/**
 * 便于控制与查看的日志输出
 */
public class L {
    private static final int VERBOSE = 1;
    private static final int DEBUG = 2;
    private static final int INFO = 3;
    private static final int WARN = 4;
    private static final int ERROR = 5;
    private static final int NOTHING = 6;

    private static final int LEVEL = VERBOSE;

    public static void v(String msg) {
        if (LEVEL <= VERBOSE) {
            StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
            Log.v(getDefaultTag(stackTraceElement), msg + getAdditionalInfo(stackTraceElement));
        }
    }

    public static void d(String msg) {
        if (LEVEL <= DEBUG) {
            StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
            Log.d(getDefaultTag(stackTraceElement), msg + getAdditionalInfo(stackTraceElement));
        }
    }

    public static void i(String msg) {
        if (LEVEL <= INFO) {
            StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
            Log.i(getDefaultTag(stackTraceElement), msg + getAdditionalInfo(stackTraceElement));
        }
    }

    public static void w(String msg) {
        if (LEVEL <= WARN) {
            StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
            Log.w(getDefaultTag(stackTraceElement), msg + getAdditionalInfo(stackTraceElement));

        }
    }

    public static void e(String msg) {
        if (LEVEL <= ERROR) {
            StackTraceElement stackTraceElement = Thread.currentThread().getStackTrace()[3];
            Log.e(getDefaultTag(stackTraceElement), msg + getAdditionalInfo(stackTraceElement));
        }
    }

    private static String getDefaultTag(StackTraceElement stackTraceElement) {
        String fileName = stackTraceElement.getFileName();
        String stringArray[] = fileName.split("\\.");
        return stringArray[0];
    }

    public static String getAdditionalInfo(StackTraceElement stackTraceElement) {

        StringBuilder stringBuilder = new StringBuilder();
        /* 获取线程名 */
        String threadName = Thread.currentThread().getName();
        /* 获取类名 */
        String className = stackTraceElement.getClassName();
        /* 获取方法名 */
        String methodName = stackTraceElement.getMethodName();
        /* 获取打印Log的行数 */
        int lineNumber = stackTraceElement.getLineNumber();

        return stringBuilder
                .append(" --- 线程: ")
                .append(threadName)
                .append("; 类: ")
                .append(className)
                .append("; 方法: ")
                .append(methodName)
                .append("(); 行号: ")
                .append(lineNumber).toString();
    }
}