public int run()

in ratis-shell/src/main/java/org/apache/ratis/shell/cli/sh/peer/AddCommand.java [62:100]
37 lines of code
5 McCabe index (conditional complexity)

  public int run(CommandLine cl) throws IOException {
    super.run(cl);
    final Map<RaftPeerId, InetSocketAddress> peersInfo = new HashMap<>();
    List<RaftPeerId> ids;

    if (cl.hasOption(ADDRESS_OPTION_NAME) && cl.hasOption(PEER_ID_OPTION_NAME)) {
      ids = Arrays.stream(cl.getOptionValue(PEER_ID_OPTION_NAME).split(","))
          .map(RaftPeerId::getRaftPeerId).collect(Collectors.toList());
      final List<InetSocketAddress> addresses = Arrays.stream(cl.getOptionValue(ADDRESS_OPTION_NAME).split(","))
          .map(CliUtils::parseInetSocketAddress)
          .collect(Collectors.toList());
      Preconditions.assertSame(ids.size(), addresses.size(), "size");
      for (int i = 0; i < ids.size(); i++) {
        peersInfo.put(ids.get(i), addresses.get(i));
      }
    } else if (cl.hasOption(ADDRESS_OPTION_NAME)) {
      ids = getIds(cl.getOptionValue(ADDRESS_OPTION_NAME).split(","), peersInfo::put);
    } else {
      throw new IllegalArgumentException(
          "Both " + PEER_ID_OPTION_NAME + " and " + ADDRESS_OPTION_NAME + " options are missing.");
    }

    try (RaftClient client = newRaftClient()) {
      final Stream<RaftPeer> remaining = getPeerStream(RaftPeerRole.FOLLOWER);
      final Stream<RaftPeer> adding = ids.stream().map(raftPeerId -> RaftPeer.newBuilder()
          .setId(raftPeerId)
          .setAddress(peersInfo.get(raftPeerId))
          .setPriority(0)
          .build());
      final List<RaftPeer> peers = Stream.concat(remaining, adding).collect(Collectors.toList());
      final List<RaftPeer> listeners = getPeerStream(RaftPeerRole.LISTENER)
          .collect(Collectors.toList());
      System.out.println("New peer list: " + peers);
      System.out.println("New listener list:  " + listeners);
      RaftClientReply reply = client.admin().setConfiguration(peers, listeners);
      processReply(reply, () -> "Failed to change raft peer");
    }
    return 0;
  }