private List<Integer> getNeighbourhood(final E e) {
int currentIteration = getIteration();
if (currentIteration > lastIteration || nHoods == null || perCall) {
lastIteration = currentIteration;
nHoods =
getNeighbourhoods(distanceMeasure, radius, neighbourhoodSize)
.f(
P.p(
List.<Entity>iterableList((java.util.List<Entity>) entities).zipIndex(),
List.<List<Integer>>nil()));
}
final int index = entities.indexOf(e);
return nHoods
.find(
new F<List<Integer>, Boolean>() {
@Override
public Boolean f(List<Integer> a) {
return a.exists(Equal.intEqual.eq(index));
}
})
.orSome(List.single(index));
}
/**
* Returns a nonempty list with the elements of this vector.
*
* @return a nonempty list with the elements of this vector.
*/
public NonEmptyList<A> toNonEmptyList() {
return NonEmptyList.nel(_1(), List.single(_2()));
}