/*****************************************************************************
 * Copyright (c) 2010 CEA LIST.
 *
 *    
 * 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:
 *  Saadia Dhouib saadia.dhouib@cea.fr  
 *
 *****************************************************************************/
package org.eclipse.papyrus.uml.diagram.communication.edit.commands;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gmf.runtime.common.core.command.CommandResult;
import org.eclipse.gmf.runtime.emf.type.core.commands.EditElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientReferenceRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientRelationshipRequest;
import org.eclipse.papyrus.uml.diagram.communication.edit.policies.UMLBaseItemSemanticEditPolicy;
import org.eclipse.uml2.uml.Constraint;
import org.eclipse.uml2.uml.Element;

/**
 * @generated
 */
public class ConstraintConstrainedElementReorientCommand extends EditElementCommand {

	/**
	 * @generated
	 */
	private final int reorientDirection;

	/**
	 * @generated
	 */
	private final EObject referenceOwner;

	/**
	 * @generated
	 */
	private final EObject oldEnd;

	/**
	 * @generated
	 */
	private final EObject newEnd;

	/**
	 * @generated
	 */
	public ConstraintConstrainedElementReorientCommand(ReorientReferenceRelationshipRequest request) {
		super(request.getLabel(), null, request);
		reorientDirection = request.getDirection();
		referenceOwner = request.getReferenceOwner();
		oldEnd = request.getOldRelationshipEnd();
		newEnd = request.getNewRelationshipEnd();
	}

	/**
	 * @generated
	 */
	public boolean canExecute() {
		if(false == referenceOwner instanceof Constraint) {
			return false;
		}
		if(reorientDirection == ReorientRelationshipRequest.REORIENT_SOURCE) {
			return canReorientSource();
		}
		if(reorientDirection == ReorientRelationshipRequest.REORIENT_TARGET) {
			return canReorientTarget();
		}
		return false;
	}

	/**
	 * @generated
	 */
	protected boolean canReorientSource() {
		if(!(oldEnd instanceof Element && newEnd instanceof Constraint)) {
			return false;
		}
		return UMLBaseItemSemanticEditPolicy.getLinkConstraints().canExistConstraintConstrainedElement_8011(getNewSource(), getOldTarget());
	}

	/**
	 * @generated
	 */
	protected boolean canReorientTarget() {
		if(!(oldEnd instanceof Element && newEnd instanceof Element)) {
			return false;
		}
		return UMLBaseItemSemanticEditPolicy.getLinkConstraints().canExistConstraintConstrainedElement_8011(getOldSource(), getNewTarget());
	}

	/**
	 * @generated
	 */
	protected CommandResult doExecuteWithResult(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
		if(!canExecute()) {
			throw new ExecutionException("Invalid arguments in reorient link command"); //$NON-NLS-1$
		}
		if(reorientDirection == ReorientRelationshipRequest.REORIENT_SOURCE) {
			return reorientSource();
		}
		if(reorientDirection == ReorientRelationshipRequest.REORIENT_TARGET) {
			return reorientTarget();
		}
		throw new IllegalStateException();
	}

	/**
	 * @generated
	 */
	protected CommandResult reorientSource() throws ExecutionException {
		getOldSource().getConstrainedElements().remove(getOldTarget());
		getNewSource().getConstrainedElements().add(getOldTarget());
		return CommandResult.newOKCommandResult(referenceOwner);
	}

	/**
	 * @generated
	 */
	protected CommandResult reorientTarget() throws ExecutionException {
		getOldSource().getConstrainedElements().remove(getOldTarget());
		getOldSource().getConstrainedElements().add(getNewTarget());
		return CommandResult.newOKCommandResult(referenceOwner);
	}

	/**
	 * @generated
	 */
	protected Constraint getOldSource() {
		return (Constraint)referenceOwner;
	}

	/**
	 * @generated
	 */
	protected Constraint getNewSource() {
		return (Constraint)newEnd;
	}

	/**
	 * @generated
	 */
	protected Element getOldTarget() {
		return (Element)oldEnd;
	}

	/**
	 * @generated
	 */
	protected Element getNewTarget() {
		return (Element)newEnd;
	}
}