//$Id: OnLockVisitor.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.engine.SessionImplementor;
import org.hibernate.event.EventSource;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.type.CollectionType;
/**
* When a transient entity is passed to lock(), 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. throw an exception for each "new" collection
*
* @author Gavin King
*/
public class OnLockVisitor extends ReattachVisitor {
public OnLockVisitor(EventSource session, Serializable key, Object owner) {
super( session, key, owner );
}
Object processCollection(Object collection, CollectionType type) throws HibernateException {
SessionImplementor session = getSession();
CollectionPersister persister = session.getFactory().getCollectionPersister( type.getRole() );
if ( collection == null ) {
//do nothing
}
else if ( collection instanceof PersistentCollection ) {
PersistentCollection persistentCollection = ( PersistentCollection ) collection;
if ( persistentCollection.setCurrentSession( session ) ) {
if ( isOwnerUnchanged( persistentCollection, persister, extractCollectionKeyFromOwner( persister ) ) ) {
// a "detached" collection that originally belonged to the same entity
if ( persistentCollection.isDirty() ) {
throw new HibernateException( "reassociated object has dirty collection" );
}
reattachCollection( persistentCollection, type );
}
else {
// a "detached" collection that belonged to a different entity
throw new HibernateException( "reassociated object has dirty collection reference" );
}
}
else {
// a collection loaded in the current session
// can not possibly be the collection belonging
// to the entity passed to update()
throw new HibernateException( "reassociated object has dirty collection reference" );
}
}
else {
// brand new collection
//TODO: or an array!! we can't lock objects with arrays now??
throw new HibernateException( "reassociated object has dirty collection reference (or an array)" );
}
return null;
}
}