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author | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:45 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-03-03 18:28:45 -0800 |
commit | d83a98f4ce9cfa908f5c54bbd70f03eec07e7553 (patch) | |
tree | 4b825dc642cb6eb9a060e54bf8d69288fbee4904 /core/java/android/database/Observable.java | |
parent | 076357b8567458d4b6dfdcf839ef751634cd2bfb (diff) | |
download | frameworks_base-d83a98f4ce9cfa908f5c54bbd70f03eec07e7553.zip frameworks_base-d83a98f4ce9cfa908f5c54bbd70f03eec07e7553.tar.gz frameworks_base-d83a98f4ce9cfa908f5c54bbd70f03eec07e7553.tar.bz2 |
auto import from //depot/cupcake/@135843
Diffstat (limited to 'core/java/android/database/Observable.java')
-rw-r--r-- | core/java/android/database/Observable.java | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/core/java/android/database/Observable.java b/core/java/android/database/Observable.java deleted file mode 100644 index b6fecab..0000000 --- a/core/java/android/database/Observable.java +++ /dev/null @@ -1,78 +0,0 @@ -/* - * Copyright (C) 2007 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -package android.database; - -import java.util.ArrayList; - -/** - * Provides methods for (un)registering arbitrary observers in an ArrayList. - */ -public abstract class Observable<T> { - /** - * The list of observers. An observer can be in the list at most - * once and will never be null. - */ - protected final ArrayList<T> mObservers = new ArrayList<T>(); - - /** - * Adds an observer to the list. The observer cannot be null and it must not already - * be registered. - * @param observer the observer to register - * @throws IllegalArgumentException the observer is null - * @throws IllegalStateException the observer is already registered - */ - public void registerObserver(T observer) { - if (observer == null) { - throw new IllegalArgumentException("The observer is null."); - } - synchronized(mObservers) { - if (mObservers.contains(observer)) { - throw new IllegalStateException("Observer " + observer + " is already registered."); - } - mObservers.add(observer); - } - } - - /** - * Removes a previously registered observer. The observer must not be null and it - * must already have been registered. - * @param observer the observer to unregister - * @throws IllegalArgumentException the observer is null - * @throws IllegalStateException the observer is not yet registered - */ - public void unregisterObserver(T observer) { - if (observer == null) { - throw new IllegalArgumentException("The observer is null."); - } - synchronized(mObservers) { - int index = mObservers.indexOf(observer); - if (index == -1) { - throw new IllegalStateException("Observer " + observer + " was not registered."); - } - mObservers.remove(index); - } - } - - /** - * Remove all registered observer - */ - public void unregisterAll() { - synchronized(mObservers) { - mObservers.clear(); - } - } -} |