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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.gallery3d.data;
import com.android.gallery3d.util.Future;
import java.util.ArrayList;
// ComboAlbum combines multiple media sets into one. It lists all media items
// from the input albums.
// This only handles SubMediaSets, not MediaItems. (That's all we need now)
public class ComboAlbum extends MediaSet implements ContentListener {
@SuppressWarnings("unused")
private static final String TAG = "ComboAlbum";
private final MediaSet[] mSets;
private String mName;
public ComboAlbum(Path path, MediaSet[] mediaSets, String name) {
super(path, nextVersionNumber());
mSets = mediaSets;
for (MediaSet set : mSets) {
set.addContentListener(this);
}
mName = name;
}
@Override
public ArrayList<MediaItem> getMediaItem(int start, int count) {
ArrayList<MediaItem> items = new ArrayList<MediaItem>();
for (MediaSet set : mSets) {
int size = set.getMediaItemCount();
if (count < 1) break;
if (start < size) {
int fetchCount = (start + count <= size) ? count : size - start;
ArrayList<MediaItem> fetchItems = set.getMediaItem(start, fetchCount);
items.addAll(fetchItems);
count -= fetchItems.size();
start = 0;
} else {
start -= size;
}
}
return items;
}
@Override
public int getMediaItemCount() {
int count = 0;
for (MediaSet set : mSets) {
count += set.getMediaItemCount();
}
return count;
}
@Override
public boolean isLeafAlbum() {
return true;
}
@Override
public String getName() {
return mName;
}
public void useNameOfChild(int i) {
if (i < mSets.length) mName = mSets[i].getName();
}
@Override
public long reload() {
boolean changed = false;
for (int i = 0, n = mSets.length; i < n; ++i) {
long version = mSets[i].reload();
if (version > mDataVersion) changed = true;
}
if (changed) mDataVersion = nextVersionNumber();
return mDataVersion;
}
@Override
public void onContentDirty() {
notifyContentChanged();
}
@Override
public Future<Integer> requestSync(SyncListener listener) {
return requestSyncOnMultipleSets(mSets, listener);
}
}
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