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/***************************************************************************
* Copyright (c) 2004 - 2008 Martin Taal 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:
* Martin Taal - copied from CDORevisionPropertyHandler and adapted
**************************************************************************/
package org.eclipse.emf.cdo.server.internal.hibernate.tuplizer;
import org.eclipse.emf.cdo.internal.protocol.revision.InternalCDORevision;
import org.eclipse.net4j.internal.util.collection.MoveableArrayList;
import org.hibernate.HibernateException;
import org.hibernate.collection.PersistentCollection;
/**
* @author Martin Taal
*/
// Howto handle hibernate lists:
// - a new owner: the owner is persisted and its lists are replaced with hibernate
// persistentlist, the hibernate persitentlist will have a delegate (internally) which is the list which was previously
// present in the owner.
// - an existing owner: the owner is read from the db and hibernate will set a persistentlist
// directly
//
// The solution also needs to handle the following:
// - cdo does not have direct java references but stores cdoids in the list while hibernate expects real java object
// references.
// - cdo uses a moveablearraylist and not the standard arraylist
//
// The solution:
// - never return null when hibernate asks for the current value of the manyreference, always
// return a MoveableArrayList so that hibernate uses that as the delegate, set the MoveableArrayList
public class CDOManyReferenceGetter extends CDOPropertyGetter
{
private static final long serialVersionUID = 1L;
public CDOManyReferenceGetter(CDORevisionTuplizer tuplizer, String propertyName)
{
super(tuplizer, propertyName);
}
@Override
public Object get(Object target) throws HibernateException
{
// check if there is already a persistentcollection
final PersistentCollection collection = PersistableListHolder.getInstance().getListMapping(target, getCDOFeature());
if (collection != null)
{
return collection;
}
// not yet, get the moveablearraylist
@SuppressWarnings("unchecked")
MoveableArrayList<Object> list = (MoveableArrayList<Object>)super.get(target);
if (list == null)
{
// TODO: what initial size?
list = new MoveableArrayList<Object>(10);
final InternalCDORevision revision = (InternalCDORevision)target;
revision.setValue(getCDOFeature(), list);
}
// wrap the moveablearraylist
final HibernateMoveableListWrapper wrapper = new HibernateMoveableListWrapper();
wrapper.setDelegate(list);
// and return it
return wrapper;
}
}
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