1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.gallery3d.data; 18 19 import com.android.gallery3d.app.GalleryApp; 20 21 import android.net.Uri; 22 23 import java.util.concurrent.atomic.AtomicBoolean; 24 25 // This handles change notification for media sets. 26 public class ChangeNotifier { 27 28 private MediaSet mMediaSet; 29 private AtomicBoolean mContentDirty = new AtomicBoolean(true); 30 31 public ChangeNotifier(MediaSet set, Uri uri, GalleryApp application) { 32 mMediaSet = set; 33 application.getDataManager().registerChangeNotifier(uri, this); 34 } 35 36 // Returns the dirty flag and clear it. 37 public boolean isDirty() { 38 return mContentDirty.compareAndSet(true, false); 39 } 40 41 public void fakeChange() { 42 onChange(false); 43 } 44 45 public void clearDirty() { 46 mContentDirty.set(false); 47 } 48 49 protected void onChange(boolean selfChange) { 50 if (mContentDirty.compareAndSet(false, true)) { 51 mMediaSet.notifyContentChanged(); 52 } 53 } 54 }
