How to use

copyOf

method

in

java.util.Set

private Set<String> prefixAndPostfix(String title) {
  for (String separator : GroupTitleUtils.getGroupSeparators()) {
    String[] splittedTitle = title.split(separator);
    if (splittedTitle.length > 1) {
      String prefix = splittedTitle[0];
      String postfix = splittedTitle[splittedTitle.length - 1];
      return Set.copyOf(asList(prefix, postfix));
    }
  }
  return Set.of(title);
}

  /** @return Nodes of type host, in any state, that have no children with allocation */
  static Set<Node> candidates(NodeList nodes) {
    Map<String, Node> hostsByHostname = nodes.nodeType(NodeType.host)
        .asList().stream()
        .collect(Collectors.toMap(Node::hostname, Function.identity()));

    nodes.asList().stream()
        .filter(node -> node.allocation().isPresent())
        .flatMap(node -> node.parentHostname().stream())
        .distinct()
        .forEach(hostsByHostname::remove);

    return Set.copyOf(hostsByHostname.values());
  }
}