/*
* Freeplane - mind map editor
* Copyright (C) 2009 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.features.filter;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import org.freeplane.features.map.MapModel;
import org.freeplane.features.mode.Controller;
/**
* @author Dimitry Polivaev
* Mar 30, 2009
*/
public class FilterHistory {
// // private final Controller controller;
private ListIterator<Filter> filters;
FilterHistory() {
// this.controller = controller;
init();
}
void add(final Filter filter) {
final Filter currentFilter = getCurrentFilter();
if (isConditionStronger(currentFilter, filter)) {
filters.previous();
filters.remove();
}
while (filters.hasNext()) {
filters.next();
filters.remove();
}
filters.add(filter);
}
void clear() {
init();
}
Filter getCurrentFilter() {
filters.previous();
return filters.next();
}
private void init() {
final List<Filter> list = new LinkedList<Filter>();
filters = list.listIterator();
filters.add(Filter.createTransparentFilter());
}
private boolean isConditionStronger(final Filter oldFilter, final Filter newFilter) {
return newFilter.isConditionStronger(oldFilter);
}
void redo() {
if (!filters.hasNext()) {
return;
}
Controller controller = Controller.getCurrentController();
final MapModel map = controller.getMap();
final Filter next = filters.next();
next.applyFilter(this, map, true);
}
void undo() {
Controller controller = Controller.getCurrentController();
final MapModel map = controller.getMap();
final Filter previous = filters.previous();
undoImpl(map);
while (previous != filters.next()) {
;
}
if (filters.nextIndex() > 1) {
filters.previous();
}
}
private void undoImpl( final MapModel map) {
if (!filters.hasPrevious()) {
return;
}
final Filter previous = filters.previous();
if (previous.appliesToVisibleNodesOnly()) {
undoImpl(map);
}
previous.applyFilter(this, map, true);
}
}