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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 android.net.Uri;
import android.os.Handler;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.Video;
import com.android.gallery3d.R;
import com.android.gallery3d.app.GalleryApp;
import com.android.gallery3d.data.BucketHelper.BucketEntry;
import com.android.gallery3d.util.Future;
import com.android.gallery3d.util.FutureListener;
import com.android.gallery3d.util.LightCycleHelper;
import com.android.gallery3d.util.MediaSetUtils;
import com.android.gallery3d.util.ThreadPool;
import com.android.gallery3d.util.ThreadPool.JobContext;
import java.util.ArrayList;
import java.util.Comparator;
// LocalAlbumSet lists all image or video albums in the local storage.
// The path should be "/local/image", "local/video" or "/local/all"
public class LocalAlbumSet extends MediaSet
implements FutureListener<ArrayList<MediaSet>> {
@SuppressWarnings("unused")
private static final String TAG = "LocalAlbumSet";
public static final Path PATH_ALL = Path.fromString("/local/all");
public static final Path PATH_IMAGE = Path.fromString("/local/image");
public static final Path PATH_VIDEO = Path.fromString("/local/video");
private static final Uri[] mWatchUris =
{Images.Media.EXTERNAL_CONTENT_URI, Video.Media.EXTERNAL_CONTENT_URI};
private final GalleryApp mApplication;
private final int mType;
private ArrayList<MediaSet> mAlbums = new ArrayList<MediaSet>();
private final ChangeNotifier mNotifier;
private final String mName;
private final Handler mHandler;
private boolean mIsLoading;
private Future<ArrayList<MediaSet>> mLoadTask;
private ArrayList<MediaSet> mLoadBuffer;
public LocalAlbumSet(Path path, GalleryApp application) {
super(path, nextVersionNumber());
mApplication = application;
mHandler = new Handler(application.getMainLooper());
mType = getTypeFromPath(path);
mNotifier = new ChangeNotifier(this, mWatchUris, application);
mName = application.getResources().getString(
R.string.set_label_local_albums);
}
private static int getTypeFromPath(Path path) {
String name[] = path.split();
if (name.length < 2) {
throw new IllegalArgumentException(path.toString());
}
return getTypeFromString(name[1]);
}
@Override
public MediaSet getSubMediaSet(int index) {
return mAlbums.get(index);
}
@Override
public int getSubMediaSetCount() {
return mAlbums.size();
}
@Override
public String getName() {
return mName;
}
private static int findBucket(BucketEntry entries[], int bucketId) {
for (int i = 0, n = entries.length; i < n; ++i) {
if (entries[i].bucketId == bucketId) return i;
}
return -1;
}
private class AlbumsLoader implements ThreadPool.Job<ArrayList<MediaSet>> {
@Override
@SuppressWarnings("unchecked")
public ArrayList<MediaSet> run(JobContext jc) {
// Note: it will be faster if we only select media_type and bucket_id.
// need to test the performance if that is worth
BucketEntry[] entries = BucketHelper.loadBucketEntries(
jc, mApplication.getContentResolver(), mType);
if (jc.isCancelled()) return null;
int offset = 0;
// Move camera and download bucket to the front, while keeping the
// order of others.
int index = findBucket(entries, MediaSetUtils.CAMERA_BUCKET_ID);
if (index != -1) {
circularShiftRight(entries, offset++, index);
}
index = findBucket(entries, MediaSetUtils.DOWNLOAD_BUCKET_ID);
if (index != -1) {
circularShiftRight(entries, offset++, index);
}
ArrayList<MediaSet> albums = new ArrayList<MediaSet>();
DataManager dataManager = mApplication.getDataManager();
for (BucketEntry entry : entries) {
MediaSet album = getLocalAlbum(dataManager,
mType, mPath, entry.bucketId, entry.bucketName);
if (LightCycleHelper.hasLightCycleCapture(mApplication.getAndroidContext())
&& album.isCameraRoll()) {
album = dataManager.getMediaSet(Path.fromString(
LightCycleHelper.wrapGalleryPath(album.getPath().toString())));
}
albums.add(album);
}
return albums;
}
}
private MediaSet getLocalAlbum(
DataManager manager, int type, Path parent, int id, String name) {
synchronized (DataManager.LOCK) {
Path path = parent.getChild(id);
MediaObject object = manager.peekMediaObject(path);
if (object != null) return (MediaSet) object;
switch (type) {
case MEDIA_TYPE_IMAGE:
return new LocalAlbum(path, mApplication, id, true, name);
case MEDIA_TYPE_VIDEO:
return new LocalAlbum(path, mApplication, id, false, name);
case MEDIA_TYPE_ALL:
Comparator<MediaItem> comp = DataManager.sDateTakenComparator;
return new LocalMergeAlbum(path, comp, new MediaSet[] {
getLocalAlbum(manager, MEDIA_TYPE_IMAGE, PATH_IMAGE, id, name),
getLocalAlbum(manager, MEDIA_TYPE_VIDEO, PATH_VIDEO, id, name)}, id);
}
throw new IllegalArgumentException(String.valueOf(type));
}
}
@Override
public synchronized boolean isLoading() {
return mIsLoading;
}
@Override
// synchronized on this function for
// 1. Prevent calling reload() concurrently.
// 2. Prevent calling onFutureDone() and reload() concurrently
public synchronized long reload() {
if (mNotifier.isDirty()) {
if (mLoadTask != null) mLoadTask.cancel();
mIsLoading = true;
mLoadTask = mApplication.getThreadPool().submit(new AlbumsLoader(), this);
}
if (mLoadBuffer != null) {
mAlbums = mLoadBuffer;
mLoadBuffer = null;
for (MediaSet album : mAlbums) {
album.reload();
}
mDataVersion = nextVersionNumber();
}
return mDataVersion;
}
@Override
public synchronized void onFutureDone(Future<ArrayList<MediaSet>> future) {
if (mLoadTask != future) return; // ignore, wait for the latest task
mLoadBuffer = future.get();
mIsLoading = false;
if (mLoadBuffer == null) mLoadBuffer = new ArrayList<MediaSet>();
mHandler.post(new Runnable() {
@Override
public void run() {
notifyContentChanged();
}
});
}
// For debug only. Fake there is a ContentObserver.onChange() event.
void fakeChange() {
mNotifier.fakeChange();
}
// Circular shift the array range from a[i] to a[j] (inclusive). That is,
// a[i] -> a[i+1] -> a[i+2] -> ... -> a[j], and a[j] -> a[i]
private static <T> void circularShiftRight(T[] array, int i, int j) {
T temp = array[j];
for (int k = j; k > i; k--) {
array[k] = array[k - 1];
}
array[i] = temp;
}
}
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