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 /** 20 * A specialization of Observable for DataSetObserver that provides methods for 21 * invoking the various callback methods of DataSetObserver. 22 */ 23 public class DataSetObservable extends Observable<DataSetObserver> { 24 /** 25 * Invokes onChanged on each observer. Called when the data set being observed has 26 * changed, and which when read contains the new state of the data. 27 */ 28 public void notifyChanged() { 29 synchronized(mObservers) { 30 for (DataSetObserver observer : mObservers) { 31 observer.onChanged(); 32 } 33 } 34 } 35 36 /** 37 * Invokes onInvalidated on each observer. Called when the data set being monitored 38 * has changed such that it is no longer valid. 39 */ 40 public void notifyInvalidated() { 41 synchronized (mObservers) { 42 for (DataSetObserver observer : mObservers) { 43 observer.onInvalidated(); 44 } 45 } 46 } 47 } 48
