/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
*
* 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.def;
import java.io.Serializable;
import org.hibernate.HibernateException;
import org.hibernate.action.CollectionRemoveAction;
import org.hibernate.event.EventSource;
import org.hibernate.persister.collection.CollectionPersister;
import org.hibernate.pretty.MessageHelper;
import org.hibernate.type.AbstractComponentType;
import org.hibernate.type.Type;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Abstract superclass of visitors that reattach collections.
*
* @author Gavin King
*/
public abstract class ReattachVisitor extends ProxyVisitor {
private static final Logger log = LoggerFactory.getLogger( ReattachVisitor.class );
private final Serializable ownerIdentifier;
private final Object owner;
public ReattachVisitor(EventSource session, Serializable ownerIdentifier, Object owner) {
super( session );
this.ownerIdentifier = ownerIdentifier;
this.owner = owner;
}
/**
* Retrieve the identifier of the entity being visited.
*
* @return The entity's identifier.
*/
final Serializable getOwnerIdentifier() {
return ownerIdentifier;
}
/**
* Retrieve the entity being visited.
*
* @return The entity.
*/
final Object getOwner() {
return owner;
}
/**
* {@inheritDoc}
*/
Object processComponent(Object component, AbstractComponentType componentType) throws HibernateException {
Type[] types = componentType.getSubtypes();
if ( component == null ) {
processValues( new Object[types.length], types );
}
else {
super.processComponent( component, componentType );
}
return null;
}
/**
* Schedules a collection for deletion.
*
* @param role The persister representing the collection to be removed.
* @param collectionKey The collection key (differs from owner-id in the case of property-refs).
* @param source The session from which the request originated.
* @throws HibernateException
*/
void removeCollection(CollectionPersister role, Serializable collectionKey, EventSource source) throws HibernateException {
if ( log.isTraceEnabled() ) {
log.trace(
"collection dereferenced while transient " +
MessageHelper.collectionInfoString( role, ownerIdentifier, source.getFactory() )
);
}
source.getActionQueue().addAction( new CollectionRemoveAction( owner, role, collectionKey, false, source ) );
}
/**
* This version is slightly different for say
* {@link org.hibernate.type.CollectionType#getKeyOfOwner} in that here we
* need to assume that the owner is not yet associated with the session,
* and thus we cannot rely on the owner's EntityEntry snapshot...
*
* @param role The persister for the collection role being processed.
* @return
*/
final Serializable extractCollectionKeyFromOwner(CollectionPersister role) {
if ( role.getCollectionType().useLHSPrimaryKey() ) {
return ownerIdentifier;
}
else {
return ( Serializable ) role.getOwnerEntityPersister().getPropertyValue( owner, role.getCollectionType().getLHSPropertyName(), getSession().getEntityMode() );
}
}
}