private boolean isHardcodedFilenameString(String string) {
      if (string == null) {
        return false;
      }
      if (string.indexOf(SLASH) == -1 &&
          string.indexOf(BACKSLASH) == -1) {
        return false;
      }
      for (int i = 0, length = string.length(); i < length; i++) {
        char c = string.charAt(i);
        if (c == '\b' || c == '\n' || c == '\t' || c == '\r' || c == '\f') {
          return false;
        }
      }
      if (OSAgnosticPathUtil.startsWithWindowsDrive(string)) {
        return true;
      }
      if (isXMLString(string)) {
        return false;
      }
      if (isDateFormatString(string)) {
        return false;
      }
      if (isURLString(string)) {
        return false;
      }
      if (isMediaTypeString(string)) {
        return false;
      }
      return !isTimeZoneIdString(string);
    }
private boolean isHardcodedFilenameString(String string)