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