/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.ex.camera2.portability;
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import android.os.Handler;
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import android.os.Looper;
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import android.os.Message;
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import java.util.LinkedList;
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class HistoryHandler extends Handler {
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private static final int MAX_HISTORY_SIZE = 400;
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final LinkedList<Integer> mMsgHistory;
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HistoryHandler(Looper looper) {
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super(looper);
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mMsgHistory = new LinkedList<Integer>();
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// We add a -1 at the beginning to mark the very beginning of the
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// history.
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mMsgHistory.offerLast(-1);
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}
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Integer getCurrentMessage() {
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return mMsgHistory.peekLast();
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}
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String generateHistoryString(int cameraId) {
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String info = new String("HIST");
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info += "_ID" + cameraId;
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for (Integer msg : mMsgHistory) {
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info = info + '_' + msg.toString();
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}
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info += "_HEND";
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return info;
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}
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/**
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* Subclasses' implementations should call this one before doing their work.
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*/
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@Override
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public void handleMessage(Message msg) {
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mMsgHistory.offerLast(msg.what);
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while (mMsgHistory.size() > MAX_HISTORY_SIZE) {
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mMsgHistory.pollFirst();
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}
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}
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}
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