private void insertSelfReference(final ExplorerTreeNode child) {
        final ExplorerTreePath newPath = new ExplorerTreePath(child.getId(), child.getId(), 0, -1);
        create(newPath);
    }
Get the root node containing a particular node, or the node itself if it is a root node.
stroom-explorer/stroom-explorer-impl-db/src/main/java/stroom/explorer/impl/db/ExplorerTreeDaoImpl.java