public int compare(Object obj1, Object obj2) {
   ReferralAppointmentDetailsVo voObj1 = (ReferralAppointmentDetailsVo) obj1;
   ReferralAppointmentDetailsVo voObj2 = (ReferralAppointmentDetailsVo) obj2;
   return direction * (voObj1.compareTo(voObj2, this.caseInsensitive));
 }