docs: public Attribute getObjectClassAttribute(String dn) {
          if (iObjectClassAttrs.length == 1 || dn == null) {
              return iObjectClassAttrs[0];
          } else {
  
              String[] rdns = LdapHelper.getRDNAttributes(dn);
  
              for (int i = 0; i < iRDNAttrs.length; i++) {
                  String[] attrs = iRDNAttrs[i];
                  for (int j = 0; j < attrs.length; j++) {
                      for (int k = 0; k < attrs.length; k++) {
                          if (attrs[j].equals(rdns[k])) {
                              return iObjectClassAttrs[i];
                          }
                      }
                  }
              }
          }
          return null;
      }