/* * Copyright (C) 2016 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.car.cluster.renderer; import android.os.Handler; import android.os.Looper; import android.os.Message; import java.lang.ref.WeakReference; /** * Abstract {@link Handler} class that holds reference to a renderer object. */ public abstract class RendererHandler extends Handler { private final WeakReference mRendererRef; RendererHandler(Looper looper, T renderer) { super(looper); mRendererRef = new WeakReference<>(renderer); } @Override public void handleMessage(Message msg) { T renderer = mRendererRef.get(); if (renderer != null) { handleMessage(msg, renderer); } } public abstract void handleMessage(Message msg, T renderer); }