| /******************************************************************************* |
| * 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; |
| |
| import org.eclipse.core.runtime.IAdaptable; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| |
| /** |
| * <p> |
| * An operation approver that enforces a strict linear undo. It does not allow |
| * the undo or redo of any operation that is not the latest available operation |
| * in all of its undo contexts. This class may be instantiated by clients. |
| * </p> |
| * |
| * @since 3.1 |
| */ |
| public final class LinearUndoEnforcer extends LinearUndoViolationDetector { |
| /** |
| * Create an instance of LinearUndoEnforcer. |
| */ |
| public LinearUndoEnforcer() { |
| super(); |
| } |
| |
| /* |
| * Return whether a linear redo violation is allowable. A linear redo violation |
| * is defined as a request to redo a particular operation even if it is not the most |
| * recently added operation to the redo history. |
| */ |
| protected IStatus allowLinearRedoViolation(IUndoableOperation operation, |
| IUndoContext context, IOperationHistory history, IAdaptable uiInfo) { |
| return Status.CANCEL_STATUS; |
| } |
| |
| /* |
| * Return whether a linear undo violation is allowable. A linear undo violation |
| * is defined as a request to undo a particular operation even if it is not the most |
| * recently added operation to the undo history. |
| */ |
| protected IStatus allowLinearUndoViolation(IUndoableOperation operation, |
| IUndoContext context, IOperationHistory history, IAdaptable uiInfo) { |
| return Status.CANCEL_STATUS; |
| } |
| |
| } |