code: public String toRFC1779String(Map<String, String> oidMap) {
          if (assertion.length == 1) {
              return assertion[0].toRFC1779String(oidMap);
          }
  
          StringBuilder sb = new StringBuilder();
          for (int i = 0; i < assertion.length; i++) {
              if (i != 0) {
                  sb.append(" + ");
              }
              sb.append(assertion[i].toRFC1779String(oidMap));
          }
          return sb.toString();
      }
docs: /*
  Returns a printable form of this RDN using the algorithm defined in
  RFC 1779. RFC 1779 attribute type keywords are emitted, as well
  as keywords contained in the OID/keyword map.