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/*
* Copyright (C) 2015 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.android.messaging.datamodel.media;
import com.android.messaging.datamodel.binding.BindableOnceData;
import com.android.messaging.datamodel.media.MediaResourceManager.MediaResourceLoadListener;
/**
* The {@link MediaRequest} interface is threading-model-blind, allowing the implementations to
* be processed synchronously or asynchronously.
* This is a {@link MediaRequest} implementation that includes functionalities such as binding and
* event callbacks for multi-threaded media request processing.
*/
public abstract class BindableMediaRequest<T extends RefCountedMediaResource>
extends BindableOnceData
implements MediaRequest<T>, MediaResourceLoadListener<T> {
private MediaResourceLoadListener<T> mListener;
public BindableMediaRequest(final MediaResourceLoadListener<T> listener) {
mListener = listener;
}
/**
* Delegates the media resource callback to the listener. Performs binding check to ensure
* the listener is still bound to this request.
*/
@Override
public void onMediaResourceLoaded(final MediaRequest<T> request, final T resource,
final boolean cached) {
if (isBound() && mListener != null) {
mListener.onMediaResourceLoaded(request, resource, cached);
}
}
/**
* Delegates the media resource callback to the listener. Performs binding check to ensure
* the listener is still bound to this request.
*/
@Override
public void onMediaResourceLoadError(final MediaRequest<T> request, final Exception exception) {
if (isBound() && mListener != null) {
mListener.onMediaResourceLoadError(request, exception);
}
}
@Override
protected void unregisterListeners() {
mListener = null;
}
}
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