docs: @Override
    public ISBNParsedResult parse(Result result) {
      BarcodeFormat format = result.getBarcodeFormat();
      if (format != BarcodeFormat.EAN_13) {
        return null;
      }
      String rawText = getMassagedText(result);
      int length = rawText.length();
      if (length != 13) {
        return null;
      }
      if (!rawText.startsWith("978") && !rawText.startsWith("979")) {
        return null;
      }
     
      return new ISBNParsedResult(rawText);
    }