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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.gallery3d.app;
     17 
     18 import com.android.gallery3d.data.MediaObject;
     19 import com.android.gallery3d.data.MediaObject.PanoramaSupportCallback;
     20 import com.android.gallery3d.data.PanoramaMetadataJob;
     21 import com.android.gallery3d.util.Future;
     22 import com.android.gallery3d.util.FutureListener;
     23 import com.android.gallery3d.util.LightCycleHelper;
     24 import com.android.gallery3d.util.LightCycleHelper.PanoramaMetadata;
     25 
     26 import java.util.ArrayList;
     27 
     28 /**
     29  * This class breaks out the off-thread panorama support checks so that the
     30  * complexity can be shared between UriImage and LocalImage, which need to
     31  * support panoramas.
     32  */
     33 public class PanoramaMetadataSupport implements FutureListener<PanoramaMetadata> {
     34     private Object mLock = new Object();
     35     private Future<PanoramaMetadata> mGetPanoMetadataTask;
     36     private PanoramaMetadata mPanoramaMetadata;
     37     private ArrayList<PanoramaSupportCallback> mCallbacksWaiting;
     38     private MediaObject mMediaObject;
     39 
     40     public PanoramaMetadataSupport(MediaObject mediaObject) {
     41         mMediaObject = mediaObject;
     42     }
     43 
     44     public void getPanoramaSupport(GalleryApp app, PanoramaSupportCallback callback) {
     45         synchronized (mLock) {
     46             if (mPanoramaMetadata != null) {
     47                 callback.panoramaInfoAvailable(mMediaObject, mPanoramaMetadata.mUsePanoramaViewer,
     48                         mPanoramaMetadata.mIsPanorama360);
     49             } else {
     50                 if (mCallbacksWaiting == null) {
     51                     mCallbacksWaiting = new ArrayList<PanoramaSupportCallback>();
     52                     mGetPanoMetadataTask = app.getThreadPool().submit(
     53                             new PanoramaMetadataJob(app.getAndroidContext(),
     54                                     mMediaObject.getContentUri()), this);
     55 
     56                 }
     57                 mCallbacksWaiting.add(callback);
     58             }
     59         }
     60     }
     61 
     62     public void clearCachedValues() {
     63         synchronized (mLock) {
     64             if (mPanoramaMetadata != null) {
     65                 mPanoramaMetadata = null;
     66             } else if (mGetPanoMetadataTask != null) {
     67                 mGetPanoMetadataTask.cancel();
     68                 for (PanoramaSupportCallback cb : mCallbacksWaiting) {
     69                     cb.panoramaInfoAvailable(mMediaObject, false, false);
     70                 }
     71                 mGetPanoMetadataTask = null;
     72                 mCallbacksWaiting = null;
     73             }
     74         }
     75     }
     76 
     77     @Override
     78     public void onFutureDone(Future<PanoramaMetadata> future) {
     79         synchronized (mLock) {
     80             mPanoramaMetadata = future.get();
     81             if (mPanoramaMetadata == null) {
     82                 // Error getting panorama data from file. Treat as not panorama.
     83                 mPanoramaMetadata = LightCycleHelper.NOT_PANORAMA;
     84             }
     85             for (PanoramaSupportCallback cb : mCallbacksWaiting) {
     86                 cb.panoramaInfoAvailable(mMediaObject, mPanoramaMetadata.mUsePanoramaViewer,
     87                         mPanoramaMetadata.mIsPanorama360);
     88             }
     89             mGetPanoMetadataTask = null;
     90             mCallbacksWaiting = null;
     91         }
     92     }
     93 }
     94