1 files changed, 57 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/data/ChangeNotifier.java b/src/com/android/gallery3d/data/ChangeNotifier.java
new file mode 100644
index 000000000..558a8648e
--- /dev/null
+++ b/src/com/android/gallery3d/data/ChangeNotifier.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2010 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 com.android.gallery3d.data;
+
+import android.net.Uri;
+
+import com.android.gallery3d.app.GalleryApp;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+// This handles change notification for media sets.
+public class ChangeNotifier {
+
+    private MediaSet mMediaSet;
+    private AtomicBoolean mContentDirty = new AtomicBoolean(true);
+
+    public ChangeNotifier(MediaSet set, Uri uri, GalleryApp application) {
+        mMediaSet = set;
+        application.getDataManager().registerChangeNotifier(uri, this);
+    }
+
+    public ChangeNotifier(MediaSet set, Uri[] uris, GalleryApp application) {
+        mMediaSet = set;
+        for (int i = 0; i < uris.length; i++) {
+            application.getDataManager().registerChangeNotifier(uris[i], this);
+        }
+    }
+
+    // Returns the dirty flag and clear it.
+    public boolean isDirty() {
+        return mContentDirty.compareAndSet(true, false);
+    }
+
+    public void fakeChange() {
+        onChange(false);
+    }
+
+    protected void onChange(boolean selfChange) {
+        if (mContentDirty.compareAndSet(false, true)) {
+            mMediaSet.notifyContentChanged();
+        }
+    }
+}
+\ No newline at end of file