ContentObservable.java revision 54b6cfa9a9e5b861a9930af873580d6dc20f773c 
1/*
2 * Copyright (C) 2007 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
17package android.database;
18
19/**
20 * A specialization of Observable for ContentObserver that provides methods for
21 * invoking the various callback methods of ContentObserver.
22 */
23public class ContentObservable extends Observable<ContentObserver> {
24
25    @Override
26    public void registerObserver(ContentObserver observer) {
27        super.registerObserver(observer);
28    }
29
30    /**
31     * invokes dispatchUpdate on each observer, unless the observer doesn't want
32     * self-notifications and the update is from a self-notification
33     * @param selfChange
34     */
35    public void dispatchChange(boolean selfChange) {
36        synchronized(mObservers) {
37            for (ContentObserver observer : mObservers) {
38                if (!selfChange || observer.deliverSelfNotifications()) {
39                    observer.dispatchChange(selfChange);
40                }
41            }
42        }
43    }
44
45    /**
46     * invokes onChange on each observer
47     * @param selfChange
48     */
49    public void notifyChange(boolean selfChange) {
50        synchronized(mObservers) {
51            for (ContentObserver observer : mObservers) {
52                observer.onChange(selfChange);
53            }
54        }
55    }
56}
57