/** Remove empty subgroups from the subtree. */
public void removeEmptySubgroups() {
if (type != GROUP) {
return;
}
for (Iterator i = children.iterator(); i.hasNext(); ) {
HierarchyNode n = (HierarchyNode) i.next();
n.removeEmptySubgroups();
if (n.getType() == GROUP && n.getChildren().isEmpty()) {
i.remove();
}
}
}
/**
* Add a child to list of children
*
* @param child the child nod to be added
* @throws DataSourceException
*/
public void addChild(HierarchyNode child) throws DataSourceException {
if (type == ELEMENT) {
throw new DataSourceException(
Errors.CANT_ADD_CHILD_TO_ELEMENT, new Object[] {label, child.getLabel()});
}
// add only once
if (!children.contains(child)) {
children.add(child);
}
}