/*****************************************************************************
 * Copyright (c) 2009 Atos Origin.
 *
 *    
 * 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:
 *  Emilien Perico (Atos Origin) emilien.perico@atosorigin.com - Initial API and implementation
 *
 *****************************************************************************/
package org.eclipse.papyrus.uml.diagram.usecase.edit.helpers;

import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.common.core.command.CompositeCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.emf.type.core.ElementTypeRegistry;
import org.eclipse.gmf.runtime.emf.type.core.IElementType;
import org.eclipse.gmf.runtime.emf.type.core.edithelper.AbstractEditHelper;
import org.eclipse.gmf.runtime.emf.type.core.edithelper.IEditHelperAdvice;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyReferenceRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.IEditCommandRequest;
import org.eclipse.papyrus.uml.diagram.common.commands.UnapplyAllStereotypesCommand;
import org.eclipse.uml2.uml.Element;

/**
 * @generated
 */
public class UMLBaseEditHelper extends AbstractEditHelper {

	/**
	 * @generated
	 */
	public static final String EDIT_POLICY_COMMAND = "edit policy command"; //$NON-NLS-1$

	/**
	 * @generated
	 */
	public static final String CONTEXT_ELEMENT_TYPE = "context element type"; //$NON-NLS-1$

	/**
	 * @generated
	 */
	protected IEditHelperAdvice[] getEditHelperAdvice(IEditCommandRequest req) {
		if(req.getParameter(CONTEXT_ELEMENT_TYPE) instanceof IElementType) {
			return ElementTypeRegistry.getInstance().getEditHelperAdvice((IElementType)req.getParameter(CONTEXT_ELEMENT_TYPE));
		}
		return super.getEditHelperAdvice(req);
	}

	/**
	 * @generated
	 */
	protected ICommand getInsteadCommand(IEditCommandRequest req) {
		ICommand epCommand = (ICommand)req.getParameter(EDIT_POLICY_COMMAND);
		req.setParameter(EDIT_POLICY_COMMAND, null);
		ICommand ehCommand = super.getInsteadCommand(req);
		if(epCommand == null) {
			return ehCommand;
		}
		if(ehCommand == null) {
			return epCommand;
		}
		CompositeCommand command = new CompositeCommand(null);
		command.add(epCommand);
		command.add(ehCommand);
		return command;
	}

	/**
	 * @generated
	 */
	protected ICommand getCreateCommand(CreateElementRequest req) {
		return null;
	}

	/**
	 * @generated
	 */
	protected ICommand getCreateRelationshipCommand(CreateRelationshipRequest req) {
		return null;
	}

	/**
	 * @generated NOT
	 *            handle unapply stereotypes before delete
	 */
	protected ICommand getDestroyElementCommand(DestroyElementRequest req) {
		EObject elementToDestroy = req.getElementToDestroy();
		if(elementToDestroy instanceof Element) {
			UnapplyAllStereotypesCommand command = new UnapplyAllStereotypesCommand(req.getEditingDomain(), req.getLabel(), (Element)elementToDestroy);
			if(!command.isEmpty()) {
				return command;
			}
		}
		return null;
	}

	/**
	 * @generated
	 */
	protected ICommand getDestroyReferenceCommand(DestroyReferenceRequest req) {
		return null;
	}
}