//$Id: ReattachVisitor.java 14290 2008-01-25 02:34:41Z gbadner $
package org.hibernate.event.def;
import java.io.Serializable;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
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;
/**
* Abstract superclass of visitors that reattach collections.
*
* @author Gavin King
*/
public abstract class ReattachVisitor extends ProxyVisitor {
private static final Log log = LogFactory.getLog( 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 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() );
}
}
}
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