class TypeContributorImpl implements TypeContributor {

// all pseudocode
    @Override
    public void contribute(TypeContributions typeContributions, ServiceRegistry serviceRegistry) {
        final Dialect dialect = serviceRegistry.getService( JdbcServices.class ).getDialect();

       for ( Type type ... // annotated type classes? ) {
           if ( dialect.equals( type.getDialectForContribution() ) {
                    typeContributions.contributeType( type );
           }
       }
    }
}