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/*
* Copyright (C) 2010 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.app.GalleryApp;
import android.content.Context;
import android.net.Uri;
import java.util.ArrayList;
import java.util.HashSet;
public class ClusterAlbumSet extends MediaSet implements ContentListener {
private static final String TAG = "ClusterAlbumSet";
private GalleryApp mApplication;
private MediaSet mBaseSet;
private int mKind;
private ArrayList<ClusterAlbum> mAlbums = new ArrayList<ClusterAlbum>();
private boolean mFirstReloadDone;
public ClusterAlbumSet(Path path, GalleryApp application,
MediaSet baseSet, int kind) {
super(path, INVALID_DATA_VERSION);
mApplication = application;
mBaseSet = baseSet;
mKind = kind;
baseSet.addContentListener(this);
}
@Override
public MediaSet getSubMediaSet(int index) {
return mAlbums.get(index);
}
@Override
public int getSubMediaSetCount() {
return mAlbums.size();
}
@Override
public String getName() {
return mBaseSet.getName();
}
@Override
public long reload() {
if (mBaseSet.reload() > mDataVersion) {
if (mFirstReloadDone) {
updateClustersContents();
} else {
updateClusters();
mFirstReloadDone = true;
}
mDataVersion = nextVersionNumber();
}
return mDataVersion;
}
public void onContentDirty() {
notifyContentChanged();
}
private void updateClusters() {
mAlbums.clear();
Clustering clustering;
Context context = mApplication.getAndroidContext();
switch (mKind) {
case ClusterSource.CLUSTER_ALBUMSET_TIME:
clustering = new TimeClustering(context);
break;
case ClusterSource.CLUSTER_ALBUMSET_LOCATION:
clustering = new LocationClustering(context);
break;
case ClusterSource.CLUSTER_ALBUMSET_TAG:
clustering = new TagClustering(context);
break;
case ClusterSource.CLUSTER_ALBUMSET_FACE:
clustering = new FaceClustering(context);
break;
default: /* CLUSTER_ALBUMSET_SIZE */
clustering = new SizeClustering(context);
break;
}
clustering.run(mBaseSet);
int n = clustering.getNumberOfClusters();
DataManager dataManager = mApplication.getDataManager();
for (int i = 0; i < n; i++) {
Path childPath;
String childName = clustering.getClusterName(i);
if (mKind == ClusterSource.CLUSTER_ALBUMSET_TAG) {
childPath = mPath.getChild(Uri.encode(childName));
} else if (mKind == ClusterSource.CLUSTER_ALBUMSET_SIZE) {
long minSize = ((SizeClustering) clustering).getMinSize(i);
childPath = mPath.getChild(minSize);
} else {
childPath = mPath.getChild(i);
}
ClusterAlbum album = (ClusterAlbum) dataManager.peekMediaObject(
childPath);
if (album == null) {
album = new ClusterAlbum(childPath, dataManager, this);
}
album.setMediaItems(clustering.getCluster(i));
album.setName(childName);
album.setCoverMediaItem(clustering.getClusterCover(i));
mAlbums.add(album);
}
}
private void updateClustersContents() {
final HashSet<Path> existing = new HashSet<Path>();
mBaseSet.enumerateTotalMediaItems(new MediaSet.ItemConsumer() {
public void consume(int index, MediaItem item) {
existing.add(item.getPath());
}
});
int n = mAlbums.size();
// The loop goes backwards because we may remove empty albums from
// mAlbums.
for (int i = n - 1; i >= 0; i--) {
ArrayList<Path> oldPaths = mAlbums.get(i).getMediaItems();
ArrayList<Path> newPaths = new ArrayList<Path>();
int m = oldPaths.size();
for (int j = 0; j < m; j++) {
Path p = oldPaths.get(j);
if (existing.contains(p)) {
newPaths.add(p);
}
}
mAlbums.get(i).setMediaItems(newPaths);
if (newPaths.isEmpty()) {
mAlbums.remove(i);
}
}
}
}
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