if ( ! comparators.containsKey( oid ) )
if ( comparators.containsKey( oid ) )
    public Comparator lookup( String oid ) throws NamingException    {        if ( ! comparators.containsKey( oid ) )        {            Comparator c = ( Comparator ) comparators.get( oid );            monitor.lookedUp( oid, c );            return c;        }        NamingException e = new NamingException( "Comparator not found for OID" );        monitor.lookupFailed( oid, e );        throw e;    }