1/*
2 * Copyright (C) 2008 Esmertec AG.
3 * Copyright (C) 2008 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18package com.android.mms.model;
19
20import java.util.concurrent.CopyOnWriteArrayList;
21
22public class Model {
23    protected CopyOnWriteArrayList<IModelChangedObserver> mModelChangedObservers =
24            new CopyOnWriteArrayList<IModelChangedObserver>();
25
26    public void registerModelChangedObserver(IModelChangedObserver observer) {
27        if (!mModelChangedObservers.contains(observer)) {
28            mModelChangedObservers.add(observer);
29            registerModelChangedObserverInDescendants(observer);
30        }
31    }
32
33    public void unregisterModelChangedObserver(IModelChangedObserver observer) {
34        mModelChangedObservers.remove(observer);
35        unregisterModelChangedObserverInDescendants(observer);
36    }
37
38    public void unregisterAllModelChangedObservers() {
39        unregisterAllModelChangedObserversInDescendants();
40        mModelChangedObservers.clear();
41    }
42
43    protected void notifyModelChanged(boolean dataChanged) {
44        for (IModelChangedObserver observer : mModelChangedObservers) {
45            observer.onModelChanged(this, dataChanged);
46        }
47    }
48
49    protected void registerModelChangedObserverInDescendants(
50            IModelChangedObserver observer) {
51        // Dummy method.
52    }
53
54    protected void unregisterModelChangedObserverInDescendants(
55            IModelChangedObserver observer) {
56        // Dummy method.
57    }
58
59    protected void unregisterAllModelChangedObserversInDescendants() {
60        // Dummy method.
61    }
62}
63