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https://issues.apache.org/cayenne/browse/CAY-455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrus Adamchik closed CAY-455.
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> JPA Mapping Descriptor bean and XML loader for it
> -------------------------------------------------
>
> Key: CAY-455
> URL: https://issues.apache.org/cayenne/browse/CAY-455
> Project: Cayenne
> Issue Type: Task
> Components: Cayenne JPA
> Affects Versions: JPA 1.0
> Reporter: Andrus Adamchik
> Assignee: Andrus Adamchik
> Fix For: JPA 1.0
>
>
> JPA spec defines a schema for the entity mapping descriptor (aka orm.xml). We
> need to handle it. I see the following subtasks involved:
> 1. Create a class that is able to store all information defined in the schema
> (even if some fields currently have no analogues in Cayenne). This class does
> not depend on cayenne core, so it should be placed in
> "org.objectstyle.cayenne.jpa"
> 2. Create a loader from XML. Use Cayenne XMLDecoder if possible?
> 3. Create a converter between orm.xml descriptor class and DataMap.
> Note: another way to load an ORM descriptor bean is by inspecting managed
> class annotations (CAY-456). Note that XML descriptor infor overrides
> annotations, so the loader should be able to work with an existing
> desctiptor, updating it from XML data.
> A quote from spec:
> "The XML descriptor is intended to serve as both analternative and an
> overriding mechanism
> to the use of Java language metadata annotations."
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