public int run()

in hbase-hbck2/src/main/java/org/apache/hbase/HBCK2.java [911:984]
67 lines of code
12 McCabe index (conditional complexity)

  public int run(String[] args) throws IOException {
    // Configure Options. The below article was more helpful than the commons-cli doc:
    // https://dzone.com/articles/java-command-line-interfaces-part-1-apache-commons
    Options options = new Options();
    Option help = Option.builder("h").longOpt("help").desc("output this help message").build();
    options.addOption(help);
    Option debug = Option.builder("d").longOpt("debug").desc("run with debug output").build();
    options.addOption(debug);
    Option quorum = Option.builder("q").longOpt(HConstants.ZOOKEEPER_QUORUM).hasArg().
        desc("hbase ensemble").build();
    options.addOption(quorum);
    Option parent = Option.builder("z").longOpt(HConstants.ZOOKEEPER_ZNODE_PARENT).hasArg()
        .desc("parent znode of hbase ensemble").build();
    options.addOption(parent);
    Option peerPort = Option.builder("p").longOpt(HConstants.ZOOKEEPER_CLIENT_PORT).hasArg()
        .desc("port of hbase ensemble").type(Integer.class).build();
    options.addOption(peerPort);
    Option version = Option.builder("v").longOpt(VERSION).desc("this hbck2 version").build();
    options.addOption(version);
    Option skip = Option.builder("s").longOpt("skip").
        desc("skip hbase version check (PleaseHoldException)").build();
    options.addOption(skip);

    // Parse command-line.
    CommandLineParser parser = new DefaultParser();
    CommandLine commandLine;
    try {
      commandLine = parser.parse(options, args, true);
    } catch (ParseException e) {
      showErrorMessage(e.getMessage());
      return EXIT_FAILURE;
    }
    // Process general options.
    if (commandLine.hasOption(version.getOpt())) {
      System.out.println(readHBCK2BuildProperties(VERSION));
      return EXIT_SUCCESS;
    }
    if (commandLine.hasOption(help.getOpt()) || commandLine.getArgList().isEmpty()) {
      showUsage(options);
      return EXIT_SUCCESS;
    }
    if (commandLine.hasOption(debug.getOpt())) {
      Configurator.setRootLevel(Level.DEBUG);
    }

    // Build up Configuration for client to use connecting to hbase zk ensemble.
    if (commandLine.hasOption(quorum.getOpt())) {
      getConf().set(HConstants.ZOOKEEPER_QUORUM, commandLine.getOptionValue(quorum.getOpt()));
    }
    if (commandLine.hasOption(peerPort.getOpt())) {
      String optionValue = commandLine.getOptionValue(peerPort.getOpt());
      if (optionValue.matches("[0-9]+")) {
        getConf().setInt(HConstants.ZOOKEEPER_CLIENT_PORT, Integer.parseInt(optionValue));
      } else {
        showErrorMessage(
            "Invalid client port. Please provide proper port for target hbase ensemble.");
        return EXIT_FAILURE;
      }
    }
    if (commandLine.hasOption(parent.getOpt())) {
      String optionValue = commandLine.getOptionValue(parent.getOpt());
      if (optionValue.startsWith("/")) {
        getConf().set(HConstants.ZOOKEEPER_ZNODE_PARENT, optionValue);
      } else {
        showErrorMessage("Invalid parent znode. Please provide proper parent znode of target hbase."
            + " Note that valid znodes must start with \"/\".");
        return EXIT_FAILURE;
      }
    }
    if (commandLine.hasOption(skip.getOpt())) {
      skipCheck = true;
    }
    return doCommandLine(commandLine, options);
  }