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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:
* Simon McDuff - initial API and implementation
**************************************************************************/
package org.eclipse.emf.internal.cdo.view;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.revision.CDOList;
import org.eclipse.emf.cdo.session.CDORevisionManager;
import org.eclipse.emf.cdo.view.CDORevisionPrefetchingPolicy;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
* @author Simon McDuff
* @since 2.0
*/
public class CDORevisionPrefetchingPolicyImpl implements CDORevisionPrefetchingPolicy
{
private int chunkSize;
public CDORevisionPrefetchingPolicyImpl(int chunkSize)
{
this.chunkSize = chunkSize;
}
public Collection<CDOID> loadAhead(CDORevisionManager revisionManager, EObject eObject, EStructuralFeature feature,
CDOList list, int accessIndex, CDOID accessID)
{
if (chunkSize > 1 && !revisionManager.containsRevision(accessID))
{
int fromIndex = accessIndex;
int toIndex = Math.min(accessIndex + chunkSize, list.size()) - 1;
Set<CDOID> notRegistered = new HashSet<CDOID>();
for (int i = fromIndex; i <= toIndex; i++)
{
Object element = list.get(i);
if (element instanceof CDOID)
{
CDOID idElement = (CDOID)element;
if (!idElement.isTemporary())
{
if (!revisionManager.containsRevision(idElement))
{
if (!notRegistered.contains(idElement))
{
notRegistered.add(idElement);
}
}
}
}
}
return notRegistered;
}
return Collections.emptySet();
}
}
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