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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.dreams.phototable;
     17 
     18 import android.content.SharedPreferences;
     19 
     20 import java.util.Collection;
     21 import java.util.HashMap;
     22 import java.util.HashSet;
     23 import java.util.Set;
     24 
     25 /**
     26  * Common utilities for album settings.
     27  */
     28 public class AlbumSettings {
     29     public static final String ALBUM_SET = "Enabled Album Set V2";
     30 
     31     private static HashMap<SharedPreferences, AlbumSettings> singletons;
     32 
     33     private final SharedPreferences mSettings;
     34     private final HashSet<String> mEnabledAlbums;
     35 
     36     public static AlbumSettings getAlbumSettings(SharedPreferences settings) {
     37         if (singletons == null) {
     38             singletons = new HashMap<SharedPreferences, AlbumSettings>();
     39         }
     40         if (!singletons.containsKey(settings)) {
     41             singletons.put(settings, new AlbumSettings(settings));
     42         }
     43         return singletons.get(settings);
     44     }
     45 
     46     public void readEnabledAlbums() {
     47         synchronized (mEnabledAlbums) {
     48             readEnabledAlbumsLocked();
     49         }
     50     }
     51 
     52     public boolean isAlbumEnabled(String albumId) {
     53         synchronized (mEnabledAlbums) {
     54             return mEnabledAlbums.contains(albumId);
     55         }
     56     }
     57 
     58     public boolean areAllEnabled(Collection<String> validAlbums) {
     59         synchronized (mEnabledAlbums) {
     60             return mEnabledAlbums.containsAll(validAlbums);
     61         }
     62     }
     63 
     64     public void setAlbumEnabled(String albumId, boolean enabled) {
     65         if (isAlbumEnabled(albumId) != enabled) {
     66             synchronized (mEnabledAlbums) {
     67                 readEnabledAlbumsLocked();
     68                 if (enabled) {
     69                     mEnabledAlbums.add(albumId);
     70                 } else {
     71                     mEnabledAlbums.remove(albumId);
     72                 }
     73                 writeEnabledAlbumsLocked();
     74             }
     75         }
     76     }
     77 
     78     public void disableAllAlbums() {
     79         synchronized (mEnabledAlbums) {
     80             mEnabledAlbums.clear();
     81             writeEnabledAlbumsLocked();
     82         }
     83     }
     84 
     85     public void enableAllAlbums(Collection<String> validAlbums) {
     86         synchronized (mEnabledAlbums) {
     87             mEnabledAlbums.clear();
     88             mEnabledAlbums.addAll(validAlbums);
     89             writeEnabledAlbumsLocked();
     90         }
     91     }
     92 
     93     public void pruneObsoleteSettings(Collection<String> validAlbums) {
     94         if (!validAlbums.containsAll(mEnabledAlbums)) {
     95             synchronized (mEnabledAlbums) {
     96                 readEnabledAlbumsLocked();
     97                 mEnabledAlbums.retainAll(validAlbums);
     98                 writeEnabledAlbumsLocked();
     99             }
    100         }
    101     }
    102 
    103     public  boolean isConfigured() {
    104         synchronized (mEnabledAlbums) {
    105             return mEnabledAlbums.size() != 0;
    106         }
    107     }
    108 
    109     private AlbumSettings(SharedPreferences settings) {
    110         mSettings = settings;
    111         mEnabledAlbums = new HashSet<String>();
    112         readEnabledAlbums();
    113     }
    114 
    115     private void readEnabledAlbumsLocked() {
    116         Set<String> enabledAlbums = mSettings.getStringSet(ALBUM_SET, null);
    117         mEnabledAlbums.clear();
    118         if (enabledAlbums != null) {
    119             mEnabledAlbums.addAll(enabledAlbums);
    120         }
    121     }
    122 
    123     private void writeEnabledAlbumsLocked() {
    124         SharedPreferences.Editor editor = mSettings.edit();
    125         // Give SharedSettings a copy, so that we are free to manipulate ours.
    126         editor.putStringSet(ALBUM_SET, new HashSet<String>(mEnabledAlbums));
    127         editor.commit();
    128     }
    129 }
    130