//$Id: ProxyVisitor.java 7181 2005-06-17 19:36:08Z oneovthafew $
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;
import org.hibernate.type.EntityType;
/**
* Reassociates uninitialized proxies with the session
* @author Gavin King
*/
public abstract class ProxyVisitor extends AbstractVisitor {
public ProxyVisitor(EventSource session) {
super(session);
}
Object processEntity(Object value, EntityType entityType) throws HibernateException {
if (value!=null) {
getSession().getPersistenceContext().reassociateIfUninitializedProxy(value);
// if it is an initialized proxy, let cascade
// handle it later on
}
return null;
}
/**
* Has the owner of the collection changed since the collection
* was snapshotted and detached?
*/
protected static boolean isOwnerUnchanged(
final PersistentCollection snapshot,
final CollectionPersister persister,
final Serializable id
) {
return isCollectionSnapshotValid(snapshot) &&
persister.getRole().equals( snapshot.getRole() ) &&
id.equals( snapshot.getKey() );
}
private static boolean isCollectionSnapshotValid(PersistentCollection snapshot) {
return snapshot != null &&
snapshot.getRole() != null &&
snapshot.getKey() != null;
}
/**
* Reattach a detached (disassociated) initialized or uninitialized
* collection wrapper, using a snapshot carried with the collection
* wrapper
*/
protected void reattachCollection(PersistentCollection collection, CollectionType type)
throws HibernateException {
if ( collection.wasInitialized() ) {
CollectionPersister collectionPersister = getSession().getFactory()
.getCollectionPersister( type.getRole() );
getSession().getPersistenceContext()
.addInitializedDetachedCollection( collectionPersister, collection );
}
else {
if ( !isCollectionSnapshotValid(collection) ) {
throw new HibernateException( "could not reassociate uninitialized transient collection" );
}
CollectionPersister collectionPersister = getSession().getFactory()
.getCollectionPersister( collection.getRole() );
getSession().getPersistenceContext()
.addUninitializedDetachedCollection( collectionPersister, collection );
}
}
}
|