1 /*
2  * Copyright (C) 2016 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 com.android.car.cluster.renderer;
17 
18 import android.os.Handler;
19 import android.os.Looper;
20 import android.os.Message;
21 
22 import java.lang.ref.WeakReference;
23 
24 /**
25  * Abstract {@link Handler} class that holds reference to a renderer object.
26  */
27 public abstract class RendererHandler<T> extends Handler {
28 
29     private final WeakReference<T> mRendererRef;
30 
RendererHandler(Looper looper, T renderer)31     RendererHandler(Looper looper, T renderer) {
32         super(looper);
33         mRendererRef = new WeakReference<>(renderer);
34     }
35 
36     @Override
handleMessage(Message msg)37     public void handleMessage(Message msg) {
38         T renderer = mRendererRef.get();
39         if (renderer != null) {
40             handleMessage(msg, renderer);
41         }
42     }
43 
handleMessage(Message msg, T renderer)44     public abstract void handleMessage(Message msg, T renderer);
45 }
46