public String pathLabel() {
if (parentEdge != null) {
StringBuilder sb = new StringBuilder(parentEdge.headNode.pathLabel());
for (int i = 0; i < parentEdge.length(); i++) {
sb.append(parentEdge.getChar(i));
}
return sb.toString();
} else {
return "";
}
}
public void addEdge(TreeEdge e) {
if (e.start() == e.string.length() - 1) {
int key = e.string.getIndex();
if (terminalEdges.containsKey(key)) {
throw new IllegalArgumentException();
}
e.headNode = this;
terminalEdges.put(key, e);
} else {
char key = e.getChar(0);
if (childEdges.containsKey(key)) {
throw new IllegalArgumentException();
}
e.headNode = this;
childEdges.put(key, e);
}
}