code: public String resultToString(int res) {
          String resultString = "";
          switch (res) {
              case POSSIBLE:
                  resultString = "Certificate to be tried.\n";
                  break;
              case BACK:
                  resultString = "Certificate backed out since path does not "
                      + "satisfy build requirements.\n";
                  break;
              case FOLLOW:
                  resultString = "Certificate satisfies conditions.\n";
                  break;
              case FAIL:
                  resultString = "Certificate backed out since path does not "
                      + "satisfy conditions.\n";
                  break;
              case SUCCEED:
                  resultString = "Certificate satisfies conditions.\n";
                  break;
              default:
                  resultString = "Internal error: Invalid step result value.\n";
          }
          return resultString;
      }
docs: return a string representing the meaning of the result code associated
  with this build step.
  
  @param   res    result code
  @returns String string representing meaning of the result code