OperatorSemanticEditPolicy.java

/*
 * Copyright (c) 2012-2016 Marsha Chechik, Alessio Di Sandro, Michalis Famelis,
 * Rick Salay.
 * 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:
 *    Alessio Di Sandro - Implementation.
 */
package edu.toronto.cs.se.mmint.mid.diagram.edit.policies;

import java.util.Iterator;

import org.eclipse.emf.ecore.EAnnotation;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gmf.runtime.diagram.core.commands.DeleteCommand;
import org.eclipse.gmf.runtime.emf.commands.core.command.CompositeTransactionalCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientReferenceRelationshipRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientRelationshipRequest;
import org.eclipse.gmf.runtime.notation.Edge;
import org.eclipse.gmf.runtime.notation.View;

import edu.toronto.cs.se.mmint.mid.diagram.edit.commands.OperatorDelCommand;
import edu.toronto.cs.se.mmint.mid.diagram.edit.parts.ExtendibleElementSupertypeEditPart;
import edu.toronto.cs.se.mmint.mid.diagram.edit.parts.ModelEndpoint2EditPart;
import edu.toronto.cs.se.mmint.mid.diagram.edit.parts.ModelEndpoint3EditPart;
import edu.toronto.cs.se.mmint.mid.diagram.part.MIDVisualIDRegistry;

public class OperatorSemanticEditPolicy extends OperatorItemSemanticEditPolicy {

	protected Command getDestroyElementCommand(DestroyElementRequest req) {
		View view = (View) getHost().getModel();
		CompositeTransactionalCommand cmd = new CompositeTransactionalCommand(
				getEditingDomain(), null);
		cmd.setTransactionNestingEnabled(true);
		for (Iterator<?> it = view.getTargetEdges().iterator(); it.hasNext();) {
			Edge incomingLink = (Edge) it.next();
			if (MIDVisualIDRegistry.getVisualID(incomingLink) == ExtendibleElementSupertypeEditPart.VISUAL_ID) {
				cmd.add(new DeleteCommand(getEditingDomain(), incomingLink));
				continue;
			}
		}
		for (Iterator<?> it = view.getSourceEdges().iterator(); it.hasNext();) {
			Edge outgoingLink = (Edge) it.next();
			if (MIDVisualIDRegistry.getVisualID(outgoingLink) == ExtendibleElementSupertypeEditPart.VISUAL_ID) {
				cmd.add(new DeleteCommand(getEditingDomain(), outgoingLink));
				continue;
			}
			if (MIDVisualIDRegistry.getVisualID(outgoingLink) == ModelEndpoint2EditPart.VISUAL_ID) {
				cmd.add(new DeleteCommand(getEditingDomain(), outgoingLink));
				continue;
			}
			if (MIDVisualIDRegistry.getVisualID(outgoingLink) == ModelEndpoint3EditPart.VISUAL_ID) {
				cmd.add(new DeleteCommand(getEditingDomain(), outgoingLink));
				continue;
			}
		}
		EAnnotation annotation = view.getEAnnotation("Shortcut"); //$NON-NLS-1$
		if (annotation == null) {
			// there are indirectly referenced children, need extra commands: false
			addDestroyShortcutsCommand(cmd, view);
			// delete host element
			cmd.add(new OperatorDelCommand(req));
		} else {
			cmd.add(new DeleteCommand(getEditingDomain(), view));
		}
		return getGEFWrapper(cmd.reduce());
	}

	protected Command getStartCreateRelationshipCommand(CreateRelationshipRequest req) {

		return null;
	}

	protected Command getCompleteCreateRelationshipCommand(CreateRelationshipRequest req) {

		return null;
	}

	protected Command getReorientRelationshipCommand(ReorientRelationshipRequest req) {

		return UnexecutableCommand.INSTANCE;
	}

	protected Command getReorientReferenceRelationshipCommand(ReorientReferenceRelationshipRequest req) {

		return UnexecutableCommand.INSTANCE;
	}

}