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AndroidCompat/src/main/java/android/database/ContentObservable.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;
+
+import android.net.Uri;
+
+/**
+ * A specialization of {@link Observable} for {@link ContentObserver}
+ * that provides methods for sending notifications to a list of
+ * {@link ContentObserver} objects.
+ */
+public class ContentObservable extends Observable<ContentObserver> {
+    // Even though the generic method defined in Observable would be perfectly
+    // fine on its own, we can't delete this overridden method because it would
+    // potentially break binary compatibility with existing applications.
+    @Override
+    public void registerObserver(ContentObserver observer) {
+        super.registerObserver(observer);
+    }
+
+    /**
+     * Invokes {@link ContentObserver#dispatchChange(boolean)} on each observer.
+     * <p>
+     * If <code>selfChange</code> is true, only delivers the notification
+     * to the observer if it has indicated that it wants to receive self-change
+     * notifications by implementing {@link ContentObserver#deliverSelfNotifications}
+     * to return true.
+     * </p>
+     *
+     * @param selfChange True if this is a self-change notification.
+     *
+     * @deprecated Use {@link #dispatchChange(boolean, Uri)} instead.
+     */
+    @Deprecated
+    public void dispatchChange(boolean selfChange) {
+        dispatchChange(selfChange, null);
+    }
+
+    /**
+     * Invokes {@link ContentObserver#dispatchChange(boolean, Uri)} on each observer.
+     * Includes the changed content Uri when available.
+     * <p>
+     * If <code>selfChange</code> is true, only delivers the notification
+     * to the observer if it has indicated that it wants to receive self-change
+     * notifications by implementing {@link ContentObserver#deliverSelfNotifications}
+     * to return true.
+     * </p>
+     *
+     * @param selfChange True if this is a self-change notification.
+     * @param uri The Uri of the changed content, or null if unknown.
+     */
+    public void dispatchChange(boolean selfChange, Uri uri) {
+        synchronized(mObservers) {
+            for (ContentObserver observer : mObservers) {
+                if (!selfChange || observer.deliverSelfNotifications()) {
+                    observer.dispatchChange(selfChange, uri);
+                }
+            }
+        }
+    }
+
+    /**
+     * Invokes {@link ContentObserver#onChange} on each observer.
+     *
+     * @param selfChange True if this is a self-change notification.
+     *
+     * @deprecated Use {@link #dispatchChange} instead.
+     */
+    @Deprecated
+    public void notifyChange(boolean selfChange) {
+        synchronized(mObservers) {
+            for (ContentObserver observer : mObservers) {
+                observer.onChange(selfChange, null);
+            }
+        }
+    }
+}