public interface BidirectionalEntityReference extends EntityReference
Represents the circular side of a bi-directional entity association. Wraps a reference to the associated
(target) EntityReference.
<p/>
The EntityReferenceAliases
for this object is the same as
for its target EntityReference, and can be looked up via
AliasResolutionContext.resolveEntityReferenceAliases(String)
using the value returned by getQuerySpaceUid()
.
This relies on reference lookups against the EntityReference instances, therefore this allows representation of the circularity but with a little protection against potential stack overflows. This is unfortunately still a cyclic graph. An alternative approach is to make the graph acyclic (DAG) would be to follow the process I adopted in the original HQL Antlr v3 work with regard to always applying an alias to the "persister reference", even where that meant creating a generated, unique identifier as the alias. That allows other parts of the tree to refer to the "persister reference" by that alias without the need for potentially cyclic graphs (think ALIAS_REF in the current ORM parser). Those aliases can then be mapped/catalogued against the "persister reference" for retrieval as needed.
Modifier and Type | Method and Description |
---|---|
String |
getQuerySpaceUid()
The query space UID returned using
getQuerySpaceUid() must
be the same as returned by #getTargetEntityReference()#getQuerySpaceUid() |
EntityReference |
getTargetEntityReference()
Get the targeted EntityReference
|
getEntityPersister, getIdentifierDescription
getBidirectionalEntityReferences, getFetches, getPropertyPath, resolveEntityReference
EntityReference getTargetEntityReference()
Get the targeted EntityReference
String getQuerySpaceUid()
The query space UID returned using getQuerySpaceUid()
must
be the same as returned by #getTargetEntityReference()#getQuerySpaceUid()
getQuerySpaceUid
in interface EntityReference
getQuerySpaceUid
in interface FetchSource
Copyright © 2001-2018 Red Hat, Inc. All Rights Reserved.