| /****************************************************************************** |
| * Copyright (c) 2006 IBM 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: |
| * IBM Corporation - initial API and implementation |
| ****************************************************************************/ |
| |
| package org.eclipse.gmf.runtime.diagram.core.edithelpers; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.emf.ecore.EReference; |
| import org.eclipse.gmf.runtime.common.core.command.CompositeCommand; |
| import org.eclipse.gmf.runtime.common.core.command.ICommand; |
| import org.eclipse.gmf.runtime.emf.core.util.EMFCoreUtil; |
| 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.notation.Edge; |
| import org.eclipse.gmf.runtime.notation.Node; |
| import org.eclipse.gmf.runtime.notation.NotationPackage; |
| import org.eclipse.gmf.runtime.notation.View; |
| |
| /** |
| * Edit helper advice for the {@link DestroyDependentsRequest} that destroys |
| * notations views under the following circumstances: |
| * <ul> |
| * <li>element being destroyed is the view's semantic referent</li> |
| * <li>element being destroyed is a Node or Edge to which an Edge is connected</li> |
| * </ul> |
| * |
| * @author Christian W. Damus (cdamus) |
| */ |
| public class NotationViewDependentsAdvice extends AbstractEditHelperAdvice { |
| protected ICommand getBeforeDestroyDependentsCommand(DestroyDependentsRequest request) { |
| EObject destructee = request.getElementToDestroy(); |
| ICommand result = null; |
| |
| // handle views referencing a semantic element being destroyed |
| |
| Collection semanticReferencers = EMFCoreUtil.getReferencers( |
| destructee, |
| new EReference[] {NotationPackage.Literals.VIEW__ELEMENT}); |
| |
| result = CompositeCommand.compose( |
| result, |
| request.getDestroyDependentsCommand(semanticReferencers)); |
| |
| // handle the node entries for views |
| |
| if (destructee instanceof View) { |
| Collection nodeEntryKeys = EMFCoreUtil.getReferencers( |
| destructee, |
| new EReference[] {NotationPackage.Literals.NODE_ENTRY__KEY}); |
| |
| result = CompositeCommand.compose( |
| result, |
| request.getDestroyDependentsCommand(nodeEntryKeys)); |
| } |
| |
| // handle the edges connected to nodes or other edges |
| |
| if (destructee instanceof Node || destructee instanceof Edge) { |
| View view = (View) destructee; |
| |
| result = CompositeCommand.compose( |
| result, |
| request.getDestroyDependentsCommand(view.getSourceEdges())); |
| |
| result = CompositeCommand.compose( |
| result, |
| request.getDestroyDependentsCommand(view.getTargetEdges())); |
| } |
| |
| return result; |
| } |
| } |