private DefaultMutableTreeNode buildTree(List<MavenProject> projectList) {
        MavenProject[] projects = projectList.toArray(new MavenProject[0]);
        Arrays.sort(projects, new MavenProjectNamer.MavenProjectComparator());

        Map<MavenProject, DefaultMutableTreeNode> projectsToNode = new HashMap<>();
        for (MavenProject mavenProject : projects) {
          projectsToNode.put(mavenProject, new DefaultMutableTreeNode(mavenProject));
        }

        DefaultMutableTreeNode root = new DefaultMutableTreeNode();

        for (MavenProject mavenProject : projects) {
          DefaultMutableTreeNode parent;

          MavenProject aggregator = projectsManager.findAggregator(mavenProject);
          if (aggregator != null) {
            parent = projectsToNode.get(aggregator);
          }
          else {
            parent = root;
          }

          parent.add(projectsToNode.get(mavenProject));
        }

        return root;
      }
private DefaultMutableTreeNode buildTree(List<MavenProject> projectList)