ReactiveX operators documentation: Debounce</a>
* @see #throttleWithTimeout(long, TimeUnit)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> debounce(long timeout, TimeUnit unit) {
return debounce(timeout, unit, Schedulers.computation());
}
/**
* Returns an Observable that mirrors the source ObservableSource, except that it drops items emitted by the
* source ObservableSource that are followed by newer items before a timeout value expires on a specified
* Scheduler. The timer resets on each emission.
* <p>
* <em>Note:</em> If items keep being emitted by the source ObservableSource faster than the timeout then no items
* will be emitted by the resulting ObservableSource.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/debounce.s.png" alt="">
* <p>
* Information on debounce vs throttle:
* <p>
* <ul>
* <li><a href="http://drupalmotion.com/article/debounce-and-throttle-visual-explanation">Debounce and Throttle: visual explanation</a></li>
* <li><a href="http://unscriptable.com/2009/03/20/debouncing-javascript-methods/">Debouncing: javascript methods</a></li>
* <li><a href="http://www.illyriad.co.uk/blog/index.php/2011/09/javascript-dont-spam-your-server-debounce-and-throttle/">Javascript - don't spam your server: debounce and throttle</a></li>
* </ul>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timeout
* the time each item has to be "the most recent" of those emitted by the source ObservableSource to
* ensure that it's not dropped
* @param unit
* the unit of time for the specified timeout
* @param scheduler
* the {@link Scheduler} to use internally to manage the timers that handle the timeout for each
* item
* @return an Observable that filters out items from the source ObservableSource that are too quickly followed by
* newer items
* @see <a href="http://reactivex.io/documentation/operators/debounce.html">ReactiveX operators documentation: Debounce</a>
* @see #throttleWithTimeout(long, TimeUnit, Scheduler)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> debounce(long timeout, TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableDebounceTimed<T>(this, timeout, unit, scheduler));
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource or a specified default item
* if the source ObservableSource is empty.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/defaultIfEmpty.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code defaultIfEmpty} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* the item to emit if the source ObservableSource emits no items
* @return an Observable that emits either the specified default item if the source ObservableSource emits no
* items, or the items emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/defaultifempty.html">ReactiveX operators documentation: DefaultIfEmpty</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> defaultIfEmpty(T defaultItem) {
ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
return switchIfEmpty(just(defaultItem));
}
/**
* Returns an Observable that delays the emissions of the source ObservableSource via another ObservableSource on a
* per-item basis.
* <p>
* <img width="640" height="450" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.o.png" alt="">
* <p>
* <em>Note:</em> the resulting ObservableSource will immediately propagate any {@code onError} notification
* from the source ObservableSource.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code delay} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the item delay value type (ignored)
* @param itemDelay
* a function that returns an ObservableSource for each item emitted by the source ObservableSource, which is
* then used to delay the emission of that item by the resulting ObservableSource until the ObservableSource
* returned from {@code itemDelay} emits an item
* @return an Observable that delays the emissions of the source ObservableSource via another ObservableSource on a
* per-item basis
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> delay(final Function<? super T, ? extends ObservableSource<U>> itemDelay) {
ObjectHelper.requireNonNull(itemDelay, "itemDelay is null");
return flatMap(ObservableInternalHelper.itemDelay(itemDelay));
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a
* specified delay. Error notifications from the source ObservableSource are not delayed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code delay} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param delay
* the delay to shift the source by
* @param unit
* the {@link TimeUnit} in which {@code period} is defined
* @return the source ObservableSource shifted in time by the specified delay
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> delay(long delay, TimeUnit unit) {
return delay(delay, unit, Schedulers.computation(), false);
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a
* specified delay. Error notifications from the source ObservableSource are not delayed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code delay} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param delay
* the delay to shift the source by
* @param unit
* the {@link TimeUnit} in which {@code period} is defined
* @param delayError
* if true, the upstream exception is signalled with the given delay, after all preceding normal elements,
* if false, the upstream exception is signalled immediately
* @return the source ObservableSource shifted in time by the specified delay
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> delay(long delay, TimeUnit unit, boolean delayError) {
return delay(delay, unit, Schedulers.computation(), delayError);
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a
* specified delay. Error notifications from the source ObservableSource are not delayed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param delay
* the delay to shift the source by
* @param unit
* the time unit of {@code delay}
* @param scheduler
* the {@link Scheduler} to use for delaying
* @return the source ObservableSource shifted in time by the specified delay
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> delay(long delay, TimeUnit unit, Scheduler scheduler) {
return delay(delay, unit, scheduler, false);
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource shifted forward in time by a
* specified delay. Error notifications from the source ObservableSource are not delayed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param delay
* the delay to shift the source by
* @param unit
* the time unit of {@code delay}
* @param scheduler
* the {@link Scheduler} to use for delaying
* @param delayError
* if true, the upstream exception is signalled with the given delay, after all preceding normal elements,
* if false, the upstream exception is signalled immediately
* @return the source ObservableSource shifted in time by the specified delay
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> delay(long delay, TimeUnit unit, Scheduler scheduler, boolean delayError) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableDelay<T>(this, delay, unit, scheduler, delayError));
}
/**
* Returns an Observable that delays the subscription to and emissions from the source ObservableSource via another
* ObservableSource on a per-item basis.
* <p>
* <img width="640" height="450" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delay.oo.png" alt="">
* <p>
* <em>Note:</em> the resulting ObservableSource will immediately propagate any {@code onError} notification
* from the source ObservableSource.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code delay} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the subscription delay value type (ignored)
* @param <V>
* the item delay value type (ignored)
* @param subscriptionDelay
* a function that returns an ObservableSource that triggers the subscription to the source ObservableSource
* once it emits any item
* @param itemDelay
* a function that returns an ObservableSource for each item emitted by the source ObservableSource, which is
* then used to delay the emission of that item by the resulting ObservableSource until the ObservableSource
* returned from {@code itemDelay} emits an item
* @return an Observable that delays the subscription and emissions of the source ObservableSource via another
* ObservableSource on a per-item basis
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, V> Observable<T> delay(ObservableSource<U> subscriptionDelay,
Function<? super T, ? extends ObservableSource<V>> itemDelay) {
return delaySubscription(subscriptionDelay).delay(itemDelay);
}
/**
* Returns an Observable that delays the subscription to this Observable
* until the other Observable emits an element or completes normally.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delaySubscription.o.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This method does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the value type of the other Observable, irrelevant
* @param other the other Observable that should trigger the subscription
* to this Observable.
* @return an Observable that delays the subscription to this Observable
* until the other Observable emits an element or completes normally.
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> delaySubscription(ObservableSource<U> other) {
ObjectHelper.requireNonNull(other, "other is null");
return RxJavaPlugins.onAssembly(new ObservableDelaySubscriptionOther<T, U>(this, other));
}
/**
* Returns an Observable that delays the subscription to the source ObservableSource by a given amount of time.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delaySubscription.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code delaySubscription} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param delay
* the time to delay the subscription
* @param unit
* the time unit of {@code delay}
* @return an Observable that delays the subscription to the source ObservableSource by the given amount
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> delaySubscription(long delay, TimeUnit unit) {
return delaySubscription(delay, unit, Schedulers.computation());
}
/**
* Returns an Observable that delays the subscription to the source ObservableSource by a given amount of time,
* both waiting and subscribing on a given Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/delaySubscription.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param delay
* the time to delay the subscription
* @param unit
* the time unit of {@code delay}
* @param scheduler
* the Scheduler on which the waiting and subscription will happen
* @return an Observable that delays the subscription to the source ObservableSource by a given
* amount, waiting and subscribing on the given Scheduler
* @see <a href="http://reactivex.io/documentation/operators/delay.html">ReactiveX operators documentation: Delay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> delaySubscription(long delay, TimeUnit unit, Scheduler scheduler) {
return delaySubscription(timer(delay, unit, scheduler));
}
/**
* Returns an Observable that reverses the effect of {@link #materialize materialize} by transforming the
* {@link Notification} objects emitted by the source ObservableSource into the items or notifications they
* represent.
* <p>
* <img width="640" height="335" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/dematerialize.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code dematerialize} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T2> the output value type
* @return an Observable that emits the items and notifications embedded in the {@link Notification} objects
* emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/materialize-dematerialize.html">ReactiveX operators documentation: Dematerialize</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <T2> Observable<T2> dematerialize() {
@SuppressWarnings("unchecked")
Observable<Notification<T2>> m = (Observable<Notification<T2>>)this;
return RxJavaPlugins.onAssembly(new ObservableDematerialize<T2>(m));
}
/**
* Returns an Observable that emits all items emitted by the source ObservableSource that are distinct.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/distinct.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code distinct} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that emits only those items emitted by the source ObservableSource that are distinct from
* each other
* @see <a href="http://reactivex.io/documentation/operators/distinct.html">ReactiveX operators documentation: Distinct</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> distinct() {
return distinct(Functions.identity(), Functions.createHashSet());
}
/**
* Returns an Observable that emits all items emitted by the source ObservableSource that are distinct according
* to a key selector function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/distinct.key.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code distinct} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type
* @param keySelector
* a function that projects an emitted item to a key value that is used to decide whether an item
* is distinct from another one or not
* @return an Observable that emits those items emitted by the source ObservableSource that have distinct keys
* @see <a href="http://reactivex.io/documentation/operators/distinct.html">ReactiveX operators documentation: Distinct</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Observable<T> distinct(Function<? super T, K> keySelector) {
return distinct(keySelector, Functions.createHashSet());
}
/**
* Returns an Observable that emits all items emitted by the source ObservableSource that are distinct according
* to a key selector function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/distinct.key.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code distinct} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type
* @param keySelector
* a function that projects an emitted item to a key value that is used to decide whether an item
* is distinct from another one or not
* @param collectionSupplier
* function called for each individual Observer to return a Collection subtype for holding the extracted
* keys and whose add() method's return indicates uniqueness.
* @return an Observable that emits those items emitted by the source ObservableSource that have distinct keys
* @see <a href="http://reactivex.io/documentation/operators/distinct.html">ReactiveX operators documentation: Distinct</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Observable<T> distinct(Function<? super T, K> keySelector, Callable<? extends Collection<? super K>> collectionSupplier) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableDistinct<T, K>(this, keySelector, collectionSupplier));
}
/**
* Returns an Observable that emits all items emitted by the source ObservableSource that are distinct from their
* immediate predecessors.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/distinctUntilChanged.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code distinctUntilChanged} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that emits those items from the source ObservableSource that are distinct from their
* immediate predecessors
* @see <a href="http://reactivex.io/documentation/operators/distinct.html">ReactiveX operators documentation: Distinct</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> distinctUntilChanged() {
return distinctUntilChanged(Functions.identity());
}
/**
* Returns an Observable that emits all items emitted by the source ObservableSource that are distinct from their
* immediate predecessors, according to a key selector function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/distinctUntilChanged.key.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code distinctUntilChanged} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type
* @param keySelector
* a function that projects an emitted item to a key value that is used to decide whether an item
* is distinct from another one or not
* @return an Observable that emits those items from the source ObservableSource whose keys are distinct from
* those of their immediate predecessors
* @see <a href="http://reactivex.io/documentation/operators/distinct.html">ReactiveX operators documentation: Distinct</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Observable<T> distinctUntilChanged(Function<? super T, K> keySelector) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
return RxJavaPlugins.onAssembly(new ObservableDistinctUntilChanged<T, K>(this, keySelector, ObjectHelper.equalsPredicate()));
}
/**
* Returns an Observable that emits all items emitted by the source ObservableSource that are distinct from their
* immediate predecessors when compared with each other via the provided comparator function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/distinctUntilChanged.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code distinctUntilChanged} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param comparer the function that receives the previous item and the current item and is
* expected to return true if the two are equal, thus skipping the current value.
* @return an Observable that emits those items from the source ObservableSource that are distinct from their
* immediate predecessors
* @see <a href="http://reactivex.io/documentation/operators/distinct.html">ReactiveX operators documentation: Distinct</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> distinctUntilChanged(BiPredicate<? super T, ? super T> comparer) {
ObjectHelper.requireNonNull(comparer, "comparer is null");
return RxJavaPlugins.onAssembly(new ObservableDistinctUntilChanged<T, T>(this, Functions.<T>identity(), comparer));
}
/**
* Calls the specified consumer with the current item after this item has been emitted to the downstream.
* <p>Note that the {@code onAfterNext} action is shared between subscriptions and as such
* should be thread-safe.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doAfterNext} does not operate by default on a particular {@link Scheduler}.</dd>
* <td><b>Operator-fusion:</b></dt>
* <dd>This operator supports boundary-limited synchronous or asynchronous queue-fusion.</dd>
* </dl>
* <p>History: 2.0.1 - experimental
* @param onAfterNext the Consumer that will be called after emitting an item from upstream to the downstream
* @return the new Observable instance
* @since 2.1
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doAfterNext(Consumer<? super T> onAfterNext) {
ObjectHelper.requireNonNull(onAfterNext, "onAfterNext is null");
return RxJavaPlugins.onAssembly(new ObservableDoAfterNext<T>(this, onAfterNext));
}
/**
* Registers an {@link Action} to be called when this ObservableSource invokes either
* {@link Observer#onComplete onComplete} or {@link Observer#onError onError}.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doAfterTerminate.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doAfterTerminate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onFinally
* an {@link Action} to be invoked when the source ObservableSource finishes
* @return an Observable that emits the same items as the source ObservableSource, then invokes the
* {@link Action}
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
* @see #doOnTerminate(Action)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doAfterTerminate(Action onFinally) {
ObjectHelper.requireNonNull(onFinally, "onFinally is null");
return doOnEach(Functions.emptyConsumer(), Functions.emptyConsumer(), Functions.EMPTY_ACTION, onFinally);
}
/**
* Calls the specified action after this Observable signals onError or onCompleted or gets disposed by
* the downstream.
* <p>In case of a race between a terminal event and a dispose call, the provided {@code onFinally} action
* is executed once per subscription.
* <p>Note that the {@code onFinally} action is shared between subscriptions and as such
* should be thread-safe.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doFinally} does not operate by default on a particular {@link Scheduler}.</dd>
* <td><b>Operator-fusion:</b></dt>
* <dd>This operator supports boundary-limited synchronous or asynchronous queue-fusion.</dd>
* </dl>
* <p>History: 2.0.1 - experimental
* @param onFinally the action called when this Observable terminates or gets cancelled
* @return the new Observable instance
* @since 2.1
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doFinally(Action onFinally) {
ObjectHelper.requireNonNull(onFinally, "onFinally is null");
return RxJavaPlugins.onAssembly(new ObservableDoFinally<T>(this, onFinally));
}
/**
* Calls the dispose {@code Action} if the downstream disposes the sequence.
* <p>
* The action is shared between subscriptions and thus may be called concurrently from multiple
* threads; the action must be thread safe.
* <p>
* If the action throws a runtime exception, that exception is rethrown by the {@code dispose()} call,
* sometimes as a {@code CompositeException} if there were multiple exceptions along the way.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnUnsubscribe.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnDispose} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onDispose
* the action that gets called when the source {@code ObservableSource}'s Disposable is disposed
* @return the source {@code ObservableSource} modified so as to call this Action when appropriate
* @throws NullPointerException if onDispose is null
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnDispose(Action onDispose) {
return doOnLifecycle(Functions.emptyConsumer(), onDispose);
}
/**
* Modifies the source ObservableSource so that it invokes an action when it calls {@code onComplete}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnComplete.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnComplete} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onComplete
* the action to invoke when the source ObservableSource calls {@code onComplete}
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnComplete(Action onComplete) {
return doOnEach(Functions.emptyConsumer(), Functions.emptyConsumer(), onComplete, Functions.EMPTY_ACTION);
}
/**
* Calls the appropriate onXXX consumer (shared between all subscribers) whenever a signal with the same type
* passes through, before forwarding them to downstream.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnEach.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnEach} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
private Observable<T> doOnEach(Consumer<? super T> onNext, Consumer<? super Throwable> onError, Action onComplete, Action onAfterTerminate) {
ObjectHelper.requireNonNull(onNext, "onNext is null");
ObjectHelper.requireNonNull(onError, "onError is null");
ObjectHelper.requireNonNull(onComplete, "onComplete is null");
ObjectHelper.requireNonNull(onAfterTerminate, "onAfterTerminate is null");
return RxJavaPlugins.onAssembly(new ObservableDoOnEach<T>(this, onNext, onError, onComplete, onAfterTerminate));
}
/**
* Modifies the source ObservableSource so that it invokes an action for each item it emits.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnEach.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnEach} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNotification
* the action to invoke for each item emitted by the source ObservableSource
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnEach(final Consumer<? super Notification<T>> onNotification) {
ObjectHelper.requireNonNull(onNotification, "consumer is null");
return doOnEach(
Functions.notificationOnNext(onNotification),
Functions.notificationOnError(onNotification),
Functions.notificationOnComplete(onNotification),
Functions.EMPTY_ACTION
);
}
/**
* Modifies the source ObservableSource so that it notifies an Observer for each item and terminal event it emits.
* <p>
* In case the {@code onError} of the supplied observer throws, the downstream will receive a composite
* exception containing the original exception and the exception thrown by {@code onError}. If either the
* {@code onNext} or the {@code onComplete} method of the supplied observer throws, the downstream will be
* terminated and will receive this thrown exception.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnEach.o.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnEach} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param observer
* the observer to be notified about onNext, onError and onComplete events on its
* respective methods before the actual downstream Observer gets notified.
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnEach(final Observer<? super T> observer) {
ObjectHelper.requireNonNull(observer, "observer is null");
return doOnEach(
ObservableInternalHelper.observerOnNext(observer),
ObservableInternalHelper.observerOnError(observer),
ObservableInternalHelper.observerOnComplete(observer),
Functions.EMPTY_ACTION);
}
/**
* Modifies the source ObservableSource so that it invokes an action if it calls {@code onError}.
* <p>
* In case the {@code onError} action throws, the downstream will receive a composite exception containing
* the original exception and the exception thrown by {@code onError}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnError.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onError
* the action to invoke if the source ObservableSource calls {@code onError}
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnError(Consumer<? super Throwable> onError) {
return doOnEach(Functions.emptyConsumer(), onError, Functions.EMPTY_ACTION, Functions.EMPTY_ACTION);
}
/**
* Calls the appropriate onXXX method (shared between all Observer) for the lifecycle events of
* the sequence (subscription, cancellation, requesting).
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnLifecycle.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnLifecycle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onSubscribe
* a Consumer called with the Disposable sent via Observer.onSubscribe()
* @param onDispose
* called when the downstream disposes the Disposable via dispose()
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnLifecycle(final Consumer<? super Disposable> onSubscribe, final Action onDispose) {
ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
ObjectHelper.requireNonNull(onDispose, "onDispose is null");
return RxJavaPlugins.onAssembly(new ObservableDoOnLifecycle<T>(this, onSubscribe, onDispose));
}
/**
* Modifies the source ObservableSource so that it invokes an action when it calls {@code onNext}.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnNext.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* the action to invoke when the source ObservableSource calls {@code onNext}
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnNext(Consumer<? super T> onNext) {
return doOnEach(onNext, Functions.emptyConsumer(), Functions.EMPTY_ACTION, Functions.EMPTY_ACTION);
}
/**
* Modifies the source {@code ObservableSource} so that it invokes the given action when it is subscribed from
* its subscribers. Each subscription will result in an invocation of the given action except when the
* source {@code ObservableSource} is reference counted, in which case the source {@code ObservableSource} will invoke
* the given action for the first subscription.
* <p>
* <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnSubscribe.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onSubscribe
* the Consumer that gets called when an Observer subscribes to the current {@code Observable}
* @return the source {@code ObservableSource} modified so as to call this Consumer when appropriate
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnSubscribe(Consumer<? super Disposable> onSubscribe) {
return doOnLifecycle(onSubscribe, Functions.EMPTY_ACTION);
}
/**
* Modifies the source ObservableSource so that it invokes an action when it calls {@code onComplete} or
* {@code onError}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/doOnTerminate.png" alt="">
* <p>
* This differs from {@code doAfterTerminate} in that this happens <em>before</em> the {@code onComplete} or
* {@code onError} notification.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code doOnTerminate} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onTerminate
* the action to invoke when the source ObservableSource calls {@code onComplete} or {@code onError}
* @return the source ObservableSource with the side-effecting behavior applied
* @see <a href="http://reactivex.io/documentation/operators/do.html">ReactiveX operators documentation: Do</a>
* @see #doAfterTerminate(Action)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> doOnTerminate(final Action onTerminate) {
ObjectHelper.requireNonNull(onTerminate, "onTerminate is null");
return doOnEach(Functions.emptyConsumer(),
Functions.actionConsumer(onTerminate), onTerminate,
Functions.EMPTY_ACTION);
}
/**
* Returns a Maybe that emits the single item at a specified index in a sequence of emissions from
* this Observable or completes if this Observable signals fewer elements than index.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/elementAt.2m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code elementAt} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param index
* the zero-based index of the item to retrieve
* @return a Maybe that emits a single item: the item at the specified position in the sequence of
* those emitted by the source ObservableSource
* @throws IndexOutOfBoundsException
* if {@code index} is less than 0
* @see <a href="http://reactivex.io/documentation/operators/elementat.html">ReactiveX operators documentation: ElementAt</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Maybe<T> elementAt(long index) {
if (index < 0) {
throw new IndexOutOfBoundsException("index >= 0 required but it was " + index);
}
return RxJavaPlugins.onAssembly(new ObservableElementAtMaybe<T>(this, index));
}
/**
* Returns a Single that emits the item found at a specified index in a sequence of emissions from
* this Observable, or a default item if that index is out of range.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/elementAt.2s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code elementAt} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param index
* the zero-based index of the item to retrieve
* @param defaultItem
* the default item
* @return a Single that emits the item at the specified position in the sequence emitted by the source
* ObservableSource, or the default item if that index is outside the bounds of the source sequence
* @throws IndexOutOfBoundsException
* if {@code index} is less than 0
* @see <a href="http://reactivex.io/documentation/operators/elementat.html">ReactiveX operators documentation: ElementAt</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> elementAt(long index, T defaultItem) {
if (index < 0) {
throw new IndexOutOfBoundsException("index >= 0 required but it was " + index);
}
ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
return RxJavaPlugins.onAssembly(new ObservableElementAtSingle<T>(this, index, defaultItem));
}
/**
* Returns a Single that emits the item found at a specified index in a sequence of emissions from this Observable
* or signals a {@link NoSuchElementException} if this Observable signals fewer elements than index.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/elementAt.2s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code elementAtOrError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param index
* the zero-based index of the item to retrieve
* @return a Single that emits the item at the specified position in the sequence emitted by the source
* ObservableSource, or the default item if that index is outside the bounds of the source sequence
* @throws IndexOutOfBoundsException
* if {@code index} is less than 0
* @see <a href="http://reactivex.io/documentation/operators/elementat.html">ReactiveX operators documentation: ElementAt</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> elementAtOrError(long index) {
if (index < 0) {
throw new IndexOutOfBoundsException("index >= 0 required but it was " + index);
}
return RxJavaPlugins.onAssembly(new ObservableElementAtSingle<T>(this, index, null));
}
/**
* Filters items emitted by an ObservableSource by only emitting those that satisfy a specified predicate.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/filter.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code filter} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate
* a function that evaluates each item emitted by the source ObservableSource, returning {@code true}
* if it passes the filter
* @return an Observable that emits only those items emitted by the source ObservableSource that the filter
* evaluates as {@code true}
* @see <a href="http://reactivex.io/documentation/operators/filter.html">ReactiveX operators documentation: Filter</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> filter(Predicate<? super T> predicate) {
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableFilter<T>(this, predicate));
}
/**
* Returns a Maybe that emits only the very first item emitted by the source ObservableSource, or
* completes if the source ObservableSource is empty.
* <p>
* <img width="640" height="237" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/firstElement.m.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code firstElement} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the new Maybe instance
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX operators documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Maybe<T> firstElement() {
return elementAt(0L);
}
/**
* Returns a Single that emits only the very first item emitted by the source ObservableSource, or a default item
* if the source ObservableSource completes without emitting any items.
* <p>
* <img width="640" height="286" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/first.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code first} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* the default item to emit if the source ObservableSource doesn't emit anything
* @return the new Single instance
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX operators documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> first(T defaultItem) {
return elementAt(0L, defaultItem);
}
/**
* Returns a Single that emits only the very first item emitted by this Observable or
* signals a {@link NoSuchElementException} if this Observable is empty.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/first.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code firstOrError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the new Single instance
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX operators documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> firstOrError() {
return elementAtOrError(0L);
}
/**
* Returns an Observable that emits items based on applying a function that you supply to each item emitted
* by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting
* ObservableSources and emitting the results of this merger.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the value type of the inner ObservableSources and the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and merging the results of the ObservableSources obtained from this
* transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
return flatMap(mapper, false);
}
/**
* Returns an Observable that emits items based on applying a function that you supply to each item emitted
* by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting
* ObservableSources and emitting the results of this merger.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the value type of the inner ObservableSources and the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param delayErrors
* if true, exceptions from the current Observable and all inner ObservableSources are delayed until all of them terminate
* if false, the first one signalling an exception will terminate the whole sequence immediately
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and merging the results of the ObservableSources obtained from this
* transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, boolean delayErrors) {
return flatMap(mapper, delayErrors, Integer.MAX_VALUE);
}
/**
* Returns an Observable that emits items based on applying a function that you supply to each item emitted
* by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting
* ObservableSources and emitting the results of this merger, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMap.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the value type of the inner ObservableSources and the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param delayErrors
* if true, exceptions from the current Observable and all inner ObservableSources are delayed until all of them terminate
* if false, the first one signalling an exception will terminate the whole sequence immediately
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and merging the results of the ObservableSources obtained from this
* transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, boolean delayErrors, int maxConcurrency) {
return flatMap(mapper, delayErrors, maxConcurrency, bufferSize());
}
/**
* Returns an Observable that emits items based on applying a function that you supply to each item emitted
* by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting
* ObservableSources and emitting the results of this merger, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMap.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the value type of the inner ObservableSources and the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param delayErrors
* if true, exceptions from the current Observable and all inner ObservableSources are delayed until all of them terminate
* if false, the first one signalling an exception will terminate the whole sequence immediately
* @param bufferSize
* the number of elements to prefetch from each inner ObservableSource
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and merging the results of the ObservableSources obtained from this
* transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper,
boolean delayErrors, int maxConcurrency, int bufferSize) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(maxConcurrency, "maxConcurrency");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
if (this instanceof ScalarCallable) {
@SuppressWarnings("unchecked")
T v = ((ScalarCallable<T>)this).call();
if (v == null) {
return empty();
}
return ObservableScalarXMap.scalarXMap(v, mapper);
}
return RxJavaPlugins.onAssembly(new ObservableFlatMap<T, R>(this, mapper, delayErrors, maxConcurrency, bufferSize));
}
/**
* Returns an Observable that applies a function to each item emitted or notification raised by the source
* ObservableSource and then flattens the ObservableSources returned from these functions and emits the resulting items.
* <p>
* <img width="640" height="410" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.nce.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the result type
* @param onNextMapper
* a function that returns an ObservableSource to merge for each item emitted by the source ObservableSource
* @param onErrorMapper
* a function that returns an ObservableSource to merge for an onError notification from the source
* ObservableSource
* @param onCompleteSupplier
* a function that returns an ObservableSource to merge for an onComplete notification from the source
* ObservableSource
* @return an Observable that emits the results of merging the ObservableSources returned from applying the
* specified functions to the emissions and notifications of the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(
Function<? super T, ? extends ObservableSource<? extends R>> onNextMapper,
Function<? super Throwable, ? extends ObservableSource<? extends R>> onErrorMapper,
Callable<? extends ObservableSource<? extends R>> onCompleteSupplier) {
ObjectHelper.requireNonNull(onNextMapper, "onNextMapper is null");
ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
return merge(new ObservableMapNotification<T, R>(this, onNextMapper, onErrorMapper, onCompleteSupplier));
}
/**
* Returns an Observable that applies a function to each item emitted or notification raised by the source
* ObservableSource and then flattens the ObservableSources returned from these functions and emits the resulting items,
* while limiting the maximum number of concurrent subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="410" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.nce.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the result type
* @param onNextMapper
* a function that returns an ObservableSource to merge for each item emitted by the source ObservableSource
* @param onErrorMapper
* a function that returns an ObservableSource to merge for an onError notification from the source
* ObservableSource
* @param onCompleteSupplier
* a function that returns an ObservableSource to merge for an onComplete notification from the source
* ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits the results of merging the ObservableSources returned from applying the
* specified functions to the emissions and notifications of the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(
Function<? super T, ? extends ObservableSource<? extends R>> onNextMapper,
Function<Throwable, ? extends ObservableSource<? extends R>> onErrorMapper,
Callable<? extends ObservableSource<? extends R>> onCompleteSupplier,
int maxConcurrency) {
ObjectHelper.requireNonNull(onNextMapper, "onNextMapper is null");
ObjectHelper.requireNonNull(onErrorMapper, "onErrorMapper is null");
ObjectHelper.requireNonNull(onCompleteSupplier, "onCompleteSupplier is null");
return merge(new ObservableMapNotification<T, R>(this, onNextMapper, onErrorMapper, onCompleteSupplier), maxConcurrency);
}
/**
* Returns an Observable that emits items based on applying a function that you supply to each item emitted
* by the source ObservableSource, where that function returns an ObservableSource, and then merging those resulting
* ObservableSources and emitting the results of this merger, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMap.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the value type of the inner ObservableSources and the output type
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits the result of applying the transformation function to each item emitted
* by the source ObservableSource and merging the results of the ObservableSources obtained from this
* transformation
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int maxConcurrency) {
return flatMap(mapper, false, maxConcurrency, bufferSize());
}
/**
* Returns an Observable that emits the results of a specified function to the pair of values emitted by the
* source ObservableSource and a specified collection ObservableSource.
* <p>
* <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.r.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the collection ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param mapper
* a function that returns an ObservableSource for each item emitted by the source ObservableSource
* @param resultSelector
* a function that combines one item emitted by each of the source and collection ObservableSources and
* returns an item to be emitted by the resulting ObservableSource
* @return an Observable that emits the results of applying a function to a pair of values emitted by the
* source ObservableSource and the collection ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper,
BiFunction<? super T, ? super U, ? extends R> resultSelector) {
return flatMap(mapper, resultSelector, false, bufferSize(), bufferSize());
}
/**
* Returns an Observable that emits the results of a specified function to the pair of values emitted by the
* source ObservableSource and a specified collection ObservableSource.
* <p>
* <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.r.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the collection ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param mapper
* a function that returns an ObservableSource for each item emitted by the source ObservableSource
* @param combiner
* a function that combines one item emitted by each of the source and collection ObservableSources and
* returns an item to be emitted by the resulting ObservableSource
* @param delayErrors
* if true, exceptions from the current Observable and all inner ObservableSources are delayed until all of them terminate
* if false, the first one signalling an exception will terminate the whole sequence immediately
* @return an Observable that emits the results of applying a function to a pair of values emitted by the
* source ObservableSource and the collection ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper,
BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors) {
return flatMap(mapper, combiner, delayErrors, bufferSize(), bufferSize());
}
/**
* Returns an Observable that emits the results of a specified function to the pair of values emitted by the
* source ObservableSource and a specified collection ObservableSource, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.r.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the collection ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param mapper
* a function that returns an ObservableSource for each item emitted by the source ObservableSource
* @param combiner
* a function that combines one item emitted by each of the source and collection ObservableSources and
* returns an item to be emitted by the resulting ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param delayErrors
* if true, exceptions from the current Observable and all inner ObservableSources are delayed until all of them terminate
* if false, the first one signalling an exception will terminate the whole sequence immediately
* @return an Observable that emits the results of applying a function to a pair of values emitted by the
* source ObservableSource and the collection ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper,
BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors, int maxConcurrency) {
return flatMap(mapper, combiner, delayErrors, maxConcurrency, bufferSize());
}
/**
* Returns an Observable that emits the results of a specified function to the pair of values emitted by the
* source ObservableSource and a specified collection ObservableSource, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.r.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the collection ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param mapper
* a function that returns an ObservableSource for each item emitted by the source ObservableSource
* @param combiner
* a function that combines one item emitted by each of the source and collection ObservableSources and
* returns an item to be emitted by the resulting ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @param delayErrors
* if true, exceptions from the current Observable and all inner ObservableSources are delayed until all of them terminate
* if false, the first one signalling an exception will terminate the whole sequence immediately
* @param bufferSize
* the number of elements to prefetch from the inner ObservableSources.
* @return an Observable that emits the results of applying a function to a pair of values emitted by the
* source ObservableSource and the collection ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> flatMap(final Function<? super T, ? extends ObservableSource<? extends U>> mapper,
final BiFunction<? super T, ? super U, ? extends R> combiner, boolean delayErrors, int maxConcurrency, int bufferSize) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
return flatMap(ObservableInternalHelper.flatMapWithCombiner(mapper, combiner), delayErrors, maxConcurrency, bufferSize);
}
/**
* Returns an Observable that emits the results of a specified function to the pair of values emitted by the
* source ObservableSource and a specified collection ObservableSource, while limiting the maximum number of concurrent
* subscriptions to these ObservableSources.
* <p>
* <!-- <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/mergeMap.r.png" alt=""> -->
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the collection ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param mapper
* a function that returns an ObservableSource for each item emitted by the source ObservableSource
* @param combiner
* a function that combines one item emitted by each of the source and collection ObservableSources and
* returns an item to be emitted by the resulting ObservableSource
* @param maxConcurrency
* the maximum number of ObservableSources that may be subscribed to concurrently
* @return an Observable that emits the results of applying a function to a pair of values emitted by the
* source ObservableSource and the collection ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> flatMap(Function<? super T, ? extends ObservableSource<? extends U>> mapper,
BiFunction<? super T, ? super U, ? extends R> combiner, int maxConcurrency) {
return flatMap(mapper, combiner, false, maxConcurrency, bufferSize());
}
/**
* Maps each element of the upstream Observable into CompletableSources, subscribes to them and
* waits until the upstream and all CompletableSources complete.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapCompletable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param mapper the function that received each source value and transforms them into CompletableSources.
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Completable flatMapCompletable(Function<? super T, ? extends CompletableSource> mapper) {
return flatMapCompletable(mapper, false);
}
/**
* Maps each element of the upstream Observable into CompletableSources, subscribes to them and
* waits until the upstream and all CompletableSources complete, optionally delaying all errors.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapCompletable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param mapper the function that received each source value and transforms them into CompletableSources.
* @param delayErrors if true errors from the upstream and inner CompletableSources are delayed until each of them
* terminates.
* @return the new Completable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Completable flatMapCompletable(Function<? super T, ? extends CompletableSource> mapper, boolean delayErrors) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
return RxJavaPlugins.onAssembly(new ObservableFlatMapCompletableCompletable<T>(this, mapper, delayErrors));
}
/**
* Returns an Observable that merges each item emitted by the source ObservableSource with the values in an
* Iterable corresponding to that item that is generated by a selector.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMapIterable.o.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of item emitted by the resulting Iterable
* @param mapper
* a function that returns an Iterable sequence of values for when given an item emitted by the
* source ObservableSource
* @return an Observable that emits the results of merging the items emitted by the source ObservableSource with
* the values in the Iterables corresponding to those items, as generated by {@code collectionSelector}
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<U> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
return RxJavaPlugins.onAssembly(new ObservableFlattenIterable<T, U>(this, mapper));
}
/**
* Returns an Observable that emits the results of applying a function to the pair of values from the source
* ObservableSource and an Iterable corresponding to that item that is generated by a selector.
* <p>
* <img width="640" height="390" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMapIterable.o.r.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapIterable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the collection element type
* @param <V>
* the type of item emitted by the resulting Iterable
* @param mapper
* a function that returns an Iterable sequence of values for each item emitted by the source
* ObservableSource
* @param resultSelector
* a function that returns an item based on the item emitted by the source ObservableSource and the
* Iterable returned for that item by the {@code collectionSelector}
* @return an Observable that emits the items returned by {@code resultSelector} for each item in the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, V> Observable<V> flatMapIterable(final Function<? super T, ? extends Iterable<? extends U>> mapper,
BiFunction<? super T, ? super U, ? extends V> resultSelector) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
return flatMap(ObservableInternalHelper.flatMapIntoIterable(mapper), resultSelector, false, bufferSize(), bufferSize());
}
/**
* Maps each element of the upstream Observable into MaybeSources, subscribes to them and
* waits until the upstream and all MaybeSources complete.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMapMaybe.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapMaybe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the result value type
* @param mapper the function that received each source value and transforms them into MaybeSources.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper) {
return flatMapMaybe(mapper, false);
}
/**
* Maps each element of the upstream Observable into MaybeSources, subscribes to them and
* waits until the upstream and all MaybeSources complete, optionally delaying all errors.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMapMaybe.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapMaybe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the result value type
* @param mapper the function that received each source value and transforms them into MaybeSources.
* @param delayErrors if true errors from the upstream and inner MaybeSources are delayed until each of them
* terminates.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMapMaybe(Function<? super T, ? extends MaybeSource<? extends R>> mapper, boolean delayErrors) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
return RxJavaPlugins.onAssembly(new ObservableFlatMapMaybe<T, R>(this, mapper, delayErrors));
}
/**
* Maps each element of the upstream Observable into SingleSources, subscribes to them and
* waits until the upstream and all SingleSources complete.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMapSingle.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapSingle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the result value type
* @param mapper the function that received each source value and transforms them into SingleSources.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper) {
return flatMapSingle(mapper, false);
}
/**
* Maps each element of the upstream Observable into SingleSources, subscribes to them and
* waits until the upstream and all SingleSources complete, optionally delaying all errors.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/flatMapSingle.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code flatMapSingle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the result value type
* @param mapper the function that received each source value and transforms them into SingleSources.
* @param delayErrors if true errors from the upstream and inner SingleSources are delayed until each of them
* terminates.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> flatMapSingle(Function<? super T, ? extends SingleSource<? extends R>> mapper, boolean delayErrors) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
return RxJavaPlugins.onAssembly(new ObservableFlatMapSingle<T, R>(this, mapper, delayErrors));
}
/**
* Subscribes to the {@link ObservableSource} and receives notifications for each element.
* <p>
* Alias to {@link #subscribe(Consumer)}
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code forEach} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* {@link Consumer} to execute for each item.
* @return
* a Disposable that allows cancelling an asynchronous sequence
* @throws NullPointerException
* if {@code onNext} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable forEach(Consumer<? super T> onNext) {
return subscribe(onNext);
}
/**
* Subscribes to the {@link ObservableSource} and receives notifications for each element until the
* onNext Predicate returns false.
* <p>
* If the Observable emits an error, it is wrapped into an
* {@link io.reactivex.exceptions.OnErrorNotImplementedException OnErrorNotImplementedException}
* and routed to the RxJavaPlugins.onError handler.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code forEachWhile} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* {@link Predicate} to execute for each item.
* @return
* a Disposable that allows cancelling an asynchronous sequence
* @throws NullPointerException
* if {@code onNext} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable forEachWhile(Predicate<? super T> onNext) {
return forEachWhile(onNext, Functions.ON_ERROR_MISSING, Functions.EMPTY_ACTION);
}
/**
* Subscribes to the {@link ObservableSource} and receives notifications for each element and error events until the
* onNext Predicate returns false.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code forEachWhile} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* {@link Predicate} to execute for each item.
* @param onError
* {@link Consumer} to execute when an error is emitted.
* @return
* a Disposable that allows cancelling an asynchronous sequence
* @throws NullPointerException
* if {@code onNext} is null, or
* if {@code onError} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable forEachWhile(Predicate<? super T> onNext, Consumer<? super Throwable> onError) {
return forEachWhile(onNext, onError, Functions.EMPTY_ACTION);
}
/**
* Subscribes to the {@link ObservableSource} and receives notifications for each element and the terminal events until the
* onNext Predicate returns false.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code forEachWhile} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* {@link Predicate} to execute for each item.
* @param onError
* {@link Consumer} to execute when an error is emitted.
* @param onComplete
* {@link Action} to execute when completion is signalled.
* @return
* a Disposable that allows cancelling an asynchronous sequence
* @throws NullPointerException
* if {@code onNext} is null, or
* if {@code onError} is null, or
* if {@code onComplete} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable forEachWhile(final Predicate<? super T> onNext, Consumer<? super Throwable> onError,
final Action onComplete) {
ObjectHelper.requireNonNull(onNext, "onNext is null");
ObjectHelper.requireNonNull(onError, "onError is null");
ObjectHelper.requireNonNull(onComplete, "onComplete is null");
ForEachWhileObserver<T> o = new ForEachWhileObserver<T>(onNext, onError, onComplete);
subscribe(o);
return o;
}
/**
* Groups the items emitted by an {@code ObservableSource} according to a specified criterion, and emits these
* grouped items as {@link GroupedObservable}s. The emitted {@code GroupedObservableSource} allows only a single
* {@link Observer} during its lifetime and if this {@code Observer} calls dispose() before the
* source terminates, the next emission by the source having the same key will trigger a new
* {@code GroupedObservableSource} emission.
* <p>
* <img width="640" height="360" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/groupBy.png" alt="">
* <p>
* <em>Note:</em> A {@link GroupedObservable} will cache the items it is to emit until such time as it
* is subscribed to. For this reason, in order to avoid memory leaks, you should not simply ignore those
* {@code GroupedObservableSource}s that do not concern you. Instead, you can signal to them that they may
* discard their buffers by applying an operator like {@link #ignoreElements} to them.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code groupBy} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param keySelector
* a function that extracts the key for each item
* @param <K>
* the key type
* @return an {@code ObservableSource} that emits {@link GroupedObservable}s, each of which corresponds to a
* unique key value and each of which emits those items from the source ObservableSource that share that
* key value
* @see <a href="http://reactivex.io/documentation/operators/groupby.html">ReactiveX operators documentation: GroupBy</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Observable<GroupedObservable<K, T>> groupBy(Function<? super T, ? extends K> keySelector) {
return groupBy(keySelector, (Function)Functions.identity(), false, bufferSize());
}
/**
* Groups the items emitted by an {@code ObservableSource} according to a specified criterion, and emits these
* grouped items as {@link GroupedObservable}s. The emitted {@code GroupedObservableSource} allows only a single
* {@link Observer} during its lifetime and if this {@code Observer} calls dispose() before the
* source terminates, the next emission by the source having the same key will trigger a new
* {@code GroupedObservableSource} emission.
* <p>
* <img width="640" height="360" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/groupBy.png" alt="">
* <p>
* <em>Note:</em> A {@link GroupedObservable} will cache the items it is to emit until such time as it
* is subscribed to. For this reason, in order to avoid memory leaks, you should not simply ignore those
* {@code GroupedObservableSource}s that do not concern you. Instead, you can signal to them that they may
* discard their buffers by applying an operator like {@link #ignoreElements} to them.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code groupBy} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param keySelector
* a function that extracts the key for each item
* @param <K>
* the key type
* @param delayError
* if true, the exception from the current Observable is delayed in each group until that specific group emitted
* the normal values; if false, the exception bypasses values in the groups and is reported immediately.
* @return an {@code ObservableSource} that emits {@link GroupedObservable}s, each of which corresponds to a
* unique key value and each of which emits those items from the source ObservableSource that share that
* key value
* @see <a href="http://reactivex.io/documentation/operators/groupby.html">ReactiveX operators documentation: GroupBy</a>
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Observable<GroupedObservable<K, T>> groupBy(Function<? super T, ? extends K> keySelector, boolean delayError) {
return groupBy(keySelector, (Function)Functions.identity(), delayError, bufferSize());
}
/**
* Groups the items emitted by an {@code ObservableSource} according to a specified criterion, and emits these
* grouped items as {@link GroupedObservable}s. The emitted {@code GroupedObservableSource} allows only a single
* {@link Observer} during its lifetime and if this {@code Observer} calls dispose() before the
* source terminates, the next emission by the source having the same key will trigger a new
* {@code GroupedObservableSource} emission.
* <p>
* <img width="640" height="360" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/groupBy.png" alt="">
* <p>
* <em>Note:</em> A {@link GroupedObservable} will cache the items it is to emit until such time as it
* is subscribed to. For this reason, in order to avoid memory leaks, you should not simply ignore those
* {@code GroupedObservableSource}s that do not concern you. Instead, you can signal to them that they may
* discard their buffers by applying an operator like {@link #ignoreElements} to them.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code groupBy} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param keySelector
* a function that extracts the key for each item
* @param valueSelector
* a function that extracts the return element for each item
* @param <K>
* the key type
* @param <V>
* the element type
* @return an {@code ObservableSource} that emits {@link GroupedObservable}s, each of which corresponds to a
* unique key value and each of which emits those items from the source ObservableSource that share that
* key value
* @see <a href="http://reactivex.io/documentation/operators/groupby.html">ReactiveX operators documentation: GroupBy</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Observable<GroupedObservable<K, V>> groupBy(Function<? super T, ? extends K> keySelector,
Function<? super T, ? extends V> valueSelector) {
return groupBy(keySelector, valueSelector, false, bufferSize());
}
/**
* Groups the items emitted by an {@code ObservableSource} according to a specified criterion, and emits these
* grouped items as {@link GroupedObservable}s. The emitted {@code GroupedObservableSource} allows only a single
* {@link Observer} during its lifetime and if this {@code Observer} calls dispose() before the
* source terminates, the next emission by the source having the same key will trigger a new
* {@code GroupedObservableSource} emission.
* <p>
* <img width="640" height="360" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/groupBy.png" alt="">
* <p>
* <em>Note:</em> A {@link GroupedObservable} will cache the items it is to emit until such time as it
* is subscribed to. For this reason, in order to avoid memory leaks, you should not simply ignore those
* {@code GroupedObservableSource}s that do not concern you. Instead, you can signal to them that they may
* discard their buffers by applying an operator like {@link #ignoreElements} to them.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code groupBy} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param keySelector
* a function that extracts the key for each item
* @param valueSelector
* a function that extracts the return element for each item
* @param <K>
* the key type
* @param <V>
* the element type
* @param delayError
* if true, the exception from the current Observable is delayed in each group until that specific group emitted
* the normal values; if false, the exception bypasses values in the groups and is reported immediately.
* @return an {@code ObservableSource} that emits {@link GroupedObservable}s, each of which corresponds to a
* unique key value and each of which emits those items from the source ObservableSource that share that
* key value
* @see <a href="http://reactivex.io/documentation/operators/groupby.html">ReactiveX operators documentation: GroupBy</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Observable<GroupedObservable<K, V>> groupBy(Function<? super T, ? extends K> keySelector,
Function<? super T, ? extends V> valueSelector, boolean delayError) {
return groupBy(keySelector, valueSelector, delayError, bufferSize());
}
/**
* Groups the items emitted by an {@code ObservableSource} according to a specified criterion, and emits these
* grouped items as {@link GroupedObservable}s. The emitted {@code GroupedObservableSource} allows only a single
* {@link Observer} during its lifetime and if this {@code Observer} calls dispose() before the
* source terminates, the next emission by the source having the same key will trigger a new
* {@code GroupedObservableSource} emission.
* <p>
* <img width="640" height="360" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/groupBy.png" alt="">
* <p>
* <em>Note:</em> A {@link GroupedObservable} will cache the items it is to emit until such time as it
* is subscribed to. For this reason, in order to avoid memory leaks, you should not simply ignore those
* {@code GroupedObservableSource}s that do not concern you. Instead, you can signal to them that they may
* discard their buffers by applying an operator like {@link #ignoreElements} to them.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code groupBy} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param keySelector
* a function that extracts the key for each item
* @param valueSelector
* a function that extracts the return element for each item
* @param delayError
* if true, the exception from the current Observable is delayed in each group until that specific group emitted
* the normal values; if false, the exception bypasses values in the groups and is reported immediately.
* @param bufferSize
* the hint for how many {@link GroupedObservable}s and element in each {@link GroupedObservable} should be buffered
* @param <K>
* the key type
* @param <V>
* the element type
* @return an {@code ObservableSource} that emits {@link GroupedObservable}s, each of which corresponds to a
* unique key value and each of which emits those items from the source ObservableSource that share that
* key value
* @see <a href="http://reactivex.io/documentation/operators/groupby.html">ReactiveX operators documentation: GroupBy</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Observable<GroupedObservable<K, V>> groupBy(Function<? super T, ? extends K> keySelector,
Function<? super T, ? extends V> valueSelector,
boolean delayError, int bufferSize) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableGroupBy<T, K, V>(this, keySelector, valueSelector, bufferSize, delayError));
}
/**
* Returns an Observable that correlates two ObservableSources when they overlap in time and groups the results.
* <p>
* There are no guarantees in what order the items get combined when multiple
* items from one or both source ObservableSources overlap.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/groupJoin.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code groupJoin} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <TRight> the value type of the right ObservableSource source
* @param <TLeftEnd> the element type of the left duration ObservableSources
* @param <TRightEnd> the element type of the right duration ObservableSources
* @param <R> the result type
* @param other
* the other ObservableSource to correlate items from the source ObservableSource with
* @param leftEnd
* a function that returns an ObservableSource whose emissions indicate the duration of the values of
* the source ObservableSource
* @param rightEnd
* a function that returns an ObservableSource whose emissions indicate the duration of the values of
* the {@code right} ObservableSource
* @param resultSelector
* a function that takes an item emitted by each ObservableSource and returns the value to be emitted
* by the resulting ObservableSource
* @return an Observable that emits items based on combining those items emitted by the source ObservableSources
* whose durations overlap
* @see <a href="http://reactivex.io/documentation/operators/join.html">ReactiveX operators documentation: Join</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <TRight, TLeftEnd, TRightEnd, R> Observable<R> groupJoin(
ObservableSource<? extends TRight> other,
Function<? super T, ? extends ObservableSource<TLeftEnd>> leftEnd,
Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd,
BiFunction<? super T, ? super Observable<TRight>, ? extends R> resultSelector
) {
ObjectHelper.requireNonNull(other, "other is null");
ObjectHelper.requireNonNull(leftEnd, "leftEnd is null");
ObjectHelper.requireNonNull(rightEnd, "rightEnd is null");
ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
return RxJavaPlugins.onAssembly(new ObservableGroupJoin<T, TRight, TLeftEnd, TRightEnd, R>(
this, other, leftEnd, rightEnd, resultSelector));
}
/**
* Hides the identity of this Observable and its Disposable.
* <p>Allows hiding extra features such as {@link io.reactivex.subjects.Subject}'s
* {@link Observer} methods or preventing certain identity-based
* optimizations (fusion).
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code hide} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return the new Observable instance
*
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> hide() {
return RxJavaPlugins.onAssembly(new ObservableHide<T>(this));
}
/**
* Ignores all items emitted by the source ObservableSource and only calls {@code onComplete} or {@code onError}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/ignoreElements.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code ignoreElements} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the new Completable instance
* @see <a href="http://reactivex.io/documentation/operators/ignoreelements.html">ReactiveX operators documentation: IgnoreElements</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Completable ignoreElements() {
return RxJavaPlugins.onAssembly(new ObservableIgnoreElementsCompletable<T>(this));
}
/**
* Returns an Observable that emits {@code true} if the source ObservableSource is empty, otherwise {@code false}.
* <p>
* In Rx.Net this is negated as the {@code any} Observer but we renamed this in RxJava to better match Java
* naming idioms.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/isEmpty.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code isEmpty} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a Single that emits a Boolean
* @see <a href="http://reactivex.io/documentation/operators/contains.html">ReactiveX operators documentation: Contains</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<Boolean> isEmpty() {
return all(Functions.alwaysFalse());
}
/**
* Correlates the items emitted by two ObservableSources based on overlapping durations.
* <p>
* There are no guarantees in what order the items get combined when multiple
* items from one or both source ObservableSources overlap.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/join_.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code join} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <TRight> the value type of the right ObservableSource source
* @param <TLeftEnd> the element type of the left duration ObservableSources
* @param <TRightEnd> the element type of the right duration ObservableSources
* @param <R> the result type
* @param other
* the second ObservableSource to join items from
* @param leftEnd
* a function to select a duration for each item emitted by the source ObservableSource, used to
* determine overlap
* @param rightEnd
* a function to select a duration for each item emitted by the {@code right} ObservableSource, used to
* determine overlap
* @param resultSelector
* a function that computes an item to be emitted by the resulting ObservableSource for any two
* overlapping items emitted by the two ObservableSources
* @return an Observable that emits items correlating to items emitted by the source ObservableSources that have
* overlapping durations
* @see <a href="http://reactivex.io/documentation/operators/join.html">ReactiveX operators documentation: Join</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <TRight, TLeftEnd, TRightEnd, R> Observable<R> join(
ObservableSource<? extends TRight> other,
Function<? super T, ? extends ObservableSource<TLeftEnd>> leftEnd,
Function<? super TRight, ? extends ObservableSource<TRightEnd>> rightEnd,
BiFunction<? super T, ? super TRight, ? extends R> resultSelector
) {
ObjectHelper.requireNonNull(other, "other is null");
ObjectHelper.requireNonNull(leftEnd, "leftEnd is null");
ObjectHelper.requireNonNull(rightEnd, "rightEnd is null");
ObjectHelper.requireNonNull(resultSelector, "resultSelector is null");
return RxJavaPlugins.onAssembly(new ObservableJoin<T, TRight, TLeftEnd, TRightEnd, R>(
this, other, leftEnd, rightEnd, resultSelector));
}
/**
* Returns a Maybe that emits the last item emitted by this Observable or
* completes if this Observable is empty.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/lastElement.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code lastElement} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a Maybe that emits the last item from the source ObservableSource or notifies observers of an
* error
* @see <a href="http://reactivex.io/documentation/operators/last.html">ReactiveX operators documentation: Last</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Maybe<T> lastElement() {
return RxJavaPlugins.onAssembly(new ObservableLastMaybe<T>(this));
}
/**
* Returns a Single that emits only the last item emitted by this Observable, or a default item
* if this Observable completes without emitting any items.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/last.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code last} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* the default item to emit if the source ObservableSource is empty
* @return an Observable that emits only the last item emitted by the source ObservableSource, or a default item
* if the source ObservableSource is empty
* @see <a href="http://reactivex.io/documentation/operators/last.html">ReactiveX operators documentation: Last</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> last(T defaultItem) {
ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
return RxJavaPlugins.onAssembly(new ObservableLastSingle<T>(this, defaultItem));
}
/**
* Returns a Single that emits only the last item emitted by this Observable or
* signals a {@link NoSuchElementException} if this Observable is empty.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/last.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code lastOrError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a Single that emits only the last item emitted by the source ObservableSource.
* If the source ObservableSource completes without emitting any items a {@link NoSuchElementException} will be thrown.
* @see <a href="http://reactivex.io/documentation/operators/last.html">ReactiveX operators documentation: Last</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> lastOrError() {
return RxJavaPlugins.onAssembly(new ObservableLastSingle<T>(this, null));
}
/**
* <strong>This method requires advanced knowledge about building operators; please consider
* other standard composition methods first;</strong>
* Lifts a function to the current ObservableSource and returns a new ObservableSource that when subscribed to will pass
* the values of the current ObservableSource through the Operator function.
* <p>
* In other words, this allows chaining Observers together on an ObservableSource for acting on the values within
* the ObservableSource.
* <p> {@code
* ObservableSource.map(...).filter(...).take(5).lift(new OperatorA()).lift(new OperatorB(...)).subscribe()
* }
* <p>
* If the operator you are creating is designed to act on the individual items emitted by a source
* ObservableSource, use {@code lift}. If your operator is designed to transform the source ObservableSource as a whole
* (for instance, by applying a particular set of existing RxJava operators to it) use {@link #compose}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code lift} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the output value type
* @param lifter the Operator that implements the ObservableSource-operating function to be applied to the source
* ObservableSource
* @return an Observable that is the result of applying the lifted Operator to the source ObservableSource
* @see <a href="https://github.com/ReactiveX/RxJava/wiki/Implementing-Your-Own-Operators">RxJava wiki: Implementing Your Own Operators</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> lift(ObservableOperator<? extends R, ? super T> lifter) {
ObjectHelper.requireNonNull(lifter, "onLift is null");
return RxJavaPlugins.onAssembly(new ObservableLift<R, T>(this, lifter));
}
/**
* Returns an Observable that applies a specified function to each item emitted by the source ObservableSource and
* emits the results of these function applications.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/map.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code map} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the output type
* @param mapper
* a function to apply to each item emitted by the ObservableSource
* @return an Observable that emits the items from the source ObservableSource, transformed by the specified
* function
* @see <a href="http://reactivex.io/documentation/operators/map.html">ReactiveX operators documentation: Map</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> map(Function<? super T, ? extends R> mapper) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
return RxJavaPlugins.onAssembly(new ObservableMap<T, R>(this, mapper));
}
/**
* Returns an Observable that represents all of the emissions <em>and</em> notifications from the source
* ObservableSource into emissions marked with their original types within {@link Notification} objects.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/materialize.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code materialize} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that emits items that are the result of materializing the items and notifications
* of the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/materialize-dematerialize.html">ReactiveX operators documentation: Materialize</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Notification<T>> materialize() {
return RxJavaPlugins.onAssembly(new ObservableMaterialize<T>(this));
}
/**
* Flattens this and another ObservableSource into a single ObservableSource, without any transformation.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/merge.png" alt="">
* <p>
* You can combine items emitted by multiple ObservableSources so that they appear as a single ObservableSource, by
* using the {@code mergeWith} method.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code mergeWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param other
* an ObservableSource to be merged
* @return an Observable that emits all of the items emitted by the source ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/merge.html">ReactiveX operators documentation: Merge</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> mergeWith(ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return merge(this, other);
}
/**
* Modifies an ObservableSource to perform its emissions and notifications on a specified {@link Scheduler},
* asynchronously with an unbounded buffer with {@link Flowable#bufferSize()} "island size".
*
* <p>Note that onError notifications will cut ahead of onNext notifications on the emission thread if Scheduler is truly
* asynchronous. If strict event ordering is required, consider using the {@link #observeOn(Scheduler, boolean)} overload.
* <p>
* <img width="640" height="308" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/observeOn.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
* <p>"Island size" indicates how large chunks the unbounded buffer allocates to store the excess elements waiting to be consumed
* on the other side of the asynchronous boundary.
*
* @param scheduler
* the {@link Scheduler} to notify {@link Observer}s on
* @return the source ObservableSource modified so that its {@link Observer}s are notified on the specified
* {@link Scheduler}
* @see <a href="http://reactivex.io/documentation/operators/observeon.html">ReactiveX operators documentation: ObserveOn</a>
* @see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
* @see #subscribeOn
* @see #observeOn(Scheduler, boolean)
* @see #observeOn(Scheduler, boolean, int)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> observeOn(Scheduler scheduler) {
return observeOn(scheduler, false, bufferSize());
}
/**
* Modifies an ObservableSource to perform its emissions and notifications on a specified {@link Scheduler},
* asynchronously with an unbounded buffer with {@link Flowable#bufferSize()} "island size" and optionally delays onError notifications.
* <p>
* <img width="640" height="308" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/observeOn.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
* <p>"Island size" indicates how large chunks the unbounded buffer allocates to store the excess elements waiting to be consumed
* on the other side of the asynchronous boundary.
*
* @param scheduler
* the {@link Scheduler} to notify {@link Observer}s on
* @param delayError
* indicates if the onError notification may not cut ahead of onNext notification on the other side of the
* scheduling boundary. If true a sequence ending in onError will be replayed in the same order as was received
* from upstream
* @return the source ObservableSource modified so that its {@link Observer}s are notified on the specified
* {@link Scheduler}
* @see <a href="http://reactivex.io/documentation/operators/observeon.html">ReactiveX operators documentation: ObserveOn</a>
* @see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
* @see #subscribeOn
* @see #observeOn(Scheduler)
* @see #observeOn(Scheduler, boolean, int)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> observeOn(Scheduler scheduler, boolean delayError) {
return observeOn(scheduler, delayError, bufferSize());
}
/**
* Modifies an ObservableSource to perform its emissions and notifications on a specified {@link Scheduler},
* asynchronously with an unbounded buffer of configurable "island size" and optionally delays onError notifications.
* <p>
* <img width="640" height="308" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/observeOn.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
* <p>"Island size" indicates how large chunks the unbounded buffer allocates to store the excess elements waiting to be consumed
* on the other side of the asynchronous boundary. Values below 16 are not recommended in performance sensitive scenarios.
*
* @param scheduler
* the {@link Scheduler} to notify {@link Observer}s on
* @param delayError
* indicates if the onError notification may not cut ahead of onNext notification on the other side of the
* scheduling boundary. If true a sequence ending in onError will be replayed in the same order as was received
* from upstream
* @param bufferSize the size of the buffer.
* @return the source ObservableSource modified so that its {@link Observer}s are notified on the specified
* {@link Scheduler}
* @see <a href="http://reactivex.io/documentation/operators/observeon.html">ReactiveX operators documentation: ObserveOn</a>
* @see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
* @see #subscribeOn
* @see #observeOn(Scheduler)
* @see #observeOn(Scheduler, boolean)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> observeOn(Scheduler scheduler, boolean delayError, int bufferSize) {
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableObserveOn<T>(this, scheduler, delayError, bufferSize));
}
/**
* Filters the items emitted by an ObservableSource, only emitting those of the specified type.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/ofClass.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code ofType} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the output type
* @param clazz
* the class type to filter the items emitted by the source ObservableSource
* @return an Observable that emits items from the source ObservableSource of type {@code clazz}
* @see <a href="http://reactivex.io/documentation/operators/filter.html">ReactiveX operators documentation: Filter</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<U> ofType(final Class<U> clazz) {
ObjectHelper.requireNonNull(clazz, "clazz is null");
return filter(Functions.isInstanceOf(clazz)).cast(clazz);
}
/**
* Instructs an ObservableSource to pass control to another ObservableSource rather than invoking
* {@link Observer#onError onError} if it encounters an error.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onErrorResumeNext.png" alt="">
* <p>
* By default, when an ObservableSource encounters an error that prevents it from emitting the expected item to
* its {@link Observer}, the ObservableSource invokes its Observer's {@code onError} method, and then quits
* without invoking any more of its Observer's methods. The {@code onErrorResumeNext} method changes this
* behavior. If you pass a function that returns an ObservableSource ({@code resumeFunction}) to
* {@code onErrorResumeNext}, if the original ObservableSource encounters an error, instead of invoking its
* Observer's {@code onError} method, it will instead relinquish control to the ObservableSource returned from
* {@code resumeFunction}, which will invoke the Observer's {@link Observer#onNext onNext} method if it is
* able to do so. In such a case, because no ObservableSource necessarily invokes {@code onError}, the Observer
* may never know that an error happened.
* <p>
* You can use this to prevent errors from propagating or to supply fallback data should errors be
* encountered.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code onErrorResumeNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param resumeFunction
* a function that returns an ObservableSource that will take over if the source ObservableSource encounters
* an error
* @return the original ObservableSource, with appropriately modified behavior
* @see <a href="http://reactivex.io/documentation/operators/catch.html">ReactiveX operators documentation: Catch</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> onErrorResumeNext(Function<? super Throwable, ? extends ObservableSource<? extends T>> resumeFunction) {
ObjectHelper.requireNonNull(resumeFunction, "resumeFunction is null");
return RxJavaPlugins.onAssembly(new ObservableOnErrorNext<T>(this, resumeFunction, false));
}
/**
* Instructs an ObservableSource to pass control to another ObservableSource rather than invoking
* {@link Observer#onError onError} if it encounters an error.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onErrorResumeNext.png" alt="">
* <p>
* By default, when an ObservableSource encounters an error that prevents it from emitting the expected item to
* its {@link Observer}, the ObservableSource invokes its Observer's {@code onError} method, and then quits
* without invoking any more of its Observer's methods. The {@code onErrorResumeNext} method changes this
* behavior. If you pass another ObservableSource ({@code resumeSequence}) to an ObservableSource's
* {@code onErrorResumeNext} method, if the original ObservableSource encounters an error, instead of invoking its
* Observer's {@code onError} method, it will instead relinquish control to {@code resumeSequence} which
* will invoke the Observer's {@link Observer#onNext onNext} method if it is able to do so. In such a case,
* because no ObservableSource necessarily invokes {@code onError}, the Observer may never know that an error
* happened.
* <p>
* You can use this to prevent errors from propagating or to supply fallback data should errors be
* encountered.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code onErrorResumeNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param next
* the next ObservableSource source that will take over if the source ObservableSource encounters
* an error
* @return the original ObservableSource, with appropriately modified behavior
* @see <a href="http://reactivex.io/documentation/operators/catch.html">ReactiveX operators documentation: Catch</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> onErrorResumeNext(final ObservableSource<? extends T> next) {
ObjectHelper.requireNonNull(next, "next is null");
return onErrorResumeNext(Functions.justFunction(next));
}
/**
* Instructs an ObservableSource to emit an item (returned by a specified function) rather than invoking
* {@link Observer#onError onError} if it encounters an error.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onErrorReturn.png" alt="">
* <p>
* By default, when an ObservableSource encounters an error that prevents it from emitting the expected item to
* its {@link Observer}, the ObservableSource invokes its Observer's {@code onError} method, and then quits
* without invoking any more of its Observer's methods. The {@code onErrorReturn} method changes this
* behavior. If you pass a function ({@code resumeFunction}) to an ObservableSource's {@code onErrorReturn}
* method, if the original ObservableSource encounters an error, instead of invoking its Observer's
* {@code onError} method, it will instead emit the return value of {@code resumeFunction}.
* <p>
* You can use this to prevent errors from propagating or to supply fallback data should errors be
* encountered.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code onErrorReturn} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param valueSupplier
* a function that returns a single value that will be emitted along with a regular onComplete in case
* the current Observable signals an onError event
* @return the original ObservableSource with appropriately modified behavior
* @see <a href="http://reactivex.io/documentation/operators/catch.html">ReactiveX operators documentation: Catch</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> onErrorReturn(Function<? super Throwable, ? extends T> valueSupplier) {
ObjectHelper.requireNonNull(valueSupplier, "valueSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableOnErrorReturn<T>(this, valueSupplier));
}
/**
* Instructs an ObservableSource to emit an item (returned by a specified function) rather than invoking
* {@link Observer#onError onError} if it encounters an error.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onErrorReturn.png" alt="">
* <p>
* By default, when an ObservableSource encounters an error that prevents it from emitting the expected item to
* its {@link Observer}, the ObservableSource invokes its Observer's {@code onError} method, and then quits
* without invoking any more of its Observer's methods. The {@code onErrorReturn} method changes this
* behavior. If you pass a function ({@code resumeFunction}) to an ObservableSource's {@code onErrorReturn}
* method, if the original ObservableSource encounters an error, instead of invoking its Observer's
* {@code onError} method, it will instead emit the return value of {@code resumeFunction}.
* <p>
* You can use this to prevent errors from propagating or to supply fallback data should errors be
* encountered.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code onErrorReturnItem} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item
* the value that is emitted along with a regular onComplete in case the current
* Observable signals an exception
* @return the original ObservableSource with appropriately modified behavior
* @see <a href="http://reactivex.io/documentation/operators/catch.html">ReactiveX operators documentation: Catch</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> onErrorReturnItem(final T item) {
ObjectHelper.requireNonNull(item, "item is null");
return onErrorReturn(Functions.justFunction(item));
}
/**
* Instructs an ObservableSource to pass control to another ObservableSource rather than invoking
* {@link Observer#onError onError} if it encounters an {@link java.lang.Exception}.
* <p>
* This differs from {@link #onErrorResumeNext} in that this one does not handle {@link java.lang.Throwable}
* or {@link java.lang.Error} but lets those continue through.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/onExceptionResumeNextViaObservableSource.png" alt="">
* <p>
* By default, when an ObservableSource encounters an exception that prevents it from emitting the expected item
* to its {@link Observer}, the ObservableSource invokes its Observer's {@code onError} method, and then quits
* without invoking any more of its Observer's methods. The {@code onExceptionResumeNext} method changes
* this behavior. If you pass another ObservableSource ({@code resumeSequence}) to an ObservableSource's
* {@code onExceptionResumeNext} method, if the original ObservableSource encounters an exception, instead of
* invoking its Observer's {@code onError} method, it will instead relinquish control to
* {@code resumeSequence} which will invoke the Observer's {@link Observer#onNext onNext} method if it is
* able to do so. In such a case, because no ObservableSource necessarily invokes {@code onError}, the Observer
* may never know that an exception happened.
* <p>
* You can use this to prevent exceptions from propagating or to supply fallback data should exceptions be
* encountered.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code onExceptionResumeNext} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param next
* the next ObservableSource that will take over if the source ObservableSource encounters
* an exception
* @return the original ObservableSource, with appropriately modified behavior
* @see <a href="http://reactivex.io/documentation/operators/catch.html">ReactiveX operators documentation: Catch</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> onExceptionResumeNext(final ObservableSource<? extends T> next) {
ObjectHelper.requireNonNull(next, "next is null");
return RxJavaPlugins.onAssembly(new ObservableOnErrorNext<T>(this, Functions.justFunction(next), true));
}
/**
* Nulls out references to the upstream producer and downstream Observer if
* the sequence is terminated or downstream calls dispose().
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code onTerminateDetach} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return an Observable which out references to the upstream producer and downstream Observer if
* the sequence is terminated or downstream calls dispose()
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> onTerminateDetach() {
return RxJavaPlugins.onAssembly(new ObservableDetach<T>(this));
}
/**
* Returns a {@link ConnectableObservable}, which is a variety of ObservableSource that waits until its
* {@link ConnectableObservable#connect connect} method is called before it begins emitting items to those
* {@link Observer}s that have subscribed to it.
* <p>
* <img width="640" height="510" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/publishConnect.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code publish} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a {@link ConnectableObservable} that upon connection causes the source ObservableSource to emit items
* to its {@link Observer}s
* @see <a href="http://reactivex.io/documentation/operators/publish.html">ReactiveX operators documentation: Publish</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final ConnectableObservable<T> publish() {
return ObservablePublish.create(this);
}
/**
* Returns an Observable that emits the results of invoking a specified selector on items emitted by a
* {@link ConnectableObservable} that shares a single subscription to the underlying sequence.
* <p>
* <img width="640" height="510" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/publishConnect.f.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code publish} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a function that can use the multicasted source sequence as many times as needed, without
* causing multiple subscriptions to the source sequence. Observers to the given source will
* receive all notifications of the source from the time of the subscription forward.
* @return an Observable that emits the results of invoking the selector on the items emitted by a {@link ConnectableObservable} that shares a single subscription to the underlying sequence
* @see <a href="http://reactivex.io/documentation/operators/publish.html">ReactiveX operators documentation: Publish</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> publish(Function<? super Observable<T>, ? extends ObservableSource<R>> selector) {
ObjectHelper.requireNonNull(selector, "selector is null");
return RxJavaPlugins.onAssembly(new ObservablePublishSelector<T, R>(this, selector));
}
/**
* Returns a Maybe that applies a specified accumulator function to the first item emitted by a source
* ObservableSource, then feeds the result of that function along with the second item emitted by the source
* ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource,
* and emits the final result from the final call to your function as its sole item.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/reduce.2.png" alt="">
* <p>
* This technique, which is called "reduce" here, is sometimes called "aggregate," "fold," "accumulate,"
* "compress," or "inject" in other programming contexts. Groovy, for instance, has an {@code inject} method
* that does a similar operation on lists.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code reduce} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param reducer
* an accumulator function to be invoked on each item emitted by the source ObservableSource, whose
* result will be used in the next accumulator call
* @return a Maybe that emits a single item that is the result of accumulating the items emitted by
* the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/reduce.html">ReactiveX operators documentation: Reduce</a>
* @see <a href="http://en.wikipedia.org/wiki/Fold_(higher-order_function)">Wikipedia: Fold (higher-order function)</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Maybe<T> reduce(BiFunction<T, T, T> reducer) {
ObjectHelper.requireNonNull(reducer, "reducer is null");
return RxJavaPlugins.onAssembly(new ObservableReduceMaybe<T>(this, reducer));
}
/**
* Returns an Observable that applies a specified accumulator function to the first item emitted by a source
* ObservableSource and a specified seed value, then feeds the result of that function along with the second item
* emitted by an ObservableSource into the same function, and so on until all items have been emitted by the
* source ObservableSource, emitting the final result from the final call to your function as its sole item.
* <p>
* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/reduceSeed.2.png" alt="">
* <p>
* This technique, which is called "reduce" here, is sometimes called "aggregate," "fold," "accumulate,"
* "compress," or "inject" in other programming contexts. Groovy, for instance, has an {@code inject} method
* that does a similar operation on lists.
* <p>
* Note that the {@code initialValue} is shared among all subscribers to the resulting ObservableSource
* and may cause problems if it is mutable. To make sure each subscriber gets its own value, defer
* the application of this operator via {@link #defer(Callable)}:
* <pre><code>
* ObservableSource<T> source = ...
* Observable.defer(() -> source.reduce(new ArrayList<>(), (list, item) -> list.add(item)));
*
* // alternatively, by using compose to stay fluent
*
* source.compose(o ->
* Observable.defer(() -> o.reduce(new ArrayList<>(), (list, item) -> list.add(item)))
* );
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code reduce} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the accumulator and output value type
* @param seed
* the initial (seed) accumulator value
* @param reducer
* an accumulator function to be invoked on each item emitted by the source ObservableSource, the
* result of which will be used in the next accumulator call
* @return an Observable that emits a single item that is the result of accumulating the output from the
* items emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/reduce.html">ReactiveX operators documentation: Reduce</a>
* @see <a href="http://en.wikipedia.org/wiki/Fold_(higher-order_function)">Wikipedia: Fold (higher-order function)</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Single<R> reduce(R seed, BiFunction<R, ? super T, R> reducer) {
ObjectHelper.requireNonNull(seed, "seed is null");
ObjectHelper.requireNonNull(reducer, "reducer is null");
return RxJavaPlugins.onAssembly(new ObservableReduceSeedSingle<T, R>(this, seed, reducer));
}
/**
* Returns a Single that applies a specified accumulator function to the first item emitted by a source
* ObservableSource and a specified seed value, then feeds the result of that function along with the second item
* emitted by an ObservableSource into the same function, and so on until all items have been emitted by the
* source ObservableSource, emitting the final result from the final call to your function as its sole item.
* <p>
* <img width="640" height="325" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/reduceSeed.2.png" alt="">
* <p>
* This technique, which is called "reduce" here, is sometimes called "aggregate," "fold," "accumulate,"
* "compress," or "inject" in other programming contexts. Groovy, for instance, has an {@code inject} method
* that does a similar operation on lists.
* <p>
* Note that the {@code initialValue} is shared among all subscribers to the resulting ObservableSource
* and may cause problems if it is mutable. To make sure each subscriber gets its own value, defer
* the application of this operator via {@link #defer(Callable)}:
* <pre><code>
* ObservableSource<T> source = ...
* Observable.defer(() -> source.reduce(new ArrayList<>(), (list, item) -> list.add(item)));
*
* // alternatively, by using compose to stay fluent
*
* source.compose(o ->
* Observable.defer(() -> o.reduce(new ArrayList<>(), (list, item) -> list.add(item)))
* );
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code reduceWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the accumulator and output value type
* @param seedSupplier
* the Callable that provides the initial (seed) accumulator value for each individual Observer
* @param reducer
* an accumulator function to be invoked on each item emitted by the source ObservableSource, the
* result of which will be used in the next accumulator call
* @return a Single that emits a single item that is the result of accumulating the output from the
* items emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/reduce.html">ReactiveX operators documentation: Reduce</a>
* @see <a href="http://en.wikipedia.org/wiki/Fold_(higher-order_function)">Wikipedia: Fold (higher-order function)</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Single<R> reduceWith(Callable<R> seedSupplier, BiFunction<R, ? super T, R> reducer) {
ObjectHelper.requireNonNull(seedSupplier, "seedSupplier is null");
ObjectHelper.requireNonNull(reducer, "reducer is null");
return RxJavaPlugins.onAssembly(new ObservableReduceWithSingle<T, R>(this, seedSupplier, reducer));
}
/**
* Returns an Observable that repeats the sequence of items emitted by the source ObservableSource indefinitely.
* <p>
* <img width="640" height="309" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/repeat.o.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code repeat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that emits the items emitted by the source ObservableSource repeatedly and in sequence
* @see <a href="http://reactivex.io/documentation/operators/repeat.html">ReactiveX operators documentation: Repeat</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> repeat() {
return repeat(Long.MAX_VALUE);
}
/**
* Returns an Observable that repeats the sequence of items emitted by the source ObservableSource at most
* {@code count} times.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/repeat.on.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code repeat} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param times
* the number of times the source ObservableSource items are repeated, a count of 0 will yield an empty
* sequence
* @return an Observable that repeats the sequence of items emitted by the source ObservableSource at most
* {@code count} times
* @throws IllegalArgumentException
* if {@code count} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/repeat.html">ReactiveX operators documentation: Repeat</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> repeat(long times) {
if (times < 0) {
throw new IllegalArgumentException("times >= 0 required but it was " + times);
}
if (times == 0) {
return empty();
}
return RxJavaPlugins.onAssembly(new ObservableRepeat<T>(this, times));
}
/**
* Returns an Observable that repeats the sequence of items emitted by the source ObservableSource until
* the provided stop function returns true.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/repeat.on.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code repeatUntil} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param stop
* a boolean supplier that is called when the current Observable completes and unless it returns
* false, the current Observable is resubscribed
* @return the new Observable instance
* @throws NullPointerException
* if {@code stop} is null
* @see <a href="http://reactivex.io/documentation/operators/repeat.html">ReactiveX operators documentation: Repeat</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> repeatUntil(BooleanSupplier stop) {
ObjectHelper.requireNonNull(stop, "stop is null");
return RxJavaPlugins.onAssembly(new ObservableRepeatUntil<T>(this, stop));
}
/**
* Returns an Observable that emits the same values as the source ObservableSource with the exception of an
* {@code onComplete}. An {@code onComplete} notification from the source will result in the emission of
* a {@code void} item to the ObservableSource provided as an argument to the {@code notificationHandler}
* function. If that ObservableSource calls {@code onComplete} or {@code onError} then {@code repeatWhen} will
* call {@code onComplete} or {@code onError} on the child subscription. Otherwise, this ObservableSource will
* resubscribe to the source ObservableSource.
* <p>
* <img width="640" height="430" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/repeatWhen.f.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code repeatWhen} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param handler
* receives an ObservableSource of notifications with which a user can complete or error, aborting the repeat.
* @return the source ObservableSource modified with repeat logic
* @see <a href="http://reactivex.io/documentation/operators/repeat.html">ReactiveX operators documentation: Repeat</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> repeatWhen(final Function<? super Observable<Object>, ? extends ObservableSource<?>> handler) {
ObjectHelper.requireNonNull(handler, "handler is null");
return RxJavaPlugins.onAssembly(new ObservableRepeatWhen<T>(this, handler));
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the underlying ObservableSource
* that will replay all of its items and notifications to any future {@link Observer}. A Connectable
* ObservableSource resembles an ordinary ObservableSource, except that it does not begin emitting items when it is
* subscribed to, but only when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a {@link ConnectableObservable} that upon connection causes the source ObservableSource to emit its
* items to its {@link Observer}s
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final ConnectableObservable<T> replay() {
return ObservableReplay.createFrom(this);
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on the items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource.
* <p>
* <img width="640" height="450" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.f.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* the selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @return an Observable that emits items that are the results of invoking the selector on a
* {@link ConnectableObservable} that shares a single subscription to the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector) {
ObjectHelper.requireNonNull(selector, "selector is null");
return ObservableReplay.multicastSelector(ObservableInternalHelper.replayCallable(this), selector);
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying {@code bufferSize} notifications.
* <p>
* <img width="640" height="440" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.fn.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* the selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param bufferSize
* the buffer size that limits the number of items the connectable ObservableSource can replay
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource
* replaying no more than {@code bufferSize} items
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize) {
ObjectHelper.requireNonNull(selector, "selector is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return ObservableReplay.multicastSelector(ObservableInternalHelper.replayCallable(this, bufferSize), selector);
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying no more than {@code bufferSize} items that were emitted within a specified time window.
* <p>
* <img width="640" height="445" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.fnt.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param bufferSize
* the buffer size that limits the number of items the connectable ObservableSource can replay
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource, and
* replays no more than {@code bufferSize} items that were emitted within the window defined by
* {@code time}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, int bufferSize, long time, TimeUnit unit) {
return replay(selector, bufferSize, time, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying no more than {@code bufferSize} items that were emitted within a specified time window.
* <p>
* <img width="640" height="445" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.fnts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param bufferSize
* the buffer size that limits the number of items the connectable ObservableSource can replay
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @param scheduler
* the Scheduler that is the time source for the window
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource, and
* replays no more than {@code bufferSize} items that were emitted within the window defined by
* {@code time}
* @throws IllegalArgumentException
* if {@code bufferSize} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
ObjectHelper.requireNonNull(selector, "selector is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return ObservableReplay.multicastSelector(
ObservableInternalHelper.replayCallable(this, bufferSize, time, unit, scheduler), selector);
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying a maximum of {@code bufferSize} items.
* <p>
* <img width="640" height="440" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.fns.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param bufferSize
* the buffer size that limits the number of items the connectable ObservableSource can replay
* @param scheduler
* the Scheduler on which the replay is observed
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying no more than {@code bufferSize} notifications
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final <R> Observable<R> replay(final Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final int bufferSize, final Scheduler scheduler) {
ObjectHelper.requireNonNull(selector, "selector is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return ObservableReplay.multicastSelector(ObservableInternalHelper.replayCallable(this, bufferSize),
ObservableInternalHelper.replayFunction(selector, scheduler));
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying all items that were emitted within a specified time window.
* <p>
* <img width="640" height="435" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.ft.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying all items that were emitted within the window defined by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, long time, TimeUnit unit) {
return replay(selector, time, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying all items that were emitted within a specified time window.
* <p>
* <img width="640" height="440" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.fts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @param scheduler
* the scheduler that is the time source for the window
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying all items that were emitted within the window defined by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final <R> Observable<R> replay(Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final long time, final TimeUnit unit, final Scheduler scheduler) {
ObjectHelper.requireNonNull(selector, "selector is null");
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return ObservableReplay.multicastSelector(ObservableInternalHelper.replayCallable(this, time, unit, scheduler), selector);
}
/**
* Returns an Observable that emits items that are the results of invoking a specified selector on items
* emitted by a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource.
* <p>
* <img width="640" height="445" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.fs.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param selector
* a selector function, which can use the multicasted sequence as many times as needed, without
* causing multiple subscriptions to the ObservableSource
* @param scheduler
* the Scheduler where the replay is observed
* @return an Observable that emits items that are the results of invoking the selector on items emitted by
* a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource,
* replaying all items
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final <R> Observable<R> replay(final Function<? super Observable<T>, ? extends ObservableSource<R>> selector, final Scheduler scheduler) {
ObjectHelper.requireNonNull(selector, "selector is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return ObservableReplay.multicastSelector(ObservableInternalHelper.replayCallable(this),
ObservableInternalHelper.replayFunction(selector, scheduler));
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource that
* replays at most {@code bufferSize} items emitted by that ObservableSource. A Connectable ObservableSource resembles
* an ordinary ObservableSource, except that it does not begin emitting items when it is subscribed to, but only
* when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.n.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param bufferSize
* the buffer size that limits the number of items that can be replayed
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays at most {@code bufferSize} items emitted by that ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final ConnectableObservable<T> replay(final int bufferSize) {
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return ObservableReplay.create(this, bufferSize);
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays at most {@code bufferSize} items that were emitted during a specified time window. A Connectable
* ObservableSource resembles an ordinary ObservableSource, except that it does not begin emitting items when it is
* subscribed to, but only when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.nt.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param bufferSize
* the buffer size that limits the number of items that can be replayed
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays at most {@code bufferSize} items that were emitted during the window defined by
* {@code time}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final ConnectableObservable<T> replay(int bufferSize, long time, TimeUnit unit) {
return replay(bufferSize, time, unit, Schedulers.computation());
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* that replays a maximum of {@code bufferSize} items that are emitted within a specified time window. A
* Connectable ObservableSource resembles an ordinary ObservableSource, except that it does not begin emitting items
* when it is subscribed to, but only when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.nts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param bufferSize
* the buffer size that limits the number of items that can be replayed
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @param scheduler
* the scheduler that is used as a time source for the window
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays at most {@code bufferSize} items that were emitted during the window defined by
* {@code time}
* @throws IllegalArgumentException
* if {@code bufferSize} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final ConnectableObservable<T> replay(final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return ObservableReplay.create(this, time, unit, scheduler, bufferSize);
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays at most {@code bufferSize} items emitted by that ObservableSource. A Connectable ObservableSource resembles
* an ordinary ObservableSource, except that it does not begin emitting items when it is subscribed to, but only
* when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.ns.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param bufferSize
* the buffer size that limits the number of items that can be replayed
* @param scheduler
* the scheduler on which the Observers will observe the emitted items
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays at most {@code bufferSize} items that were emitted by the ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final ConnectableObservable<T> replay(final int bufferSize, final Scheduler scheduler) {
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return ObservableReplay.observeOn(replay(bufferSize), scheduler);
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays all items emitted by that ObservableSource within a specified time window. A Connectable ObservableSource
* resembles an ordinary ObservableSource, except that it does not begin emitting items when it is subscribed to,
* but only when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.t.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code replay} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays the items that were emitted during the window defined by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final ConnectableObservable<T> replay(long time, TimeUnit unit) {
return replay(time, unit, Schedulers.computation());
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays all items emitted by that ObservableSource within a specified time window. A Connectable ObservableSource
* resembles an ordinary ObservableSource, except that it does not begin emitting items when it is subscribed to,
* but only when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.ts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param time
* the duration of the window in which the replayed items must have been emitted
* @param unit
* the time unit of {@code time}
* @param scheduler
* the Scheduler that is the time source for the window
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource and
* replays the items that were emitted during the window defined by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final ConnectableObservable<T> replay(final long time, final TimeUnit unit, final Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return ObservableReplay.create(this, time, unit, scheduler);
}
/**
* Returns a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource that
* will replay all of its items and notifications to any future {@link Observer} on the given
* {@link Scheduler}. A Connectable ObservableSource resembles an ordinary ObservableSource, except that it does not
* begin emitting items when it is subscribed to, but only when its {@code connect} method is called.
* <p>
* <img width="640" height="515" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/replay.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param scheduler
* the Scheduler on which the Observers will observe the emitted items
* @return a {@link ConnectableObservable} that shares a single subscription to the source ObservableSource that
* will replay all of its items and notifications to any future {@link Observer} on the given
* {@link Scheduler}
* @see <a href="http://reactivex.io/documentation/operators/replay.html">ReactiveX operators documentation: Replay</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final ConnectableObservable<T> replay(final Scheduler scheduler) {
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return ObservableReplay.observeOn(replay(), scheduler);
}
/**
* Returns an Observable that mirrors the source ObservableSource, resubscribing to it if it calls {@code onError}
* (infinite retry count).
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt="">
* <p>
* If the source ObservableSource calls {@link Observer#onError}, this method will resubscribe to the source
* ObservableSource rather than propagating the {@code onError} call.
* <p>
* Any and all items emitted by the source ObservableSource will be emitted by the resulting ObservableSource, even
* those emitted during failed subscriptions. For example, if an ObservableSource fails at first but emits
* {@code [1, 2]} then succeeds the second time and emits {@code [1, 2, 3, 4, 5]} then the complete sequence
* of emissions and notifications would be {@code [1, 2, 1, 2, 3, 4, 5, onComplete]}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retry} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the source ObservableSource modified with retry logic
* @see <a href="http://reactivex.io/documentation/operators/retry.html">ReactiveX operators documentation: Retry</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retry() {
return retry(Long.MAX_VALUE, Functions.alwaysTrue());
}
/**
* Returns an Observable that mirrors the source ObservableSource, resubscribing to it if it calls {@code onError}
* and the predicate returns true for that specific exception and retry count.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retry} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate
* the predicate that determines if a resubscription may happen in case of a specific exception
* and retry count
* @return the source ObservableSource modified with retry logic
* @see #retry()
* @see <a href="http://reactivex.io/documentation/operators/retry.html">ReactiveX operators documentation: Retry</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retry(BiPredicate<? super Integer, ? super Throwable> predicate) {
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableRetryBiPredicate<T>(this, predicate));
}
/**
* Returns an Observable that mirrors the source ObservableSource, resubscribing to it if it calls {@code onError}
* up to a specified number of retries.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt="">
* <p>
* If the source ObservableSource calls {@link Observer#onError}, this method will resubscribe to the source
* ObservableSource for a maximum of {@code count} resubscriptions rather than propagating the
* {@code onError} call.
* <p>
* Any and all items emitted by the source ObservableSource will be emitted by the resulting ObservableSource, even
* those emitted during failed subscriptions. For example, if an ObservableSource fails at first but emits
* {@code [1, 2]} then succeeds the second time and emits {@code [1, 2, 3, 4, 5]} then the complete sequence
* of emissions and notifications would be {@code [1, 2, 1, 2, 3, 4, 5, onComplete]}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retry} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param times
* number of retry attempts before failing
* @return the source ObservableSource modified with retry logic
* @see <a href="http://reactivex.io/documentation/operators/retry.html">ReactiveX operators documentation: Retry</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retry(long times) {
return retry(times, Functions.alwaysTrue());
}
/**
* Retries at most times or until the predicate returns false, whichever happens first.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retry} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param times the number of times to repeat
* @param predicate the predicate called with the failure Throwable and should return true to trigger a retry.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retry(long times, Predicate<? super Throwable> predicate) {
if (times < 0) {
throw new IllegalArgumentException("times >= 0 required but it was " + times);
}
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableRetryPredicate<T>(this, times, predicate));
}
/**
* Retries the current Observable if the predicate returns true.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retry} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate the predicate that receives the failure Throwable and should return true to trigger a retry.
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retry(Predicate<? super Throwable> predicate) {
return retry(Long.MAX_VALUE, predicate);
}
/**
* Retries until the given stop function returns true.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retry.png" alt=""> * <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retryUntil} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param stop the function that should return true to stop retrying
* @return the new Observable instance
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retryUntil(final BooleanSupplier stop) {
ObjectHelper.requireNonNull(stop, "stop is null");
return retry(Long.MAX_VALUE, Functions.predicateReverseFor(stop));
}
/**
* Returns an Observable that emits the same values as the source ObservableSource with the exception of an
* {@code onError}. An {@code onError} notification from the source will result in the emission of a
* {@link Throwable} item to the ObservableSource provided as an argument to the {@code notificationHandler}
* function. If that ObservableSource calls {@code onComplete} or {@code onError} then {@code retry} will call
* {@code onComplete} or {@code onError} on the child subscription. Otherwise, this ObservableSource will
* resubscribe to the source ObservableSource.
* <p>
* <img width="640" height="430" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/retryWhen.f.png" alt="">
*
* Example:
*
* This retries 3 times, each time incrementing the number of seconds it waits.
*
* <pre><code>
* ObservableSource.create((Observer<? super String> s) -> {
* System.out.println("subscribing");
* s.onError(new RuntimeException("always fails"));
* }).retryWhen(attempts -> {
* return attempts.zipWith(ObservableSource.range(1, 3), (n, i) -> i).flatMap(i -> {
* System.out.println("delay retry by " + i + " second(s)");
* return ObservableSource.timer(i, TimeUnit.SECONDS);
* });
* }).blockingForEach(System.out::println);
* </code></pre>
*
* Output is:
*
* <pre> {@code
* subscribing
* delay retry by 1 second(s)
* subscribing
* delay retry by 2 second(s)
* subscribing
* delay retry by 3 second(s)
* subscribing
* } </pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code retryWhen} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param handler
* receives an ObservableSource of notifications with which a user can complete or error, aborting the
* retry
* @return the source ObservableSource modified with retry logic
* @see <a href="http://reactivex.io/documentation/operators/retry.html">ReactiveX operators documentation: Retry</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> retryWhen(
final Function<? super Observable<Throwable>, ? extends ObservableSource<?>> handler) {
ObjectHelper.requireNonNull(handler, "handler is null");
return RxJavaPlugins.onAssembly(new ObservableRetryWhen<T>(this, handler));
}
/**
* Subscribes to the current Observable and wraps the given Observer into a SafeObserver
* (if not already a SafeObserver) that
* deals with exceptions thrown by a misbehaving Observer (that doesn't follow the
* Reactive-Streams specification).
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code safeSubscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param s the incoming Observer instance
* @throws NullPointerException if s is null
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final void safeSubscribe(Observer<? super T> s) {
ObjectHelper.requireNonNull(s, "s is null");
if (s instanceof SafeObserver) {
subscribe(s);
} else {
subscribe(new SafeObserver<T>(s));
}
}
/**
* Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource
* within periodic time intervals.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sample.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sample} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param period
* the sampling rate
* @param unit
* the {@link TimeUnit} in which {@code period} is defined
* @return an Observable that emits the results of sampling the items emitted by the source ObservableSource at
* the specified time interval
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @see #throttleLast(long, TimeUnit)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> sample(long period, TimeUnit unit) {
return sample(period, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource
* within periodic time intervals and optionally emit the very last upstream item when the upstream completes.
* <p>
* <img width="640" height="276" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sample.emitlast.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sample} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* <p>History: 2.0.5 - experimental
* @param period
* the sampling rate
* @param unit
* the {@link TimeUnit} in which {@code period} is defined
* @return an Observable that emits the results of sampling the items emitted by the source ObservableSource at
* the specified time interval
* @param emitLast
* if true and the upstream completes while there is still an unsampled item available,
* that item is emitted to downstream before completion
* if false, an unsampled last item is ignored.
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @see #throttleLast(long, TimeUnit)
* @since 2.1
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> sample(long period, TimeUnit unit, boolean emitLast) {
return sample(period, unit, Schedulers.computation(), emitLast);
}
/**
* Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource
* within periodic time intervals, where the intervals are defined on a particular Scheduler.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sample.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param period
* the sampling rate
* @param unit
* the {@link TimeUnit} in which {@code period} is defined
* @param scheduler
* the {@link Scheduler} to use when sampling
* @return an Observable that emits the results of sampling the items emitted by the source ObservableSource at
* the specified time interval
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @see #throttleLast(long, TimeUnit, Scheduler)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> sample(long period, TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableSampleTimed<T>(this, period, unit, scheduler, false));
}
/**
* Returns an Observable that emits the most recently emitted item (if any) emitted by the source ObservableSource
* within periodic time intervals, where the intervals are defined on a particular Scheduler
* and optionally emit the very last upstream item when the upstream completes.
* <p>
* <img width="640" height="276" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sample.s.emitlast.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* <p>History: 2.0.5 - experimental
* @param period
* the sampling rate
* @param unit
* the {@link TimeUnit} in which {@code period} is defined
* @param scheduler
* the {@link Scheduler} to use when sampling
* @param emitLast
* if true and the upstream completes while there is still an unsampled item available,
* that item is emitted to downstream before completion
* if false, an unsampled last item is ignored.
* @return an Observable that emits the results of sampling the items emitted by the source ObservableSource at
* the specified time interval
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @see #throttleLast(long, TimeUnit, Scheduler)
* @since 2.1
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> sample(long period, TimeUnit unit, Scheduler scheduler, boolean emitLast) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableSampleTimed<T>(this, period, unit, scheduler, emitLast));
}
/**
* Returns an Observable that, when the specified {@code sampler} ObservableSource emits an item or completes,
* emits the most recently emitted item (if any) emitted by the source ObservableSource since the previous
* emission from the {@code sampler} ObservableSource.
* <p>
* <img width="640" height="289" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sample.o.nolast.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code sample} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the element type of the sampler ObservableSource
* @param sampler
* the ObservableSource to use for sampling the source ObservableSource
* @return an Observable that emits the results of sampling the items emitted by this ObservableSource whenever
* the {@code sampler} ObservableSource emits an item or completes
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> sample(ObservableSource<U> sampler) {
ObjectHelper.requireNonNull(sampler, "sampler is null");
return RxJavaPlugins.onAssembly(new ObservableSampleWithObservable<T>(this, sampler, false));
}
/**
* Returns an Observable that, when the specified {@code sampler} ObservableSource emits an item or completes,
* emits the most recently emitted item (if any) emitted by the source ObservableSource since the previous
* emission from the {@code sampler} ObservableSource
* and optionally emit the very last upstream item when the upstream or other ObservableSource complete.
* <p>
* <img width="640" height="289" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/sample.o.emitlast.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code sample} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* <p>History: 2.0.5 - experimental
* @param <U> the element type of the sampler ObservableSource
* @param sampler
* the ObservableSource to use for sampling the source ObservableSource
* @param emitLast
* if true and the upstream completes while there is still an unsampled item available,
* that item is emitted to downstream before completion
* if false, an unsampled last item is ignored.
* @return an Observable that emits the results of sampling the items emitted by this ObservableSource whenever
* the {@code sampler} ObservableSource emits an item or completes
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @since 2.1
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> sample(ObservableSource<U> sampler, boolean emitLast) {
ObjectHelper.requireNonNull(sampler, "sampler is null");
return RxJavaPlugins.onAssembly(new ObservableSampleWithObservable<T>(this, sampler, emitLast));
}
/**
* Returns an Observable that applies a specified accumulator function to the first item emitted by a source
* ObservableSource, then feeds the result of that function along with the second item emitted by the source
* ObservableSource into the same function, and so on until all items have been emitted by the source ObservableSource,
* emitting the result of each of these iterations.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/scan.png" alt="">
* <p>
* This sort of function is sometimes called an accumulator.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code scan} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param accumulator
* an accumulator function to be invoked on each item emitted by the source ObservableSource, whose
* result will be emitted to {@link Observer}s via {@link Observer#onNext onNext} and used in the
* next accumulator call
* @return an Observable that emits the results of each call to the accumulator function
* @see <a href="http://reactivex.io/documentation/operators/scan.html">ReactiveX operators documentation: Scan</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> scan(BiFunction<T, T, T> accumulator) {
ObjectHelper.requireNonNull(accumulator, "accumulator is null");
return RxJavaPlugins.onAssembly(new ObservableScan<T>(this, accumulator));
}
/**
* Returns an Observable that applies a specified accumulator function to the first item emitted by a source
* ObservableSource and a seed value, then feeds the result of that function along with the second item emitted by
* the source ObservableSource into the same function, and so on until all items have been emitted by the source
* ObservableSource, emitting the result of each of these iterations.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/scanSeed.png" alt="">
* <p>
* This sort of function is sometimes called an accumulator.
* <p>
* Note that the ObservableSource that results from this method will emit {@code initialValue} as its first
* emitted item.
* <p>
* Note that the {@code initialValue} is shared among all subscribers to the resulting ObservableSource
* and may cause problems if it is mutable. To make sure each subscriber gets its own value, defer
* the application of this operator via {@link #defer(Callable)}:
* <pre><code>
* ObservableSource<T> source = ...
* Observable.defer(() -> source.scan(new ArrayList<>(), (list, item) -> list.add(item)));
*
* // alternatively, by using compose to stay fluent
*
* source.compose(o ->
* Observable.defer(() -> o.scan(new ArrayList<>(), (list, item) -> list.add(item)))
* );
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code scan} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the initial, accumulator and result type
* @param initialValue
* the initial (seed) accumulator item
* @param accumulator
* an accumulator function to be invoked on each item emitted by the source ObservableSource, whose
* result will be emitted to {@link Observer}s via {@link Observer#onNext onNext} and used in the
* next accumulator call
* @return an Observable that emits {@code initialValue} followed by the results of each call to the
* accumulator function
* @see <a href="http://reactivex.io/documentation/operators/scan.html">ReactiveX operators documentation: Scan</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> scan(final R initialValue, BiFunction<R, ? super T, R> accumulator) {
ObjectHelper.requireNonNull(initialValue, "seed is null");
return scanWith(Functions.justCallable(initialValue), accumulator);
}
/**
* Returns an Observable that applies a specified accumulator function to the first item emitted by a source
* ObservableSource and a seed value, then feeds the result of that function along with the second item emitted by
* the source ObservableSource into the same function, and so on until all items have been emitted by the source
* ObservableSource, emitting the result of each of these iterations.
* <p>
* <img width="640" height="320" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/scanSeed.png" alt="">
* <p>
* This sort of function is sometimes called an accumulator.
* <p>
* Note that the ObservableSource that results from this method will emit {@code initialValue} as its first
* emitted item.
* <p>
* Note that the {@code initialValue} is shared among all subscribers to the resulting ObservableSource
* and may cause problems if it is mutable. To make sure each subscriber gets its own value, defer
* the application of this operator via {@link #defer(Callable)}:
* <pre><code>
* ObservableSource<T> source = ...
* Observable.defer(() -> source.scan(new ArrayList<>(), (list, item) -> list.add(item)));
*
* // alternatively, by using compose to stay fluent
*
* source.compose(o ->
* Observable.defer(() -> o.scan(new ArrayList<>(), (list, item) -> list.add(item)))
* );
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code scanWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the initial, accumulator and result type
* @param seedSupplier
* a Callable that returns the initial (seed) accumulator item for each individual Observer
* @param accumulator
* an accumulator function to be invoked on each item emitted by the source ObservableSource, whose
* result will be emitted to {@link Observer}s via {@link Observer#onNext onNext} and used in the
* next accumulator call
* @return an Observable that emits {@code initialValue} followed by the results of each call to the
* accumulator function
* @see <a href="http://reactivex.io/documentation/operators/scan.html">ReactiveX operators documentation: Scan</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> scanWith(Callable<R> seedSupplier, BiFunction<R, ? super T, R> accumulator) {
ObjectHelper.requireNonNull(seedSupplier, "seedSupplier is null");
ObjectHelper.requireNonNull(accumulator, "accumulator is null");
return RxJavaPlugins.onAssembly(new ObservableScanSeed<T, R>(this, seedSupplier, accumulator));
}
/**
* Forces an ObservableSource's emissions and notifications to be serialized and for it to obey
* <a href="http://reactivex.io/documentation/contract.html">the ObservableSource contract</a> in other ways.
* <p>
* It is possible for an ObservableSource to invoke its Observers' methods asynchronously, perhaps from
* different threads. This could make such an ObservableSource poorly-behaved, in that it might try to invoke
* {@code onComplete} or {@code onError} before one of its {@code onNext} invocations, or it might call
* {@code onNext} from two different threads concurrently. You can force such an ObservableSource to be
* well-behaved and sequential by applying the {@code serialize} method to it.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/synchronize.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code serialize} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an {@link ObservableSource} that is guaranteed to be well-behaved and to make only serialized calls to
* its observers
* @see <a href="http://reactivex.io/documentation/operators/serialize.html">ReactiveX operators documentation: Serialize</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> serialize() {
return RxJavaPlugins.onAssembly(new ObservableSerialized<T>(this));
}
/**
* Returns a new {@link ObservableSource} that multicasts (shares) the original {@link ObservableSource}. As long as
* there is at least one {@link Observer} this {@link ObservableSource} will be subscribed and emitting data.
* When all subscribers have disposed it will dispose the source {@link ObservableSource}.
* <p>
* This is an alias for {@link #publish()}.{@link ConnectableObservable#refCount()}.
* <p>
* <img width="640" height="510" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/publishRefCount.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code share} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return an {@code ObservableSource} that upon connection causes the source {@code ObservableSource} to emit items
* to its {@link Observer}s
* @see <a href="http://reactivex.io/documentation/operators/refcount.html">ReactiveX operators documentation: RefCount</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> share() {
return publish().refCount();
}
/**
* Returns a Maybe that emits the single item emitted by this Observable if this Observable
* emits only a single item, otherwise if this Observable emits more than one item or no items, an
* {@code IllegalArgumentException} or {@code NoSuchElementException} is signalled respectively.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/singleElement.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code singleElement} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a {@link Maybe} that emits the single item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX operators documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Maybe<T> singleElement() {
return RxJavaPlugins.onAssembly(new ObservableSingleMaybe<T>(this));
}
/**
* Returns a Single that emits the single item emitted by this Observable, if this Observable
* emits only a single item, or a default item if the source ObservableSource emits no items. If the source
* ObservableSource emits more than one item, an {@code IllegalArgumentException} is signalled instead.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/single.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code single} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param defaultItem
* a default value to emit if the source ObservableSource emits no item
* @return the new Single instance
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX operators documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> single(T defaultItem) {
ObjectHelper.requireNonNull(defaultItem, "defaultItem is null");
return RxJavaPlugins.onAssembly(new ObservableSingleSingle<T>(this, defaultItem));
}
/**
* Returns a Single that emits the single item emitted by this Observable if this Observable
* emits only a single item, otherwise
* if this Observable completes without emitting any items or emits more than one item a
* {@link NoSuchElementException} or {@code IllegalArgumentException} will be signalled respectively.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/single.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code singleOrError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return the new Single instance
* @see <a href="http://reactivex.io/documentation/operators/first.html">ReactiveX operators documentation: First</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<T> singleOrError() {
return RxJavaPlugins.onAssembly(new ObservableSingleSingle<T>(this, null));
}
/**
* Returns an Observable that skips the first {@code count} items emitted by the source ObservableSource and emits
* the remainder.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skip.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code skip} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the number of items to skip
* @return an Observable that is identical to the source ObservableSource except that it does not emit the first
* {@code count} items that the source ObservableSource emits
* @see <a href="http://reactivex.io/documentation/operators/skip.html">ReactiveX operators documentation: Skip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> skip(long count) {
if (count <= 0) {
return RxJavaPlugins.onAssembly(this);
}
return RxJavaPlugins.onAssembly(new ObservableSkip<T>(this, count));
}
/**
* Returns an Observable that skips values emitted by the source ObservableSource before a specified time window
* elapses.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skip.t.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code skip} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the length of the time window to skip
* @param unit
* the time unit of {@code time}
* @return an Observable that skips values emitted by the source ObservableSource before the time window defined
* by {@code time} elapses and the emits the remainder
* @see <a href="http://reactivex.io/documentation/operators/skip.html">ReactiveX operators documentation: Skip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> skip(long time, TimeUnit unit) {
return skipUntil(timer(time, unit));
}
/**
* Returns an Observable that skips values emitted by the source ObservableSource before a specified time window
* on a specified {@link Scheduler} elapses.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skip.ts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use for the timed skipping</dd>
* </dl>
*
* @param time
* the length of the time window to skip
* @param unit
* the time unit of {@code time}
* @param scheduler
* the {@link Scheduler} on which the timed wait happens
* @return an Observable that skips values emitted by the source ObservableSource before the time window defined
* by {@code time} and {@code scheduler} elapses, and then emits the remainder
* @see <a href="http://reactivex.io/documentation/operators/skip.html">ReactiveX operators documentation: Skip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> skip(long time, TimeUnit unit, Scheduler scheduler) {
return skipUntil(timer(time, unit, scheduler));
}
/**
* Returns an Observable that drops a specified number of items from the end of the sequence emitted by the
* source ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipLast.png" alt="">
* <p>
* This Observer accumulates a queue long enough to store the first {@code count} items. As more items are
* received, items are taken from the front of the queue and emitted by the returned ObservableSource. This causes
* such items to be delayed.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code skipLast} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* number of items to drop from the end of the source sequence
* @return an Observable that emits the items emitted by the source ObservableSource except for the dropped ones
* at the end
* @throws IndexOutOfBoundsException
* if {@code count} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/skiplast.html">ReactiveX operators documentation: SkipLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> skipLast(int count) {
if (count < 0) {
throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
}
if (count == 0) {
return RxJavaPlugins.onAssembly(this);
}
return RxJavaPlugins.onAssembly(new ObservableSkipLast<T>(this, count));
}
/**
* Returns an Observable that drops items emitted by the source ObservableSource during a specified time window
* before the source completes.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipLast.t.png" alt="">
* <p>
* Note: this action will cache the latest items arriving in the specified time window.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code skipLast} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @return an Observable that drops those items emitted by the source ObservableSource in a time window before the
* source completes defined by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/skiplast.html">ReactiveX operators documentation: SkipLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.TRAMPOLINE)
public final Observable<T> skipLast(long time, TimeUnit unit) {
return skipLast(time, unit, Schedulers.trampoline(), false, bufferSize());
}
/**
* Returns an Observable that drops items emitted by the source ObservableSource during a specified time window
* before the source completes.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipLast.t.png" alt="">
* <p>
* Note: this action will cache the latest items arriving in the specified time window.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code skipLast} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @return an Observable that drops those items emitted by the source ObservableSource in a time window before the
* source completes defined by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/skiplast.html">ReactiveX operators documentation: SkipLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.TRAMPOLINE)
public final Observable<T> skipLast(long time, TimeUnit unit, boolean delayError) {
return skipLast(time, unit, Schedulers.trampoline(), delayError, bufferSize());
}
/**
* Returns an Observable that drops items emitted by the source ObservableSource during a specified time window
* (defined on a specified scheduler) before the source completes.
* <p>
* <img width="640" height="340" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipLast.ts.png" alt="">
* <p>
* Note: this action will cache the latest items arriving in the specified time window.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use for tracking the current time</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the scheduler used as the time source
* @return an Observable that drops those items emitted by the source ObservableSource in a time window before the
* source completes defined by {@code time} and {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/skiplast.html">ReactiveX operators documentation: SkipLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler) {
return skipLast(time, unit, scheduler, false, bufferSize());
}
/**
* Returns an Observable that drops items emitted by the source ObservableSource during a specified time window
* (defined on a specified scheduler) before the source completes.
* <p>
* <img width="640" height="340" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipLast.ts.png" alt="">
* <p>
* Note: this action will cache the latest items arriving in the specified time window.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use to track the current time</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the scheduler used as the time source
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @return an Observable that drops those items emitted by the source ObservableSource in a time window before the
* source completes defined by {@code time} and {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/skiplast.html">ReactiveX operators documentation: SkipLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError) {
return skipLast(time, unit, scheduler, delayError, bufferSize());
}
/**
* Returns an Observable that drops items emitted by the source ObservableSource during a specified time window
* (defined on a specified scheduler) before the source completes.
* <p>
* <img width="640" height="340" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipLast.ts.png" alt="">
* <p>
* Note: this action will cache the latest items arriving in the specified time window.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the scheduler used as the time source
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @param bufferSize
* the hint about how many elements to expect to be skipped
* @return an Observable that drops those items emitted by the source ObservableSource in a time window before the
* source completes defined by {@code time} and {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/skiplast.html">ReactiveX operators documentation: SkipLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> skipLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
// the internal buffer holds pairs of (timestamp, value) so double the default buffer size
int s = bufferSize << 1;
return RxJavaPlugins.onAssembly(new ObservableSkipLastTimed<T>(this, time, unit, scheduler, s, delayError));
}
/**
* Returns an Observable that skips items emitted by the source ObservableSource until a second ObservableSource emits
* an item.
* <p>
* <img width="640" height="375" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipUntil.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code skipUntil} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the element type of the other ObservableSource
* @param other
* the second ObservableSource that has to emit an item before the source ObservableSource's elements begin
* to be mirrored by the resulting ObservableSource
* @return an Observable that skips items from the source ObservableSource until the second ObservableSource emits an
* item, then emits the remaining items
* @see <a href="http://reactivex.io/documentation/operators/skipuntil.html">ReactiveX operators documentation: SkipUntil</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> skipUntil(ObservableSource<U> other) {
ObjectHelper.requireNonNull(other, "other is null");
return RxJavaPlugins.onAssembly(new ObservableSkipUntil<T, U>(this, other));
}
/**
* Returns an Observable that skips all items emitted by the source ObservableSource as long as a specified
* condition holds true, but emits all further source items as soon as the condition becomes false.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/skipWhile.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code skipWhile} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate
* a function to test each item emitted from the source ObservableSource
* @return an Observable that begins emitting items emitted by the source ObservableSource when the specified
* predicate becomes false
* @see <a href="http://reactivex.io/documentation/operators/skipwhile.html">ReactiveX operators documentation: SkipWhile</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> skipWhile(Predicate<? super T> predicate) {
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableSkipWhile<T>(this, predicate));
}
/**
* Returns an Observable that emits the events emitted by source ObservableSource, in a
* sorted order. Each item emitted by the ObservableSource must implement {@link Comparable} with respect to all
* other items in the sequence.
*
* <p>If any item emitted by this Observable does not implement {@link Comparable} with respect to
* all other items emitted by this Observable, no items will be emitted and the
* sequence is terminated with a {@link ClassCastException}.
*
* <p>Note that calling {@code sorted} with long, non-terminating or infinite sources
* might cause {@link OutOfMemoryError}
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sorted} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return an Observable that emits the items emitted by the source ObservableSource in sorted order
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> sorted() {
return toList().toObservable().map(Functions.listSorter(Functions.<T>naturalComparator())).flatMapIterable(Functions.<List<T>>identity());
}
/**
* Returns an Observable that emits the events emitted by source ObservableSource, in a
* sorted order based on a specified comparison function.
*
* <p>Note that calling {@code sorted} with long, non-terminating or infinite sources
* might cause {@link OutOfMemoryError}
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code sorted} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param sortFunction
* a function that compares two items emitted by the source ObservableSource and returns an Integer
* that indicates their sort order
* @return an Observable that emits the items emitted by the source ObservableSource in sorted order
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> sorted(Comparator<? super T> sortFunction) {
ObjectHelper.requireNonNull(sortFunction, "sortFunction is null");
return toList().toObservable().map(Functions.listSorter(sortFunction)).flatMapIterable(Functions.<List<T>>identity());
}
/**
* Returns an Observable that emits the items in a specified {@link Iterable} before it begins to emit items
* emitted by the source ObservableSource.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/startWith.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code startWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param items
* an Iterable that contains the items you want the modified ObservableSource to emit first
* @return an Observable that emits the items in the specified {@link Iterable} and then emits the items
* emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/startwith.html">ReactiveX operators documentation: StartWith</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> startWith(Iterable<? extends T> items) {
return concatArray(fromIterable(items), this);
}
/**
* Returns an Observable that emits the items in a specified {@link ObservableSource} before it begins to emit
* items emitted by the source ObservableSource.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/startWith.o.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code startWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param other
* an ObservableSource that contains the items you want the modified ObservableSource to emit first
* @return an Observable that emits the items in the specified {@link ObservableSource} and then emits the items
* emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/startwith.html">ReactiveX operators documentation: StartWith</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> startWith(ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return concatArray(other, this);
}
/**
* Returns an Observable that emits a specified item before it begins to emit items emitted by the source
* ObservableSource.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/startWith.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code startWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param item
* the item to emit first
* @return an Observable that emits the specified item before it begins to emit items emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/startwith.html">ReactiveX operators documentation: StartWith</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> startWith(T item) {
ObjectHelper.requireNonNull(item, "item is null");
return concatArray(just(item), this);
}
/**
* Returns an Observable that emits the specified items before it begins to emit items emitted by the source
* ObservableSource.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/startWith.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code startWithArray} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param items
* the array of values to emit first
* @return an Observable that emits the specified items before it begins to emit items emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/startwith.html">ReactiveX operators documentation: StartWith</a>
*/
@SuppressWarnings("unchecked")
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> startWithArray(T... items) {
Observable<T> fromArray = fromArray(items);
if (fromArray == empty()) {
return RxJavaPlugins.onAssembly(this);
}
return concatArray(fromArray, this);
}
/**
* Subscribes to an ObservableSource and ignores {@code onNext} and {@code onComplete} emissions.
* <p>
* If the Observable emits an error, it is wrapped into an
* {@link io.reactivex.exceptions.OnErrorNotImplementedException OnErrorNotImplementedException}
* and routed to the RxJavaPlugins.onError handler.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code subscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a {@link Disposable} reference with which the caller can stop receiving items before
* the ObservableSource has finished sending them
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable subscribe() {
return subscribe(Functions.emptyConsumer(), Functions.ON_ERROR_MISSING, Functions.EMPTY_ACTION, Functions.emptyConsumer());
}
/**
* Subscribes to an ObservableSource and provides a callback to handle the items it emits.
* <p>
* If the Observable emits an error, it is wrapped into an
* {@link io.reactivex.exceptions.OnErrorNotImplementedException OnErrorNotImplementedException}
* and routed to the RxJavaPlugins.onError handler.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code subscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* the {@code Consumer<T>} you have designed to accept emissions from the ObservableSource
* @return a {@link Disposable} reference with which the caller can stop receiving items before
* the ObservableSource has finished sending them
* @throws NullPointerException
* if {@code onNext} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable subscribe(Consumer<? super T> onNext) {
return subscribe(onNext, Functions.ON_ERROR_MISSING, Functions.EMPTY_ACTION, Functions.emptyConsumer());
}
/**
* Subscribes to an ObservableSource and provides callbacks to handle the items it emits and any error
* notification it issues.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code subscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* the {@code Consumer<T>} you have designed to accept emissions from the ObservableSource
* @param onError
* the {@code Consumer<Throwable>} you have designed to accept any error notification from the
* ObservableSource
* @return a {@link Disposable} reference with which the caller can stop receiving items before
* the ObservableSource has finished sending them
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
* @throws NullPointerException
* if {@code onNext} is null, or
* if {@code onError} is null
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError) {
return subscribe(onNext, onError, Functions.EMPTY_ACTION, Functions.emptyConsumer());
}
/**
* Subscribes to an ObservableSource and provides callbacks to handle the items it emits and any error or
* completion notification it issues.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code subscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* the {@code Consumer<T>} you have designed to accept emissions from the ObservableSource
* @param onError
* the {@code Consumer<Throwable>} you have designed to accept any error notification from the
* ObservableSource
* @param onComplete
* the {@code Action} you have designed to accept a completion notification from the
* ObservableSource
* @return a {@link Disposable} reference with which the caller can stop receiving items before
* the ObservableSource has finished sending them
* @throws NullPointerException
* if {@code onNext} is null, or
* if {@code onError} is null, or
* if {@code onComplete} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError,
Action onComplete) {
return subscribe(onNext, onError, onComplete, Functions.emptyConsumer());
}
/**
* Subscribes to an ObservableSource and provides callbacks to handle the items it emits and any error or
* completion notification it issues.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code subscribe} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param onNext
* the {@code Consumer<T>} you have designed to accept emissions from the ObservableSource
* @param onError
* the {@code Consumer<Throwable>} you have designed to accept any error notification from the
* ObservableSource
* @param onComplete
* the {@code Action} you have designed to accept a completion notification from the
* ObservableSource
* @param onSubscribe
* the {@code Consumer} that receives the upstream's Disposable
* @return a {@link Disposable} reference with which the caller can stop receiving items before
* the ObservableSource has finished sending them
* @throws NullPointerException
* if {@code onNext} is null, or
* if {@code onError} is null, or
* if {@code onComplete} is null
* @see <a href="http://reactivex.io/documentation/operators/subscribe.html">ReactiveX operators documentation: Subscribe</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Disposable subscribe(Consumer<? super T> onNext, Consumer<? super Throwable> onError,
Action onComplete, Consumer<? super Disposable> onSubscribe) {
ObjectHelper.requireNonNull(onNext, "onNext is null");
ObjectHelper.requireNonNull(onError, "onError is null");
ObjectHelper.requireNonNull(onComplete, "onComplete is null");
ObjectHelper.requireNonNull(onSubscribe, "onSubscribe is null");
LambdaObserver<T> ls = new LambdaObserver<T>(onNext, onError, onComplete, onSubscribe);
subscribe(ls);
return ls;
}
@SchedulerSupport(SchedulerSupport.NONE)
@Override
public final void subscribe(Observer<? super T> observer) {
ObjectHelper.requireNonNull(observer, "observer is null");
try {
observer = RxJavaPlugins.onSubscribe(this, observer);
ObjectHelper.requireNonNull(observer, "Plugin returned null Observer");
subscribeActual(observer);
} catch (NullPointerException e) { // NOPMD
throw e;
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
// can't call onError because no way to know if a Disposable has been set or not
// can't call onSubscribe because the call might have set a Subscription already
RxJavaPlugins.onError(e);
NullPointerException npe = new NullPointerException("Actually not, but can't throw other exceptions due to RS");
npe.initCause(e);
throw npe;
}
}
/**
* Operator implementations (both source and intermediate) should implement this method that
* performs the necessary business logic.
* <p>There is no need to call any of the plugin hooks on the current Observable instance or
* the Subscriber.
* @param observer the incoming Observer, never null
*/
protected abstract void subscribeActual(Observer<? super T> observer);
/**
* Subscribes a given Observer (subclass) to this Observable and returns the given
* Observer as is.
* <p>Usage example:
* <pre><code>
* Observable<Integer> source = Observable.range(1, 10);
* CompositeDisposable composite = new CompositeDisposable();
*
* ResourceObserver<Integer> rs = new ResourceObserver<>() {
* // ...
* };
*
* composite.add(source.subscribeWith(rs));
* </code></pre>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code subscribeWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <E> the type of the Observer to use and return
* @param observer the Observer (subclass) to use and return, not null
* @return the input {@code observer}
* @throws NullPointerException if {@code observer} is null
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <E extends Observer<? super T>> E subscribeWith(E observer) {
subscribe(observer);
return observer;
}
/**
* Asynchronously subscribes Observers to this ObservableSource on the specified {@link Scheduler}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/subscribeOn.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param scheduler
* the {@link Scheduler} to perform subscription actions on
* @return the source ObservableSource modified so that its subscriptions happen on the
* specified {@link Scheduler}
* @see <a href="http://reactivex.io/documentation/operators/subscribeon.html">ReactiveX operators documentation: SubscribeOn</a>
* @see <a href="http://www.grahamlea.com/2014/07/rxjava-threading-examples/">RxJava Threading Examples</a>
* @see #observeOn
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> subscribeOn(Scheduler scheduler) {
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableSubscribeOn<T>(this, scheduler));
}
/**
* Returns an Observable that emits the items emitted by the source ObservableSource or the items of an alternate
* ObservableSource if the source ObservableSource is empty.
* <img width="640" height="255" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchifempty.png" alt="">
* <p/>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchIfEmpty} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param other
* the alternate ObservableSource to subscribe to if the source does not emit any items
* @return an ObservableSource that emits the items emitted by the source ObservableSource or the items of an
* alternate ObservableSource if the source ObservableSource is empty.
* @since 1.1.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> switchIfEmpty(ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return RxJavaPlugins.onAssembly(new ObservableSwitchIfEmpty<T>(this, other));
}
/**
* Returns a new ObservableSource by applying a function that you supply to each item emitted by the source
* ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted
* of these ObservableSources.
* <p>
* The resulting ObservableSource completes if both the upstream ObservableSource and the last inner ObservableSource, if any, complete.
* If the upstream ObservableSource signals an onError, the inner ObservableSource is disposed and the error delivered in-sequence.
* <p>
* <img width="640" height="350" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the element type of the inner ObservableSources and the output
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @return an Observable that emits the items emitted by the ObservableSource returned from applying {@code func} to the most recently emitted item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> switchMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
return switchMap(mapper, bufferSize());
}
/**
* Returns a new ObservableSource by applying a function that you supply to each item emitted by the source
* ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted
* of these ObservableSources.
* <p>
* The resulting ObservableSource completes if both the upstream ObservableSource and the last inner ObservableSource, if any, complete.
* If the upstream ObservableSource signals an onError, the inner ObservableSource is disposed and the error delivered in-sequence.
* <p>
* <img width="640" height="350" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the element type of the inner ObservableSources and the output
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param bufferSize
* the number of elements to prefetch from the current active inner ObservableSource
* @return an Observable that emits the items emitted by the ObservableSource returned from applying {@code func} to the most recently emitted item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> switchMap(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int bufferSize) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
if (this instanceof ScalarCallable) {
@SuppressWarnings("unchecked")
T v = ((ScalarCallable<T>)this).call();
if (v == null) {
return empty();
}
return ObservableScalarXMap.scalarXMap(v, mapper);
}
return RxJavaPlugins.onAssembly(new ObservableSwitchMap<T, R>(this, mapper, bufferSize, false));
}
/**
* Returns a new ObservableSource by applying a function that you supply to each item emitted by the source
* ObservableSource that returns a SingleSource, and then emitting the item emitted by the most recently emitted
* of these SingleSources.
* <p>
* The resulting ObservableSource completes if both the upstream ObservableSource and the last inner SingleSource, if any, complete.
* If the upstream ObservableSource signals an onError, the inner SingleSource is disposed and the error delivered in-sequence.
* <p>
* <img width="640" height="350" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchMapSingle} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the element type of the inner SingleSources and the output
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns a
* SingleSource
* @return an Observable that emits the item emitted by the SingleSource returned from applying {@code func} to the most recently emitted item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0.8
*/
@Experimental
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@NonNull
public final <R> Observable<R> switchMapSingle(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
return ObservableInternalHelper.switchMapSingle(this, mapper);
}
/**
* Returns a new ObservableSource by applying a function that you supply to each item emitted by the source
* ObservableSource that returns a SingleSource, and then emitting the item emitted by the most recently emitted
* of these SingleSources and delays any error until all SingleSources terminate.
* <p>
* The resulting ObservableSource completes if both the upstream ObservableSource and the last inner SingleSource, if any, complete.
* If the upstream ObservableSource signals an onError, the termination of the last inner SingleSource will emit that error as is
* or wrapped into a CompositeException along with the other possible errors the former inner SingleSources signalled.
* <p>
* <img width="640" height="350" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchMapSingleDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the element type of the inner SingleSources and the output
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns a
* SingleSource
* @return an Observable that emits the item emitted by the SingleSource returned from applying {@code func} to the most recently emitted item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0.8
*/
@Experimental
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
@NonNull
public final <R> Observable<R> switchMapSingleDelayError(@NonNull Function<? super T, ? extends SingleSource<? extends R>> mapper) {
return ObservableInternalHelper.switchMapSingleDelayError(this, mapper);
}
/**
* Returns a new ObservableSource by applying a function that you supply to each item emitted by the source
* ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted
* of these ObservableSources and delays any error until all ObservableSources terminate.
* <p>
* The resulting ObservableSource completes if both the upstream ObservableSource and the last inner ObservableSource, if any, complete.
* If the upstream ObservableSource signals an onError, the termination of the last inner ObservableSource will emit that error as is
* or wrapped into a CompositeException along with the other possible errors the former inner ObservableSources signalled.
* <p>
* <img width="640" height="350" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchMapDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the element type of the inner ObservableSources and the output
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @return an Observable that emits the items emitted by the ObservableSource returned from applying {@code func} to the most recently emitted item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> switchMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper) {
return switchMapDelayError(mapper, bufferSize());
}
/**
* Returns a new ObservableSource by applying a function that you supply to each item emitted by the source
* ObservableSource that returns an ObservableSource, and then emitting the items emitted by the most recently emitted
* of these ObservableSources and delays any error until all ObservableSources terminate.
* <p>
* The resulting ObservableSource completes if both the upstream ObservableSource and the last inner ObservableSource, if any, complete.
* If the upstream ObservableSource signals an onError, the termination of the last inner ObservableSource will emit that error as is
* or wrapped into a CompositeException along with the other possible errors the former inner ObservableSources signalled.
* <p>
* <img width="640" height="350" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/switchMap.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code switchMapDelayError} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the element type of the inner ObservableSources and the output
* @param mapper
* a function that, when applied to an item emitted by the source ObservableSource, returns an
* ObservableSource
* @param bufferSize
* the number of elements to prefetch from the current active inner ObservableSource
* @return an Observable that emits the items emitted by the ObservableSource returned from applying {@code func} to the most recently emitted item emitted by the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/flatmap.html">ReactiveX operators documentation: FlatMap</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> switchMapDelayError(Function<? super T, ? extends ObservableSource<? extends R>> mapper, int bufferSize) {
ObjectHelper.requireNonNull(mapper, "mapper is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
if (this instanceof ScalarCallable) {
@SuppressWarnings("unchecked")
T v = ((ScalarCallable<T>)this).call();
if (v == null) {
return empty();
}
return ObservableScalarXMap.scalarXMap(v, mapper);
}
return RxJavaPlugins.onAssembly(new ObservableSwitchMap<T, R>(this, mapper, bufferSize, true));
}
/**
* Returns an Observable that emits only the first {@code count} items emitted by the source ObservableSource. If the source emits fewer than
* {@code count} items then all of its items are emitted.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/take.png" alt="">
* <p>
* This method returns an ObservableSource that will invoke a subscribing {@link Observer}'s
* {@link Observer#onNext onNext} function a maximum of {@code count} times before invoking
* {@link Observer#onComplete onComplete}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code take} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum number of items to emit
* @return an Observable that emits only the first {@code count} items emitted by the source ObservableSource, or
* all of the items from the source ObservableSource if that ObservableSource emits fewer than {@code count} items
* @see <a href="http://reactivex.io/documentation/operators/take.html">ReactiveX operators documentation: Take</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> take(long count) {
if (count < 0) {
throw new IllegalArgumentException("count >= 0 required but it was " + count);
}
return RxJavaPlugins.onAssembly(new ObservableTake<T>(this, count));
}
/**
* Returns an Observable that emits those items emitted by source ObservableSource before a specified time runs
* out.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/take.t.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code take} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @return an Observable that emits those items emitted by the source ObservableSource before the time runs out
* @see <a href="http://reactivex.io/documentation/operators/take.html">ReactiveX operators documentation: Take</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> take(long time, TimeUnit unit) {
return takeUntil(timer(time, unit));
}
/**
* Returns an Observable that emits those items emitted by source ObservableSource before a specified time (on a
* specified Scheduler) runs out.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/take.ts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the Scheduler used for time source
* @return an Observable that emits those items emitted by the source ObservableSource before the time runs out,
* according to the specified Scheduler
* @see <a href="http://reactivex.io/documentation/operators/take.html">ReactiveX operators documentation: Take</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> take(long time, TimeUnit unit, Scheduler scheduler) {
return takeUntil(timer(time, unit, scheduler));
}
/**
* Returns an Observable that emits at most the last {@code count} items emitted by the source ObservableSource. If the source emits fewer than
* {@code count} items then all of its items are emitted.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.n.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code takeLast} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum number of items to emit from the end of the sequence of items emitted by the source
* ObservableSource
* @return an Observable that emits at most the last {@code count} items emitted by the source ObservableSource
* @throws IndexOutOfBoundsException
* if {@code count} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> takeLast(int count) {
if (count < 0) {
throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
} else
if (count == 0) {
return RxJavaPlugins.onAssembly(new ObservableIgnoreElements<T>(this));
} else
if (count == 1) {
return RxJavaPlugins.onAssembly(new ObservableTakeLastOne<T>(this));
}
return RxJavaPlugins.onAssembly(new ObservableTakeLast<T>(this, count));
}
/**
* Returns an Observable that emits at most a specified number of items from the source ObservableSource that were
* emitted in a specified window of time before the ObservableSource completed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.tn.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code takeLast} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum number of items to emit
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @return an Observable that emits at most {@code count} items from the source ObservableSource that were emitted
* in a specified window of time before the ObservableSource completed
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.TRAMPOLINE)
public final Observable<T> takeLast(long count, long time, TimeUnit unit) {
return takeLast(count, time, unit, Schedulers.trampoline(), false, bufferSize());
}
/**
* Returns an Observable that emits at most a specified number of items from the source ObservableSource that were
* emitted in a specified window of time before the ObservableSource completed, where the timing information is
* provided by a given Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.tns.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use for tracking the current time</dd>
* </dl>
*
* @param count
* the maximum number of items to emit
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the {@link Scheduler} that provides the timestamps for the observed items
* @return an Observable that emits at most {@code count} items from the source ObservableSource that were emitted
* in a specified window of time before the ObservableSource completed, where the timing information is
* provided by the given {@code scheduler}
* @throws IndexOutOfBoundsException
* if {@code count} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> takeLast(long count, long time, TimeUnit unit, Scheduler scheduler) {
return takeLast(count, time, unit, scheduler, false, bufferSize());
}
/**
* Returns an Observable that emits at most a specified number of items from the source ObservableSource that were
* emitted in a specified window of time before the ObservableSource completed, where the timing information is
* provided by a given Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.tns.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use for tracking the current time</dd>
* </dl>
*
* @param count
* the maximum number of items to emit
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the {@link Scheduler} that provides the timestamps for the observed items
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @param bufferSize
* the hint about how many elements to expect to be last
* @return an Observable that emits at most {@code count} items from the source ObservableSource that were emitted
* in a specified window of time before the ObservableSource completed, where the timing information is
* provided by the given {@code scheduler}
* @throws IndexOutOfBoundsException
* if {@code count} is less than zero
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> takeLast(long count, long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
if (count < 0) {
throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
}
return RxJavaPlugins.onAssembly(new ObservableTakeLastTimed<T>(this, count, time, unit, scheduler, bufferSize, delayError));
}
/**
* Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified
* window of time before the ObservableSource completed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.t.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code takeLast} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @return an Observable that emits the items from the source ObservableSource that were emitted in the window of
* time before the ObservableSource completed specified by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.TRAMPOLINE)
public final Observable<T> takeLast(long time, TimeUnit unit) {
return takeLast(time, unit, Schedulers.trampoline(), false, bufferSize());
}
/**
* Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified
* window of time before the ObservableSource completed.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.t.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code takeLast} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @return an Observable that emits the items from the source ObservableSource that were emitted in the window of
* time before the ObservableSource completed specified by {@code time}
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.TRAMPOLINE)
public final Observable<T> takeLast(long time, TimeUnit unit, boolean delayError) {
return takeLast(time, unit, Schedulers.trampoline(), delayError, bufferSize());
}
/**
* Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified
* window of time before the ObservableSource completed, where the timing information is provided by a specified
* Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.ts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the Scheduler that provides the timestamps for the Observed items
* @return an Observable that emits the items from the source ObservableSource that were emitted in the window of
* time before the ObservableSource completed specified by {@code time}, where the timing information is
* provided by {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> takeLast(long time, TimeUnit unit, Scheduler scheduler) {
return takeLast(time, unit, scheduler, false, bufferSize());
}
/**
* Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified
* window of time before the ObservableSource completed, where the timing information is provided by a specified
* Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.ts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the Scheduler that provides the timestamps for the Observed items
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @return an Observable that emits the items from the source ObservableSource that were emitted in the window of
* time before the ObservableSource completed specified by {@code time}, where the timing information is
* provided by {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> takeLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError) {
return takeLast(time, unit, scheduler, delayError, bufferSize());
}
/**
* Returns an Observable that emits the items from the source ObservableSource that were emitted in a specified
* window of time before the ObservableSource completed, where the timing information is provided by a specified
* Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.ts.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param time
* the length of the time window
* @param unit
* the time unit of {@code time}
* @param scheduler
* the Scheduler that provides the timestamps for the Observed items
* @param delayError
* if true, an exception signalled by the current Observable is delayed until the regular elements are consumed
* by the downstream; if false, an exception is immediately signalled and all regular elements dropped
* @param bufferSize
* the hint about how many elements to expect to be last
* @return an Observable that emits the items from the source ObservableSource that were emitted in the window of
* time before the ObservableSource completed specified by {@code time}, where the timing information is
* provided by {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> takeLast(long time, TimeUnit unit, Scheduler scheduler, boolean delayError, int bufferSize) {
return takeLast(Long.MAX_VALUE, time, unit, scheduler, delayError, bufferSize);
}
/**
* Returns an Observable that emits the items emitted by the source Observable until a second ObservableSource
* emits an item.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeUntil.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code takeUntil} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param other
* the ObservableSource whose first emitted item will cause {@code takeUntil} to stop emitting items
* from the source Observable
* @param <U>
* the type of items emitted by {@code other}
* @return an Observable that emits the items emitted by the source Observable until such time as {@code other} emits its first item
* @see <a href="http://reactivex.io/documentation/operators/takeuntil.html">ReactiveX operators documentation: TakeUntil</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U> Observable<T> takeUntil(ObservableSource<U> other) {
ObjectHelper.requireNonNull(other, "other is null");
return RxJavaPlugins.onAssembly(new ObservableTakeUntil<T, U>(this, other));
}
/**
* Returns an Observable that emits items emitted by the source Observable, checks the specified predicate
* for each item, and then completes when the condition is satisfied.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeUntil.p.png" alt="">
* <p>
* The difference between this operator and {@link #takeWhile(Predicate)} is that here, the condition is
* evaluated <em>after</em> the item is emitted.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code takeUntil} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param stopPredicate
* a function that evaluates an item emitted by the source Observable and returns a Boolean
* @return an Observable that first emits items emitted by the source Observable, checks the specified
* condition after each item, and then completes when the condition is satisfied.
* @see <a href="http://reactivex.io/documentation/operators/takeuntil.html">ReactiveX operators documentation: TakeUntil</a>
* @see Observable#takeWhile(Predicate)
* @since 1.1.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> takeUntil(Predicate<? super T> stopPredicate) {
ObjectHelper.requireNonNull(stopPredicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableTakeUntilPredicate<T>(this, stopPredicate));
}
/**
* Returns an Observable that emits items emitted by the source ObservableSource so long as each item satisfied a
* specified condition, and then completes as soon as this condition is not satisfied.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeWhile.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code takeWhile} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param predicate
* a function that evaluates an item emitted by the source ObservableSource and returns a Boolean
* @return an Observable that emits the items from the source ObservableSource so long as each item satisfies the
* condition defined by {@code predicate}, then completes
* @see <a href="http://reactivex.io/documentation/operators/takewhile.html">ReactiveX operators documentation: TakeWhile</a>
* @see Observable#takeUntil(Predicate)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<T> takeWhile(Predicate<? super T> predicate) {
ObjectHelper.requireNonNull(predicate, "predicate is null");
return RxJavaPlugins.onAssembly(new ObservableTakeWhile<T>(this, predicate));
}
/**
* Returns an Observable that emits only the first item emitted by the source ObservableSource during sequential
* time windows of a specified duration.
* <p>
* This differs from {@link #throttleLast} in that this only tracks passage of time whereas
* {@link #throttleLast} ticks at scheduled intervals.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleFirst.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code throttleFirst} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param windowDuration
* time to wait before emitting another item after emitting the last item
* @param unit
* the unit of time of {@code windowDuration}
* @return an Observable that performs the throttle operation
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> throttleFirst(long windowDuration, TimeUnit unit) {
return throttleFirst(windowDuration, unit, Schedulers.computation());
}
/**
* Returns an Observable that emits only the first item emitted by the source ObservableSource during sequential
* time windows of a specified duration, where the windows are managed by a specified Scheduler.
* <p>
* This differs from {@link #throttleLast} in that this only tracks passage of time whereas
* {@link #throttleLast} ticks at scheduled intervals.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleFirst.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param skipDuration
* time to wait before emitting another item after emitting the last item
* @param unit
* the unit of time of {@code skipDuration}
* @param scheduler
* the {@link Scheduler} to use internally to manage the timers that handle timeout for each
* event
* @return an Observable that performs the throttle operation
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> throttleFirst(long skipDuration, TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableThrottleFirstTimed<T>(this, skipDuration, unit, scheduler));
}
/**
* Returns an Observable that emits only the last item emitted by the source ObservableSource during sequential
* time windows of a specified duration.
* <p>
* This differs from {@link #throttleFirst} in that this ticks along at a scheduled interval whereas
* {@link #throttleFirst} does not tick, it just tracks passage of time.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLast.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code throttleLast} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param intervalDuration
* duration of windows within which the last item emitted by the source ObservableSource will be
* emitted
* @param unit
* the unit of time of {@code intervalDuration}
* @return an Observable that performs the throttle operation
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @see #sample(long, TimeUnit)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> throttleLast(long intervalDuration, TimeUnit unit) {
return sample(intervalDuration, unit);
}
/**
* Returns an Observable that emits only the last item emitted by the source ObservableSource during sequential
* time windows of a specified duration, where the duration is governed by a specified Scheduler.
* <p>
* This differs from {@link #throttleFirst} in that this ticks along at a scheduled interval whereas
* {@link #throttleFirst} does not tick, it just tracks passage of time.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleLast.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param intervalDuration
* duration of windows within which the last item emitted by the source ObservableSource will be
* emitted
* @param unit
* the unit of time of {@code intervalDuration}
* @param scheduler
* the {@link Scheduler} to use internally to manage the timers that handle timeout for each
* event
* @return an Observable that performs the throttle operation
* @see <a href="http://reactivex.io/documentation/operators/sample.html">ReactiveX operators documentation: Sample</a>
* @see #sample(long, TimeUnit, Scheduler)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> throttleLast(long intervalDuration, TimeUnit unit, Scheduler scheduler) {
return sample(intervalDuration, unit, scheduler);
}
/**
* Returns an Observable that only emits those items emitted by the source ObservableSource that are not followed
* by another emitted item within a specified time window.
* <p>
* <em>Note:</em> If the source ObservableSource keeps emitting items more frequently than the length of the time
* window then no items will be emitted by the resulting ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleWithTimeout.png" alt="">
* <p>
* Information on debounce vs throttle:
* <p>
* <ul>
* <li><a href="http://drupalmotion.com/article/debounce-and-throttle-visual-explanation">Debounce and Throttle: visual explanation</a></li>
* <li><a href="http://unscriptable.com/2009/03/20/debouncing-javascript-methods/">Debouncing: javascript methods</a></li>
* <li><a href="http://www.illyriad.co.uk/blog/index.php/2011/09/javascript-dont-spam-your-server-debounce-and-throttle/">Javascript - don't spam your server: debounce and throttle</a></li>
* </ul>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code throttleWithTimeout} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timeout
* the length of the window of time that must pass after the emission of an item from the source
* ObservableSource in which that ObservableSource emits no items in order for the item to be emitted by the
* resulting ObservableSource
* @param unit
* the {@link TimeUnit} of {@code timeout}
* @return an Observable that filters out items that are too quickly followed by newer items
* @see <a href="http://reactivex.io/documentation/operators/debounce.html">ReactiveX operators documentation: Debounce</a>
* @see #debounce(long, TimeUnit)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> throttleWithTimeout(long timeout, TimeUnit unit) {
return debounce(timeout, unit);
}
/**
* Returns an Observable that only emits those items emitted by the source ObservableSource that are not followed
* by another emitted item within a specified time window, where the time window is governed by a specified
* Scheduler.
* <p>
* <em>Note:</em> If the source ObservableSource keeps emitting items more frequently than the length of the time
* window then no items will be emitted by the resulting ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/throttleWithTimeout.s.png" alt="">
* <p>
* Information on debounce vs throttle:
* <p>
* <ul>
* <li><a href="http://drupalmotion.com/article/debounce-and-throttle-visual-explanation">Debounce and Throttle: visual explanation</a></li>
* <li><a href="http://unscriptable.com/2009/03/20/debouncing-javascript-methods/">Debouncing: javascript methods</a></li>
* <li><a href="http://www.illyriad.co.uk/blog/index.php/2011/09/javascript-dont-spam-your-server-debounce-and-throttle/">Javascript - don't spam your server: debounce and throttle</a></li>
* </ul>
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timeout
* the length of the window of time that must pass after the emission of an item from the source
* ObservableSource in which that ObservableSource emits no items in order for the item to be emitted by the
* resulting ObservableSource
* @param unit
* the {@link TimeUnit} of {@code timeout}
* @param scheduler
* the {@link Scheduler} to use internally to manage the timers that handle the timeout for each
* item
* @return an Observable that filters out items that are too quickly followed by newer items
* @see <a href="http://reactivex.io/documentation/operators/debounce.html">ReactiveX operators documentation: Debounce</a>
* @see #debounce(long, TimeUnit, Scheduler)
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> throttleWithTimeout(long timeout, TimeUnit unit, Scheduler scheduler) {
return debounce(timeout, unit, scheduler);
}
/**
* Returns an Observable that emits records of the time interval between consecutive items emitted by the
* source ObservableSource.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeInterval.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timeInterval} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that emits time interval information items
* @see <a href="http://reactivex.io/documentation/operators/timeinterval.html">ReactiveX operators documentation: TimeInterval</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Timed<T>> timeInterval() {
return timeInterval(TimeUnit.MILLISECONDS, Schedulers.computation());
}
/**
* Returns an Observable that emits records of the time interval between consecutive items emitted by the
* source ObservableSource, where this interval is computed on a specified Scheduler.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeInterval.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>The operator does not operate on any particular scheduler but uses the current time
* from the specified {@link Scheduler}.</dd>
* </dl>
*
* @param scheduler
* the {@link Scheduler} used to compute time intervals
* @return an Observable that emits time interval information items
* @see <a href="http://reactivex.io/documentation/operators/timeinterval.html">ReactiveX operators documentation: TimeInterval</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
public final Observable<Timed<T>> timeInterval(Scheduler scheduler) {
return timeInterval(TimeUnit.MILLISECONDS, scheduler);
}
/**
* Returns an Observable that emits records of the time interval between consecutive items emitted by the
* source ObservableSource.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeInterval.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timeInterval} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param unit the time unit for the current time
* @return an Observable that emits time interval information items
* @see <a href="http://reactivex.io/documentation/operators/timeinterval.html">ReactiveX operators documentation: TimeInterval</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE) // Trampoline scheduler is only used for creating timestamps.
public final Observable<Timed<T>> timeInterval(TimeUnit unit) {
return timeInterval(unit, Schedulers.computation());
}
/**
* Returns an Observable that emits records of the time interval between consecutive items emitted by the
* source ObservableSource, where this interval is computed on a specified Scheduler.
* <p>
* <img width="640" height="315" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeInterval.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>The operator does not operate on any particular scheduler but uses the current time
* from the specified {@link Scheduler}.</dd>
* </dl>
*
* @param unit the time unit for the current time
* @param scheduler
* the {@link Scheduler} used to compute time intervals
* @return an Observable that emits time interval information items
* @see <a href="http://reactivex.io/documentation/operators/timeinterval.html">ReactiveX operators documentation: TimeInterval</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
public final Observable<Timed<T>> timeInterval(TimeUnit unit, Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableTimeInterval<T>(this, unit, scheduler));
}
/**
* Returns an Observable that mirrors the source ObservableSource, but notifies observers of a
* {@code TimeoutException} if an item emitted by the source ObservableSource doesn't arrive within a window of
* time after the emission of the previous item, where that period of time is measured by an ObservableSource that
* is a function of the previous item.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout3.png" alt="">
* <p>
* Note: The arrival of the first source item is never timed out.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code timeout} operates by default on the {@code immediate} {@link Scheduler}.</dd>
* </dl>
*
* @param <V>
* the timeout value type (ignored)
* @param itemTimeoutIndicator
* a function that returns an ObservableSource for each item emitted by the source
* ObservableSource and that determines the timeout window for the subsequent item
* @return an Observable that mirrors the source ObservableSource, but notifies observers of a
* {@code TimeoutException} if an item emitted by the source ObservableSource takes longer to arrive than
* the time window defined by the selector for the previously emitted item
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <V> Observable<T> timeout(Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator) {
return timeout0(null, itemTimeoutIndicator, null);
}
/**
* Returns an Observable that mirrors the source ObservableSource, but that switches to a fallback ObservableSource if
* an item emitted by the source ObservableSource doesn't arrive within a window of time after the emission of the
* previous item, where that period of time is measured by an ObservableSource that is a function of the previous
* item.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout4.png" alt="">
* <p>
* Note: The arrival of the first source item is never timed out.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code timeout} operates by default on the {@code immediate} {@link Scheduler}.</dd>
* </dl>
*
* @param <V>
* the timeout value type (ignored)
* @param itemTimeoutIndicator
* a function that returns an ObservableSource, for each item emitted by the source ObservableSource, that
* determines the timeout window for the subsequent item
* @param other
* the fallback ObservableSource to switch to if the source ObservableSource times out
* @return an Observable that mirrors the source ObservableSource, but switches to mirroring a fallback ObservableSource
* if an item emitted by the source ObservableSource takes longer to arrive than the time window defined
* by the selector for the previously emitted item
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <V> Observable<T> timeout(Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator,
ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return timeout0(null, itemTimeoutIndicator, other);
}
/**
* Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted
* item. If the next item isn't emitted within the specified timeout duration starting from its predecessor,
* the resulting ObservableSource terminates and notifies observers of a {@code TimeoutException}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout.1.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code timeout} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timeout
* maximum duration between emitted items before a timeout occurs
* @param timeUnit
* the unit of time that applies to the {@code timeout} argument.
* @return the source ObservableSource modified to notify observers of a {@code TimeoutException} in case of a
* timeout
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> timeout(long timeout, TimeUnit timeUnit) {
return timeout0(timeout, timeUnit, null, Schedulers.computation());
}
/**
* Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted
* item. If the next item isn't emitted within the specified timeout duration starting from its predecessor,
* the resulting ObservableSource begins instead to mirror a fallback ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code timeout} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timeout
* maximum duration between items before a timeout occurs
* @param timeUnit
* the unit of time that applies to the {@code timeout} argument
* @param other
* the fallback ObservableSource to use in case of a timeout
* @return the source ObservableSource modified to switch to the fallback ObservableSource in case of a timeout
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<T> timeout(long timeout, TimeUnit timeUnit, ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return timeout0(timeout, timeUnit, other, Schedulers.computation());
}
/**
* Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted
* item using a specified Scheduler. If the next item isn't emitted within the specified timeout duration
* starting from its predecessor, the resulting ObservableSource begins instead to mirror a fallback ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout.2s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timeout
* maximum duration between items before a timeout occurs
* @param timeUnit
* the unit of time that applies to the {@code timeout} argument
* @param scheduler
* the {@link Scheduler} to run the timeout timers on
* @param other
* the ObservableSource to use as the fallback in case of a timeout
* @return the source ObservableSource modified so that it will switch to the fallback ObservableSource in case of a
* timeout
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler, ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(other, "other is null");
return timeout0(timeout, timeUnit, other, scheduler);
}
/**
* Returns an Observable that mirrors the source ObservableSource but applies a timeout policy for each emitted
* item, where this policy is governed on a specified Scheduler. If the next item isn't emitted within the
* specified timeout duration starting from its predecessor, the resulting ObservableSource terminates and
* notifies observers of a {@code TimeoutException}.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout.1s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timeout
* maximum duration between items before a timeout occurs
* @param timeUnit
* the unit of time that applies to the {@code timeout} argument
* @param scheduler
* the Scheduler to run the timeout timers on
* @return the source ObservableSource modified to notify observers of a {@code TimeoutException} in case of a
* timeout
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> timeout(long timeout, TimeUnit timeUnit, Scheduler scheduler) {
return timeout0(timeout, timeUnit, null, scheduler);
}
/**
* Returns an Observable that mirrors the source ObservableSource, but notifies observers of a
* {@code TimeoutException} if either the first item emitted by the source ObservableSource or any subsequent item
* doesn't arrive within time windows defined by other ObservableSources.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout5.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code timeout} operates by default on the {@code immediate} {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the first timeout value type (ignored)
* @param <V>
* the subsequent timeout value type (ignored)
* @param firstTimeoutIndicator
* a function that returns an ObservableSource that determines the timeout window for the first source
* item
* @param itemTimeoutIndicator
* a function that returns an ObservableSource for each item emitted by the source ObservableSource and that
* determines the timeout window in which the subsequent source item must arrive in order to
* continue the sequence
* @return an Observable that mirrors the source ObservableSource, but notifies observers of a
* {@code TimeoutException} if either the first item or any subsequent item doesn't arrive within
* the time windows specified by the timeout selectors
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, V> Observable<T> timeout(ObservableSource<U> firstTimeoutIndicator,
Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator) {
ObjectHelper.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
return timeout0(firstTimeoutIndicator, itemTimeoutIndicator, null);
}
/**
* Returns an Observable that mirrors the source ObservableSource, but switches to a fallback ObservableSource if either
* the first item emitted by the source ObservableSource or any subsequent item doesn't arrive within time windows
* defined by other ObservableSources.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timeout6.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code timeout} operates by default on the {@code immediate} {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the first timeout value type (ignored)
* @param <V>
* the subsequent timeout value type (ignored)
* @param firstTimeoutIndicator
* a function that returns an ObservableSource which determines the timeout window for the first source
* item
* @param itemTimeoutIndicator
* a function that returns an ObservableSource for each item emitted by the source ObservableSource and that
* determines the timeout window in which the subsequent source item must arrive in order to
* continue the sequence
* @param other
* the fallback ObservableSource to switch to if the source ObservableSource times out
* @return an Observable that mirrors the source ObservableSource, but switches to the {@code other} ObservableSource if
* either the first item emitted by the source ObservableSource or any subsequent item doesn't arrive
* within time windows defined by the timeout selectors
* @throws NullPointerException
* if {@code itemTimeoutIndicator} is null, or
* if {@code other} is null
* @see <a href="http://reactivex.io/documentation/operators/timeout.html">ReactiveX operators documentation: Timeout</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, V> Observable<T> timeout(
ObservableSource<U> firstTimeoutIndicator,
Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator,
ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(firstTimeoutIndicator, "firstTimeoutIndicator is null");
ObjectHelper.requireNonNull(other, "other is null");
return timeout0(firstTimeoutIndicator, itemTimeoutIndicator, other);
}
private Observable<T> timeout0(long timeout, TimeUnit timeUnit, ObservableSource<? extends T> other,
Scheduler scheduler) {
ObjectHelper.requireNonNull(timeUnit, "timeUnit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableTimeoutTimed<T>(this, timeout, timeUnit, scheduler, other));
}
private <U, V> Observable<T> timeout0(
ObservableSource<U> firstTimeoutIndicator,
Function<? super T, ? extends ObservableSource<V>> itemTimeoutIndicator,
ObservableSource<? extends T> other) {
ObjectHelper.requireNonNull(itemTimeoutIndicator, "itemTimeoutIndicator is null");
return RxJavaPlugins.onAssembly(new ObservableTimeout<T, U, V>(this, firstTimeoutIndicator, itemTimeoutIndicator, other));
}
/**
* Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a
* {@link Timed} object.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timestamp.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timestamp} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @return an Observable that emits timestamped items from the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/timestamp.html">ReactiveX operators documentation: Timestamp</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Timed<T>> timestamp() {
return timestamp(TimeUnit.MILLISECONDS, Schedulers.computation());
}
/**
* Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a
* {@link Timed} object whose timestamps are provided by a specified Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timestamp.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate on any particular scheduler but uses the current time
* from the specified {@link Scheduler}.</dd>
* </dl>
*
* @param scheduler
* the {@link Scheduler} to use as a time source
* @return an Observable that emits timestamped items from the source ObservableSource with timestamps provided by
* the {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/timestamp.html">ReactiveX operators documentation: Timestamp</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
public final Observable<Timed<T>> timestamp(Scheduler scheduler) {
return timestamp(TimeUnit.MILLISECONDS, scheduler);
}
/**
* Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a
* {@link Timed} object.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timestamp.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code timestamp} does not operate on any particular scheduler but uses the current time
* from the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param unit the time unit for the current time
* @return an Observable that emits timestamped items from the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/timestamp.html">ReactiveX operators documentation: Timestamp</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Timed<T>> timestamp(TimeUnit unit) {
return timestamp(unit, Schedulers.computation());
}
/**
* Returns an Observable that emits each item emitted by the source ObservableSource, wrapped in a
* {@link Timed} object whose timestamps are provided by a specified Scheduler.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/timestamp.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate on any particular scheduler but uses the current time
* from the specified {@link Scheduler}.</dd>
* </dl>
*
* @param unit the time unit for the current time
* @param scheduler
* the {@link Scheduler} to use as a time source
* @return an Observable that emits timestamped items from the source ObservableSource with timestamps provided by
* the {@code scheduler}
* @see <a href="http://reactivex.io/documentation/operators/timestamp.html">ReactiveX operators documentation: Timestamp</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE) // Supplied scheduler is only used for creating timestamps.
public final Observable<Timed<T>> timestamp(final TimeUnit unit, final Scheduler scheduler) {
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return map(Functions.<T>timestampWith(unit, scheduler));
}
/**
* Calls the specified converter function during assembly time and returns its resulting value.
* <p>
* This allows fluent conversion to any other type.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code to} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param <R> the resulting object type
* @param converter the function that receives the current Observable instance and returns a value
* @return the value returned by the function
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> R to(Function<? super Observable<T>, R> converter) {
try {
return ObjectHelper.requireNonNull(converter, "converter is null").apply(this);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
throw ExceptionHelper.wrapOrThrow(ex);
}
}
/**
* Returns a Single that emits a single item, a list composed of all the items emitted by the source
* ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toList.2.png" alt="">
* <p>
* Normally, an ObservableSource that returns multiple items will do so by invoking its {@link Observer}'s
* {@link Observer#onNext onNext} method for each such item. You can change this behavior, instructing the
* ObservableSource to compose a list of all of these items and then to invoke the Observer's {@code onNext}
* function once, passing it the entire list, by calling the ObservableSource's {@code toList} method prior to
* calling its {@link #subscribe} method.
* <p>
* Be careful not to use this operator on ObservableSources that emit infinite or very large numbers of items, as
* you do not have the option to dispose.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @return a Single that emits a single item: a List containing all of the items emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<List<T>> toList() {
return toList(16);
}
/**
* Returns a Single that emits a single item, a list composed of all the items emitted by the source
* ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toList.2.png" alt="">
* <p>
* Normally, an ObservableSource that returns multiple items will do so by invoking its {@link Observer}'s
* {@link Observer#onNext onNext} method for each such item. You can change this behavior, instructing the
* ObservableSource to compose a list of all of these items and then to invoke the Observer's {@code onNext}
* function once, passing it the entire list, by calling the ObservableSource's {@code toList} method prior to
* calling its {@link #subscribe} method.
* <p>
* Be careful not to use this operator on ObservableSources that emit infinite or very large numbers of items, as
* you do not have the option to dispose.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param capacityHint
* the number of elements expected from the current Observable
* @return a Single that emits a single item: a List containing all of the items emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<List<T>> toList(final int capacityHint) {
ObjectHelper.verifyPositive(capacityHint, "capacityHint");
return RxJavaPlugins.onAssembly(new ObservableToListSingle<T, List<T>>(this, capacityHint));
}
/**
* Returns a Single that emits a single item, a list composed of all the items emitted by the source
* ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toList.2.png" alt="">
* <p>
* Normally, an ObservableSource that returns multiple items will do so by invoking its {@link Observer}'s
* {@link Observer#onNext onNext} method for each such item. You can change this behavior, instructing the
* ObservableSource to compose a list of all of these items and then to invoke the Observer's {@code onNext}
* function once, passing it the entire list, by calling the ObservableSource's {@code toList} method prior to
* calling its {@link #subscribe} method.
* <p>
* Be careful not to use this operator on ObservableSources that emit infinite or very large numbers of items, as
* you do not have the option to dispose.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the subclass of a collection of Ts
* @param collectionSupplier
* the Callable returning the collection (for each individual Observer) to be filled in
* @return a Single that emits a single item: a List containing all of the items emitted by the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U extends Collection<? super T>> Single<U> toList(Callable<U> collectionSupplier) {
ObjectHelper.requireNonNull(collectionSupplier, "collectionSupplier is null");
return RxJavaPlugins.onAssembly(new ObservableToListSingle<T, U>(this, collectionSupplier));
}
/**
* Returns a Single that emits a single HashMap containing all items emitted by the source ObservableSource,
* mapped by the keys returned by a specified {@code keySelector} function.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMap.2.png" alt="">
* <p>
* If more than one source item maps to the same key, the HashMap will contain the latest of those items.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param keySelector
* the function that extracts the key from a source item to be used in the HashMap
* @return a Single that emits a single item: a HashMap containing the mapped items from the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Single<Map<K, T>> toMap(final Function<? super T, ? extends K> keySelector) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
return collect(HashMapSupplier.<K, T>asCallable(), Functions.toMapKeySelector(keySelector));
}
/**
* Returns a Single that emits a single HashMap containing values corresponding to items emitted by the
* source ObservableSource, mapped by the keys returned by a specified {@code keySelector} function.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMap.2.png" alt="">
* <p>
* If more than one source item maps to the same key, the HashMap will contain a single entry that
* corresponds to the latest of those items.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param <V> the value type of the Map
* @param keySelector
* the function that extracts the key from a source item to be used in the HashMap
* @param valueSelector
* the function that extracts the value from a source item to be used in the HashMap
* @return a Single that emits a single item: a HashMap containing the mapped items from the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Single<Map<K, V>> toMap(
final Function<? super T, ? extends K> keySelector,
final Function<? super T, ? extends V> valueSelector) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
return collect(HashMapSupplier.<K, V>asCallable(), Functions.toMapKeyValueSelector(keySelector, valueSelector));
}
/**
* Returns a Single that emits a single Map, returned by a specified {@code mapFactory} function, that
* contains keys and values extracted from the items emitted by the source ObservableSource.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMap.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param <V> the value type of the Map
* @param keySelector
* the function that extracts the key from a source item to be used in the Map
* @param valueSelector
* the function that extracts the value from the source items to be used as value in the Map
* @param mapSupplier
* the function that returns a Map instance to be used
* @return a Single that emits a single item: a Map that contains the mapped items emitted by the
* source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Single<Map<K, V>> toMap(
final Function<? super T, ? extends K> keySelector,
final Function<? super T, ? extends V> valueSelector,
Callable<? extends Map<K, V>> mapSupplier) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
ObjectHelper.requireNonNull(mapSupplier, "mapSupplier is null");
return collect(mapSupplier, Functions.toMapKeyValueSelector(keySelector, valueSelector));
}
/**
* Returns a Single that emits a single HashMap that contains an ArrayList of items emitted by the
* source ObservableSource keyed by a specified {@code keySelector} function.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMultiMap.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMultimap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param keySelector
* the function that extracts the key from the source items to be used as key in the HashMap
* @return a Single that emits a single item: a HashMap that contains an ArrayList of items mapped from
* the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K> Single<Map<K, Collection<T>>> toMultimap(Function<? super T, ? extends K> keySelector) {
@SuppressWarnings({ "rawtypes", "unchecked" })
Function<? super T, ? extends T> valueSelector = (Function)Functions.identity();
Callable<Map<K, Collection<T>>> mapSupplier = HashMapSupplier.asCallable();
Function<K, List<T>> collectionFactory = ArrayListSupplier.asFunction();
return toMultimap(keySelector, valueSelector, mapSupplier, collectionFactory);
}
/**
* Returns a Single that emits a single HashMap that contains an ArrayList of values extracted by a
* specified {@code valueSelector} function from items emitted by the source ObservableSource, keyed by a
* specified {@code keySelector} function.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMultiMap.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMultimap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param <V> the value type of the Map
* @param keySelector
* the function that extracts a key from the source items to be used as key in the HashMap
* @param valueSelector
* the function that extracts a value from the source items to be used as value in the HashMap
* @return a Single that emits a single item: a HashMap that contains an ArrayList of items mapped from
* the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Single<Map<K, Collection<V>>> toMultimap(Function<? super T, ? extends K> keySelector, Function<? super T, ? extends V> valueSelector) {
Callable<Map<K, Collection<V>>> mapSupplier = HashMapSupplier.asCallable();
Function<K, List<V>> collectionFactory = ArrayListSupplier.asFunction();
return toMultimap(keySelector, valueSelector, mapSupplier, collectionFactory);
}
/**
* Returns a Single that emits a single Map, returned by a specified {@code mapFactory} function, that
* contains a custom collection of values, extracted by a specified {@code valueSelector} function from
* items emitted by the source ObservableSource, and keyed by the {@code keySelector} function.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMultiMap.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMultimap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param <V> the value type of the Map
* @param keySelector
* the function that extracts a key from the source items to be used as the key in the Map
* @param valueSelector
* the function that extracts a value from the source items to be used as the value in the Map
* @param mapSupplier
* the function that returns a Map instance to be used
* @param collectionFactory
* the function that returns a Collection instance for a particular key to be used in the Map
* @return a Single that emits a single item: a Map that contains the collection of mapped items from
* the source ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Single<Map<K, Collection<V>>> toMultimap(
final Function<? super T, ? extends K> keySelector,
final Function<? super T, ? extends V> valueSelector,
final Callable<? extends Map<K, Collection<V>>> mapSupplier,
final Function<? super K, ? extends Collection<? super V>> collectionFactory) {
ObjectHelper.requireNonNull(keySelector, "keySelector is null");
ObjectHelper.requireNonNull(valueSelector, "valueSelector is null");
ObjectHelper.requireNonNull(mapSupplier, "mapSupplier is null");
ObjectHelper.requireNonNull(collectionFactory, "collectionFactory is null");
return collect(mapSupplier, Functions.toMultimapKeyValueSelector(keySelector, valueSelector, collectionFactory));
}
/**
* Returns a Single that emits a single Map, returned by a specified {@code mapFactory} function, that
* contains an ArrayList of values, extracted by a specified {@code valueSelector} function from items
* emitted by the source ObservableSource and keyed by the {@code keySelector} function.
* <p>
* <img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toMultiMap.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toMultimap} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <K> the key type of the Map
* @param <V> the value type of the Map
* @param keySelector
* the function that extracts a key from the source items to be used as the key in the Map
* @param valueSelector
* the function that extracts a value from the source items to be used as the value in the Map
* @param mapSupplier
* the function that returns a Map instance to be used
* @return a Single that emits a single item: a Map that contains a list items mapped from the source
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <K, V> Single<Map<K, Collection<V>>> toMultimap(
Function<? super T, ? extends K> keySelector,
Function<? super T, ? extends V> valueSelector,
Callable<Map<K, Collection<V>>> mapSupplier
) {
return toMultimap(keySelector, valueSelector, mapSupplier, ArrayListSupplier.<V, K>asFunction());
}
/**
* Converts the current Observable into a Flowable by applying the specified backpressure strategy.
* <dl>
* <dt><b>Backpressure:</b></dt>
* <dd>The operator applies the chosen backpressure strategy of {@link BackpressureStrategy} enum.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toFlowable} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param strategy the backpressure strategy to apply
* @return the new Flowable instance
*/
@BackpressureSupport(BackpressureKind.SPECIAL)
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Flowable<T> toFlowable(BackpressureStrategy strategy) {
Flowable<T> o = new FlowableFromObservable<T>(this);
switch (strategy) {
case DROP:
return o.onBackpressureDrop();
case LATEST:
return o.onBackpressureLatest();
case MISSING:
return o;
case ERROR:
return RxJavaPlugins.onAssembly(new FlowableOnBackpressureError<T>(o));
default:
return o.onBackpressureBuffer();
}
}
/**
* Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a
* sorted order. Each item emitted by the ObservableSource must implement {@link Comparable} with respect to all
* other items in the sequence.
*
* <p>If any item emitted by this Observable does not implement {@link Comparable} with respect to
* all other items emitted by this Observable, no items will be emitted and the
* sequence is terminated with a {@link ClassCastException}.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toSortedList.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toSortedList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return a Single that emits a list that contains the items emitted by the source ObservableSource in
* sorted order
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<List<T>> toSortedList() {
return toSortedList(Functions.naturalOrder());
}
/**
* Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a
* sorted order based on a specified comparison function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toSortedList.f.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toSortedList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param comparator
* a function that compares two items emitted by the source ObservableSource and returns an Integer
* that indicates their sort order
* @return a Single that emits a list that contains the items emitted by the source ObservableSource in
* sorted order
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<List<T>> toSortedList(final Comparator<? super T> comparator) {
ObjectHelper.requireNonNull(comparator, "comparator is null");
return toList().map(Functions.listSorter(comparator));
}
/**
* Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a
* sorted order based on a specified comparison function.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toSortedList.f.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toSortedList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param comparator
* a function that compares two items emitted by the source ObservableSource and returns an Integer
* that indicates their sort order
* @param capacityHint
* the initial capacity of the ArrayList used to accumulate items before sorting
* @return a Single that emits a list that contains the items emitted by the source ObservableSource in
* sorted order
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<List<T>> toSortedList(final Comparator<? super T> comparator, int capacityHint) {
ObjectHelper.requireNonNull(comparator, "comparator is null");
return toList(capacityHint).map(Functions.listSorter(comparator));
}
/**
* Returns a Single that emits a list that contains the items emitted by the source ObservableSource, in a
* sorted order. Each item emitted by the ObservableSource must implement {@link Comparable} with respect to all
* other items in the sequence.
*
* <p>If any item emitted by this Observable does not implement {@link Comparable} with respect to
* all other items emitted by this Observable, no items will be emitted and the
* sequence is terminated with a {@link ClassCastException}.
* <p>
* <img width="640" height="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/toSortedList.2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code toSortedList} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param capacityHint
* the initial capacity of the ArrayList used to accumulate items before sorting
* @return a Single that emits a list that contains the items emitted by the source ObservableSource in
* sorted order
* @see <a href="http://reactivex.io/documentation/operators/to.html">ReactiveX operators documentation: To</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Single<List<T>> toSortedList(int capacityHint) {
return toSortedList(Functions.<T>naturalOrder(), capacityHint);
}
/**
* Modifies the source ObservableSource so that subscribers will dispose it on a specified
* {@link Scheduler}.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param scheduler
* the {@link Scheduler} to perform the call to dispose() of the upstream Disposable
* @return the source ObservableSource modified so that its dispose() calls happen on the specified
* {@link Scheduler}
* @see <a href="http://reactivex.io/documentation/operators/subscribeon.html">ReactiveX operators documentation: SubscribeOn</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<T> unsubscribeOn(Scheduler scheduler) {
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
return RxJavaPlugins.onAssembly(new ObservableUnsubscribeOn<T>(this, scheduler));
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each containing {@code count} items. When the source
* ObservableSource completes or encounters an error, the resulting ObservableSource emits the current window and
* propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="400" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window3.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum size of each window before it should be emitted
* @return an Observable that emits connected, non-overlapping windows, each containing at most
* {@code count} items from the source ObservableSource
* @throws IllegalArgumentException if either count is non-positive
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Observable<T>> window(long count) {
return window(count, count, bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits windows every {@code skip} items, each containing no more than {@code count} items. When
* the source ObservableSource completes or encounters an error, the resulting ObservableSource emits the current window
* and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="365" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window4.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum size of each window before it should be emitted
* @param skip
* how many items need to be skipped before starting a new window. Note that if {@code skip} and
* {@code count} are equal this is the same operation as {@link #window(long)}.
* @return an Observable that emits windows every {@code skip} items containing at most {@code count} items
* from the source ObservableSource
* @throws IllegalArgumentException if either count or skip is non-positive
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Observable<T>> window(long count, long skip) {
return window(count, skip, bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits windows every {@code skip} items, each containing no more than {@code count} items. When
* the source ObservableSource completes or encounters an error, the resulting ObservableSource emits the current window
* and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="365" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window4.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param count
* the maximum size of each window before it should be emitted
* @param skip
* how many items need to be skipped before starting a new window. Note that if {@code skip} and
* {@code count} are equal this is the same operation as {@link #window(long)}.
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @return an Observable that emits windows every {@code skip} items containing at most {@code count} items
* from the source ObservableSource
* @throws IllegalArgumentException if either count or skip is non-positive
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final Observable<Observable<T>> window(long count, long skip, int bufferSize) {
ObjectHelper.verifyPositive(count, "count");
ObjectHelper.verifyPositive(skip, "skip");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableWindow<T>(this, count, skip, bufferSize));
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource starts a new window periodically, as determined by the {@code timeskip} argument. It emits
* each window after a fixed timespan, specified by the {@code timespan} argument. When the source
* ObservableSource completes or ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="335" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window7.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted
* @param timeskip
* the period of time after which a new window will be created
* @param unit
* the unit of time that applies to the {@code timespan} and {@code timeskip} arguments
* @return an Observable that emits new windows periodically as a fixed timespan elapses
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<Observable<T>> window(long timespan, long timeskip, TimeUnit unit) {
return window(timespan, timeskip, unit, Schedulers.computation(), bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource starts a new window periodically, as determined by the {@code timeskip} argument. It emits
* each window after a fixed timespan, specified by the {@code timespan} argument. When the source
* ObservableSource completes or ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="335" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window7.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted
* @param timeskip
* the period of time after which a new window will be created
* @param unit
* the unit of time that applies to the {@code timespan} and {@code timeskip} arguments
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a window
* @return an Observable that emits new windows periodically as a fixed timespan elapses
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<Observable<T>> window(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler) {
return window(timespan, timeskip, unit, scheduler, bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource starts a new window periodically, as determined by the {@code timeskip} argument. It emits
* each window after a fixed timespan, specified by the {@code timespan} argument. When the source
* ObservableSource completes or ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="335" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window7.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted
* @param timeskip
* the period of time after which a new window will be created
* @param unit
* the unit of time that applies to the {@code timespan} and {@code timeskip} arguments
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a window
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @return an Observable that emits new windows periodically as a fixed timespan elapses
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<Observable<T>> window(long timespan, long timeskip, TimeUnit unit, Scheduler scheduler, int bufferSize) {
ObjectHelper.verifyPositive(timespan, "timespan");
ObjectHelper.verifyPositive(timeskip, "timeskip");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.requireNonNull(unit, "unit is null");
return RxJavaPlugins.onAssembly(new ObservableWindowTimed<T>(this, timespan, timeskip, unit, scheduler, Long.MAX_VALUE, bufferSize, false));
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration specified by the
* {@code timespan} argument. When the source ObservableSource completes or encounters an error, the resulting
* ObservableSource emits the current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="375" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window5.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time that applies to the {@code timespan} argument
* @return an Observable that emits connected, non-overlapping windows representing items emitted by the
* source ObservableSource during fixed, consecutive durations
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<Observable<T>> window(long timespan, TimeUnit unit) {
return window(timespan, unit, Schedulers.computation(), Long.MAX_VALUE, false);
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration as specified by the
* {@code timespan} argument or a maximum size as specified by the {@code count} argument (whichever is
* reached first). When the source ObservableSource completes or encounters an error, the resulting ObservableSource
* emits the current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window6.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time that applies to the {@code timespan} argument
* @param count
* the maximum size of each window before it should be emitted
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* that were emitted during a fixed duration of time or when the window has reached maximum capacity
* (whichever occurs first)
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<Observable<T>> window(long timespan, TimeUnit unit,
long count) {
return window(timespan, unit, Schedulers.computation(), count, false);
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration as specified by the
* {@code timespan} argument or a maximum size as specified by the {@code count} argument (whichever is
* reached first). When the source ObservableSource completes or encounters an error, the resulting ObservableSource
* emits the current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window6.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} operates by default on the {@code computation} {@link Scheduler}.</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time that applies to the {@code timespan} argument
* @param count
* the maximum size of each window before it should be emitted
* @param restart
* if true, when a window reaches the capacity limit, the timer is restarted as well
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* that were emitted during a fixed duration of time or when the window has reached maximum capacity
* (whichever occurs first)
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.COMPUTATION)
public final Observable<Observable<T>> window(long timespan, TimeUnit unit,
long count, boolean restart) {
return window(timespan, unit, Schedulers.computation(), count, restart);
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration as specified by the
* {@code timespan} argument. When the source ObservableSource completes or encounters an error, the resulting
* ObservableSource emits the current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="375" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window5.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a window
* @return an Observable that emits connected, non-overlapping windows containing items emitted by the
* source ObservableSource within a fixed duration
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<Observable<T>> window(long timespan, TimeUnit unit,
Scheduler scheduler) {
return window(timespan, unit, scheduler, Long.MAX_VALUE, false);
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration specified by the
* {@code timespan} argument or a maximum size specified by the {@code count} argument (whichever is reached
* first). When the source ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window6.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param count
* the maximum size of each window before it should be emitted
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a window
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* that were emitted during a fixed duration of time or when the window has reached maximum capacity
* (whichever occurs first)
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<Observable<T>> window(long timespan, TimeUnit unit,
Scheduler scheduler, long count) {
return window(timespan, unit, scheduler, count, false);
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration specified by the
* {@code timespan} argument or a maximum size specified by the {@code count} argument (whichever is reached
* first). When the source ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window6.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param count
* the maximum size of each window before it should be emitted
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a window
* @param restart
* if true, when a window reaches the capacity limit, the timer is restarted as well
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* that were emitted during a fixed duration of time or when the window has reached maximum capacity
* (whichever occurs first)
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<Observable<T>> window(long timespan, TimeUnit unit,
Scheduler scheduler, long count, boolean restart) {
return window(timespan, unit, scheduler, count, restart, bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows, each of a fixed duration specified by the
* {@code timespan} argument or a maximum size specified by the {@code count} argument (whichever is reached
* first). When the source ObservableSource completes or encounters an error, the resulting ObservableSource emits the
* current window and propagates the notification from the source ObservableSource.
* <p>
* <img width="640" height="370" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window6.s.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>You specify which {@link Scheduler} this operator will use</dd>
* </dl>
*
* @param timespan
* the period of time each window collects items before it should be emitted and replaced with a
* new window
* @param unit
* the unit of time which applies to the {@code timespan} argument
* @param count
* the maximum size of each window before it should be emitted
* @param scheduler
* the {@link Scheduler} to use when determining the end and start of a window
* @param restart
* if true, when a window reaches the capacity limit, the timer is restarted as well
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* that were emitted during a fixed duration of time or when the window has reached maximum capacity
* (whichever occurs first)
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.CUSTOM)
public final Observable<Observable<T>> window(
long timespan, TimeUnit unit, Scheduler scheduler,
long count, boolean restart, int bufferSize) {
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
ObjectHelper.requireNonNull(scheduler, "scheduler is null");
ObjectHelper.requireNonNull(unit, "unit is null");
ObjectHelper.verifyPositive(count, "count");
return RxJavaPlugins.onAssembly(new ObservableWindowTimed<T>(this, timespan, timespan, unit, scheduler, count, bufferSize, restart));
}
/**
* Returns an Observable that emits non-overlapping windows of items it collects from the source ObservableSource
* where the boundary of each window is determined by the items emitted from a specified boundary-governing
* ObservableSource.
* <p>
* <img width="640" height="475" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window8.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B>
* the window element type (ignored)
* @param boundary
* an ObservableSource whose emitted items close and open windows
* @return an Observable that emits non-overlapping windows of items it collects from the source ObservableSource
* where the boundary of each window is determined by the items emitted from the {@code boundary}
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<Observable<T>> window(ObservableSource<B> boundary) {
return window(boundary, bufferSize());
}
/**
* Returns an Observable that emits non-overlapping windows of items it collects from the source ObservableSource
* where the boundary of each window is determined by the items emitted from a specified boundary-governing
* ObservableSource.
* <p>
* <img width="640" height="475" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window8.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B>
* the window element type (ignored)
* @param boundary
* an ObservableSource whose emitted items close and open windows
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @return an Observable that emits non-overlapping windows of items it collects from the source ObservableSource
* where the boundary of each window is determined by the items emitted from the {@code boundary}
* ObservableSource
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<Observable<T>> window(ObservableSource<B> boundary, int bufferSize) {
ObjectHelper.requireNonNull(boundary, "boundary is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableWindowBoundary<T, B>(this, boundary, bufferSize));
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits windows that contain those items emitted by the source ObservableSource between the time when
* the {@code openingIndicator} ObservableSource emits an item and when the ObservableSource returned by
* {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="550" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the element type of the window-opening ObservableSource
* @param <V> the element type of the window-closing ObservableSources
* @param openingIndicator
* an ObservableSource that, when it emits an item, causes another window to be created
* @param closingIndicator
* a {@link Function} that produces an ObservableSource for every window created. When this ObservableSource
* emits an item, the associated window is closed and emitted
* @return an Observable that emits windows of items emitted by the source ObservableSource that are governed by
* the specified window-governing ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, V> Observable<Observable<T>> window(
ObservableSource<U> openingIndicator,
Function<? super U, ? extends ObservableSource<V>> closingIndicator) {
return window(openingIndicator, closingIndicator, bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits windows that contain those items emitted by the source ObservableSource between the time when
* the {@code openingIndicator} ObservableSource emits an item and when the ObservableSource returned by
* {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="550" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window2.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the element type of the window-opening ObservableSource
* @param <V> the element type of the window-closing ObservableSources
* @param openingIndicator
* an ObservableSource that, when it emits an item, causes another window to be created
* @param closingIndicator
* a {@link Function} that produces an ObservableSource for every window created. When this ObservableSource
* emits an item, the associated window is closed and emitted
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @return an Observable that emits windows of items emitted by the source ObservableSource that are governed by
* the specified window-governing ObservableSources
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, V> Observable<Observable<T>> window(
ObservableSource<U> openingIndicator,
Function<? super U, ? extends ObservableSource<V>> closingIndicator, int bufferSize) {
ObjectHelper.requireNonNull(openingIndicator, "openingIndicator is null");
ObjectHelper.requireNonNull(closingIndicator, "closingIndicator is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableWindowBoundarySelector<T, U, V>(this, openingIndicator, closingIndicator, bufferSize));
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows. It emits the current window and opens a new one
* whenever the ObservableSource produced by the specified {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="455" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window1.png" alt="">
* <dl>
* if left unconsumed.</dd>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B> the element type of the boundary ObservableSource
* @param boundary
* a {@link Callable} that returns an {@code ObservableSource} that governs the boundary between windows.
* When the source {@code ObservableSource} emits an item, {@code window} emits the current window and begins
* a new one.
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* whenever {@code closingIndicator} emits an item
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<Observable<T>> window(Callable<? extends ObservableSource<B>> boundary) {
return window(boundary, bufferSize());
}
/**
* Returns an Observable that emits windows of items it collects from the source ObservableSource. The resulting
* ObservableSource emits connected, non-overlapping windows. It emits the current window and opens a new one
* whenever the ObservableSource produced by the specified {@code closingIndicator} emits an item.
* <p>
* <img width="640" height="455" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/window1.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This version of {@code window} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <B> the element type of the boundary ObservableSource
* @param boundary
* a {@link Callable} that returns an {@code ObservableSource} that governs the boundary between windows.
* When the source {@code ObservableSource} emits an item, {@code window} emits the current window and begins
* a new one.
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @return an Observable that emits connected, non-overlapping windows of items from the source ObservableSource
* whenever {@code closingIndicator} emits an item
* @see <a href="http://reactivex.io/documentation/operators/window.html">ReactiveX operators documentation: Window</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <B> Observable<Observable<T>> window(Callable<? extends ObservableSource<B>> boundary, int bufferSize) {
ObjectHelper.requireNonNull(boundary, "boundary is null");
ObjectHelper.verifyPositive(bufferSize, "bufferSize");
return RxJavaPlugins.onAssembly(new ObservableWindowBoundarySupplier<T, B>(this, boundary, bufferSize));
}
/**
* Merges the specified ObservableSource into this ObservableSource sequence by using the {@code resultSelector}
* function only when the source ObservableSource (this instance) emits an item.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/withLatestFrom.png" alt="">
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator, by default, doesn't run any particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U> the element type of the other ObservableSource
* @param <R> the result type of the combination
* @param other
* the other ObservableSource
* @param combiner
* the function to call when this ObservableSource emits an item and the other ObservableSource has already
* emitted an item, to generate the item to be emitted by the resulting ObservableSource
* @return an Observable that merges the specified ObservableSource into this ObservableSource by using the
* {@code resultSelector} function only when the source ObservableSource sequence (this instance) emits an
* item
* @since 2.0
* @see <a href="http://reactivex.io/documentation/operators/combinelatest.html">ReactiveX operators documentation: CombineLatest</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> withLatestFrom(ObservableSource<? extends U> other, BiFunction<? super T, ? super U, ? extends R> combiner) {
ObjectHelper.requireNonNull(other, "other is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
return RxJavaPlugins.onAssembly(new ObservableWithLatestFrom<T, U, R>(this, combiner, other));
}
/**
* Combines the value emission from this ObservableSource with the latest emissions from the
* other ObservableSources via a function to produce the output item.
*
* <p>Note that this operator doesn't emit anything until all other sources have produced at
* least one value. The resulting emission only happens when this ObservableSource emits (and
* not when any of the other sources emit, unlike combineLatest).
* If a source doesn't produce any value and just completes, the sequence is completed immediately.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/withLatestFrom.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the first other source's value type
* @param <T2> the second other source's value type
* @param <R> the result value type
* @param o1 the first other ObservableSource
* @param o2 the second other ObservableSource
* @param combiner the function called with an array of values from each participating ObservableSource
* @return the new ObservableSource instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <T1, T2, R> Observable<R> withLatestFrom(
ObservableSource<T1> o1, ObservableSource<T2> o2,
Function3<? super T, ? super T1, ? super T2, R> combiner) {
ObjectHelper.requireNonNull(o1, "o1 is null");
ObjectHelper.requireNonNull(o2, "o2 is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
Function<Object[], R> f = Functions.toFunction(combiner);
return withLatestFrom(new ObservableSource[] { o1, o2 }, f);
}
/**
* Combines the value emission from this ObservableSource with the latest emissions from the
* other ObservableSources via a function to produce the output item.
*
* <p>Note that this operator doesn't emit anything until all other sources have produced at
* least one value. The resulting emission only happens when this ObservableSource emits (and
* not when any of the other sources emit, unlike combineLatest).
* If a source doesn't produce any value and just completes, the sequence is completed immediately.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/withLatestFrom.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the first other source's value type
* @param <T2> the second other source's value type
* @param <T3> the third other source's value type
* @param <R> the result value type
* @param o1 the first other ObservableSource
* @param o2 the second other ObservableSource
* @param o3 the third other ObservableSource
* @param combiner the function called with an array of values from each participating ObservableSource
* @return the new ObservableSource instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <T1, T2, T3, R> Observable<R> withLatestFrom(
ObservableSource<T1> o1, ObservableSource<T2> o2,
ObservableSource<T3> o3,
Function4<? super T, ? super T1, ? super T2, ? super T3, R> combiner) {
ObjectHelper.requireNonNull(o1, "o1 is null");
ObjectHelper.requireNonNull(o2, "o2 is null");
ObjectHelper.requireNonNull(o3, "o3 is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
Function<Object[], R> f = Functions.toFunction(combiner);
return withLatestFrom(new ObservableSource[] { o1, o2, o3 }, f);
}
/**
* Combines the value emission from this ObservableSource with the latest emissions from the
* other ObservableSources via a function to produce the output item.
*
* <p>Note that this operator doesn't emit anything until all other sources have produced at
* least one value. The resulting emission only happens when this ObservableSource emits (and
* not when any of the other sources emit, unlike combineLatest).
* If a source doesn't produce any value and just completes, the sequence is completed immediately.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/withLatestFrom.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <T1> the first other source's value type
* @param <T2> the second other source's value type
* @param <T3> the third other source's value type
* @param <T4> the fourth other source's value type
* @param <R> the result value type
* @param o1 the first other ObservableSource
* @param o2 the second other ObservableSource
* @param o3 the third other ObservableSource
* @param o4 the fourth other ObservableSource
* @param combiner the function called with an array of values from each participating ObservableSource
* @return the new ObservableSource instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <T1, T2, T3, T4, R> Observable<R> withLatestFrom(
ObservableSource<T1> o1, ObservableSource<T2> o2,
ObservableSource<T3> o3, ObservableSource<T4> o4,
Function5<? super T, ? super T1, ? super T2, ? super T3, ? super T4, R> combiner) {
ObjectHelper.requireNonNull(o1, "o1 is null");
ObjectHelper.requireNonNull(o2, "o2 is null");
ObjectHelper.requireNonNull(o3, "o3 is null");
ObjectHelper.requireNonNull(o4, "o4 is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
Function<Object[], R> f = Functions.toFunction(combiner);
return withLatestFrom(new ObservableSource[] { o1, o2, o3, o4 }, f);
}
/**
* Combines the value emission from this ObservableSource with the latest emissions from the
* other ObservableSources via a function to produce the output item.
*
* <p>Note that this operator doesn't emit anything until all other sources have produced at
* least one value. The resulting emission only happens when this ObservableSource emits (and
* not when any of the other sources emit, unlike combineLatest).
* If a source doesn't produce any value and just completes, the sequence is completed immediately.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/withLatestFrom.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the result value type
* @param others the array of other sources
* @param combiner the function called with an array of values from each participating ObservableSource
* @return the new ObservableSource instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> withLatestFrom(ObservableSource<?>[] others, Function<? super Object[], R> combiner) {
ObjectHelper.requireNonNull(others, "others is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
return RxJavaPlugins.onAssembly(new ObservableWithLatestFromMany<T, R>(this, others, combiner));
}
/**
* Combines the value emission from this ObservableSource with the latest emissions from the
* other ObservableSources via a function to produce the output item.
*
* <p>Note that this operator doesn't emit anything until all other sources have produced at
* least one value. The resulting emission only happens when this ObservableSource emits (and
* not when any of the other sources emit, unlike combineLatest).
* If a source doesn't produce any value and just completes, the sequence is completed immediately.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/withLatestFrom.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>This operator does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <R> the result value type
* @param others the iterable of other sources
* @param combiner the function called with an array of values from each participating ObservableSource
* @return the new ObservableSource instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <R> Observable<R> withLatestFrom(Iterable<? extends ObservableSource<?>> others, Function<? super Object[], R> combiner) {
ObjectHelper.requireNonNull(others, "others is null");
ObjectHelper.requireNonNull(combiner, "combiner is null");
return RxJavaPlugins.onAssembly(new ObservableWithLatestFromMany<T, R>(this, others, combiner));
}
/**
* Returns an Observable that emits items that are the result of applying a specified function to pairs of
* values, one each from the source ObservableSource and a specified Iterable sequence.
* <p>
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.i.png" alt="">
* <p>
* Note that the {@code other} Iterable is evaluated as items are observed from the source ObservableSource; it is
* not pre-consumed. This allows you to zip infinite streams on either side.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zipWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items in the {@code other} Iterable
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param other
* the Iterable sequence
* @param zipper
* a function that combines the pairs of items from the ObservableSource and the Iterable to generate
* the items to be emitted by the resulting ObservableSource
* @return an Observable that pairs up values from the source ObservableSource and the {@code other} Iterable
* sequence and emits the results of {@code zipFunction} applied to these pairs
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> zipWith(Iterable<U> other, BiFunction<? super T, ? super U, ? extends R> zipper) {
ObjectHelper.requireNonNull(other, "other is null");
ObjectHelper.requireNonNull(zipper, "zipper is null");
return RxJavaPlugins.onAssembly(new ObservableZipIterable<T, U, R>(this, other, zipper));
}
/**
* Returns an Observable that emits items that are the result of applying a specified function to pairs of
* values, one each from the source ObservableSource and another specified ObservableSource.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>range(1, 5).doOnComplete(action1).zipWith(range(6, 5).doOnComplete(action2), (a, b) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
*
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zipWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the {@code other} ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param other
* the other ObservableSource
* @param zipper
* a function that combines the pairs of items from the two ObservableSources to generate the items to
* be emitted by the resulting ObservableSource
* @return an Observable that pairs up values from the source ObservableSource and the {@code other} ObservableSource
* and emits the results of {@code zipFunction} applied to these pairs
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> zipWith(ObservableSource<? extends U> other,
BiFunction<? super T, ? super U, ? extends R> zipper) {
ObjectHelper.requireNonNull(other, "other is null");
return zip(this, other, zipper);
}
/**
* Returns an Observable that emits items that are the result of applying a specified function to pairs of
* values, one each from the source ObservableSource and another specified ObservableSource.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>range(1, 5).doOnComplete(action1).zipWith(range(6, 5).doOnComplete(action2), (a, b) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
*
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zipWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the {@code other} ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param other
* the other ObservableSource
* @param zipper
* a function that combines the pairs of items from the two ObservableSources to generate the items to
* be emitted by the resulting ObservableSource
* @param delayError
* if true, errors from the current Observable or the other ObservableSource is delayed until both terminate
* @return an Observable that pairs up values from the source ObservableSource and the {@code other} ObservableSource
* and emits the results of {@code zipFunction} applied to these pairs
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> zipWith(ObservableSource<? extends U> other,
BiFunction<? super T, ? super U, ? extends R> zipper, boolean delayError) {
return zip(this, other, zipper, delayError);
}
/**
* Returns an Observable that emits items that are the result of applying a specified function to pairs of
* values, one each from the source ObservableSource and another specified ObservableSource.
* <p>
* The operator subscribes to its sources in order they are specified and completes eagerly if
* one of the sources is shorter than the rest while disposing the other sources. Therefore, it
* is possible those other sources will never be able to run to completion (and thus not calling
* {@code doOnComplete()}). This can also happen if the sources are exactly the same length; if
* source A completes and B has been consumed and is about to complete, the operator detects A won't
* be sending further values and it will dispose B immediately. For example:
* <pre><code>range(1, 5).doOnComplete(action1).zipWith(range(6, 5).doOnComplete(action2), (a, b) -> a + b)</code></pre>
* {@code action1} will be called but {@code action2} won't.
* <br>To work around this termination property,
* use {@link #doOnDispose(Action)} as well or use {@code using()} to do cleanup in case of completion
* or a dispose() call.
*
* <img width="640" height="380" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/zip.png" alt="">
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code zipWith} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
*
* @param <U>
* the type of items emitted by the {@code other} ObservableSource
* @param <R>
* the type of items emitted by the resulting ObservableSource
* @param other
* the other ObservableSource
* @param zipper
* a function that combines the pairs of items from the two ObservableSources to generate the items to
* be emitted by the resulting ObservableSource
* @param bufferSize
* the capacity hint for the buffer in the inner windows
* @param delayError
* if true, errors from the current Observable or the other ObservableSource is delayed until both terminate
* @return an Observable that pairs up values from the source ObservableSource and the {@code other} ObservableSource
* and emits the results of {@code zipFunction} applied to these pairs
* @see <a href="http://reactivex.io/documentation/operators/zip.html">ReactiveX operators documentation: Zip</a>
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final <U, R> Observable<R> zipWith(ObservableSource<? extends U> other,
BiFunction<? super T, ? super U, ? extends R> zipper, boolean delayError, int bufferSize) {
return zip(this, other, zipper, delayError, bufferSize);
}
// -------------------------------------------------------------------------
// Fluent test support, super handy and reduces test preparation boilerplate
// -------------------------------------------------------------------------
/**
* Creates a TestObserver and subscribes
* it to this Observable.
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code test} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @return the new TestObserver instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final TestObserver<T> test() { // NoPMD
TestObserver<T> ts = new TestObserver<T>();
subscribe(ts);
return ts;
}
/**
* Creates a TestObserver, optionally disposes it and then subscribes
* it to this Observable.
*
* <dl>
* <dt><b>Scheduler:</b></dt>
* <dd>{@code test} does not operate by default on a particular {@link Scheduler}.</dd>
* </dl>
* @param dispose dispose the TestObserver before it is subscribed to this Observable?
* @return the new TestObserver instance
* @since 2.0
*/
@CheckReturnValue
@SchedulerSupport(SchedulerSupport.NONE)
public final TestObserver<T> test(boolean dispose) { // NoPMD
TestObserver<T> ts = new TestObserver<T>();
if (dispose) {
ts.dispose();
}
subscribe(ts);
return ts;
}
}
搞个网络请求图片并显示的例子吧。
public void test(View v) {
Observable.create(new ObservableOnSubscribe<Bitmap>() {
@Override
public void subscribe(@NonNull ObservableEmitter<Bitmap> subscriber) throws Exception {
Request request = new Request.Builder().url("https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1182689490,2680987461&fm=26&gp=0.jpg").build();
Response response = OkhttpUtils.excute(request);
byte[] bytes = response.body().bytes();
Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
subscriber.onNext(bmp);
}
})
.subscribeOn(Schedulers.io()) //切换到IO线程访问网络获取图像
.observeOn(AndroidSchedulers.mainThread()) //切换到UI线程加载图像
.subscribe(new Observer<Bitmap>() {
@Override
public void onSubscribe(@NonNull Disposable d) {
Log.d(TAG, "test,onSubscribe");
}
@Override
public void onNext(@NonNull Bitmap bitmap) {
Log.d(TAG, "test,onNext");
img.setImageBitmap(bitmap);
}
@Override
public void onError(@NonNull Throwable e) {
Log.d(TAG, "test,onError"+e.getMessage());
e.printStackTrace();
}
@Override
public void onComplete() {
Log.d(TAG, "test,onComplete");
}
});
}
参数变换
除了线程切换,RxJava(或者说RxAndroid)另一个特色是变换功能Map,比如上面例子中我输入的本来是个String url,但是实际想利用的是url所对应的Bitmap,那我就可以利用map函数将String参数转为Bitmap参数,如下:
Observable.just("https://ss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=1182689490,2680987461&fm=26&gp=0.jpg")
.map(new Function<String, Bitmap>() {
@Override
public Bitmap apply(@NonNull String url) throws Exception {
Request request = new Request.Builder().url(url).build();
Response response = OkhttpUtils.excute(request);
byte[] bytes = response.body().bytes();
Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
return bmp;
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Bitmap>() {
@Override
public void onSubscribe(@NonNull Disposable d) {
Log.d(TAG, "test,onSubscribe");
}
@Override
public void onNext(@NonNull Bitmap bitmap) {
Log.d(TAG, "test,onNext");
img.setImageBitmap(bitmap);
}
@Override
public void onError(@NonNull Throwable e) {
Log.d(TAG, "test,onError" + e.getMessage());
e.printStackTrace();
}
@Override
public void onComplete() {
Log.d(TAG, "test,onComplete");
}
});
}