[hibernate-issues] [Hibernate-JIRA] Created: (HBX-1034) Need a way to have a "native-if-not-assigned" IdentifierGenerator

[Paul Shemansky (JIRA)]

Need a way to have a "native-if-not-assigned" IdentifierGenerator
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                 Key: HBX-1034
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HBX-1034
             Project: Hibernate Tools
          Issue Type: New Feature
            Reporter: Paul Shemansky
         Attachments: hibernate-native-or-assigned-patch.diff

NOTE: I believe I have explored every documented possibility in achieving the desired functionality.  If I have misused Hibernate, the forum, or Google, I humbly apologize and stand to be corrected.

With that being said, I believe this may be desired:
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By setting the Hibernate configuration's primary key column to use a "native" implementation, Hibernate ALWAYS generates the entity's id when a save() is being called. There is no way to "override" the generated id.

The attached patch creates an IdentityGenerator which allows a programmer to override the "generated" id, with an "assigned" id at runtime simply by setting the primary key property.

The patch also changes the IdentifierGeneratorFactory to allow the short-name selection of the generator via a configuration file.

Furthermore, the English documentation is patched to describe the generator, accordingly.

Possibly related issues and reference material:

The documentation does not seem to provide a solution for a native-if-not-assigned generator; you seem to only have one, or the other:
http://www.hibernate.org/hib_docs/reference/en/html/mapping.html#mapping-declaration-id-generator

A scenario which describes a typical use case that warrants the proposed new feature:
http://forum.hibernate.org/viewtopic.php?t=982560&highlight=native+id+generator



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