void setNodeList()

in wrapper/src/main/java/software/amazon/jdbc/PluginServiceImpl.java [545:583]
30 lines of code
10 McCabe index (conditional complexity)

  void setNodeList(@Nullable final List<HostSpec> oldHosts,
      @Nullable final List<HostSpec> newHosts) {

    final Map<String, HostSpec> oldHostMap = oldHosts == null
        ? new HashMap<>()
        : oldHosts.stream().collect(Collectors.toMap(HostSpec::getUrl, (value) -> value));

    final Map<String, HostSpec> newHostMap = newHosts == null
        ? new HashMap<>()
        : newHosts.stream().collect(Collectors.toMap(HostSpec::getUrl, (value) -> value));

    final Map<String, EnumSet<NodeChangeOptions>> changes = new HashMap<>();

    for (final Entry<String, HostSpec> entry : oldHostMap.entrySet()) {
      final HostSpec correspondingNewHost = newHostMap.get(entry.getKey());
      if (correspondingNewHost == null) {
        // host deleted
        changes.put(entry.getKey(), EnumSet.of(NodeChangeOptions.NODE_DELETED));
      } else {
        // host maybe changed
        final EnumSet<NodeChangeOptions> hostChanges = compare(entry.getValue(), correspondingNewHost);
        if (!hostChanges.isEmpty()) {
          changes.put(entry.getKey(), hostChanges);
        }
      }
    }

    for (final Entry<String, HostSpec> entry : newHostMap.entrySet()) {
      if (!oldHostMap.containsKey(entry.getKey())) {
        // host added
        changes.put(entry.getKey(), EnumSet.of(NodeChangeOptions.NODE_ADDED));
      }
    }

    if (!changes.isEmpty()) {
      this.allHosts = newHosts != null ? newHosts : new ArrayList<>();
      this.pluginManager.notifyNodeListChanged(changes);
    }
  }