private Node addTreeNode(Entity item, Node parentNode) {
Node node = new Node(new VisLabel(parentNode == null ? "root" : getItemName(item)));
MainItemComponent mainItemComponent = ComponentRetriever.get(item, MainItemComponent.class);
node.setObject(mainItemComponent.uniqueId);
if (parentNode != null) {
parentNode.add(node);
} else {
tree.add(node);
}
return node;
}
