private static DataNode<ProjectData> convert(@NotNull ProjectSystemId systemId,
                                               @NotNull ExternalProjectPojo rootProject,
                                               @NotNull Collection<? extends ExternalProjectPojo> childProjects) {
    ProjectData projectData = new ProjectData(systemId, rootProject.getName(), rootProject.getPath(), rootProject.getPath());
    DataNode<ProjectData> projectDataNode = new DataNode<>(PROJECT, projectData, null);

    for (ExternalProjectPojo childProject : childProjects) {
      String moduleConfigPath = childProject.getPath();
      ModuleData moduleData = new ModuleData(childProject.getName(), systemId,
                                             "JAVA_MODULE", childProject.getName(),
                                             moduleConfigPath, moduleConfigPath);
      projectDataNode.createChild(MODULE, moduleData);
    }
    return projectDataNode;
  }
private static DataNode<ProjectData> convert(@NotNull ProjectSystemId systemId,
                                               @NotNull ExternalProjectPojo rootProject,
                                               @NotNull Collection<? extends ExternalProjectPojo> childProjects)