| /******************************************************************************* |
| * 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.core.commands.operations; |
| |
| /** |
| * <p> |
| * A simple, lightweight undo context that can be used to tag any operation. It |
| * does not provided a specialized label. This class may be instantiated by |
| * clients. This class may also be subclassed. |
| * </p> |
| * |
| * @since 3.1 |
| */ |
| public class UndoContext implements IUndoContext { |
| |
| /** |
| * <p> |
| * Get the label that describes the undo context. The default implementation |
| * returns the empty String. Subclasses may override. |
| * </p> |
| * |
| * @return the label for the context. |
| */ |
| public String getLabel() { |
| return ""; //$NON-NLS-1$ |
| } |
| |
| /** |
| * <p> |
| * Return whether the specified context is considered a match for the |
| * receiving context. When a context matches another context, operations |
| * that have the context are considered to also have the matching context. |
| * The default implementation checks whether the supplied context is |
| * identical to this context. Subclasses may override. |
| * </p> |
| * |
| * @param context |
| * the context to be checked against the receiving context. |
| * |
| * @return <code>true</code> if the receiving context can be considered a |
| * match for the specified context, and <code>false</code> if it |
| * cannot. |
| */ |
| public boolean matches(IUndoContext context) { |
| return context == this; |
| } |
| } |