/*
 * Copyright (c) 2005, 2006 IBM Corporation 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 implementation
 *
 */
package org.eclipse.epf.diagramming.edit.policies;

import java.util.List;

import org.eclipse.gef.commands.Command;
import org.eclipse.gmf.runtime.emf.type.core.commands.DestroyElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EAnnotation;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.emf.ecore.EClass;

import org.eclipse.epf.diagramming.providers.UMLElementTypes;

import org.eclipse.gef.commands.UnexecutableCommand;

import org.eclipse.gmf.runtime.emf.type.core.commands.CreateRelationshipCommand;

import org.eclipse.uml2.uml.ActivityNode;
import org.eclipse.uml2.uml.ControlFlow;
import org.eclipse.uml2.uml.JoinNode;
import org.eclipse.uml2.uml.StructuredActivityNode;
import org.eclipse.uml2.uml.UMLPackage;

/**
 * @generated
 */
public class JoinNodeItemSemanticEditPolicy extends
		UMLBaseItemSemanticEditPolicy {

	/**
	 * @generated
	 */
	protected Command getDestroyElementCommand(DestroyElementRequest req) {
		return getMSLWrapper(new DestroyElementCommand(req) {

			protected EObject getElementToDestroy() {
				View view = (View) getHost().getModel();
				EAnnotation annotation = view.getEAnnotation("Shortcut"); //$NON-NLS-1$
				if (annotation != null) {
					return view;
				}
				return super.getElementToDestroy();
			}

		});
	}

	/**
	 * @modified
	 */
	protected Command getCreateRelationshipCommand(CreateRelationshipRequest req) {
		//		if (UMLElementTypes.ControlFlow_3001 == req.getElementType()) {
		//			return req.getTarget() == null ? getCreateStartOutgoingControlFlow3001Command(req)
		//					: getCreateCompleteIncomingControlFlow3001Command(req);
		//		}
		return super.getCreateRelationshipCommand(req);
	}

	/**
	 * @see org.eclipse.epf.gmf.diagram.edit.policies.UMLBaseItemSemanticEditPolicy#getCreateOutgoing(org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest)
	 * @modified
	 */
	protected Command getCreateOutgoing(CreateRelationshipRequest req) {

		// Validation Join Node should allow only one outgoing connection.
		if (req.getSource() instanceof JoinNode) {
			JoinNode join = (JoinNode) req.getSource();
			List list = join.getOutgoings();
			if (list != null && list.size() >= 1) {
				return UnexecutableCommand.INSTANCE;
			}
		}
		return super.getCreateOutgoing(req);
	}

	/**
	 * @generated
	 */
	protected Command getCreateStartOutgoingControlFlow3001Command(
			CreateRelationshipRequest req) {
		return new Command() {
		};
	}

	/**
	 * @generated
	 */
	protected Command getCreateCompleteIncomingControlFlow3001Command(
			CreateRelationshipRequest req) {
		if (!(req.getSource() instanceof ActivityNode)) {
			return UnexecutableCommand.INSTANCE;
		}
		final StructuredActivityNode element = (StructuredActivityNode) getRelationshipContainer(
				req.getSource(), UMLPackage.eINSTANCE
						.getStructuredActivityNode(), req.getElementType());
		if (element == null) {
			return UnexecutableCommand.INSTANCE;
		}
		if (req.getContainmentFeature() == null) {
			req.setContainmentFeature(UMLPackage.eINSTANCE
					.getStructuredActivityNode_Edge());
		}
		return getMSLWrapper(new CreateIncomingControlFlow3001Command(req) {

			/**
			 * @generated
			 */
			protected EObject getElementToEdit() {
				return element;
			}
		});
	}

	/**
	 * @generated
	 */
	private static class CreateIncomingControlFlow3001Command extends
			CreateRelationshipCommand {

		/**
		 * @generated
		 */
		public CreateIncomingControlFlow3001Command(
				CreateRelationshipRequest req) {
			super(req);
		}

		/**
		 * @generated
		 */
		protected EClass getEClassToEdit() {
			return UMLPackage.eINSTANCE.getStructuredActivityNode();
		};

		/**
		 * @generated
		 */
		protected void setElementToEdit(EObject element) {
			throw new UnsupportedOperationException();
		}

		/**
		 * @generated
		 */
		protected EObject doDefaultElementCreation() {
			ControlFlow newElement = (ControlFlow) super
					.doDefaultElementCreation();
			if (newElement != null) {
				newElement.setTarget((ActivityNode) getTarget());
				newElement.setSource((ActivityNode) getSource());
			}
			return newElement;
		}
	}
}