/*
 *  Copyright (c) 2006, 2009 Borland Software 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:
 *      Borland Software Corporation - initial API and implementation
 */
package org.eclipse.gmf.graphdef.editor.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.gmfgraph.ChildAccess;
import org.eclipse.gmf.gmfgraph.DiagramLabel;
import org.eclipse.gmf.graphdef.editor.edit.policies.GMFGraphBaseItemSemanticEditPolicy;
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;

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

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

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

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

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

	/**
	 * @generated
	 */
	public DiagramLabelAccessorReorientCommand(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 DiagramLabel) {
			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 ChildAccess && newEnd instanceof DiagramLabel)) {
			return false;
		}
		return GMFGraphBaseItemSemanticEditPolicy.LinkConstraints.canExistDiagramLabelAccessor_4004(getNewSource(), getOldTarget());
	}

	/**
	 * @generated
	 */
	protected boolean canReorientTarget() {
		if (!(oldEnd instanceof ChildAccess && newEnd instanceof ChildAccess)) {
			return false;
		}
		return GMFGraphBaseItemSemanticEditPolicy.LinkConstraints.canExistDiagramLabelAccessor_4004(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().setAccessor(null);
		getNewSource().setAccessor(getOldTarget());
		return CommandResult.newOKCommandResult(referenceOwner);
	}

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

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

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

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

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