public ImmutableSortedSet<Pair<T, Integer>> zipWithIndex() {
Comparator<? super T> comparator = this.comparator();
if (comparator == null) {
TreeSortedSet<Pair<T, Integer>> pairs =
TreeSortedSet.newSet(
Comparators.<Pair<T, Integer>, T>byFunction(
Functions.<T>firstOfPair(), Comparators.<T>naturalOrder()));
return Iterate.zipWithIndex(this, pairs).toImmutable();
}
return Iterate.zipWithIndex(
this, TreeSortedSet.<Pair<T, Integer>>newSet(Comparators.<T>byFirstOfPair(comparator)))
.toImmutable();
}
public <S> ImmutableSortedSet<Pair<T, S>> zip(Iterable<S> that) {
Comparator<? super T> comparator = this.comparator();
if (comparator == null) {
TreeSortedSet<Pair<T, S>> pairs =
TreeSortedSet.newSet(
Comparators.<Pair<T, S>, T>byFunction(
Functions.<T>firstOfPair(), Comparators.<T>naturalOrder()));
return Iterate.zip(this, that, pairs).toImmutable();
}
return Iterate.zip(
this, that, TreeSortedSet.<Pair<T, S>>newSet(Comparators.<T>byFirstOfPair(comparator)))
.toImmutable();
}