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/*
* Copyright (c) 2014 Eike Stepper (Berlin, 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.internal.cdo.transaction;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDExternal;
import org.eclipse.emf.cdo.common.id.CDOIDProvider;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.delta.CDOContainerFeatureDelta;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.emf.cdo.transaction.CDOTransaction;
import org.eclipse.emf.cdo.transaction.CDOUndoDetector;
import org.eclipse.net4j.util.ObjectUtil;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import java.util.Iterator;
import java.util.List;
/**
* @author Eike Stepper
* @since 4.3
*/
public class CDOUndoDetectorImpl implements CDOUndoDetector
{
public boolean detectUndo(CDOTransaction transaction, CDORevision cleanRevision, CDORevision currentRevision,
CDOFeatureDelta featureDelta)
{
EStructuralFeature feature = featureDelta.getFeature();
InternalCDORevision cleanInternalRevision = (InternalCDORevision)cleanRevision;
InternalCDORevision currentInternalRevision = (InternalCDORevision)currentRevision;
if (ignore(feature, cleanInternalRevision, currentInternalRevision))
{
return false;
}
if (feature == CDOContainerFeatureDelta.CONTAINER_FEATURE)
{
return detectUndoContainer(transaction, cleanInternalRevision, currentInternalRevision);
}
Object cleanValue = cleanInternalRevision.getValue(feature);
Object currentValue = currentInternalRevision.getValue(feature);
if (feature instanceof EReference)
{
if (feature.isMany())
{
List<?> cleanList = (List<?>)cleanValue;
List<?> currentList = (List<?>)currentValue;
int cleanSize = size(cleanList);
int currentSize = size(currentList);
if (cleanSize != currentSize)
{
return false;
}
if (cleanSize != 0)
{
for (Iterator<?> cleanIterator = cleanList.iterator(), currentIterator = currentList.iterator(); //
cleanIterator.hasNext();)
{
Object cleanID = cleanIterator.next();
Object currentID = currentIterator.next();
if (!equalReference(transaction, cleanID, currentID))
{
return false;
}
}
}
return true;
}
return equalReference(transaction, cleanValue, currentValue);
}
return ObjectUtil.equals(cleanValue, currentValue);
}
/**
* @deprecated As of 4.5 {@link #detectUndo(CDOTransaction, CDORevision, CDORevision, CDOFeatureDelta)} is called.
*/
@Deprecated
protected boolean detectUndoContainer(InternalCDORevision cleanRevision, InternalCDORevision currentRevision)
{
throw new UnsupportedOperationException();
}
protected boolean detectUndoContainer(CDOTransaction transaction, InternalCDORevision cleanRevision,
InternalCDORevision currentRevision)
{
CDOID cleanResourceID = cleanRevision.getResourceID();
CDOID currentResourceID = currentRevision.getResourceID();
if (cleanResourceID != currentResourceID)
{
return false;
}
int cleanContainingFeatureID = cleanRevision.getContainingFeatureID();
int currentContainingFeatureID = currentRevision.getContainingFeatureID();
if (cleanContainingFeatureID != currentContainingFeatureID)
{
return false;
}
Object cleanContainerID = cleanRevision.getContainerID();
Object currentContainerID = currentRevision.getContainerID();
if (!equalReference(transaction, cleanContainerID, currentContainerID))
{
return false;
}
return true;
}
protected boolean ignore(EStructuralFeature feature, InternalCDORevision cleanRevision,
InternalCDORevision currentRevision)
{
return feature.isMany() && !cleanRevision.isUnchunked() && !currentRevision.isUnchunked();
}
private static boolean equalReference(CDOTransaction transaction, Object cleanValue, Object currentValue)
{
if (currentValue instanceof EObject && cleanValue instanceof CDOIDExternal)
{
CDOID id = ((CDOIDProvider)transaction).provideCDOID(currentValue);
if (id != null)
{
currentValue = id;
}
}
return cleanValue == currentValue;
}
private static int size(List<?> list)
{
if (list == null)
{
return 0;
}
return list.size();
}
/**
* @author Eike Stepper
*/
public static final class NoFeatures implements CDOUndoDetector
{
public boolean detectUndo(CDOTransaction transaction, CDORevision cleanRevision, CDORevision currentRevision,
CDOFeatureDelta featureDelta)
{
return false;
}
}
/**
* @author Eike Stepper
*/
public static final class SingleValuedFeatures extends CDOUndoDetectorImpl
{
@Override
protected boolean ignore(EStructuralFeature feature, InternalCDORevision cleanRevision,
InternalCDORevision currentRevision)
{
if (feature.isMany())
{
return false;
}
return super.ignore(feature, cleanRevision, currentRevision);
}
}
}
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