private NodeRef findOrCreateTree(final String treePath, final FeatureType type) {

    RevTree tree =
        context
            .command(FindOrCreateSubtree.class)
            .setChildPath(treePath)
            .setIndex(true)
            .setParent(workHead)
            .setParentPath(NodeRef.ROOT)
            .call();

    ObjectId metadataId = ObjectId.NULL;
    if (type != null) {
      RevFeatureType revFeatureType = RevFeatureTypeImpl.build(type);
      if (tree.isEmpty()) {
        indexDatabase.put(revFeatureType);
      }
      metadataId = revFeatureType.getId();
    }
    Envelope bounds = SpatialOps.boundsOf(tree);
    Node node =
        Node.create(NodeRef.nodeFromPath(treePath), tree.getId(), metadataId, TYPE.TREE, bounds);

    String parentPath = NodeRef.parentPath(treePath);
    return new NodeRef(node, parentPath, ObjectId.NULL);
  }