| /****************************************************************************** |
| * Copyright (c) 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.gmf.examples.runtime.emf.clipboard.actions; |
| |
| import java.util.Collections; |
| import java.util.Set; |
| |
| import org.eclipse.emf.common.command.AbstractCommand; |
| import org.eclipse.emf.ecore.change.ChangeDescription; |
| import org.eclipse.emf.ecore.change.util.ChangeRecorder; |
| import org.eclipse.emf.edit.domain.EditingDomain; |
| |
| |
| /** |
| * A command that records the changes made by an arbitrary {@link Runnable}, |
| * to be able to undo them, later. |
| */ |
| public class RecordingCommand |
| extends AbstractCommand { |
| |
| private Runnable runnable; |
| private Set notifiers; |
| private ChangeRecorder recorder; |
| private ChangeDescription change; |
| |
| /** |
| * Initializes me with my label and my runnable to execute. |
| * |
| * @param domain my editing domain |
| * @param label my label |
| * @param runnable the change that I need to make |
| */ |
| public RecordingCommand(EditingDomain domain, String label, Runnable runnable) { |
| super(label); |
| this.runnable = runnable; |
| recorder = new ChangeRecorder(); |
| notifiers = Collections.singleton(domain.getResourceSet()); |
| } |
| |
| /** |
| * I run the runnable when I execute the first time. |
| */ |
| public void execute() { |
| try { |
| recorder.beginRecording(notifiers); |
| runnable.run(); |
| } finally { |
| change = recorder.endRecording(); |
| runnable = null; |
| } |
| } |
| |
| /** |
| * I am ready to execute if I haven't recorded any changes, yet. |
| */ |
| protected boolean prepare() { |
| return change == null; |
| } |
| |
| /** |
| * Applies (undoes) changes recorded previously, recording the new changes |
| * meanwhile. |
| */ |
| private void applyChanges() { |
| try { |
| recorder.beginRecording(notifiers); |
| change.apply(); |
| } finally { |
| change = recorder.endRecording(); |
| } |
| } |
| |
| /** |
| * I can undo if I have recorded any changes previously. |
| */ |
| public boolean canUndo() { |
| return change != null; |
| } |
| |
| /** |
| * Undoes by applying recorded changes. |
| */ |
| public void undo() { |
| applyChanges(); |
| } |
| |
| /** |
| * Redoes by applying changes recorded in the last undo. |
| */ |
| public void redo() { |
| applyChanges(); |
| } |
| |
| public void dispose() { |
| change = null; |
| recorder = null; |
| notifiers = null; |
| runnable = null; |
| } |
| } |