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/*******************************************************************************
 * Copyright (c) 2012 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
 *******************************************************************************/
package org.eclipse.papyrus.uml.diagram.timing.custom.helper.advice;

import java.util.Collection;

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.commands.DestroyElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.edithelper.AbstractEditHelperAdvice;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyDependentsRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.papyrus.uml.diagram.timing.custom.Messages;
import org.eclipse.papyrus.uml.diagram.timing.custom.utils.GateUtils;
import org.eclipse.uml2.uml.Gate;

/**
 * This HelperAdvice completes {@link Gate} edit commands with commands specific to the timing diagram in order to keep
 * the model consistent when deleting a {@link Gate}.
 */
public class GateHelperAdvice extends AbstractEditHelperAdvice {

	@Override
	protected ICommand getAfterDestroyDependentsCommand(final DestroyDependentsRequest request) {
		final EObject destructee = request.getElementToDestroy();
		if(destructee instanceof Gate) {
			final Gate gate = (Gate)destructee;
			final Collection<EObject> elementsToDestroy = GateUtils.getElementsToDelete(gate);
			if(!elementsToDestroy.isEmpty()) {
				final CompositeCommand compositeCommand = new CompositeCommand(Messages.GateHelperAdvice_DestroyGate);
				// destroy related elements
				for(final EObject eObject : elementsToDestroy) {
					final DestroyElementRequest destroyElementRequest = new DestroyElementRequest(eObject, false);
					final DestroyElementCommand destroyElementCommand = new DestroyElementCommand(destroyElementRequest);
					if(destroyElementCommand.canExecute()) {
						compositeCommand.add(destroyElementCommand);
					}
				}
				return compositeCommand;
			}
		}
		return null;
	}
}

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