/*******************************************************************************
* Copyright (c) 2005, 2015 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.
*/
@Override
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.
*/
@Override
protected IStatus allowLinearUndoViolation(IUndoableOperation operation,
IUndoContext context, IOperationHistory history, IAdaptable uiInfo) {
return Status.CANCEL_STATUS;
}
}