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/*
* Copyright 2018 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 android.media;
import android.media.MediaPlayerBase.PlaybackListener;
import android.media.session.PlaybackState;
import android.os.Handler;
import android.os.Message;
import android.support.annotation.NonNull;
import java.util.List;
import java.util.concurrent.Executor;
/**
* Holds {@link PlaybackListener} with the {@link Handler}.
*/
public class PlaybackListenerHolder {
public final Executor executor;
public final PlaybackListener listener;
public PlaybackListenerHolder(Executor executor, @NonNull PlaybackListener listener) {
this.executor = executor;
this.listener = listener;
}
public void postPlaybackChange(final PlaybackState2 state) {
executor.execute(() -> listener.onPlaybackChanged(state));
}
/**
* Returns {@code true} if the given list contains a {@link PlaybackListenerHolder} that holds
* the given listener.
*
* @param list list to check
* @param listener listener to check
* @return {@code true} if the given list contains listener. {@code false} otherwise.
*/
public static <Holder extends PlaybackListenerHolder> boolean contains(
@NonNull List<Holder> list, PlaybackListener listener) {
return indexOf(list, listener) >= 0;
}
/**
* Returns the index of the {@link PlaybackListenerHolder} that contains the given listener.
*
* @param list list to check
* @param listener listener to check
* @return {@code index} of item if the given list contains listener. {@code -1} otherwise.
*/
public static <Holder extends PlaybackListenerHolder> int indexOf(
@NonNull List<Holder> list, PlaybackListener listener) {
for (int i = 0; i < list.size(); i++) {
if (list.get(i).listener == listener) {
return i;
}
}
return -1;
}
}
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