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      1 /*
      2  * Copyright (C) 2009 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 
     17 package com.cooliris.media;
     18 
     19 import java.util.ArrayList;
     20 
     21 import android.util.Log;
     22 
     23 public final class ConcatenatedDataSource implements DataSource {
     24     private static final String TAG = "ConcatenatedDataSource";
     25     private final DataSource mFirst;
     26     private final DataSource mSecond;
     27 
     28     public ConcatenatedDataSource(DataSource first, DataSource second) {
     29         mFirst = first;
     30         mSecond = second;
     31     }
     32 
     33     public void loadMediaSets(final MediaFeed feed) {
     34         mFirst.loadMediaSets(feed);
     35         mSecond.loadMediaSets(feed);
     36     }
     37 
     38     public void loadItemsForSet(final MediaFeed feed, final MediaSet parentSet, int rangeStart, int rangeEnd) {
     39         if (parentSet != null) {
     40             DataSource dataSource = parentSet.mDataSource;
     41             if (dataSource != null) {
     42                 dataSource.loadItemsForSet(feed, parentSet, rangeStart, rangeEnd);
     43             } else {
     44                 Log.e(TAG, "MediaSet was not added to the feed");
     45             }
     46         }
     47     }
     48 
     49     public boolean performOperation(int operation, final ArrayList<MediaBucket> mediaBuckets, Object data) {
     50         ArrayList<MediaBucket> singleBucket = new ArrayList<MediaBucket>(1);
     51         singleBucket.add(null);
     52         int numBuckets = mediaBuckets.size();
     53         boolean retVal = true;
     54         for (int i = 0; i < numBuckets; ++i) { // CR: iterator for
     55             MediaBucket bucket = mediaBuckets.get(i);
     56             MediaSet set = bucket.mediaSet;
     57             if (set != null) {
     58                 DataSource dataSource = set.mDataSource;
     59                 if (dataSource != null) {
     60                     singleBucket.set(0, bucket);
     61                     retVal &= dataSource.performOperation(operation, singleBucket, data);
     62                 } else {
     63                     Log.e(TAG, "MediaSet was not added to the feed");
     64                 }
     65             }
     66         }
     67         return retVal;
     68     }
     69 
     70     public DiskCache getThumbnailCache() {
     71         throw new UnsupportedOperationException("ConcatenatedDataSource should not create MediaItems");
     72     }
     73 
     74     public void shutdown() {
     75         mFirst.shutdown();
     76         mSecond.shutdown();
     77     }
     78 
     79     public void refresh(final MediaFeed feed, final String[] databaseUris) {
     80         mFirst.refresh(feed, databaseUris);
     81         mSecond.refresh(feed, databaseUris);
     82     }
     83 
     84     public String[] getDatabaseUris() {
     85         String[] first = mFirst.getDatabaseUris();
     86         String[] second = mSecond.getDatabaseUris();
     87         // We concatenate
     88         return (String[])ArrayUtils.addAll(first, second);
     89     }
     90 }
     91