*
* @return the selection tree
*/
protected SelectionTree newTree(SelectedFactoryNode... nodes) {
SelectionTree st = new SelectionTree(null);
st.addVertices(nodes);
if (nodes.length == 0) {
return st;
}
st.addEdge(e(st.getRoot(), nodes[0]));
for (int i = 1; i < nodes.length; i++) {