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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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
* Simon McDuff - http://bugs.eclipse.org/201266
**************************************************************************/
package org.eclipse.emf.cdo.internal.common.revision.delta;
import org.eclipse.emf.cdo.common.CDODataInput;
import org.eclipse.emf.cdo.common.CDODataOutput;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDTemp;
import org.eclipse.emf.cdo.common.model.CDOClass;
import org.eclipse.emf.cdo.common.model.CDOFeature;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.common.revision.CDORevisionData;
import org.eclipse.emf.cdo.common.revision.delta.CDOClearFeatureDelta;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDeltaVisitor;
import org.eclipse.emf.cdo.spi.common.InternalCDORevision;
import org.eclipse.emf.cdo.spi.common.InternalCDORevisionDelta;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* @author Eike Stepper
*/
public class CDORevisionDeltaImpl implements InternalCDORevisionDelta
{
private CDOID cdoID;
private CDOClass cdoClass;
private int dirtyVersion;
private int originVersion;
private Map<CDOFeature, CDOFeatureDelta> featureDeltas = new HashMap<CDOFeature, CDOFeatureDelta>();
public CDORevisionDeltaImpl(CDORevision revision)
{
cdoID = revision.getID();
cdoClass = revision.getCDOClass();
dirtyVersion = revision.getVersion();
originVersion = dirtyVersion - 1;
}
public CDORevisionDeltaImpl(CDORevision originRevision, CDORevision dirtyRevision)
{
if (originRevision.getCDOClass() != dirtyRevision.getCDOClass())
{
throw new IllegalArgumentException();
}
cdoID = originRevision.getID();
cdoClass = originRevision.getCDOClass();
dirtyVersion = dirtyRevision.getVersion();
originVersion = originRevision.getVersion();
compare(originRevision, dirtyRevision);
CDORevisionData originData = originRevision.getData();
CDORevisionData dirtyData = dirtyRevision.getData();
if (!compare(originData.getContainerID(), dirtyData.getContainerID())
|| !compare(originData.getContainingFeatureID(), dirtyData.getContainingFeatureID()))
{
addFeatureDelta(new CDOContainerFeatureDeltaImpl(dirtyData.getContainerID(), dirtyData.getContainingFeatureID()));
}
}
public CDORevisionDeltaImpl(CDODataInput in) throws IOException
{
cdoClass = in.readCDOClassRefAndResolve();
cdoID = in.readCDOID();
originVersion = in.readInt();
dirtyVersion = in.readInt();
int size = in.readInt();
for (int i = 0; i < size; i++)
{
CDOFeatureDelta featureDelta = in.readCDOFeatureDelta(cdoClass);
featureDeltas.put(featureDelta.getFeature(), featureDelta);
}
}
public void write(CDODataOutput out) throws IOException
{
out.writeCDOClassRef(cdoClass);
out.writeCDOID(cdoID);
out.writeInt(originVersion);
out.writeInt(dirtyVersion);
out.writeInt(featureDeltas.size());
for (CDOFeatureDelta featureDelta : featureDeltas.values())
{
out.writeCDOFeatureDelta(featureDelta, cdoClass);
}
}
public CDOID getID()
{
return cdoID;
}
public int getOriginVersion()
{
return originVersion;
}
public int getDirtyVersion()
{
return dirtyVersion;
}
public List<CDOFeatureDelta> getFeatureDeltas()
{
return new ArrayList<CDOFeatureDelta>(featureDeltas.values());
}
public void apply(CDORevision revision)
{
((InternalCDORevision)revision).setVersion(dirtyVersion);
for (CDOFeatureDelta featureDelta : featureDeltas.values())
{
((CDOFeatureDeltaImpl)featureDelta).apply(revision);
}
}
public void addFeatureDelta(CDOFeatureDelta delta)
{
CDOFeature feature = delta.getFeature();
if (feature.isMany())
{
CDOListFeatureDeltaImpl lookupDelta = (CDOListFeatureDeltaImpl)featureDeltas.get(feature);
if (lookupDelta == null)
{
lookupDelta = new CDOListFeatureDeltaImpl(feature);
featureDeltas.put(lookupDelta.getFeature(), lookupDelta);
}
// Remove all previous changes
if (delta instanceof CDOClearFeatureDelta)
{
lookupDelta.getListChanges().clear();
}
lookupDelta.add(delta);
}
else
{
featureDeltas.put(feature, delta);
}
}
public void adjustReferences(Map<CDOIDTemp, CDOID> idMappings)
{
for (CDOFeatureDelta featureDelta : featureDeltas.values())
{
((CDOFeatureDeltaImpl)featureDelta).adjustReferences(idMappings);
}
}
public void accept(CDOFeatureDeltaVisitor visitor)
{
for (CDOFeatureDelta featureDelta : featureDeltas.values())
{
((CDOFeatureDeltaImpl)featureDelta).accept(visitor);
}
}
private void compare(CDORevision originRevision, CDORevision dirtyRevision)
{
CDOFeature features[] = cdoClass.getAllFeatures();
int count = cdoClass.getFeatureCount();
for (int i = 0; i < count; i++)
{
CDOFeature feature = features[i];
if (feature.isMany())
{
int originSize = originRevision.getData().size(feature);
int dirtySize = dirtyRevision.getData().size(feature);
if (dirtySize == 0 && originSize > 0)
{
addFeatureDelta(new CDOClearFeatureDeltaImpl(feature));
}
else
{
int originIndex = 0;
int dirtyIndex = 0;
if (originSize == dirtySize)
{
for (; originIndex < originSize && dirtyIndex < dirtySize; dirtyIndex++, originIndex++)
{
Object originValue = originRevision.getData().get(feature, originIndex);
Object dirtyValue = dirtyRevision.getData().get(feature, dirtyIndex);
if (!compare(originValue, dirtyValue))
{
dirtyIndex = 0;
break;
}
}
}
if (originIndex != originSize || dirtyIndex != dirtySize)
{
// Not identical
// Be very stupid and do the simplest thing.
// Clear and add all value;
if (originSize > 0)
{
addFeatureDelta(new CDOClearFeatureDeltaImpl(feature));
}
for (int k = 0; k < dirtySize; k++)
{
Object dirtyValue = dirtyRevision.getData().get(feature, k);
addFeatureDelta(new CDOAddFeatureDeltaImpl(feature, k, dirtyValue));
}
}
}
}
else
{
Object originValue = originRevision.getData().get(feature, 0);
Object dirtyValue = dirtyRevision.getData().get(feature, 0);
if (!compare(originValue, dirtyValue))
{
if (dirtyValue == null)
{
addFeatureDelta(new CDOUnsetFeatureDeltaImpl(feature));
}
else
{
addFeatureDelta(new CDOSetFeatureDeltaImpl(feature, 0, dirtyValue));
}
}
}
}
}
private boolean compare(Object originValue, Object dirtyValue)
{
return originValue == dirtyValue || originValue != null && dirtyValue != null && originValue.equals(dirtyValue);
}
}
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