19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.database; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 2086de0590b94bcce27e3038c27464bed510bb564aJeff Brown * A specialization of {@link Observable} for {@link DataSetObserver} 2186de0590b94bcce27e3038c27464bed510bb564aJeff Brown * that provides methods for sending notifications to a list of 2286de0590b94bcce27e3038c27464bed510bb564aJeff Brown * {@link DataSetObserver} objects. 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class DataSetObservable extends Observable<DataSetObserver> { 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2686de0590b94bcce27e3038c27464bed510bb564aJeff Brown * Invokes {@link DataSetObserver#onChanged} on each observer. 2786de0590b94bcce27e3038c27464bed510bb564aJeff Brown * Called when the contents of the data set have changed. The recipient 2886de0590b94bcce27e3038c27464bed510bb564aJeff Brown * will obtain the new contents the next time it queries the data set. 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void notifyChanged() { 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized(mObservers) { 3220f549fd2f40db524242c9038d7d63356adf95fcVasu Nori // since onChanged() is implemented by the app, it could do anything, including 3320f549fd2f40db524242c9038d7d63356adf95fcVasu Nori // removing itself from {@link mObservers} - and that could cause problems if 3420f549fd2f40db524242c9038d7d63356adf95fcVasu Nori // an iterator is used on the ArrayList {@link mObservers}. 3520f549fd2f40db524242c9038d7d63356adf95fcVasu Nori // to avoid such problems, just march thru the list in the reverse order. 3620f549fd2f40db524242c9038d7d63356adf95fcVasu Nori for (int i = mObservers.size() - 1; i >= 0; i--) { 3720f549fd2f40db524242c9038d7d63356adf95fcVasu Nori mObservers.get(i).onChanged(); 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 4386de0590b94bcce27e3038c27464bed510bb564aJeff Brown * Invokes {@link DataSetObserver#onInvalidated} on each observer. 4486de0590b94bcce27e3038c27464bed510bb564aJeff Brown * Called when the data set is no longer valid and cannot be queried again, 4586de0590b94bcce27e3038c27464bed510bb564aJeff Brown * such as when the data set has been closed. 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void notifyInvalidated() { 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized (mObservers) { 4920f549fd2f40db524242c9038d7d63356adf95fcVasu Nori for (int i = mObservers.size() - 1; i >= 0; i--) { 5020f549fd2f40db524242c9038d7d63356adf95fcVasu Nori mObservers.get(i).onInvalidated(); 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 55