Purging Messsages

Would it be acceptable to use this method to purge old messages from an 
AdministeredTopic with non-durable subscribers?
It's use of internal exolab classes is a bit sticky, but ...

<pre>
                  import org.exolab.jms.persistence;

                  java.sql.Connection c = DatabaseService.getConnection();
                  Messages m = Messages.instance();

                  Vector v = m.getUnprocessedMessages(c);

                  int x = 0;
                  for (Enumeration e = v.elements(); e.hasMoreElements(); )
                  {
                     Message mm = (Message)e.nextElement();

                     long time = mm.getJMSTimestamp();

                     // 30 minutes.
                     if (time < (now - 1800000))
                     {
                        m.remove(c, mm.getJMSMessageID());
                        x++;
                     }
                  }
                  c.commit();
                  SQLHelper.close(c);
</pre>
I ask because if this isn't the way - is there another that doesnt 
require intimate knowledge of the datastore? 
(I could use the Connection directly and call SQL on it - but is this 
going to hit me too?! )

Ken