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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-615) MetaData specification API
Date Wed, 03 Dec 2008 16:39:44 GMT

    [ https://issues.apache.org/jira/browse/JDO-615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12652846#action_12652846
] 

Andy Jefferson commented on JDO-615:
------------------------------------

If you create JDOMetaData via a services entry and there are more than 1 possible in the CLASSPATH
how does JDOHelper know that it is picking the right one that is compatible with the JDO implementation
that will be used? e.g an app using JDO impl 1 for legacy module 1, and JDO impl 2 for new
module 2.
While all implementations of XXXMetadata will implement it, it is reasonable for a JDO implementation
to only accept its own implementation of the XXXMetadata interfaces to be registered.

Regarding spelling : No comment (to be made by me on American spellings ;-) )

> MetaData specification API
> --------------------------
>
>                 Key: JDO-615
>                 URL: https://issues.apache.org/jira/browse/JDO-615
>             Project: JDO
>          Issue Type: New Feature
>            Reporter: Andy Jefferson
>             Fix For: JDO 2 maintenance release 3
>
>         Attachments: jdometadata-4.patch
>
>
> We can specify MetaData via XML or annotations. The only way missing is via an API. I
propose mirroring the XML structure with interfaces of the form
> public interface MetaData
> {
>     addExtension(String key, String value);
>     removeExtension(String key, String value);
>     ...
> }
> public interface FileMetaData
> {
>     addPackage(PackageMetaData pmd);
>     ...
> }
> public interface PackageMetaData
> {
>     addClass(ClassMetaData cmd)
>     ...
> }
> public interface ClassMetaData
> {
>     addField(FieldMetaData fmd)
>     ...
> }
> public interface FieldMetaData
> {
>     setInheritance(InheritanceMetaData inhmd)
>     ...
> }
> and so on.
> We would then require a method on the PMF to register the metadata.
> If there are no objections to such a feature I'll propose a patch to try to provide all
current JDO2 capabilities.

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