org.eclipse.emf.refactor.refactoring.runtime/src/org/eclipse/emf/refactor/refactoring/runtime/ltk/command/PreviewCommand.java

/*******************************************************************************
 * Copyright (c) Philipps University of Marburg. All rights reserved. 
 * This program and the accompanying materials are made 
 * available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Philipps University of Marburg - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.refactor.refactoring.runtime.ltk.command;

import org.eclipse.emf.common.command.AbstractCommand;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.util.EcoreUtil;

/**
 * Class used for providing a command that provides
 * a preview of the rfactored EMF model.
 * @generated NOT
 * @author Florian Mantz
 */
public class PreviewCommand extends AbstractCommand {
	
	/**
	 * Command that was the origin of the PreviewCommand.
	 */
	final RefactoringCommand command;
	
	/**
	 * Root element of the EMF model.
	 */
	private final EObject root;	
	
	/**
	 * Copy of the root element of the model (temporary model).
	 */
	private EObject rootCopy;
	
	/**
	 * Default constructor using the origin RefactoringCommand and
	 * the root of the EMF model. 
	 * @param command Origin RefactoringCommand.
	 * @param root Root element of the EMF model.
	 */
	public PreviewCommand(RefactoringCommand command, EObject root) {
		super();
		this.command = command;
		this.root = root;
	}

	/**
	 * @see org.eclipse.emf.common.command.Command#execute()
	 */
	@Override
	public void execute() {
		this.command.execute();		
		rootCopy = this.generateRootCopy();
		this.command.undo();
	}
	
	/**
	 * Generates a copy of the EMF model presented by the root
	 * element.
	 * @return Copy of the EMF model presented by the root
	 * element.
	 */
	private EObject generateRootCopy() {
//		Copier copier = new Copier();
		return EcoreUtil.copy(this.root);
//		EObject rootCopy =  copier.copy(this.root);
//		copier.copyReferences();
//		return rootCopy;
	}

	/**
	 * @see org.eclipse.emf.common.command.Command#redo()
	 */
	@Override
	public void redo() {
		//do nothing
	}

	/**
	 * @see org.eclipse.emf.common.command.AbstractCommand#canExecute()
	 */
	@Override
	public boolean canExecute() {
		return true;
	}

	/**
	 * @see org.eclipse.emf.common.command.AbstractCommand#canUndo()
	 */
	@Override
	public boolean canUndo() {
		return false; //Important
	}
	
	/**
	 * Gets a copy of the root element of the model (temporary model).
	 * @return Copy of the root element of the model (temporary model).
	 */
	public EObject getRootCopy() {
		return rootCopy;
	}

}