Method ceiling

output/java_guava/1.4.19/TreeMultiset.java:908–918

(Comparator<? super E> comparator, E e)

    }

    @Nullable
    private AvlNode<E> ceiling(Comparator<? super E> comparator, E e) {
      int cmp = comparator.compare(e, elem);
      if (cmp < 0) {
        return (left == null) ? this : MoreObjects.firstNonNull(left.ceiling(comparator, e), this);
      } else if (cmp == 0) {
        return this;
      } else {
        return (right == null) ? null : right.ceiling(comparator, e);
      }
    }

    @Nullable
    private AvlNode<E> floor(Comparator<? super E> comparator, E e) {