org.hibernate.event.internal.OnReplicateVisitor Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008-2011, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.event.internal;
import java.io.Serializable;
import org.hibernate.HibernateException;
import org.hibernate.collection.spi.PersistentCollection;
import org.hibernate.event.spi.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;
}
}