private int getContributorNodeIndex(Class<?> contributorClass) {
    int index = -1;
    List<ServiceViewContributor<?>> contributors = CONTRIBUTOR_EP_NAME.getExtensionList();
    List<ServiceViewContributor<?>> existingContributors = ContainerUtil.map(myRoots, ServiceViewItem::getContributor);
    for (int i = contributors.size() - 1; i >= 0; i--) {
      ServiceViewContributor<?> contributor = contributors.get(i);
      if (!contributorClass.isInstance(contributor)) {
        index = existingContributors.indexOf(contributor);
        if (index == 0) {
          break;
        }
      }
      else {
        break;
      }
    }
    if (index < 0) {
      index = myRoots.size();
    }
    return index;
  }
private int getContributorNodeIndex(Class<?> contributorClass)