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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.dreams.phototable;
import android.content.Context;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.provider.MediaStore;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Set;
/**
* Loads images from the local store.
*/
public class LocalSource extends PhotoSource {
private static final String TAG = "PhotoTable.LocalSource";
private final String mUnknownAlbumName;
private final String mLocalSourceName;
private Set<String> mFoundAlbumIds;
private int mNextPosition;
public LocalSource(Context context, SharedPreferences settings) {
super(context, settings);
mLocalSourceName = mResources.getString(R.string.local_source_name, "Photos on Device");
mUnknownAlbumName = mResources.getString(R.string.unknown_album_name, "Unknown");
mSourceName = TAG;
mNextPosition = -1;
fillQueue();
}
private Set<String> getFoundAlbums() {
if (mFoundAlbumIds == null) {
findAlbums();
}
return mFoundAlbumIds;
}
@Override
public Collection<AlbumData> findAlbums() {
log(TAG, "finding albums");
HashMap<String, AlbumData> foundAlbums = new HashMap<String, AlbumData>();
String[] projection = {MediaStore.Images.Media.DATA, MediaStore.Images.Media.BUCKET_ID,
MediaStore.Images.Media.BUCKET_DISPLAY_NAME, MediaStore.Images.Media.DATE_TAKEN};
// This is a horrible hack that closes the where clause and injects a grouping clause.
Cursor cursor = mResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection, null, null, null);
if (cursor != null) {
cursor.moveToFirst();
int dataIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
int bucketIndex = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_ID);
int nameIndex = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
int updatedIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATE_TAKEN);
if (bucketIndex < 0) {
log(TAG, "can't find the ID column!");
} else {
while (!cursor.isAfterLast()) {
String id = TAG + ":" + cursor.getString(bucketIndex);
AlbumData data = foundAlbums.get(id);
if (foundAlbums.get(id) == null) {
data = new AlbumData();
data.id = id;
data.account = mLocalSourceName;
if (dataIndex >= 0) {
data.thumbnailUrl = cursor.getString(dataIndex);
}
if (nameIndex >= 0) {
data.title = cursor.getString(nameIndex);
} else {
data.title = mUnknownAlbumName;
}
log(TAG, data.title + " found");
foundAlbums.put(id, data);
}
if (updatedIndex >= 0) {
long updated = cursor.getLong(updatedIndex);
data.updated = (data.updated == 0 ?
updated :
Math.min(data.updated, updated));
}
cursor.moveToNext();
}
}
cursor.close();
}
log(TAG, "found " + foundAlbums.size() + " items.");
mFoundAlbumIds = foundAlbums.keySet();
return foundAlbums.values();
}
@Override
protected Collection<ImageData> findImages(int howMany) {
log(TAG, "finding images");
LinkedList<ImageData> foundImages = new LinkedList<ImageData>();
String[] projection = {MediaStore.Images.Media.DATA, MediaStore.Images.Media.ORIENTATION,
MediaStore.Images.Media.BUCKET_ID, MediaStore.Images.Media.BUCKET_DISPLAY_NAME};
String selection = "";
for (String id : getFoundAlbums()) {
if (mSettings.isAlbumEnabled(id)) {
String[] parts = id.split(":");
if (parts.length > 1) {
if (selection.length() > 0) {
selection += " OR ";
}
selection += MediaStore.Images.Media.BUCKET_ID + " = '" + parts[1] + "'";
}
}
}
if (selection.isEmpty()) {
return foundImages;
}
Cursor cursor = mResolver.query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
projection, selection, null, null);
if (cursor != null) {
if (cursor.getCount() > howMany && mNextPosition == -1) {
mNextPosition = mRNG.nextInt() % (cursor.getCount() - howMany);
}
if (mNextPosition == -1) {
mNextPosition = 0;
}
cursor.moveToPosition(mNextPosition);
int dataIndex = cursor.getColumnIndex(MediaStore.Images.Media.DATA);
int orientationIndex = cursor.getColumnIndex(MediaStore.Images.Media.ORIENTATION);
int bucketIndex = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_ID);
int nameIndex = cursor.getColumnIndex(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
if (dataIndex < 0) {
log(TAG, "can't find the DATA column!");
} else {
while (foundImages.size() < howMany && !cursor.isAfterLast()) {
ImageData data = new ImageData();
data.url = cursor.getString(dataIndex);
data.orientation = cursor.getInt(orientationIndex);
foundImages.offer(data);
if (cursor.moveToNext()) {
mNextPosition++;
}
}
if (cursor.isAfterLast()) {
mNextPosition = 0;
}
}
cursor.close();
}
log(TAG, "found " + foundImages.size() + " items.");
return foundImages;
}
@Override
protected InputStream getStream(ImageData data, int longSide) {
FileInputStream fis = null;
try {
log(TAG, "opening:" + data.url);
fis = new FileInputStream(data.url);
} catch (Exception ex) {
log(TAG, ex.toString());
fis = null;
}
return (InputStream) fis;
}
}
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