// ----------------------------------------------------------------------
// SelectClusterMember():
//
// Select a potential member (an individual in the front Fl) and associate
// it with the reference point.
//
// Check the last two paragraphs in Section IV-E in the original paper.
// ----------------------------------------------------------------------
S SelectClusterMember(ReferencePoint<S> rp) {
S chosen = null;
if (rp.HasPotentialMember()) {
if (rp.MemberSize() == 0) // currently has no member
{
chosen = rp.FindClosestMember();
} else {
chosen = rp.RandomMember();
}
}
return chosen;
}
int FindNicheReferencePoint() {
// find the minimal cluster size
int min_size = Integer.MAX_VALUE;
for (ReferencePoint<S> referencePoint : this.referencePoints)
min_size = Math.min(min_size, referencePoint.MemberSize());
// find the reference points with the minimal cluster size Jmin
List<Integer> min_rps = new ArrayList<>();
for (int r = 0; r < this.referencePoints.size(); r += 1) {
if (this.referencePoints.get(r).MemberSize() == min_size) {
min_rps.add(r);
}
}
// return a random reference point (j-bar)
return min_rps.get(
min_rps.size() > 1 ? JMetalRandom.getInstance().nextInt(0, min_rps.size() - 1) : 0);
}
