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/*
* Copyright (C) 2012 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.gallery3d.app;
import com.android.gallery3d.data.MediaObject;
import com.android.gallery3d.data.MediaObject.PanoramaSupportCallback;
import com.android.gallery3d.data.PanoramaMetadataJob;
import com.android.gallery3d.util.Future;
import com.android.gallery3d.util.FutureListener;
import com.android.gallery3d.util.LightCycleHelper;
import com.android.gallery3d.util.LightCycleHelper.PanoramaMetadata;
import java.util.ArrayList;
/**
* This class breaks out the off-thread panorama support checks so that the
* complexity can be shared between UriImage and LocalImage, which need to
* support panoramas.
*/
public class PanoramaMetadataSupport implements FutureListener<PanoramaMetadata> {
private Object mLock = new Object();
private Future<PanoramaMetadata> mGetPanoMetadataTask;
private PanoramaMetadata mPanoramaMetadata;
private ArrayList<PanoramaSupportCallback> mCallbacksWaiting;
private MediaObject mMediaObject;
public PanoramaMetadataSupport(MediaObject mediaObject) {
mMediaObject = mediaObject;
}
public void getPanoramaSupport(GalleryApp app, PanoramaSupportCallback callback) {
synchronized (mLock) {
if (mPanoramaMetadata != null) {
callback.panoramaInfoAvailable(mMediaObject, mPanoramaMetadata.mUsePanoramaViewer,
mPanoramaMetadata.mIsPanorama360);
} else {
if (mCallbacksWaiting == null) {
mCallbacksWaiting = new ArrayList<PanoramaSupportCallback>();
mGetPanoMetadataTask = app.getThreadPool().submit(
new PanoramaMetadataJob(app.getAndroidContext(),
mMediaObject.getContentUri()), this);
}
mCallbacksWaiting.add(callback);
}
}
}
public void clearCachedValues() {
synchronized (mLock) {
if (mPanoramaMetadata != null) {
mPanoramaMetadata = null;
} else if (mGetPanoMetadataTask != null) {
mGetPanoMetadataTask.cancel();
for (PanoramaSupportCallback cb : mCallbacksWaiting) {
cb.panoramaInfoAvailable(mMediaObject, false, false);
}
mGetPanoMetadataTask = null;
mCallbacksWaiting = null;
}
}
}
@Override
public void onFutureDone(Future<PanoramaMetadata> future) {
synchronized (mLock) {
mPanoramaMetadata = future.get();
if (mPanoramaMetadata == null) {
// Error getting panorama data from file. Treat as not panorama.
mPanoramaMetadata = LightCycleHelper.NOT_PANORAMA;
}
for (PanoramaSupportCallback cb : mCallbacksWaiting) {
cb.panoramaInfoAvailable(mMediaObject, mPanoramaMetadata.mUsePanoramaViewer,
mPanoramaMetadata.mIsPanorama360);
}
mGetPanoMetadataTask = null;
mCallbacksWaiting = null;
}
}
}
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