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

[Steve Ebersole (JIRA)]

Allow generic handling of any Hibernate type for post-insert generated identifiers
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                 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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