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 17 package android.database; 18 19 import android.net.Uri; 20 21 /** 22 * A specialization of {@link Observable} for {@link ContentObserver} 23 * that provides methods for sending notifications to a list of 24 * {@link ContentObserver} objects. 25 */ 26 public class ContentObservable extends Observable<ContentObserver> { 27 // Even though the generic method defined in Observable would be perfectly 28 // fine on its own, we can't delete this overridden method because it would 29 // potentially break binary compatibility with existing applications. 30 @Override 31 public void registerObserver(ContentObserver observer) { 32 super.registerObserver(observer); 33 } 34 35 /** 36 * Invokes {@link ContentObserver#dispatchChange(boolean)} on each observer. 37 * <p> 38 * If <code>selfChange</code> is true, only delivers the notification 39 * to the observer if it has indicated that it wants to receive self-change 40 * notifications by implementing {@link ContentObserver#deliverSelfNotifications} 41 * to return true. 42 * </p> 43 * 44 * @param selfChange True if this is a self-change notification. 45 * 46 * @deprecated Use {@link #dispatchChange(boolean, Uri)} instead. 47 */ 48 @Deprecated 49 public void dispatchChange(boolean selfChange) { 50 dispatchChange(selfChange, null); 51 } 52 53 /** 54 * Invokes {@link ContentObserver#dispatchChange(boolean, Uri)} on each observer. 55 * Includes the changed content Uri when available. 56 * <p> 57 * If <code>selfChange</code> is true, only delivers the notification 58 * to the observer if it has indicated that it wants to receive self-change 59 * notifications by implementing {@link ContentObserver#deliverSelfNotifications} 60 * to return true. 61 * </p> 62 * 63 * @param selfChange True if this is a self-change notification. 64 * @param uri The Uri of the changed content, or null if unknown. 65 */ 66 public void dispatchChange(boolean selfChange, Uri uri) { 67 synchronized(mObservers) { 68 for (ContentObserver observer : mObservers) { 69 if (!selfChange || observer.deliverSelfNotifications()) { 70 observer.dispatchChange(selfChange, uri); 71 } 72 } 73 } 74 } 75 76 /** 77 * Invokes {@link ContentObserver#onChange} on each observer. 78 * 79 * @param selfChange True if this is a self-change notification. 80 * 81 * @deprecated Use {@link #dispatchChange} instead. 82 */ 83 @Deprecated 84 public void notifyChange(boolean selfChange) { 85 synchronized(mObservers) { 86 for (ContentObserver observer : mObservers) { 87 observer.onChange(selfChange, null); 88 } 89 } 90 } 91 } 92
