97 lines
2.0 KiB
Java
97 lines
2.0 KiB
Java
/*
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Yaaic - Yet Another Android IRC Client
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Copyright 2009-2012 Sebastian Kaspari
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This file is part of Yaaic.
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Yaaic is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Yaaic is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Yaaic. If not, see <http://www.gnu.org/licenses/>.
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*/
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package org.yaaic.model;
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import java.util.LinkedList;
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/**
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* Class for handling the scrollback history
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*
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* @author Sebastian Kaspari <sebastian@yaaic.org>
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*/
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public class Scrollback
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{
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public static final int MAX_HISTORY = 10;
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private final LinkedList<String> messages;
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private int pointer;
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/**
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* Create a new scrollback object
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*/
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public Scrollback()
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{
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messages = new LinkedList<String>();
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}
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/**
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* Add a message to the history
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*/
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public void addMessage(String message)
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{
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messages.addLast(message);
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if (messages.size() > MAX_HISTORY) {
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messages.removeFirst();
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}
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pointer = messages.size();
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}
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/**
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* Go back in history
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*
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* @return
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*/
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public String goBack()
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{
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if (pointer > 0) {
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pointer--;
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}
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if (messages.size() > 0) {
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return messages.get(pointer);
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}
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return null;
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}
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/**
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* Go forward in history
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*
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* @return
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*/
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public String goForward()
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{
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if (pointer < messages.size() - 1) {
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pointer++;
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} else {
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return "";
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}
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if (messages.size() > 0) {
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return messages.get(pointer);
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}
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return null;
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}
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}
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