plugins/org.eclipse.emf.cdo/src/org/eclipse/emf/cdo/transaction/CDOUndoDetector.java

/*
 * Copyright (c) 2014, 2016 Eike Stepper (Loehne, Germany) 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:
 *    Eike Stepper - initial API and implementation
 */
package org.eclipse.emf.cdo.transaction;

import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;

import org.eclipse.emf.internal.cdo.transaction.CDOUndoDetectorImpl;

import org.eclipse.emf.ecore.EObject;

/**
 * A strategy used to detect whether the feature of an {@link EObject object} has the original (clean) value after a number of modifications.
 *
 * @see CDOTransaction.Options#setUndoDetector(CDOUndoDetector)
 * @author Eike Stepper
 * @since 4.3
 */
public interface CDOUndoDetector
{
  public static final CDOUndoDetector NO_FEATURES = new CDOUndoDetectorImpl.NoFeatures();

  public static final CDOUndoDetector SINGLE_VALUED_FEATURES = new CDOUndoDetectorImpl.SingleValuedFeatures();

  public static final CDOUndoDetector ALL_FEATURES = new CDOUndoDetectorImpl();

  public boolean detectUndo(CDOTransaction transaction, CDORevision cleanRevision, CDORevision currentRevision, CDOFeatureDelta featureDelta);
}