1 /* 2 * Copyright (C) 2011 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.android.gallery3d.data; 18 19 import com.android.gallery3d.util.Future; 20 21 import java.util.ArrayList; 22 23 // ComboAlbum combines multiple media sets into one. It lists all media items 24 // from the input albums. 25 // This only handles SubMediaSets, not MediaItems. (That's all we need now) 26 public class ComboAlbum extends MediaSet implements ContentListener { 27 @SuppressWarnings("unused") 28 private static final String TAG = "ComboAlbum"; 29 private final MediaSet[] mSets; 30 private String mName; 31 ComboAlbum(Path path, MediaSet[] mediaSets, String name)32 public ComboAlbum(Path path, MediaSet[] mediaSets, String name) { 33 super(path, nextVersionNumber()); 34 mSets = mediaSets; 35 for (MediaSet set : mSets) { 36 set.addContentListener(this); 37 } 38 mName = name; 39 } 40 41 @Override getMediaItem(int start, int count)42 public ArrayList<MediaItem> getMediaItem(int start, int count) { 43 ArrayList<MediaItem> items = new ArrayList<MediaItem>(); 44 for (MediaSet set : mSets) { 45 int size = set.getMediaItemCount(); 46 if (count < 1) break; 47 if (start < size) { 48 int fetchCount = (start + count <= size) ? count : size - start; 49 ArrayList<MediaItem> fetchItems = set.getMediaItem(start, fetchCount); 50 items.addAll(fetchItems); 51 count -= fetchItems.size(); 52 start = 0; 53 } else { 54 start -= size; 55 } 56 } 57 return items; 58 } 59 60 @Override getMediaItemCount()61 public int getMediaItemCount() { 62 int count = 0; 63 for (MediaSet set : mSets) { 64 count += set.getMediaItemCount(); 65 } 66 return count; 67 } 68 69 @Override isLeafAlbum()70 public boolean isLeafAlbum() { 71 return true; 72 } 73 74 @Override getName()75 public String getName() { 76 return mName; 77 } 78 useNameOfChild(int i)79 public void useNameOfChild(int i) { 80 if (i < mSets.length) mName = mSets[i].getName(); 81 } 82 83 @Override reload()84 public long reload() { 85 boolean changed = false; 86 for (int i = 0, n = mSets.length; i < n; ++i) { 87 long version = mSets[i].reload(); 88 if (version > mDataVersion) changed = true; 89 } 90 if (changed) mDataVersion = nextVersionNumber(); 91 return mDataVersion; 92 } 93 94 @Override onContentDirty()95 public void onContentDirty() { 96 notifyContentChanged(); 97 } 98 99 @Override requestSync(SyncListener listener)100 public Future<Integer> requestSync(SyncListener listener) { 101 return requestSyncOnMultipleSets(mSets, listener); 102 } 103 } 104