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      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 
     18 package com.android.mms.model;
     19 
     20 import java.util.concurrent.CopyOnWriteArrayList;
     21 
     22 public 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