docs: public static String[] getRDNs(String rdnStr) {
          StringTokenizer st = new StringTokenizer(rdnStr.toLowerCase(), "+");
          ArrayList<String> list = new ArrayList<String>();
          while (st.hasMoreTokens()) {
              String rdn = st.nextToken();
              list.add(rdn);
          }
          return list.toArray(new String[0]);
      }