[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-657) @Enumerated(value=EnumType.STRING) for Maps (java.util.EnumMap) ?

[Michael Grünewald (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_28008 ] 

Michael Grünewald commented on ANN-657:
---------------------------------------

Hi, 

a little bit more flexible way, would be to define an method which is accessed before the mapping and only the result is mapped.
E.g.  for enums the method would be  "name" (public final String name()) or "ordinal" (public final int ordinal())
So an @MapKey (action=name) would cause that name is called on every key and mapped as String.

This would be also usefull if the key is an class which should not be mapped to the db.
So "hashcode"  or  toString could be another example for an usage of that.

I'm not quite sure if there any other useful situations out there, but at least it would be very flexible and powerful. On the other hand the "enumerated" would be more straight forward.

Greetings Michael

By the way, same should be aplied to @MapKeyManyToMany.

> @Enumerated(value=EnumType.STRING) for Maps (java.util.EnumMap) ?
> -----------------------------------------------------------------
>
>                 Key: ANN-657
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-657
>             Project: Hibernate Annotations
>          Issue Type: Improvement
>    Affects Versions: 3.3.0.ga
>         Environment: hibernate 3.2.4.sp1; PostgresSql 8.2
>            Reporter: Michael Grünewald
>            Priority: Minor
>
> Hi, 
> I faced the problem, that I can't enforce a String-Mapping for an enum type key of an Map.
> E.g.:
> Map<? extends Enum<?>, String> 
> I would suppose to use an attribute for @MapKey to do that.
> E.g.: @MapKey (enumerated=EnumType.STRING)
> Please read the forum entry for  more informations.
> http://forum.hibernate.org/viewtopic.php?t=97827
> Greetings Michael

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