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