//$Id: OnReplicateVisitor.java 10948 2006-12-07 21:53:10Z steve.ebersole@jboss.com $
package org.hibernate.event.def;
import java.io.Serializable;
import org.hibernate.HibernateException;
import org.hibernate.collection.PersistentCollection;
import org.hibernate.event.EventSource;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.type.CollectionType;
/**
* When an entity is passed to replicate(), and there is an existing row, we must
* inspect all its collections and
* 1. associate any uninitialized PersistentCollections with this session
* 2. associate any initialized PersistentCollections with this session, using the
* existing snapshot
* 3. execute a collection removal (SQL DELETE) for each null collection property
* or "new" collection
*
* @author Gavin King
*/
public class OnReplicateVisitor extends ReattachVisitor {
private boolean isUpdate;
OnReplicateVisitor(EventSource session, Serializable key, Object owner, boolean isUpdate) {
super( session, key, owner );
this.isUpdate = isUpdate;
}
Object processCollection(Object collection, CollectionType type)
throws HibernateException {
if ( collection == CollectionType.UNFETCHED_COLLECTION ) {
return null;
}
EventSource session = getSession();
CollectionPersister persister = session.getFactory().getCollectionPersister( type.getRole() );
if ( isUpdate ) {
removeCollection( persister, extractCollectionKeyFromOwner( persister ), session );
}
if ( collection != null && ( collection instanceof PersistentCollection ) ) {
PersistentCollection wrapper = ( PersistentCollection ) collection;
wrapper.setCurrentSession( session );
if ( wrapper.wasInitialized() ) {
session.getPersistenceContext().addNewCollection( persister, wrapper );
}
else {
reattachCollection( wrapper, type );
}
}
else {
// otherwise a null or brand new collection
// this will also (inefficiently) handle arrays, which
// have no snapshot, so we can't do any better
//processArrayOrNewCollection(collection, type);
}
return null;
}
}