Initial Contribution

1 files changed, 47 insertions, 0 deletions

diff --git a/core/java/android/database/DataSetObservable.java b/core/java/android/database/DataSetObservable.java
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+++ b/core/java/android/database/DataSetObservable.java
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+/*
+ * 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;
+
+/**
+ * A specialization of Observable for DataSetObserver that provides methods for
+ * invoking the various callback methods of DataSetObserver.
+ */
+public class DataSetObservable extends Observable<DataSetObserver> {
+    /**
+     * Invokes onChanged on each observer. Called when the data set being observed has
+     * changed, and which when read contains the new state of the data.
+     */
+    public void notifyChanged() {
+        synchronized(mObservers) {
+            for (DataSetObserver observer : mObservers) {
+                observer.onChanged();
+            }
+        }
+    }
+
+    /**
+     * Invokes onInvalidated on each observer. Called when the data set being monitored
+     * has changed such that it is no longer valid.
+     */
+    public void notifyInvalidated() {
+        synchronized (mObservers) {
+            for (DataSetObserver observer : mObservers) {
+                observer.onInvalidated();
+            }
+        }
+    }
+}