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/*
* Copyright (C) 2017 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 android.provider;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.text.TextUtils;
import com.android.internal.util.ArrayUtils;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.function.Function;
/**
* Utilities for dealing with {@link String} values in {@link Settings}
*
* @hide
*/
public class SettingsStringUtil {
private SettingsStringUtil() {}
public static final String DELIMITER = ":";
/**
* A {@link HashSet} of items, that uses a common convention of setting string
* serialization/deserialization of separating multiple items with {@link #DELIMITER}
*/
public static abstract class ColonDelimitedSet<T> extends HashSet<T> {
public ColonDelimitedSet(String colonSeparatedItems) {
for (String cn :
TextUtils.split(TextUtils.emptyIfNull(colonSeparatedItems), DELIMITER)) {
add(itemFromString(cn));
}
}
protected abstract T itemFromString(String s);
protected String itemToString(T item) {
return String.valueOf(item);
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
Iterator<T> it = iterator();
if (it.hasNext()) {
sb.append(itemToString(it.next()));
while (it.hasNext()) {
sb.append(DELIMITER);
sb.append(itemToString(it.next()));
}
}
return sb.toString();
}
public static class OfStrings extends ColonDelimitedSet<String> {
public OfStrings(String colonSeparatedItems) {
super(colonSeparatedItems);
}
@Override
protected String itemFromString(String s) {
return s;
}
public static String addAll(String delimitedElements, Collection<String> elements) {
final ColonDelimitedSet<String> set
= new ColonDelimitedSet.OfStrings(delimitedElements);
return set.addAll(elements) ? set.toString() : delimitedElements;
}
public static String add(String delimitedElements, String element) {
final ColonDelimitedSet<String> set
= new ColonDelimitedSet.OfStrings(delimitedElements);
if (set.contains(element)) {
return delimitedElements;
}
set.add(element);
return set.toString();
}
public static String remove(String delimitedElements, String element) {
final ColonDelimitedSet<String> set
= new ColonDelimitedSet.OfStrings(delimitedElements);
if (!set.contains(element)) {
return delimitedElements;
}
set.remove(element);
return set.toString();
}
public static boolean contains(String delimitedElements, String element) {
final String[] elements = TextUtils.split(delimitedElements, DELIMITER);
return ArrayUtils.indexOf(elements, element) != -1;
}
}
}
public static class ComponentNameSet extends ColonDelimitedSet<ComponentName> {
public ComponentNameSet(String colonSeparatedPackageNames) {
super(colonSeparatedPackageNames);
}
@Override
protected ComponentName itemFromString(String s) {
return ComponentName.unflattenFromString(s);
}
@Override
protected String itemToString(ComponentName item) {
return item.flattenToString();
}
public static String add(String delimitedElements, ComponentName element) {
final ComponentNameSet set = new ComponentNameSet(delimitedElements);
if (set.contains(element)) {
return delimitedElements;
}
set.add(element);
return set.toString();
}
public static String remove(String delimitedElements, ComponentName element) {
final ComponentNameSet set = new ComponentNameSet(delimitedElements);
if (!set.contains(element)) {
return delimitedElements;
}
set.remove(element);
return set.toString();
}
public static boolean contains(String delimitedElements, ComponentName element) {
return ColonDelimitedSet.OfStrings.contains(
delimitedElements, element.flattenToString());
}
}
public static class SettingStringHelper {
private final ContentResolver mContentResolver;
private final String mSettingName;
private final int mUserId;
public SettingStringHelper(ContentResolver contentResolver, String name, int userId) {
mContentResolver = contentResolver;
mUserId = userId;
mSettingName = name;
}
public String read() {
return Settings.Secure.getStringForUser(
mContentResolver, mSettingName, mUserId);
}
public boolean write(String value) {
return Settings.Secure.putStringForUser(
mContentResolver, mSettingName, value, mUserId);
}
public boolean modify(Function<String, String> change) {
return write(change.apply(read()));
}
}
}
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