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/*
* Copyright (C) 2012 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.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore.Images;
import android.provider.MediaStore.MediaColumns;
import android.provider.MediaStore.Video;
import com.android.gallery3d.app.GalleryApp;
import com.android.gallery3d.app.StitchingChangeListener;
import com.android.gallery3d.util.MediaSetUtils;
import java.util.ArrayList;
// This class lists all media items added by the client.
public class SecureAlbum extends MediaSet implements StitchingChangeListener {
@SuppressWarnings("unused")
private static final String TAG = "SecureAlbum";
private static final String[] PROJECTION = {MediaColumns._ID};
private int mMinImageId = Integer.MAX_VALUE; // the smallest id of images
private int mMaxImageId = Integer.MIN_VALUE; // the biggest id in images
private int mMinVideoId = Integer.MAX_VALUE; // the smallest id of videos
private int mMaxVideoId = Integer.MIN_VALUE; // the biggest id of videos
// All the media items added by the client.
private ArrayList<Path> mAllItems = new ArrayList<Path>();
// The types of items in mAllItems. True is video and false is image.
private ArrayList<Boolean> mAllItemTypes = new ArrayList<Boolean>();
private ArrayList<Path> mExistingItems = new ArrayList<Path>();
private Context mContext;
private DataManager mDataManager;
private static final Uri[] mWatchUris =
{Images.Media.EXTERNAL_CONTENT_URI, Video.Media.EXTERNAL_CONTENT_URI};
private final ChangeNotifier mNotifier;
// A placeholder image in the end of secure album. When it is tapped, it
// will take the user to the lock screen.
private MediaItem mUnlockItem;
private boolean mShowUnlockItem;
public SecureAlbum(Path path, GalleryApp application, MediaItem unlock) {
super(path, nextVersionNumber());
mContext = application.getAndroidContext();
mDataManager = application.getDataManager();
mNotifier = new ChangeNotifier(this, mWatchUris, application);
mUnlockItem = unlock;
mShowUnlockItem = (!isCameraBucketEmpty(Images.Media.EXTERNAL_CONTENT_URI)
|| !isCameraBucketEmpty(Video.Media.EXTERNAL_CONTENT_URI));
}
public void addMediaItem(boolean isVideo, int id) {
Path pathBase;
if (isVideo) {
pathBase = LocalVideo.ITEM_PATH;
mMinVideoId = Math.min(mMinVideoId, id);
mMaxVideoId = Math.max(mMaxVideoId, id);
} else {
pathBase = LocalImage.ITEM_PATH;
mMinImageId = Math.min(mMinImageId, id);
mMaxImageId = Math.max(mMaxImageId, id);
}
Path path = pathBase.getChild(id);
if (!mAllItems.contains(path)) {
mAllItems.add(path);
mAllItemTypes.add(isVideo);
mNotifier.fakeChange();
}
}
// The sequence is stitching items, local media items, and unlock image.
@Override
public ArrayList<MediaItem> getMediaItem(int start, int count) {
int existingCount = mExistingItems.size();
if (start >= existingCount + 1) {
return new ArrayList<MediaItem>();
}
// Add paths of requested stitching items.
int end = Math.min(start + count, existingCount);
ArrayList<Path> subset = new ArrayList<Path>(mExistingItems.subList(start, end));
// Convert paths to media items.
final MediaItem[] buf = new MediaItem[end - start];
ItemConsumer consumer = new ItemConsumer() {
@Override
public void consume(int index, MediaItem item) {
buf[index] = item;
}
};
mDataManager.mapMediaItems(subset, consumer, 0);
ArrayList<MediaItem> result = new ArrayList<MediaItem>(end - start);
for (int i = 0; i < buf.length; i++) {
result.add(buf[i]);
}
if (mShowUnlockItem) result.add(mUnlockItem);
return result;
}
@Override
public int getMediaItemCount() {
return (mExistingItems.size() + (mShowUnlockItem ? 1 : 0));
}
@Override
public String getName() {
return "secure";
}
@Override
public long reload() {
if (mNotifier.isDirty()) {
mDataVersion = nextVersionNumber();
updateExistingItems();
}
return mDataVersion;
}
private ArrayList<Integer> queryExistingIds(Uri uri, int minId, int maxId) {
ArrayList<Integer> ids = new ArrayList<Integer>();
if (minId == Integer.MAX_VALUE || maxId == Integer.MIN_VALUE) return ids;
String[] selectionArgs = {String.valueOf(minId), String.valueOf(maxId)};
Cursor cursor = mContext.getContentResolver().query(uri, PROJECTION,
"_id BETWEEN ? AND ?", selectionArgs, null);
if (cursor == null) return ids;
try {
while (cursor.moveToNext()) {
ids.add(cursor.getInt(0));
}
} finally {
cursor.close();
}
return ids;
}
private boolean isCameraBucketEmpty(Uri baseUri) {
Uri uri = baseUri.buildUpon()
.appendQueryParameter("limit", "1").build();
String[] selection = {String.valueOf(MediaSetUtils.CAMERA_BUCKET_ID)};
Cursor cursor = mContext.getContentResolver().query(uri, PROJECTION,
"bucket_id = ?", selection, null);
if (cursor == null) return true;
try {
return (cursor.getCount() == 0);
} finally {
cursor.close();
}
}
private void updateExistingItems() {
if (mAllItems.size() == 0) return;
// Query existing ids.
ArrayList<Integer> imageIds = queryExistingIds(
Images.Media.EXTERNAL_CONTENT_URI, mMinImageId, mMaxImageId);
ArrayList<Integer> videoIds = queryExistingIds(
Video.Media.EXTERNAL_CONTENT_URI, mMinVideoId, mMaxVideoId);
// Construct the existing items list.
mExistingItems.clear();
for (int i = mAllItems.size() - 1; i >= 0; i--) {
Path path = mAllItems.get(i);
boolean isVideo = mAllItemTypes.get(i);
int id = Integer.parseInt(path.getSuffix());
if (isVideo) {
if (videoIds.contains(id)) mExistingItems.add(path);
} else {
if (imageIds.contains(id)) mExistingItems.add(path);
}
}
}
@Override
public boolean isLeafAlbum() {
return true;
}
@Override
public void onStitchingQueued(Uri uri) {
int id = Integer.parseInt(uri.getLastPathSegment());
addMediaItem(false, id);
}
@Override
public void onStitchingResult(Uri uri) {
}
@Override
public void onStitchingProgress(Uri uri, final int progress) {
}
}
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