content: /*
   * Copyright (C) 2017 The Android Open Source Project
   *
   * 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 com.google.android.exoplayer2.util;
  
  import android.os.Handler;
  import android.os.Looper;
  import androidx.annotation.Nullable;
  
  /**
   * An interface to call through to a {@link Handler}. Instances must be created by calling {@link
   * Clock#createHandler(Looper, Handler.Callback)} on {@link Clock#DEFAULT} for all non-test cases.
   */
  public interface HandlerWrapper {
  
    /** A message obtained from the handler. */
    interface Message {
  
      /** See {@link android.os.Message#sendToTarget()}. */
      void sendToTarget();
  
      /** See {@link android.os.Message#getTarget()}. */
      HandlerWrapper getTarget();
    }
  
    /** See {@link Handler#getLooper()}. */
    Looper getLooper();
  
    /** See {@link Handler#hasMessages(int)}. */
    boolean hasMessages(int what);
  
    /** See {@link Handler#obtainMessage(int)}. */
    Message obtainMessage(int what);
  
    /** See {@link Handler#obtainMessage(int, Object)}. */
    Message obtainMessage(int what, @Nullable Object obj);
  
    /** See {@link Handler#obtainMessage(int, int, int)}. */
    Message obtainMessage(int what, int arg1, int arg2);
  
    /** See {@link Handler#obtainMessage(int, int, int, Object)}. */
    Message obtainMessage(int what, int arg1, int arg2, @Nullable Object obj);
  
    /** See {@link Handler#sendMessageAtFrontOfQueue(android.os.Message)}. */
    boolean sendMessageAtFrontOfQueue(Message message);
  
    /** See {@link Handler#sendEmptyMessage(int)}. */
    boolean sendEmptyMessage(int what);
  
    /** See {@link Handler#sendEmptyMessageDelayed(int, long)}. */
    boolean sendEmptyMessageDelayed(int what, int delayMs);
  
    /** See {@link Handler#sendEmptyMessageAtTime(int, long)}. */
    boolean sendEmptyMessageAtTime(int what, long uptimeMs);
  
    /** See {@link Handler#removeMessages(int)}. */
    void removeMessages(int what);
  
    /** See {@link Handler#removeCallbacksAndMessages(Object)}. */
    void removeCallbacksAndMessages(@Nullable Object token);
  
    /** See {@link Handler#post(Runnable)}. */
    boolean post(Runnable runnable);
  
    /** See {@link Handler#postDelayed(Runnable, long)}. */
    boolean postDelayed(Runnable runnable, long delayMs);
  
    /** See {@link android.os.Handler#postAtFrontOfQueue(Runnable)}. */
    boolean postAtFrontOfQueue(Runnable runnable);
  }
  