/*******************************************************************************
* Copyright (c) 2000, 2005 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.commands;
import java.util.ListIterator;
/**
* A CompoundCommand that performs undo on its contained Commands in the same order in
* which they were executed.
*/
public class ForwardUndoCompoundCommand
extends CompoundCommand
{
/**
* Constructs a ForwardUndoCompoundCommand with no label
*/
public ForwardUndoCompoundCommand() { }
/**
* Constructs a ForwardUndoCompoundCommand with the specified label
* @param label the label
*/
public ForwardUndoCompoundCommand(String label) {
super(label);
}
/**
* @see org.eclipse.gef.commands.Command#getDebugLabel()
*/
public String getDebugLabel() {
return "ForwardUndoCommand: " + super.getDebugLabel();//$NON-NLS-1$
}
/**
* Undo the command. For a Preorder compound command this
* means undoing all of the commands that it contains.
* Do it in the same order as applied.
*/
public void undo() {
ListIterator itr = getCommands().listIterator();
try {
while (itr.hasNext()) {
((Command) itr.next()).undo();
}
} catch (RuntimeException e) {
itr.previous(); // Skip over the one that failed. It cleaned itself up.
while (itr.hasPrevious()) {
((Command) itr.previous()).redo();
}
throw e;
}
}
}