1 /*
2  * Copyright (C) 2014 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.tv.settings.widget;
18 
19 public class RefcountObject<T> {
20 
21     public static interface RefcountListener {
onRefcountZero(RefcountObject<?> object)22         public void onRefcountZero(RefcountObject<?> object);
23     }
24 
25     private RefcountObject.RefcountListener mRefcountListener;
26     private int mRefcount;
27     private final T mObject;
28 
RefcountObject(T object)29     public RefcountObject(T object) {
30         mObject = object;
31     }
32 
setRefcountListener(RefcountObject.RefcountListener listener)33     public void setRefcountListener(RefcountObject.RefcountListener listener) {
34         mRefcountListener = listener;
35     }
36 
addRef()37     public synchronized int addRef() {
38         mRefcount++;
39         return mRefcount;
40     }
41 
releaseRef()42     public synchronized int releaseRef() {
43         mRefcount--;
44         if (mRefcount == 0 && mRefcountListener != null) {
45             mRefcountListener.onRefcountZero(this);
46         }
47         return mRefcount;
48     }
49 
getRef()50     public synchronized int getRef() {
51         return mRefcount;
52     }
53 
getObject()54     public T getObject() {
55         return mObject;
56     }
57 }
58