OnUpdateVisitorpublic class OnUpdateVisitor extends ReattachVisitor | When an entity is passed to update(), 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. execute a collection removal (SQL DELETE) for each null collection property
or "new" collection |
| Methods Summary |
|---|
| java.lang.Object | processCollection(java.lang.Object collection, org.hibernate.type.CollectionType type){@inheritDoc}
if ( collection == CollectionType.UNFETCHED_COLLECTION ) {
return null;
}
EventSource session = getSession();
CollectionPersister persister = session.getFactory().getCollectionPersister( type.getRole() );
final Serializable collectionKey = extractCollectionKeyFromOwner( persister );
if ( collection!=null && (collection instanceof PersistentCollection) ) {
PersistentCollection wrapper = (PersistentCollection) collection;
if ( wrapper.setCurrentSession(session) ) {
//a "detached" collection!
if ( !isOwnerUnchanged( wrapper, persister, collectionKey ) ) {
// if the collection belonged to a different entity,
// clean up the existing state of the collection
removeCollection( persister, collectionKey, session );
}
reattachCollection(wrapper, type);
}
else {
// a collection loaded in the current session
// can not possibly be the collection belonging
// to the entity passed to update()
removeCollection(persister, collectionKey, session);
}
}
else {
// null or brand new collection
// this will also (inefficiently) handle arrays, which have
// no snapshot, so we can't do any better
removeCollection(persister, collectionKey, session);
}
return null;
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