| /******************************************************************************* |
| * 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.ltk.core.refactoring; |
| |
| import org.eclipse.core.runtime.CoreException; |
| import org.eclipse.core.runtime.IProgressMonitor; |
| |
| import org.eclipse.ltk.internal.core.refactoring.Assert; |
| import org.eclipse.ltk.internal.core.refactoring.RefactoringCoreMessages; |
| |
| /** |
| * A refactoring change that does nothing. The reverse change of a |
| * <code>NullChange</code> is a <code>NullChange</code>. |
| * <p> |
| * Note: this class is not intended to be extended by clients. |
| * </p> |
| * |
| * @since 3.0 |
| */ |
| public class NullChange extends Change { |
| |
| private String fName; |
| |
| /** |
| * Creates a new <code>NullChange</code> with a default name. |
| */ |
| public NullChange() { |
| this(RefactoringCoreMessages.NullChange_name); |
| } |
| |
| /** |
| * Creates a new <code>NullChange</code> with the given name. |
| * |
| * @param name the human readable name of this change |
| */ |
| public NullChange(String name) { |
| Assert.isNotNull(name); |
| fName= name; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public String getName() { |
| return fName; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void initializeValidationData(IProgressMonitor pm) { |
| // do nothing |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public RefactoringStatus isValid(IProgressMonitor pm) throws CoreException { |
| return new RefactoringStatus(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Change perform(IProgressMonitor pm) throws CoreException { |
| return new NullChange(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Object getModifiedElement() { |
| return null; |
| } |
| } |