public static void main()

in hbase-table-reporter/src/main/java/org/apache/hbase/reporter/TableReporter.java [463:543]
70 lines of code
15 McCabe index (conditional complexity)

  public static void main(String [] args)
    throws ParseException, IOException, ExecutionException, InterruptedException {
    Options options = new Options();
    Option help = Option.builder("h").longOpt("help").
        desc("output this help message").build();
    options.addOption(help);
    Option limitOption = Option.builder("l").longOpt("limit").hasArg().build();
    options.addOption(limitOption);
    Option fractionOption = Option.builder("f").longOpt("fraction").hasArg().build();
    options.addOption(fractionOption);
    Option regionOption = Option.builder("r").longOpt("region").hasArg().build();
    options.addOption(regionOption);
    Option threadsOption = Option.builder("t").longOpt("threads").hasArg().build();
    options.addOption(threadsOption);
    Option configOption = Option.builder("D").valueSeparator().argName("property=value").
        hasArgs().build();
    options.addOption(configOption);
    // Parse command-line.
    CommandLineParser parser = new DefaultParser();
    CommandLine commandLine = parser.parse(options, args);

    // Process general options.
    if (commandLine.hasOption(help.getOpt()) || commandLine.getArgList().isEmpty()) {
      usage(options);
      System.exit(0);
    }

    int limit = -1;
    String opt = limitOption.getOpt();
    if (commandLine.hasOption(opt)) {
      limit = Integer.parseInt(commandLine.getOptionValue(opt));
    }
    double fraction = 1.0;
    opt = fractionOption.getOpt();
    if (commandLine.hasOption(opt)) {
      fraction = Double.parseDouble(commandLine.getOptionValue(opt));
      if (fraction > 1 || fraction <= 0) {
        usage(options, "Bad fraction: " + fraction + "; fraction must be > 0 and < 1");
        System.exit(0);
      }
    }
    int threads = 1;
    opt = threadsOption.getOpt();
    if (commandLine.hasOption(opt)) {
      threads = Integer.parseInt(commandLine.getOptionValue(opt));
      if (threads > 1000 || threads <= 0) {
        usage(options, "Bad thread count: " + threads + "; must be > 0 and < 1000");
        System.exit(0);
      }
    }

    String encodedRegionName = null;
    opt = regionOption.getOpt();
    if (commandLine.hasOption(opt)) {
      encodedRegionName = commandLine.getOptionValue(opt);
    }

    Configuration configuration = HBaseConfiguration.create();
    opt = configOption.getOpt();
    if (commandLine.hasOption(opt)) {
      // If many options, they all show up here in the keyValues
      // array, one after the other.
      String [] keyValues = commandLine.getOptionValues(opt);
      for (int i = 0; i < keyValues.length;) {
        configuration.set(keyValues[i], keyValues[i + 1]);
        i += 2; // Skip over this key and value to next one.
      }
    }

    // Now process commands.
    String [] commands = commandLine.getArgs();
    if (commands.length < 1) {
      usage(options, "No TABLENAME: " + Arrays.toString(commands));
      System.exit(1);
    }

    String now = Instant.now().toString();
    for (String command : commands) {
      sketch(configuration, command, limit, fraction, threads, now, encodedRegionName);
    }
  }