RootComponentEditPolicy.java

/*******************************************************************************
 * Copyright (c) 2000, 2010, 2012 IBM Corporation, Gerhardt Informatics Kft. and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Gerhardt Informatics Kft. - GEFGWT port
 *******************************************************************************/
package org.eclipse.gef.editpolicies;

import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gef.requests.GroupRequest;

/**
 * The <i>root</i> component cannot be removed from its parent. This EditPolicy
 * is typically installed on the Viewer's
 * {@link org.eclipse.gef.EditPartViewer#getContents() contents}.
 */
public class RootComponentEditPolicy extends ComponentEditPolicy {

	/**
	 * Overridden to prevent the host from being deleted.
	 * 
	 * @see org.eclipse.gef.editpolicies.ComponentEditPolicy#createDeleteCommand(GroupRequest)
	 */
	protected Command createDeleteCommand(GroupRequest request) {
		return UnexecutableCommand.INSTANCE;
	}

}