Support for specification of embedded inherited objects
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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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