/**
  * Method to load the target object of thesaurus target
  *
  * @return CActeNGAP|CCodeCCAM|CCodeCIM10
  */
 function loadRefTarget()
 {
     if ($this->object_class && $this->object_id) {
         switch ($this->object_class) {
             case "CCodeCIM10":
                 $object = new CCodeCIM10();
                 $object->code = $this->object_id;
                 $object->loadLite();
                 $this->_ref_target = $object;
                 break;
             case "CCodeCCAM":
                 $object = new CCodeCCAM($this->object_id);
                 $object->load();
                 $this->_ref_target = $object;
                 break;
             case "CActeNGAP":
                 $object = new CActeNGAP();
                 $object->code = $this->object_id;
                 $object->loadMatchingObject();
                 $this->_ref_target = $object;
                 break;
             case "CMedicamentClasseATC":
                 $object = new CMedicamentClasseATC();
                 $niveau = $object->getNiveau($this->object_id);
                 $object->loadClasseATC($niveau, $this->object_id);
                 $this->_ref_target = $object;
                 break;
             default:
                 // nothing to do
                 break;
         }
     }
     return $this->_ref_target;
 }