I need to write a custom criterion to check for inheritance. My desire is to use it like this:



Basically, what I need to do is:

1. Determine the inheritance strategy (table-per-subclass, discriminator, or mixed)
2. Get the discriminator column if present
3. Get the discriminator values and/or joined tables involved
4. Identify the discriminator values represent the specified class or any of its subclasses (as defined in the mapping)
5. Construct a SQL query string (where discriminator in (x, y, z, ...) or where id in (select id from joined_table))

I'm having some trouble with 1-3. I've looked through the API documentation at CriteriaQuery, SessionFactoryImplementor, and EntityPersister and I haven't seen any methods resembling hasDiscriminator( ) or getDiscriminator( ) or getJoinedTable( ). Am I looking in the right place? If not, where should I be looking? Also, are custom Criterion implementations future-proof, or are they tied to implementions (vice interfaces)?

Thanks in advance,

- Jesse

I think I found what I was looking for:



Question: what goes where I put ???. The parameter is entityName... is that the Java class name of the entity that I am interested in? Second, loadable has a method call getSubclassForDiscriminatorValue( )... is there a corresponding getDiscriminatorValueForSubclass( ) method anywhere?

Am I on the right track?

- Jesse