Sorted.
NaServer s = new NaServer("PHYSICAL-FILER-NAME", 1 , 7);
s.setServerType(NaServer.SERVER_TYPE_FILER);
s.setTransportType(NaServer.TRANSPORT_TYPE_HTTPS);
s.setPort(443);
s.setStyle(NaServer.STYLE_LOGIN_PASSWORD);
s.setAdminUser("user", "password");
s.setVfilerTunneling("VFILER-NAME");