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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.SharedPreferences;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
/**
* Common utilities for album settings.
*/
public class AlbumSettings {
public static final String ALBUM_SET = "Enabled Album Set V2";
private static HashMap<SharedPreferences, AlbumSettings> singletons;
private final SharedPreferences mSettings;
private final HashSet<String> mEnabledAlbums;
public static AlbumSettings getAlbumSettings(SharedPreferences settings) {
if (singletons == null) {
singletons = new HashMap<SharedPreferences, AlbumSettings>();
}
if (!singletons.containsKey(settings)) {
singletons.put(settings, new AlbumSettings(settings));
}
return singletons.get(settings);
}
public void readEnabledAlbums() {
synchronized (mEnabledAlbums) {
readEnabledAlbumsLocked();
}
}
public boolean isAlbumEnabled(String albumId) {
synchronized (mEnabledAlbums) {
return mEnabledAlbums.contains(albumId);
}
}
public boolean areAllEnabled(Collection<String> validAlbums) {
synchronized (mEnabledAlbums) {
return mEnabledAlbums.containsAll(validAlbums);
}
}
public void setAlbumEnabled(String albumId, boolean enabled) {
if (isAlbumEnabled(albumId) != enabled) {
synchronized (mEnabledAlbums) {
readEnabledAlbumsLocked();
if (enabled) {
mEnabledAlbums.add(albumId);
} else {
mEnabledAlbums.remove(albumId);
}
writeEnabledAlbumsLocked();
}
}
}
public void disableAllAlbums() {
synchronized (mEnabledAlbums) {
mEnabledAlbums.clear();
writeEnabledAlbumsLocked();
}
}
public void enableAllAlbums(Collection<String> validAlbums) {
synchronized (mEnabledAlbums) {
mEnabledAlbums.clear();
mEnabledAlbums.addAll(validAlbums);
writeEnabledAlbumsLocked();
}
}
public void pruneObsoleteSettings(Collection<String> validAlbums) {
if (!validAlbums.containsAll(mEnabledAlbums)) {
synchronized (mEnabledAlbums) {
readEnabledAlbumsLocked();
mEnabledAlbums.retainAll(validAlbums);
writeEnabledAlbumsLocked();
}
}
}
public boolean isConfigured() {
synchronized (mEnabledAlbums) {
return mEnabledAlbums.size() != 0;
}
}
private AlbumSettings(SharedPreferences settings) {
mSettings = settings;
mEnabledAlbums = new HashSet<String>();
readEnabledAlbums();
}
private void readEnabledAlbumsLocked() {
Set<String> enabledAlbums = mSettings.getStringSet(ALBUM_SET, null);
mEnabledAlbums.clear();
if (enabledAlbums != null) {
mEnabledAlbums.addAll(enabledAlbums);
}
}
private void writeEnabledAlbumsLocked() {
SharedPreferences.Editor editor = mSettings.edit();
// Give SharedSettings a copy, so that we are free to manipulate ours.
editor.putStringSet(ALBUM_SET, new HashSet<String>(mEnabledAlbums));
editor.commit();
}
}
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