| /* |
| * 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.server.accessibility; |
| |
| import android.os.Handler; |
| import android.os.Message; |
| import android.util.Pair; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * Utility class to capture messages dispatched through a handler and control when they arrive |
| * at their target. |
| */ |
| public class MessageCapturingHandler extends Handler { |
| List<Pair<Message, Long>> timedMessages = new ArrayList<>(); |
| |
| Handler.Callback mCallback; |
| |
| public MessageCapturingHandler(Handler.Callback callback) { |
| mCallback = callback; |
| } |
| |
| @Override |
| public boolean sendMessageAtTime(Message message, long uptimeMillis) { |
| timedMessages.add(new Pair<>(Message.obtain(message), uptimeMillis)); |
| return super.sendMessageAtTime(message, uptimeMillis); |
| } |
| |
| public void setCallback(Handler.Callback callback) { |
| mCallback = callback; |
| } |
| |
| public void sendOneMessage() { |
| Message message = timedMessages.remove(0).first; |
| removeMessages(message.what, message.obj); |
| mCallback.handleMessage(message); |
| removeStaleMessages(); |
| } |
| |
| public void sendAllMessages() { |
| while (!timedMessages.isEmpty()) { |
| sendOneMessage(); |
| } |
| } |
| |
| public void sendLastMessage() { |
| Message message = timedMessages.remove(timedMessages.size() - 1).first; |
| removeMessages(message.what, message.obj); |
| mCallback.handleMessage(message); |
| removeStaleMessages(); |
| } |
| |
| public boolean hasMessages() { |
| removeStaleMessages(); |
| return !timedMessages.isEmpty(); |
| } |
| |
| private void removeStaleMessages() { |
| for (int i = 0; i < timedMessages.size(); i++) { |
| Message message = timedMessages.get(i).first; |
| if (!hasMessages(message.what, message.obj)) { |
| timedMessages.remove(i--); |
| } |
| } |
| } |
| } |