1 /* 2 * Copyright (C) 2016 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 17 package com.android.deskclock.data; 18 19 import android.content.SharedPreferences; 20 import android.net.Uri; 21 22 import java.util.ArrayList; 23 import java.util.Collections; 24 import java.util.HashSet; 25 import java.util.List; 26 import java.util.Set; 27 28 /** 29 * This class encapsulates the transfer of data between {@link CustomRingtone} domain objects and 30 * their permanent storage in {@link SharedPreferences}. 31 */ 32 final class CustomRingtoneDAO { 33 34 /** Key to a preference that stores the set of all custom ringtone ids. */ 35 private static final String RINGTONE_IDS = "ringtone_ids"; 36 37 /** Key to a preference that stores the next unused ringtone id. */ 38 private static final String NEXT_RINGTONE_ID = "next_ringtone_id"; 39 40 /** Prefix for a key to a preference that stores the URI associated with the ringtone id. */ 41 private static final String RINGTONE_URI = "ringtone_uri_"; 42 43 /** Prefix for a key to a preference that stores the title associated with the ringtone id. */ 44 private static final String RINGTONE_TITLE = "ringtone_title_"; 45 CustomRingtoneDAO()46 private CustomRingtoneDAO() {} 47 48 /** 49 * @param uri points to an audio file located on the file system 50 * @param title the title of the audio content at the given {@code uri} 51 * @return the newly added custom ringtone 52 */ addCustomRingtone(SharedPreferences prefs, Uri uri, String title)53 static CustomRingtone addCustomRingtone(SharedPreferences prefs, Uri uri, String title) { 54 final long id = prefs.getLong(NEXT_RINGTONE_ID, 0); 55 final Set<String> ids = getRingtoneIds(prefs); 56 ids.add(String.valueOf(id)); 57 58 prefs.edit() 59 .putString(RINGTONE_URI + id, uri.toString()) 60 .putString(RINGTONE_TITLE + id, title) 61 .putLong(NEXT_RINGTONE_ID, id + 1) 62 .putStringSet(RINGTONE_IDS, ids) 63 .apply(); 64 65 return new CustomRingtone(id, uri, title, true); 66 } 67 68 /** 69 * @param id identifies the ringtone to be removed 70 */ removeCustomRingtone(SharedPreferences prefs, long id)71 static void removeCustomRingtone(SharedPreferences prefs, long id) { 72 final Set<String> ids = getRingtoneIds(prefs); 73 ids.remove(String.valueOf(id)); 74 75 final SharedPreferences.Editor editor = prefs.edit(); 76 editor.remove(RINGTONE_URI + id); 77 editor.remove(RINGTONE_TITLE + id); 78 if (ids.isEmpty()) { 79 editor.remove(RINGTONE_IDS); 80 editor.remove(NEXT_RINGTONE_ID); 81 } else { 82 editor.putStringSet(RINGTONE_IDS, ids); 83 } 84 editor.apply(); 85 } 86 87 /** 88 * @return a list of all known custom ringtones 89 */ getCustomRingtones(SharedPreferences prefs)90 static List<CustomRingtone> getCustomRingtones(SharedPreferences prefs) { 91 final Set<String> ids = prefs.getStringSet(RINGTONE_IDS, Collections.<String>emptySet()); 92 final List<CustomRingtone> ringtones = new ArrayList<>(ids.size()); 93 94 for (String id : ids) { 95 final long idLong = Long.parseLong(id); 96 final Uri uri = Uri.parse(prefs.getString(RINGTONE_URI + id, null)); 97 final String title = prefs.getString(RINGTONE_TITLE + id, null); 98 ringtones.add(new CustomRingtone(idLong, uri, title, true)); 99 } 100 101 return ringtones; 102 } 103 getRingtoneIds(SharedPreferences prefs)104 private static Set<String> getRingtoneIds(SharedPreferences prefs) { 105 return new HashSet<>(prefs.getStringSet(RINGTONE_IDS, Collections.<String>emptySet())); 106 } 107 }