1 /*
2  * Copyright (C) 2010 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.R;
20 import com.android.gallery3d.app.GalleryApp;
21 import com.android.gallery3d.util.Future;
22 
23 // ComboAlbumSet combines multiple media sets into one. It lists all sub
24 // media sets from the input album sets.
25 // This only handles SubMediaSets, not MediaItems. (That's all we need now)
26 public class ComboAlbumSet extends MediaSet implements ContentListener {
27     @SuppressWarnings("unused")
28     private static final String TAG = "ComboAlbumSet";
29     private final MediaSet[] mSets;
30     private final String mName;
31 
ComboAlbumSet(Path path, GalleryApp application, MediaSet[] mediaSets)32     public ComboAlbumSet(Path path, GalleryApp application, MediaSet[] mediaSets) {
33         super(path, nextVersionNumber());
34         mSets = mediaSets;
35         for (MediaSet set : mSets) {
36             set.addContentListener(this);
37         }
38         mName = application.getResources().getString(
39                 R.string.set_label_all_albums);
40     }
41 
42     @Override
getSubMediaSet(int index)43     public MediaSet getSubMediaSet(int index) {
44         for (MediaSet set : mSets) {
45             int size = set.getSubMediaSetCount();
46             if (index < size) {
47                 return set.getSubMediaSet(index);
48             }
49             index -= size;
50         }
51         return null;
52     }
53 
54     @Override
getSubMediaSetCount()55     public int getSubMediaSetCount() {
56         int count = 0;
57         for (MediaSet set : mSets) {
58             count += set.getSubMediaSetCount();
59         }
60         return count;
61     }
62 
63     @Override
getName()64     public String getName() {
65         return mName;
66     }
67 
68     @Override
isLoading()69     public boolean isLoading() {
70         for (int i = 0, n = mSets.length; i < n; ++i) {
71             if (mSets[i].isLoading()) return true;
72         }
73         return false;
74     }
75 
76     @Override
reload()77     public long reload() {
78         boolean changed = false;
79         for (int i = 0, n = mSets.length; i < n; ++i) {
80             long version = mSets[i].reload();
81             if (version > mDataVersion) changed = true;
82         }
83         if (changed) mDataVersion = nextVersionNumber();
84         return mDataVersion;
85     }
86 
87     @Override
onContentDirty()88     public void onContentDirty() {
89         notifyContentChanged();
90     }
91 
92     @Override
requestSync(SyncListener listener)93     public Future<Integer> requestSync(SyncListener listener) {
94         return requestSyncOnMultipleSets(mSets, listener);
95     }
96 }
97