public PersistentCollection instantiate(SessionImplementor session, CollectionPersister persister, Serializable key) {
	if ( session.getEntityMode()==EntityMode.DOM4J ) {
		return new PersistentMapElementHolder(session, persister, key);
	}
	else {
		return new PersistentMap(session);
	}
}
 

public PersistentCollection wrap(SessionImplementor session, Object collection) {
	if ( session.getEntityMode()==EntityMode.DOM4J ) {
		return new PersistentMapElementHolder( session, (Element) collection );
	}
	else {
		return new PersistentMap( session, (java.util.Map) collection );
	}
}
 

public void init()
{
  collectionMap.put(PersistentBag.class, ArrayList.class);
  collectionMap.put(PersistentList.class, ArrayList.class);
  collectionMap.put(PersistentMap.class, HashMap.class);
  collectionMap.put(PersistentSet.class, HashSet.class);
  collectionMap.put(PersistentSortedMap.class, TreeMap.class);
  collectionMap.put(PersistentSortedSet.class, TreeSet.class);
}