Bug 105697 [Undo] - OperationHistoryEvent - cannot distinguish between canceled event or failed event
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/OperationHistoryEvent.java
/*******************************************************************************
 * 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>
 * OperationHistoryEvent is used to communicate changes that occur in a
 * DefaultOperationHistory, including the addition or removal of operations,
 * and the execution, undo, and redo of operations.
 * </p>
 * <p>
 * Operation history listeners must be prepared to receive notifications from a
 * background thread. Any UI access occurring inside the implementation must be
 * properly synchronized using the techniques specified by the client's widget
 * library.
 * </p>
 * 
 * 
 * @since 3.1
 */
public final class OperationHistoryEvent {