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Date: Sat, 7 Jan 2012 14:40:39 +0000 (UTC)
From: "Andy Jefferson (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (JDO-702) Support for specification of embedded
 inherited objects
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    [ https://issues.apache.org/jira/browse/JDO-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181973#comment-13181973 ] 

Andy Jefferson commented on JDO-702:
------------------------------------

Sure, but what form does this testcase take? I was thinking of a simple subclass of Address, however a change to the company model seems to imply creating duplicated interfaces and implementations across various packages ... not just company, but also companyAnnotatedFC, companyAnnotated JPA, companyAnnotatedPC, companyAnnotatedPI etc. All I want is a subclass and a way of instantiating it (e.g CompanyFactory.newXXXAddress), without having to dup it many times. What is the minimum that this company model will accept ?
                
> 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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