/* 
 * Copyright (c) 2006 Stiftung Deutsches Elektronen-Synchroton, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.ui.internal.commands;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.csstudio.sds.model.AbstractWidgetModel;
import org.csstudio.sds.model.GuideModel;
import org.csstudio.sds.model.RulerModel;
import org.eclipse.gef.commands.Command;

/**
 * A Command to delete a guide.
 * @author Kai Meyer
 */
public final class DeleteGuideCommand extends Command {

	/**
	 * The RulerModel.
	 */
	private RulerModel _parent;
	/**
	 * The GuideModel.
	 */
	private GuideModel _guide;
	/**
	 * A Map of {@link AbstractWidgetModel} and Integers.
	 */
	private Map<AbstractWidgetModel, Integer> _oldParts;
	
	/**
	 * Constructor.
	 * @param guide
	 * 			The GuideModel
	 * @param parent
	 * 			The RulerModel
	 */
	public DeleteGuideCommand(final GuideModel guide, final RulerModel parent) {
		_guide = guide;
		_parent = parent;
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void execute() {
		_oldParts = new HashMap<AbstractWidgetModel, Integer>(_guide.getMap());
		Iterator<AbstractWidgetModel> iter = _oldParts.keySet().iterator();
		while (iter.hasNext()) {
			_guide.detachPart(iter.next());
		}
		_parent.removeGuide(_guide);
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void undo() {
		_parent.addGuide(_guide);
		Iterator<AbstractWidgetModel> iter = _oldParts.keySet().iterator();
		while (iter.hasNext()) {
			AbstractWidgetModel model = iter.next();
			_guide.attachPart(model, ((Integer)_oldParts.get(model)).intValue());
		}
	}
}