public void build(EventSet e) {
for (int i = 0; i < e.size(); i++) {
Event start = e.eventAt(i);
if (!root.isEventInLevel(start)) {
insertAtRoot(start, e, i);
} else {
insertBelowRoot(start, e, i);
}
}
root.key = null;
}
void addEventToLevel(Event e) {
XEDictionaryNode node = new XEDictionaryNode();
node.key = e;
child.put(e, node);
}
