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      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 
     31     RendererHandler(Looper looper, T renderer) {
     32         super(looper);
     33         mRendererRef = new WeakReference<>(renderer);
     34     }
     35 
     36     @Override
     37     public void handleMessage(Message msg) {
     38         T renderer = mRendererRef.get();
     39         if (renderer != null) {
     40             handleMessage(msg, renderer);
     41         }
     42     }
     43 
     44     public abstract void handleMessage(Message msg, T renderer);
     45 }
     46