MapLayerEdit.java

/*
 *  Tiled Map Editor, (c) 2004-2006
 *
 *  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.
 * 
 *  Adam Turk <aturk@biggeruniverse.com>
 *  Bjorn Lindeijer <bjorn@lindeijer.nl>
 */

package tiled.mapeditor.undo;

import javax.swing.undo.AbstractUndoableEdit;
import javax.swing.undo.CannotRedoException;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoableEdit;

import tiled.core.MapLayer;

/**
 * @version $Id$
 */
public class MapLayerEdit extends AbstractUndoableEdit
{
    /**
	 * 
	 */
	private static final long serialVersionUID = 3492616195184646597L;
	private final MapLayer editedLayer;
    private MapLayer layerUndo, layerRedo;
    private String name;
    private boolean inProgress;

    public MapLayerEdit(MapLayer layer) {
        editedLayer = layer;
    }

    public MapLayerEdit(MapLayer layer, MapLayer before) {
        this(layer);
        start(before);
    }

    public MapLayerEdit(MapLayer layer, MapLayer before, MapLayer after) {
        this(layer, before);
        end(after);
    }

    public void start(MapLayer fml) {
        layerUndo = fml;
        inProgress = true;
    }

    public void end(MapLayer fml) {
        if (!inProgress) {
            new Exception("end called before start").printStackTrace();
        }
        if (fml != null) {
            layerRedo = fml;
            inProgress = false;
        }
    }

    public MapLayer getStart() {
        return layerUndo;
    }

    /* inherited methods */
    @Override
	public void undo() throws CannotUndoException {
        if (editedLayer == null) {
            throw new CannotUndoException();
        }
        layerUndo.copyTo(editedLayer);
    }

    @Override
	public boolean canUndo() {
        return layerUndo != null && editedLayer != null;
    }

    @Override
	public void redo() throws CannotRedoException {
        if (editedLayer == null) {
            throw new CannotRedoException();
        }
        layerRedo.copyTo(editedLayer);
    }

    @Override
	public boolean canRedo() {
        return layerRedo != null && editedLayer != null;
    }

    @Override
	public void die() {
        layerUndo = null;
        layerRedo = null;
        inProgress = false;
    }

    @Override
	public boolean addEdit(UndoableEdit anEdit) {
        if (inProgress && anEdit.getClass() == getClass()) {
            //TODO: absorb the edit
            //return true;
        }
        return false;
    }

    public void setPresentationName(String s) {
        name = s;
    }

    @Override
	public String getPresentationName() {
        return name;
    }
}