protected List<Long> findSortedSrcEdges(Collection<Rule> rules) {
final Set<Long> srcIPs = new HashSet<Long>(rules.size() * 2 + 1, 1);
int srcIPIndex = Util.getDimensionInfoIndex(Util.SRC_IP_INFO);
for (Rule rule : rules) {
RangeDimensionRange property = rule.getProperty(srcIPIndex);
srcIPs.add(property.getStart());
srcIPs.add(property.getEnd());
}
List<Long> ipsSorted = new ArrayList<Long>(srcIPs);
for (Long srcIP : srcIPs) {
ipsSorted.add(srcIP);
}
Collections.sort(ipsSorted);
return ipsSorted;
}