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From "Andy Jefferson (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JDO-702) Support for specification of embedded inherited objects
Date Thu, 24 Nov 2011 16:25:40 GMT
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


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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