1 /*
2  * Copyright (C) 2022 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.car.audio;
18 
19 import android.database.ContentObserver;
20 import android.net.Uri;
21 import android.os.Handler;
22 import android.os.Looper;
23 
24 import java.util.Objects;
25 
26 final class ContentObserverFactory {
27 
28     private final Uri mUri;
29 
ContentObserverFactory(Uri uri)30     ContentObserverFactory(Uri uri) {
31         mUri = Objects.requireNonNull(uri, "Uri cannot be null");
32     }
33 
createObserver(ContentChangeCallback wrapper)34     ContentObserver createObserver(ContentChangeCallback wrapper) {
35         Objects.requireNonNull(wrapper, "Content Change Callback cannot be null");
36 
37         return new ContentObserver(new Handler(Looper.getMainLooper())) {
38             @Override
39             public void onChange(boolean selfChange, Uri uri) {
40                 if (mUri.equals(uri)) {
41                     wrapper.onChange();
42                 }
43             }
44         };
45     }
46 
47     interface ContentChangeCallback {
48         void onChange();
49     }
50 }
51