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https://issues.apache.org/jira/browse/JDO-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185696#comment-13185696
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Craig L Russell commented on JDO-702:
-------------------------------------
Not clear that we need to update the company model. A stand alone model for
just this feature would work for me.
The advantage of the company model is that there is a lot of infrastructure
already written. And changing the Address classes/interfaces probably isn't
best because the most common case for Address is embedded without subclasses.
So probably another model is needed anyway. Or create another package outside
the company model but use the company infrastructure (e.g. the completeness
test).
You also want to make sure that the query features (cast, relationships from
embedded subtypes, projections of embedded types) work properly.
> Support for specification of embedded inherited objects
> -------------------------------------------------------
>
> Key: JDO-702
> URL: https://issues.apache.org/jira/browse/JDO-702
> Project: JDO
> Issue Type: New Feature
> Components: api, specification, tck
> Reporter: Andy Jefferson
> Attachments: JDO-702.patch
>
>
> While JDO2+ allows specification of embedded objects stored with primary
> objects, it doesn't have any specific way of specifying the embedded object
> as being inherited and how you would persist it. In particular there is no
> way to define a discriminator (column) for the embedded object. If we have an
> example from the JDO spec, and if we have a subclass of Address as also
> persistable, then we need to specify the discriminator for "primaryAddress"
> field.
> <class name="Employee" table="EMP">
> ...
> <!-- field type is Address -->
> <field name="primaryAddress">
> <embedded null-indicator-column="PADDR_STREET">
> <discriminator column="PADDR_DISCRIM"/>
> <field name="street" column="PADDR_STREET"/>
> <field name="city" column="PADDR_CITY"/>
> <field name="state" column="PADDR_STATE"/>
> <field name="zip" column="PADDR_ZIPCODE"/>
> </embedded>
> </field>
> </class>
> So the XSD/DTD need updates to allow <discriminator> under <embedded>, the
> JDO Metadata API needs to allow this also, and the @Embedded annotation needs
> a "discriminator" attribute adding.
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