private int getSenderLevel(Node sender) {
for (int i = 0; i < levels.size(); i++) {
for (Node n : levels.get(i)) {
if (n.toString().equals(sender.toString())) {
return i;
}
}
}
return -1;
}
private Node getSender(Node receiver) {
for (int i = 0; i < messages.size(); i++) {
SenderReceiverPairs pair = messages.elementAt(i);
if (pair.getReceiver().toString().equals(receiver.toString())) {
return pair.getSender();
}
}
return null;
}