TableItemSemanticEditPolicy.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.modelepedia.relationaldatabase.diagram.edit.policies;

import java.util.Iterator;

import org.eclipse.emf.ecore.EAnnotation;
import org.eclipse.gef.commands.Command;
import org.eclipse.gmf.runtime.common.core.command.ICompositeCommand;
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.commands.DestroyElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.commands.DestroyReferenceCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyElementRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.DestroyReferenceRequest;
import org.eclipse.gmf.runtime.notation.Edge;
import org.eclipse.gmf.runtime.notation.Node;
import org.eclipse.gmf.runtime.notation.View;

import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.edit.parts.ColumnEditPart;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.edit.parts.ForeignKeyEditPart;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.edit.parts.ForeignKeyForeignColumnEditPart;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.edit.parts.ForeignKeyTableColumnEditPart;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.edit.parts.TableTableColumnsCompartmentEditPart;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.edit.parts.TableTableForeignKeysCompartmentEditPart;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.part.RelationalDatabaseVisualIDRegistry;
import edu.toronto.cs.se.modelepedia.relationaldatabase.diagram.providers.RelationalDatabaseElementTypes;

/**
 * @generated
 */
public class TableItemSemanticEditPolicy extends
		RelationalDatabaseBaseItemSemanticEditPolicy {

	/**
	 * @generated
	 */
	public TableItemSemanticEditPolicy() {
		super(RelationalDatabaseElementTypes.Table_2001);
	}

	/**
	 * @generated
	 */
	protected Command getDestroyElementCommand(DestroyElementRequest req) {
		View view = (View) getHost().getModel();
		CompositeTransactionalCommand cmd = new CompositeTransactionalCommand(
				getEditingDomain(), null);
		cmd.setTransactionNestingEnabled(false);
		EAnnotation annotation = view.getEAnnotation("Shortcut"); //$NON-NLS-1$
		if (annotation == null) {
			// there are indirectly referenced children, need extra commands: false
			addDestroyChildNodesCommand(cmd);
			addDestroyShortcutsCommand(cmd, view);
			// delete host element
			cmd.add(new DestroyElementCommand(req));
		} else {
			cmd.add(new DeleteCommand(getEditingDomain(), view));
		}
		return getGEFWrapper(cmd.reduce());
	}

	/**
	 * @generated
	 */
	private void addDestroyChildNodesCommand(ICompositeCommand cmd) {
		View view = (View) getHost().getModel();
		for (Iterator<?> nit = view.getChildren().iterator(); nit.hasNext();) {
			Node node = (Node) nit.next();
			switch (RelationalDatabaseVisualIDRegistry.getVisualID(node)) {
			case TableTableColumnsCompartmentEditPart.VISUAL_ID:
				for (Iterator<?> cit = node.getChildren().iterator(); cit
						.hasNext();) {
					Node cnode = (Node) cit.next();
					switch (RelationalDatabaseVisualIDRegistry
							.getVisualID(cnode)) {
					case ColumnEditPart.VISUAL_ID:
						for (Iterator<?> it = cnode.getTargetEdges().iterator(); it
								.hasNext();) {
							Edge incomingLink = (Edge) it.next();
							if (RelationalDatabaseVisualIDRegistry
									.getVisualID(incomingLink) == ForeignKeyTableColumnEditPart.VISUAL_ID) {
								DestroyReferenceRequest r = new DestroyReferenceRequest(
										incomingLink.getSource().getElement(),
										null, incomingLink.getTarget()
												.getElement(), false);
								cmd.add(new DestroyReferenceCommand(r));
								cmd.add(new DeleteCommand(getEditingDomain(),
										incomingLink));
								continue;
							}
							if (RelationalDatabaseVisualIDRegistry
									.getVisualID(incomingLink) == ForeignKeyForeignColumnEditPart.VISUAL_ID) {
								DestroyReferenceRequest r = new DestroyReferenceRequest(
										incomingLink.getSource().getElement(),
										null, incomingLink.getTarget()
												.getElement(), false);
								cmd.add(new DestroyReferenceCommand(r));
								cmd.add(new DeleteCommand(getEditingDomain(),
										incomingLink));
								continue;
							}
						}
						cmd.add(new DestroyElementCommand(
								new DestroyElementRequest(getEditingDomain(),
										cnode.getElement(), false))); // directlyOwned: true
						// don't need explicit deletion of cnode as parent's view deletion would clean child views as well 
						// cmd.add(new org.eclipse.gmf.runtime.diagram.core.commands.DeleteCommand(getEditingDomain(), cnode));
						break;
					}
				}
				break;
			case TableTableForeignKeysCompartmentEditPart.VISUAL_ID:
				for (Iterator<?> cit = node.getChildren().iterator(); cit
						.hasNext();) {
					Node cnode = (Node) cit.next();
					switch (RelationalDatabaseVisualIDRegistry
							.getVisualID(cnode)) {
					case ForeignKeyEditPart.VISUAL_ID:
						for (Iterator<?> it = cnode.getSourceEdges().iterator(); it
								.hasNext();) {
							Edge outgoingLink = (Edge) it.next();
							if (RelationalDatabaseVisualIDRegistry
									.getVisualID(outgoingLink) == ForeignKeyTableColumnEditPart.VISUAL_ID) {
								DestroyReferenceRequest r = new DestroyReferenceRequest(
										outgoingLink.getSource().getElement(),
										null, outgoingLink.getTarget()
												.getElement(), false);
								cmd.add(new DestroyReferenceCommand(r));
								cmd.add(new DeleteCommand(getEditingDomain(),
										outgoingLink));
								continue;
							}
							if (RelationalDatabaseVisualIDRegistry
									.getVisualID(outgoingLink) == ForeignKeyForeignColumnEditPart.VISUAL_ID) {
								DestroyReferenceRequest r = new DestroyReferenceRequest(
										outgoingLink.getSource().getElement(),
										null, outgoingLink.getTarget()
												.getElement(), false);
								cmd.add(new DestroyReferenceCommand(r));
								cmd.add(new DeleteCommand(getEditingDomain(),
										outgoingLink));
								continue;
							}
						}
						cmd.add(new DestroyElementCommand(
								new DestroyElementRequest(getEditingDomain(),
										cnode.getElement(), false))); // directlyOwned: true
						// don't need explicit deletion of cnode as parent's view deletion would clean child views as well 
						// cmd.add(new org.eclipse.gmf.runtime.diagram.core.commands.DeleteCommand(getEditingDomain(), cnode));
						break;
					}
				}
				break;
			}
		}
	}

}