| //------------------------------------------------------------------------------ |
| // Copyright (c) 2005, 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 implementation |
| //------------------------------------------------------------------------------ |
| package org.eclipse.epf.library.edit.command; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.HashSet; |
| |
| import org.eclipse.emf.common.command.AbstractCommand; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.epf.library.edit.ui.UserInteractionHelper; |
| import org.eclipse.epf.uma.MethodElement; |
| import org.eclipse.epf.uma.ecore.impl.MultiResourceEObject; |
| import org.eclipse.epf.uma.ecore.util.OppositeFeature; |
| |
| /** |
| * This command is used to set an opposite feature. |
| * |
| * @author Phong Nguyen Le |
| * @since 1.0 |
| */ |
| public class SetOppositeFeatureCommand extends AbstractCommand implements |
| IResourceAwareCommand { |
| |
| private MethodElement element; |
| |
| private OppositeFeature oppositeFeature; |
| |
| private EObject value; |
| |
| private EObject oldValue; |
| |
| private Collection modifiedResources; |
| |
| /** |
| * Creates a new instance. |
| */ |
| public SetOppositeFeatureCommand(MethodElement e, |
| OppositeFeature oppositeFeature, EObject value) { |
| this.element = e; |
| this.oppositeFeature = oppositeFeature; |
| this.value = value; |
| } |
| |
| public Collection getModifiedResources() { |
| if (modifiedResources == null) { |
| return Collections.EMPTY_LIST; |
| } |
| return modifiedResources; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.emf.common.command.AbstractCommand#prepare() |
| */ |
| protected boolean prepare() { |
| if (value instanceof MethodElement) { |
| return UserInteractionHelper.checkModifyOpposite( |
| (MethodElement) value, oppositeFeature.getTargetFeature(), |
| element); |
| } |
| return true; |
| } |
| |
| public void execute() { |
| oldValue = (EObject) ((MultiResourceEObject) element) |
| .getOppositeFeatureValue(oppositeFeature); |
| modifiedResources = new HashSet(); |
| |
| redo(); |
| } |
| |
| public void redo() { |
| if (oldValue != null && value == null) { |
| if (oppositeFeature.getTargetFeature().isMany()) { |
| ((Collection) oldValue.eGet(oppositeFeature.getTargetFeature())) |
| .remove(element); |
| } else { |
| oldValue.eSet(oppositeFeature.getTargetFeature(), null); |
| } |
| if (oldValue.eResource() != null) { |
| modifiedResources.add(oldValue.eResource()); |
| } |
| } |
| |
| if (value != null) { |
| if (oppositeFeature.getTargetFeature().isMany()) { |
| ((Collection) value.eGet(oppositeFeature.getTargetFeature())) |
| .add(element); |
| } else { |
| value.eSet(oppositeFeature.getTargetFeature(), element); |
| } |
| if (value.eResource() != null) { |
| modifiedResources.add(value.eResource()); |
| } |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.emf.common.command.AbstractCommand#undo() |
| */ |
| public void undo() { |
| if (value != null) { |
| if (oppositeFeature.getTargetFeature().isMany()) { |
| ((Collection) value.eGet(oppositeFeature.getTargetFeature())) |
| .remove(element); |
| } else { |
| value.eSet(oppositeFeature.getTargetFeature(), null); |
| } |
| } |
| |
| if (oldValue != null) { |
| if (oppositeFeature.getTargetFeature().isMany()) { |
| ((Collection) oldValue.eGet(oppositeFeature.getTargetFeature())) |
| .add(element); |
| } else { |
| oldValue.eSet(oppositeFeature.getTargetFeature(), element); |
| } |
| } |
| } |
| |
| } |