/*
* Copyright (C) 2015-2017 PÂRIS Quentin
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.phoenicis.javafx.views.mainwindow.console;
import java.util.ArrayList;
import java.util.List;
/**
* Small helper intended for keeping track of commands that have been entered into the console window.
*/
class CommandHistory {
private final List<Item> history = new ArrayList<>();
private int historyPosition = 0;
public void add(Item item) {
this.history.add(item);
historyPosition = this.history.size();
}
Item up() {
if (historyPosition > 0) {
historyPosition--;
}
return current();
}
Item down() {
historyPosition = historyPosition < history.size() ? historyPosition + 1 : history.size();
return current();
}
private Item current() {
if (!history.isEmpty() && historyPosition < history.size()) {
return history.get(historyPosition);
}
return Item.EMPTY;
}
static final class Item {
static final Item EMPTY = new Item("", 0);
private final String command;
private final int cursorPosition;
Item(String command, int cursorPosition) {
this.command = command;
this.cursorPosition = cursorPosition;
}
String getCommand() {
return command;
}
int getCursorPosition() {
return cursorPosition;
}
}
}