* @param event The load event to be handled.
* @throws HibernateException
*/
public void onLoad(LoadEvent event, LoadEventListener.LoadType loadType) throws HibernateException {
final SessionImplementor source = event.getSession();
EntityPersister persister;
if ( event.getInstanceToLoad() != null ) {
persister = source.getEntityPersister( null, event.getInstanceToLoad() ); //the load() which takes an entity does not pass an entityName
event.setEntityClassName( event.getInstanceToLoad().getClass().getName() );
}
else {
persister = source.getFactory().getEntityPersister( event.getEntityClassName() );
}
if ( persister == null ) {
throw new HibernateException(
"Unable to locate persister: " +
event.getEntityClassName()
);
}
final Class idClass = persister.getIdentifierType().getReturnedClass();
if ( idClass != null && ! idClass.isInstance( event.getEntityId() ) ) {
// we may have the kooky jpa requirement of allowing find-by-id where
// "id" is the "simple pk value" of a dependent objects parent. This
// is part of its generally goofy "derived identity" "feature"
if ( persister.getEntityMetamodel().getIdentifierProperty().isEmbedded() ) {
final EmbeddedComponentType dependentIdType =
(EmbeddedComponentType) persister.getEntityMetamodel().getIdentifierProperty().getType();
if ( dependentIdType.getSubtypes().length == 1 ) {
final Type singleSubType = dependentIdType.getSubtypes()[0];
if ( singleSubType.isEntityType() ) {
final EntityType dependentParentType = (EntityType) singleSubType;
final Type dependentParentIdType = dependentParentType.getIdentifierOrUniqueKeyType( source.getFactory() );
if ( dependentParentIdType.getReturnedClass().isInstance( event.getEntityId() ) ) {
// yep that's what we have...
loadByDerivedIdentitySimplePkValue(
event,
loadType,
persister,
dependentIdType,
source.getFactory().getEntityPersister( dependentParentType.getAssociatedEntityName() )
);
return;
}
}
}
}
throw new TypeMismatchException(
"Provided id of the wrong type for class " + persister.getEntityName() + ". Expected: " + idClass + ", got " + event.getEntityId().getClass()
);
}
final EntityKey keyToLoad = source.generateEntityKey( event.getEntityId(), persister );
try {
if ( loadType.isNakedEntityReturned() ) {
//do not return a proxy!
//(this option indicates we are initializing a proxy)