| /******************************************************************************* |
| * Copyright (c) 2000, 2010 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.gef.examples.flow.model.commands; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.gef.commands.Command; |
| import org.eclipse.gef.examples.flow.model.Activity; |
| import org.eclipse.gef.examples.flow.model.StructuredActivity; |
| import org.eclipse.gef.examples.flow.model.Transition; |
| |
| /** |
| * Handles the deletion of Activities. |
| * |
| * @author Daniel Lee |
| */ |
| public class DeleteCommand extends Command { |
| |
| private Activity child; |
| private StructuredActivity parent; |
| private int index = -1; |
| private List sourceConnections = new ArrayList(); |
| private List targetConnections = new ArrayList(); |
| |
| private void deleteConnections(Activity a) { |
| if (a instanceof StructuredActivity) { |
| List children = ((StructuredActivity) a).getChildren(); |
| for (int i = 0; i < children.size(); i++) |
| deleteConnections((Activity) children.get(i)); |
| } |
| sourceConnections.addAll(a.getIncomingTransitions()); |
| for (int i = 0; i < sourceConnections.size(); i++) { |
| Transition t = (Transition) sourceConnections.get(i); |
| t.source.removeOutput(t); |
| a.removeInput(t); |
| } |
| targetConnections.addAll(a.getOutgoingTransitions()); |
| for (int i = 0; i < targetConnections.size(); i++) { |
| Transition t = (Transition) targetConnections.get(i); |
| t.target.removeInput(t); |
| a.removeOutput(t); |
| } |
| } |
| |
| /** |
| * @see org.eclipse.gef.commands.Command#execute() |
| */ |
| public void execute() { |
| primExecute(); |
| } |
| |
| /** |
| * Invokes the execution of this command. |
| */ |
| protected void primExecute() { |
| deleteConnections(child); |
| index = parent.getChildren().indexOf(child); |
| parent.removeChild(child); |
| } |
| |
| /** |
| * @see org.eclipse.gef.commands.Command#redo() |
| */ |
| public void redo() { |
| primExecute(); |
| } |
| |
| private void restoreConnections() { |
| for (int i = 0; i < sourceConnections.size(); i++) { |
| Transition t = (Transition) sourceConnections.get(i); |
| t.target.addInput(t); |
| t.source.addOutput(t); |
| } |
| sourceConnections.clear(); |
| for (int i = 0; i < targetConnections.size(); i++) { |
| Transition t = (Transition) targetConnections.get(i); |
| t.source.addOutput(t); |
| t.target.addInput(t); |
| } |
| targetConnections.clear(); |
| } |
| |
| /** |
| * Sets the child to the passed Activity |
| * |
| * @param a |
| * the child |
| */ |
| public void setChild(Activity a) { |
| child = a; |
| } |
| |
| /** |
| * Sets the parent to the passed StructuredActivity |
| * |
| * @param sa |
| * the parent |
| */ |
| public void setParent(StructuredActivity sa) { |
| parent = sa; |
| } |
| |
| /** |
| * @see org.eclipse.gef.commands.Command#undo() |
| */ |
| public void undo() { |
| parent.addChild(child, index); |
| restoreConnections(); |
| } |
| |
| } |