public int run()

in ratis-shell/src/main/java/org/apache/ratis/shell/cli/AbstractShell.java [59:110]
42 lines of code
8 McCabe index (conditional complexity)

  public int run(String... argv) {
    if (argv.length == 0) {
      printUsage();
      return -1;
    }

    // Sanity check on the number of arguments
    String cmd = argv[0];
    Command command = mCommands.get(cmd);

    if (command == null) {
      // Unknown command (we didn't find the cmd in our dict)
      System.err.printf("%s is an unknown command.%n", cmd);
      printUsage();
      return -1;
    }

    // Find the inner-most command and its argument line.
    CommandLine cmdline;
    try {
      String[] currArgs = Arrays.copyOf(argv, argv.length);
      while (command.hasSubCommand()) {
        if (currArgs.length < 2) {
          throw new IllegalArgumentException("No sub-command is specified");
        }
        if (!command.getSubCommands().containsKey(currArgs[1])) {
          throw new IllegalArgumentException("Unknown sub-command: " + currArgs[1]);
        }
        command = command.getSubCommands().get(currArgs[1]);
        currArgs = Arrays.copyOfRange(currArgs, 1, currArgs.length);
      }
      currArgs = Arrays.copyOfRange(currArgs, 1, currArgs.length);

      cmdline = command.parseAndValidateArgs(currArgs);
    } catch (IllegalArgumentException e) {
      // It outputs a prompt message when passing wrong args to CLI
      System.out.println(e.getMessage());
      System.out.println("Usage: " + command.getUsage());
      System.out.println(command.getDescription());
      LOG.error("Invalid arguments for command {}:", command.getCommandName(), e);
      return -1;
    }

    // Handle the command
    try {
      return command.run(cmdline);
    } catch (Exception e) {
      System.out.println(e.getMessage());
      LOG.error("Error running" + Arrays.stream(argv).reduce("", (a, b) -> a + " " + b), e);
      return -1;
    }
  }