/*******************************************************************************
 * Copyright (c) 2006-2012
 * Software Technology Group, Dresden University of Technology
 * DevBoost GmbH, Berlin, Amtsgericht Charlottenburg, HRB 140026
 * 
 * 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:
 *   Software Technology Group - TU Dresden, Germany;
 *   DevBoost GmbH - Berlin, Germany
 *      - initial API and implementation
 ******************************************************************************/
package org.reuseware.coconut.compositionprogram.diagram.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.common.core.command.ICommand;
import org.eclipse.gmf.runtime.emf.type.core.IElementType;
import org.eclipse.gmf.runtime.emf.type.core.commands.EditElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.ConfigureRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest;
import org.reuseware.coconut.compositionprogram.CompositionLink;
import org.reuseware.coconut.compositionprogram.CompositionProgram;
import org.reuseware.coconut.compositionprogram.CompositionprogramFactory;
import org.reuseware.coconut.compositionprogram.PortInstance;
import org.reuseware.coconut.compositionprogram.diagram.edit.policies.CompositionprogramBaseItemSemanticEditPolicy;

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

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

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

	/**
	 * @generated
	 */
	private final CompositionProgram container;

	/**
	 * @generated
	 */
	public CompositionLinkCreateCommand(CreateRelationshipRequest request,
			EObject source, EObject target) {
		super(request.getLabel(), null, request);
		this.source = source;
		this.target = target;
		container = deduceContainer(source, target);
	}

	/**
	 * @generated
	 */
	public boolean canExecute() {
		if (source == null && target == null) {
			return false;
		}
		if (source != null && false == source instanceof PortInstance) {
			return false;
		}
		if (target != null && false == target instanceof PortInstance) {
			return false;
		}
		if (getSource() == null) {
			return true; // link creation is in progress; source is not defined yet
		}
		// target may be null here but it's possible to check constraint
		if (getContainer() == null) {
			return false;
		}
		return CompositionprogramBaseItemSemanticEditPolicy
				.getLinkConstraints().canCreateCompositionLink_4001(
						getContainer(), getSource(), getTarget());
	}

	/**
	 * @generated
	 */
	protected CommandResult doExecuteWithResult(IProgressMonitor monitor,
			IAdaptable info) throws ExecutionException {
		if (!canExecute()) {
			throw new ExecutionException(
					"Invalid arguments in create link command"); //$NON-NLS-1$
		}

		CompositionLink newElement = CompositionprogramFactory.eINSTANCE
				.createCompositionLink();
		getContainer().getCompositionLinks().add(newElement);
		newElement.setSource(getSource());
		newElement.setTarget(getTarget());
		doConfigure(newElement, monitor, info);
		((CreateElementRequest) getRequest()).setNewElement(newElement);
		
		return CommandResult.newOKCommandResult(newElement);

	}

	/**
	 * Added call to match()
	 * 
	 * @generated
	 */
	protected void doConfigure(CompositionLink newElement,
			IProgressMonitor monitor, IAdaptable info)
			throws ExecutionException {
		IElementType elementType = ((CreateElementRequest) getRequest())
				.getElementType();
		ConfigureRequest configureRequest = new ConfigureRequest(
				getEditingDomain(), newElement, elementType);
		configureRequest.setClientContext(((CreateElementRequest) getRequest())
				.getClientContext());
		configureRequest.addParameters(getRequest().getParameters());
		configureRequest.setParameter(CreateRelationshipRequest.SOURCE,
				getSource());
		configureRequest.setParameter(CreateRelationshipRequest.TARGET,
				getTarget());
		ICommand configureCommand = elementType
				.getEditCommand(configureRequest);
		if (configureCommand != null && configureCommand.canExecute()) {
			configureCommand.execute(monitor, info);
		}
	}

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

	/**
	 * @generated
	 */
	protected PortInstance getSource() {
		return (PortInstance) source;
	}

	/**
	 * @generated
	 */
	protected PortInstance getTarget() {
		return (PortInstance) target;
	}

	/**
	 * @generated
	 */
	public CompositionProgram getContainer() {
		return container;
	}

	/**
	 * Default approach is to traverse ancestors of the source to find instance of container.
	 * Modify with appropriate logic.
	 * @generated
	 */
	private static CompositionProgram deduceContainer(EObject source,
			EObject target) {
		// Find container element for the new link.
		// Climb up by containment hierarchy starting from the source
		// and return the first element that is instance of the container class.
		for (EObject element = source; element != null; element = element
				.eContainer()) {
			if (element instanceof CompositionProgram) {
				return (CompositionProgram) element;
			}
		}
		return null;
	}

}