| //------------------------------------------------------------------------------ |
| // 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.authoring.gef.commands; |
| |
| import org.eclipse.epf.authoring.gef.util.Validation; |
| import org.eclipse.epf.authoring.ui.AuthoringUIResources; |
| import org.eclipse.epf.diagram.model.Link; |
| import org.eclipse.epf.diagram.model.Node; |
| import org.eclipse.gef.commands.Command; |
| |
| /** |
| * @author Phong Nguyen Le |
| * @since 1.0 |
| */ |
| public class DeleteLinkCommand extends Command { |
| |
| private Link link; |
| |
| private Node src, target; |
| |
| private int srcIndex, targetIndex; |
| |
| private static final String LABEL = AuthoringUIResources.gef_deleteLinkCommand_label; |
| |
| public DeleteLinkCommand(Link link, boolean isHardDelete) { |
| super(LABEL); |
| this.link = link; |
| src = link.getSource(); |
| target = link.getTarget(); |
| } |
| |
| public boolean canExecute() { |
| if (Validation.checkDelete(link) != null) |
| return false; |
| return link != null && src != null && target != null; |
| } |
| |
| /* |
| * This should work even if the link (view) was deleted. Eg., user selects a |
| * class and one of its references, and hits Ctrl+Del. The class will be |
| * deleted first and it will delete all its references. When this command is |
| * executed, it should do the hard-delete part. |
| */ |
| public void execute() { |
| srcIndex = src.getOutgoingConnections().indexOf(link); |
| targetIndex = target.getIncomingConnections().indexOf(link); |
| if (srcIndex != -1 && targetIndex != -1) { |
| src.getOutgoingConnections().remove(srcIndex); |
| target.getIncomingConnections().remove(targetIndex); |
| } |
| } |
| |
| public void undo() { |
| if (srcIndex != -1 && targetIndex != -1) { |
| src.getOutgoingConnections().add(srcIndex, link); |
| target.getIncomingConnections().add(targetIndex, link); |
| } |
| } |
| |
| } |