Eugene Susla | 6ed45d8 | 2017-01-22 13:52:51 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 | |
| 18 | package android.provider; |
| 19 | |
| 20 | import android.content.ComponentName; |
| 21 | import android.content.ContentResolver; |
| 22 | import android.text.TextUtils; |
| 23 | |
| 24 | import com.android.internal.util.ArrayUtils; |
| 25 | |
Eugene Susla | cf00ade | 2017-04-10 11:51:58 -0700 | [diff] [blame] | 26 | import java.util.Collection; |
Eugene Susla | 6ed45d8 | 2017-01-22 13:52:51 -0800 | [diff] [blame] | 27 | import java.util.HashSet; |
| 28 | import java.util.Iterator; |
| 29 | import java.util.function.Function; |
| 30 | |
| 31 | /** |
| 32 | * Utilities for dealing with {@link String} values in {@link Settings} |
| 33 | * |
| 34 | * @hide |
| 35 | */ |
| 36 | public class SettingsStringUtil { |
| 37 | private SettingsStringUtil() {} |
| 38 | |
| 39 | public static final String DELIMITER = ":"; |
| 40 | |
| 41 | /** |
| 42 | * A {@link HashSet} of items, that uses a common convention of setting string |
| 43 | * serialization/deserialization of separating multiple items with {@link #DELIMITER} |
| 44 | */ |
| 45 | public static abstract class ColonDelimitedSet<T> extends HashSet<T> { |
| 46 | |
| 47 | public ColonDelimitedSet(String colonSeparatedItems) { |
| 48 | for (String cn : |
| 49 | TextUtils.split(TextUtils.emptyIfNull(colonSeparatedItems), DELIMITER)) { |
| 50 | add(itemFromString(cn)); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | protected abstract T itemFromString(String s); |
| 55 | protected String itemToString(T item) { |
| 56 | return String.valueOf(item); |
| 57 | } |
| 58 | |
| 59 | @Override |
| 60 | public String toString() { |
| 61 | StringBuilder sb = new StringBuilder(); |
| 62 | Iterator<T> it = iterator(); |
| 63 | if (it.hasNext()) { |
Phil Weaver | 806456f | 2017-02-14 09:18:03 -0800 | [diff] [blame] | 64 | sb.append(itemToString(it.next())); |
Eugene Susla | 6ed45d8 | 2017-01-22 13:52:51 -0800 | [diff] [blame] | 65 | while (it.hasNext()) { |
| 66 | sb.append(DELIMITER); |
| 67 | sb.append(itemToString(it.next())); |
| 68 | } |
| 69 | } |
| 70 | return sb.toString(); |
| 71 | } |
| 72 | |
| 73 | |
| 74 | public static class OfStrings extends ColonDelimitedSet<String> { |
| 75 | public OfStrings(String colonSeparatedItems) { |
| 76 | super(colonSeparatedItems); |
| 77 | } |
| 78 | |
| 79 | @Override |
| 80 | protected String itemFromString(String s) { |
| 81 | return s; |
| 82 | } |
| 83 | |
Eugene Susla | cf00ade | 2017-04-10 11:51:58 -0700 | [diff] [blame] | 84 | public static String addAll(String delimitedElements, Collection<String> elements) { |
| 85 | final ColonDelimitedSet<String> set |
| 86 | = new ColonDelimitedSet.OfStrings(delimitedElements); |
| 87 | return set.addAll(elements) ? set.toString() : delimitedElements; |
| 88 | } |
| 89 | |
Eugene Susla | 6ed45d8 | 2017-01-22 13:52:51 -0800 | [diff] [blame] | 90 | public static String add(String delimitedElements, String element) { |
| 91 | final ColonDelimitedSet<String> set |
| 92 | = new ColonDelimitedSet.OfStrings(delimitedElements); |
| 93 | if (set.contains(element)) { |
| 94 | return delimitedElements; |
| 95 | } |
| 96 | set.add(element); |
| 97 | return set.toString(); |
| 98 | } |
| 99 | |
| 100 | public static String remove(String delimitedElements, String element) { |
| 101 | final ColonDelimitedSet<String> set |
| 102 | = new ColonDelimitedSet.OfStrings(delimitedElements); |
| 103 | if (!set.contains(element)) { |
| 104 | return delimitedElements; |
| 105 | } |
| 106 | set.remove(element); |
| 107 | return set.toString(); |
| 108 | } |
| 109 | |
| 110 | public static boolean contains(String delimitedElements, String element) { |
| 111 | final String[] elements = TextUtils.split(delimitedElements, DELIMITER); |
| 112 | return ArrayUtils.indexOf(elements, element) != -1; |
| 113 | } |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | public static class ComponentNameSet extends ColonDelimitedSet<ComponentName> { |
| 118 | public ComponentNameSet(String colonSeparatedPackageNames) { |
| 119 | super(colonSeparatedPackageNames); |
| 120 | } |
| 121 | |
| 122 | @Override |
| 123 | protected ComponentName itemFromString(String s) { |
| 124 | return ComponentName.unflattenFromString(s); |
| 125 | } |
| 126 | |
| 127 | @Override |
| 128 | protected String itemToString(ComponentName item) { |
| 129 | return item.flattenToString(); |
| 130 | } |
| 131 | |
| 132 | public static String add(String delimitedElements, ComponentName element) { |
| 133 | final ComponentNameSet set = new ComponentNameSet(delimitedElements); |
| 134 | if (set.contains(element)) { |
| 135 | return delimitedElements; |
| 136 | } |
| 137 | set.add(element); |
| 138 | return set.toString(); |
| 139 | } |
| 140 | |
| 141 | public static String remove(String delimitedElements, ComponentName element) { |
| 142 | final ComponentNameSet set = new ComponentNameSet(delimitedElements); |
| 143 | if (!set.contains(element)) { |
| 144 | return delimitedElements; |
| 145 | } |
| 146 | set.remove(element); |
| 147 | return set.toString(); |
| 148 | } |
| 149 | |
| 150 | public static boolean contains(String delimitedElements, ComponentName element) { |
| 151 | return ColonDelimitedSet.OfStrings.contains( |
| 152 | delimitedElements, element.flattenToString()); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | public static class SettingStringHelper { |
| 157 | private final ContentResolver mContentResolver; |
| 158 | private final String mSettingName; |
| 159 | private final int mUserId; |
| 160 | |
| 161 | public SettingStringHelper(ContentResolver contentResolver, String name, int userId) { |
| 162 | mContentResolver = contentResolver; |
| 163 | mUserId = userId; |
| 164 | mSettingName = name; |
| 165 | } |
| 166 | |
| 167 | public String read() { |
| 168 | return Settings.Secure.getStringForUser( |
| 169 | mContentResolver, mSettingName, mUserId); |
| 170 | } |
| 171 | |
| 172 | public boolean write(String value) { |
| 173 | return Settings.Secure.putStringForUser( |
| 174 | mContentResolver, mSettingName, value, mUserId); |
| 175 | } |
| 176 | |
| 177 | public boolean modify(Function<String, String> change) { |
| 178 | return write(change.apply(read())); |
| 179 | } |
| 180 | } |
| 181 | } |