73 lines
2.1 KiB
Java
73 lines
2.1 KiB
Java
/*
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* Copyright (C) 2012 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.inputmethod.research;
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import java.util.LinkedList;
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/**
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* Maintain a FIFO queue of LogUnits.
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*
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* This class provides an unbounded queue. This is useful when the user is aware that their actions
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* are being recorded, such as when they are trying to reproduce a bug. In this case, there should
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* not be artificial restrictions on how many events that can be saved.
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*/
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public class LogBuffer {
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// TODO: Gracefully handle situations in which this LogBuffer is consuming too much memory.
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// This may happen, for example, if the user has forgotten that data is being logged.
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private final LinkedList<LogUnit> mLogUnits;
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public LogBuffer() {
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mLogUnits = new LinkedList<LogUnit>();
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}
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protected LinkedList<LogUnit> getLogUnits() {
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return mLogUnits;
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}
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public void clear() {
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mLogUnits.clear();
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}
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public void shiftIn(final LogUnit logUnit) {
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mLogUnits.add(logUnit);
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}
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public LogUnit unshiftIn() {
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if (mLogUnits.isEmpty()) {
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return null;
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}
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return mLogUnits.removeLast();
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}
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public LogUnit peekLastLogUnit() {
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if (mLogUnits.isEmpty()) {
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return null;
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}
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return mLogUnits.peekLast();
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}
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public boolean isEmpty() {
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return mLogUnits.isEmpty();
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}
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public LogUnit shiftOut() {
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if (isEmpty()) {
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return null;
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}
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return mLogUnits.removeFirst();
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}
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}
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