Change openfire source code: when deleting collection node to place childs into the root node or a specified node

What would be the right parameter to change the parent of the node to a root when deleting a collection or leaf node in CollectionNode.java?

protected void deletingNode() {

// Update child nodes to use the parent node of this node as the new parent node

for (Node node : getNodes()) {

node.changeParent(parent);

}

}

Would this be right?

protected void deletingNode() {

// Update child nodes to use the parent node of this node as the new parent node

for (Node node : getNodes()) {

node.changeParent("");

}

}

Or how to move a deleted node under a specified node like Orphans:

protected void deletingNode() {

// Update child nodes to use the parent node of this node as the new parent node

for (Node node : getNodes()) {

node.changeParent(“Orphans”);

}

}