ParsersUtils.java

/**
   * Checks all elements in {@code metadata} array to see if all
   * the components are valid.
   * Ex: If {@code jobIdRegex} is "^application_\\d+_\\d+$",
   * metadata = [application_1541469337545_0031, 1542325695566, 1542325733637, user1, FAILED] -> true
   * metadata = [application_1541469337545_0031, 1542325695566, 1542325733637, user2, succeeded] -> false
   * because status should be upper-cased.
   * If an element of the array doesn't satisfy its corresponding condition, the metadata is invalid.
   * @param metadata A String array with metadata components.
   * @param jobIdRegex Regular expression string to validate metadata.
   * @return true if all the metadata are in proper format, false otherwise.
   */
  @VisibleForTesting
  static boolean isValidHistFileName(String[] metadata, String jobIdRegex) {
    if (metadata.length != 5) {
      LOG.error("Missing fields in metadata");
      return false;
    }
    return metadata[0].matches(jobIdRegex)
        && metadata[1].matches("\\d+")
        && metadata[2].matches("\\d+")
        && metadata[3].matches(metadata[3].toLowerCase())
        && metadata[4].equals(metadata[4].toUpperCase());
  }