/** Removes all children. */
@Override
public void removeChildren() {
final long removed = childrenCost();
if (removed != 0) {
SelectedNode parent = this;
do {
parent.cost -= removed;
} while ((parent = (SelectedNode) parent.getParent()) != null);
}
super.removeChildren();
}
/**
* Adds the given tile as a child of this tile.
*
* @throws ClassCastException if the given child is not an instance of {@code SelectedNode}. This
* is an intentional restriction in order to avoid more subtile bugs later.
*/
@Override
public void addChild(final TreeNode child) throws ClassCastException {
super.addChild(child);
if (child != null) {
final long added = ((SelectedNode) child).cost;
if (added != 0) {
SelectedNode parent = this;
do {
parent.cost += added;
} while ((parent = (SelectedNode) parent.getParent()) != null);
}
}
}