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Java 5.0 enum as "map-key"

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Felix Cat

Post subject: Java 5.0 enum as "map-key"

Posted: Mon Jul 30, 2007 12:51 pm

Newbie

Joined: Tue Jul 24, 2007 9:05 am
Posts: 2
Location: Paris, France

Hibernate version: 3.2.4

Hi all,

I am trying to use an enum type as map-key but cannot figure out how to do this.

I know how to map an enum using the GenericEnumUserType. Bu this does not work here because the <map-key> element does not allow an nested <type> element.

Do I have to persist the enum class in a separate table? If yes, how to achieve this using GenericEnumUserType? Or do I have to write a custom class.

Thanks for your help!

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thatmikewilliams

Post subject:

Posted: Mon Jul 30, 2007 2:01 pm

Expert

Joined: Fri Jul 13, 2007 8:18 am
Posts: 370
Location: london

Create a type for your Enum before the class definition and refer to this type in the map-key.

Code:

<hibernate-mapping package="test.mapwithusertypekey">

    <typedef name="map_key_enum_type" class="test.mapwithusertypekey.GenericEnumUserType">
        <param name="enumClass">test.mapwithusertypekey.MapKeyEnum</param>
    </typedef>

    <class name="Parent" table="mwutk_parent">
        <map name="valuesMap" table="values_map">
            <key column="parent_id"/>
            <map-key column="map_key" type="map_key_enum_type"/>
            <element column="map_value" type="string"/> 
        </map>
...
    </class>

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