[hibernate-issues] [Hibernate-JIRA] Closed: (HHH-4443) Allow generic handling of any Hibernate type for post-insert generated identifiers

[Steve Ebersole (JIRA)]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-4443?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Ebersole closed HHH-4443.
-------------------------------

    Resolution: Fixed

> Allow generic handling of any Hibernate type for post-insert generated identifiers
> ----------------------------------------------------------------------------------
>
>                 Key: HHH-4443
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4443
>             Project: Hibernate Core
>          Issue Type: Improvement
>          Components: core
>            Reporter: Steve Ebersole
>            Assignee: Steve Ebersole
>             Fix For: 3.5
>
>
> See HB-92 for the original request.  Much of the discussion unfortunately occurred in a private email thread with the original requester, but here is the proposed solution:
> Steve Ebersole <steve at hibernate.org> wrote:
>         The "more correct" solution is along the lines a contract to allow the
>                 type to handle this like you said.  I'm thinking something like an
>                 optional interface for the type to publish that fact:
>                 
>                 public interface ResultSetIdentifierConsumer {
>                    public Serializable consumeIdentifier(ResultSet resultSet);
>                 }
>                 
>                 then IdentifierGeneratorFactory (called IdentifierGeneratorHelper now
>                 btw) can say:
>                 
>                 public static Serializable get(ResultSet rs, Type type) ... {
>                    if ( type instanceof ResultSetIdentifierConsumer ) {
>                        return ( ( ResultSetIdentifierConsumer ) type ).consumeIdentifier( rs );
>                    }
>                 
>                    Class clazz = type.getReturnedClass();
>                    if ( clazz == Long.class ) {
>                        return new Long( rs.getLong( 1 ) );
>                    }
>                    else if ( clazz == Integer.class ) {
>                        return new Integer( rs.getInt( 1 ) );
>                    }
>                    else if ( clazz == Short.class ) {
>                        return new Short( rs.getShort( 1 ) );
>                    }
>                    else if ( clazz == String.class ) {
>                        return rs.getString( 1 );
>                    }
>                    else {
>                 
>                        throw ...
>                    }
>                 }
>                 and you can define a type :
>                 
>                 public class MyCustomLongIdType ... implements ResultSetIdentifierConsumer ... {
>                    public Serializable consumeIdentifier(ResultSet resultSet) {
>                        return new MyCustomLongId( resultSet.getLong( 1 ) );
>                    }
>                    ...
>                 }

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