/*
* Freeplane - mind map editor
* Copyright (C) 2008 Dimitry Polivaev
*
* This file author is Dimitry Polivaev
*
* 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, see <http://www.gnu.org/licenses/>.
*/
package org.freeplane.core.undo;
import java.util.LinkedList;
import java.util.ListIterator;
/**
* Contains a list of actors and applys act() and undo() in a batch operation.
*
* Implements composite design pattern.
*
* @author Robert Ladstaetter
*/
public class CompoundActor implements IActor {
final private LinkedList<IActor> actors;
public CompoundActor() {
this(new LinkedList<IActor>());
}
public CompoundActor(final LinkedList<IActor> actors) {
this.actors = actors;
}
public void act() {
for (final IActor a : actors) {
a.act();
}
}
public void add(final IActor firstActor) {
actors.add(firstActor);
}
public String getDescription() {
if (actors.size() == 0) {
return "";
}
final String firstDescription = actors.getFirst().getDescription();
if (actors.size() == 1) {
return firstDescription;
}
final String lastDescription = actors.getLast().getDescription();
if (actors.size() == 2 && !firstDescription.equals("") && !lastDescription.equals("")) {
return firstDescription + ", " + lastDescription;
}
return firstDescription + "... " + lastDescription;
}
public void undo() {
final ListIterator<IActor> iterator = actors.listIterator(actors.size());
while (iterator.hasPrevious()) {
iterator.previous().undo();
}
}
public boolean isEmpty() {
return actors.size() == 0;
}
}