protected List<ContentNode> doInBackground() throws Exception {
// From the node, find the "User Object" and then the content
// node from the user object
if (node.getUserObject() instanceof TreeNodeHolder) {
TreeNodeHolder holder = (TreeNodeHolder) node.getUserObject();
ContentNode contentNode = (ContentNode) holder.contentNode;
if (contentNode instanceof ContentCollection) {
return ((ContentCollection) contentNode).getChildren();
}
}