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/*
* Copyright (c) 2009, 2011, 2012, 2015, 2016 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:
* Simon McDuff - initial API and implementation
* Eike Stepper - maintenance
*/
package org.eclipse.emf.internal.cdo.session;
import org.eclipse.emf.cdo.common.revision.CDOElementProxy;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.session.CDOCollectionLoadingPolicy;
import org.eclipse.emf.cdo.session.CDOSession;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.net4j.util.collection.MoveableList;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.spi.cdo.CDOSessionProtocol;
import org.eclipse.emf.spi.cdo.InternalCDOSession;
/**
* @author Simon McDuff
* @since 2.0
*/
public class CDOCollectionLoadingPolicyImpl implements CDOCollectionLoadingPolicy
{
private CDOSession session;
private int initialChunkSize;
private int resolveChunkSize;
public CDOCollectionLoadingPolicyImpl(int initialChunkSize, int resolveChunkSize)
{
this.resolveChunkSize = resolveChunkSize <= 0 ? CDORevision.UNCHUNKED : resolveChunkSize;
this.initialChunkSize = initialChunkSize < 0 ? this.resolveChunkSize : initialChunkSize;
}
public CDOSession getSession()
{
return session;
}
public void setSession(CDOSession session)
{
this.session = session;
}
public int getInitialChunkSize()
{
return initialChunkSize;
}
public int getResolveChunkSize()
{
return resolveChunkSize;
}
public void resolveAllProxies(CDORevision revision, EStructuralFeature feature)
{
doResolveProxy(revision, feature, 0, 0, Integer.MAX_VALUE);
}
public Object resolveProxy(CDORevision rev, EStructuralFeature feature, int accessIndex, int serverIndex)
{
int chunkSize = resolveChunkSize;
if (chunkSize == CDORevision.UNCHUNKED)
{
// Can happen if CDOSession.setReferenceChunkSize() was called meanwhile
chunkSize = Integer.MAX_VALUE;
}
return doResolveProxy(rev, feature, accessIndex, serverIndex, chunkSize);
}
private Object doResolveProxy(CDORevision rev, EStructuralFeature feature, int accessIndex, int serverIndex, int chunkSize)
{
// Get proxy values
InternalCDORevision revision = (InternalCDORevision)rev;
int fetchIndex = serverIndex;
MoveableList<Object> list = revision.getListOrNull(feature);
if (list == null)
{
return null;
}
int size = list.size();
int fromIndex = accessIndex;
int toIndex = accessIndex;
boolean minReached = false;
boolean maxReached = false;
boolean alternation = false;
for (int i = 0; i < chunkSize; i++)
{
if (alternation)
{
if (!maxReached && toIndex < size - 1 && list.get(toIndex + 1) instanceof CDOElementProxy)
{
++toIndex;
}
else
{
maxReached = true;
}
if (!minReached)
{
alternation = false;
}
}
else
{
if (!minReached && fromIndex > 0 && list.get(fromIndex - 1) instanceof CDOElementProxy)
{
--fromIndex;
}
else
{
minReached = true;
}
if (!maxReached)
{
alternation = true;
}
}
if (minReached && maxReached)
{
break;
}
}
CDOSessionProtocol protocol = ((InternalCDOSession)session).getSessionProtocol();
return protocol.loadChunk(revision, feature, accessIndex, fetchIndex, fromIndex, toIndex);
}
}
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