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      1 /*
      2  * Copyright (C) 2015 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 package android.databinding;
     17 
     18 import android.support.v4.util.ArrayMap;
     19 
     20 import java.util.Collection;
     21 
     22 public class ObservableArrayMap<K, V> extends ArrayMap<K, V> implements ObservableMap<K, V> {
     23 
     24     private transient MapChangeRegistry mListeners;
     25 
     26     @Override
     27     public void addOnMapChangedCallback(
     28             OnMapChangedCallback<? extends ObservableMap<K, V>, K, V> listener) {
     29         if (mListeners == null) {
     30             mListeners = new MapChangeRegistry();
     31         }
     32         mListeners.add(listener);
     33     }
     34 
     35     @Override
     36     public void removeOnMapChangedCallback(
     37             OnMapChangedCallback<? extends ObservableMap<K, V>, K, V> listener) {
     38         if (mListeners != null) {
     39             mListeners.remove(listener);
     40         }
     41     }
     42 
     43     @Override
     44     public void clear() {
     45         boolean wasEmpty = isEmpty();
     46         if (!wasEmpty) {
     47             super.clear();
     48             notifyChange(null);
     49         }
     50     }
     51 
     52     public V put(K k, V v) {
     53         V val = super.put(k, v);
     54         notifyChange(k);
     55         return v;
     56     }
     57 
     58     @Override
     59     public boolean removeAll(Collection<?> collection) {
     60         boolean removed = false;
     61         for (Object key : collection) {
     62             int index = indexOfKey(key);
     63             if (index >= 0) {
     64                 removed = true;
     65                 removeAt(index);
     66             }
     67         }
     68         return removed;
     69     }
     70 
     71     @Override
     72     public boolean retainAll(Collection<?> collection) {
     73         boolean removed = false;
     74         for (int i = size() - 1; i >= 0; i--) {
     75             Object key = keyAt(i);
     76             if (!collection.contains(key)) {
     77                 removeAt(i);
     78                 removed = true;
     79             }
     80         }
     81         return removed;
     82     }
     83 
     84     @Override
     85     public V removeAt(int index) {
     86         K key = keyAt(index);
     87         V value = super.removeAt(index);
     88         if (value != null) {
     89             notifyChange(key);
     90         }
     91         return value;
     92     }
     93 
     94     @Override
     95     public V setValueAt(int index, V value) {
     96         K key = keyAt(index);
     97         V oldValue = super.setValueAt(index, value);
     98         notifyChange(key);
     99         return oldValue;
    100     }
    101 
    102     private void notifyChange(Object key) {
    103         if (mListeners != null) {
    104             mListeners.notifyCallbacks(this, 0, key);
    105         }
    106     }
    107 }
    108