public static String backTrack(DLNAResource start, int stop) {
if (start == null) return null;
if (Channels.save()) // compensate for save
start = start.getParent();
if (stop == 0) return start.getName();
int i = 0;
DLNAResource curr = start;
while (i < stop) {
curr = curr.getParent();
i++;
if (curr instanceof Channel) {
curr = null;
break;
}
}
if (curr != null) return curr.getName();
return null;
}
