/**
* @param set
* @param restrictionSet
* @return intersection of set (ConciseSet) and restrictionSet (if restrictionSet non-null &
* non-empty); otherwise return set
*/
private static ExtendedSet<Integer> intersect(
final ExtendedSet<Integer> set, final Set<Integer> restrictionSet) {
if (restrictionSet != null && !restrictionSet.isEmpty()) {
int prevSize = set.size();
FastSet intersection = new FastSet(set);
intersection.retainAll(restrictionSet);
log.debug(
prevSize != 0
? ("Size saving by retainAll = "
+ (((prevSize - intersection.size()) * 100) / prevSize))
+ "%"
: "");
return intersection;
}
return set;
}
