}

  @Override
  public Comparator<? super E> comparator() {
    return delegate().comparator();
  }

  @Override
  SortedSet<E> createElementSet() {
    return Collections.unmodifiableSortedSet(delegate().elementSet());
  }

  @Override
  public SortedSet<E> elementSet() {
    return (SortedSet<E>) super.elementSet();
  }

      Collection<E> collection) {
    if (collection instanceof NavigableSet) {
      return Sets.unmodifiableNavigableSet((NavigableSet<E>) collection);
    } else {
      return Collections.unmodifiableSortedSet((SortedSet<E>) collection);
    }
  }

  @Override
  Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
    if (collection instanceof NavigableSet) {

      Collection<E> collection) {
    if (collection instanceof NavigableSet) {
      return Sets.unmodifiableNavigableSet((NavigableSet<E>) collection);
    } else {
      return Collections.unmodifiableSortedSet((SortedSet<E>) collection);
    }
  }

  @Override
  Collection<V> wrapCollection(@ParametricNullness K key, Collection<V> collection) {
    if (collection instanceof NavigableSet) {

    this(Sets.newTreeSet(comparator));
  }

  ImmutableSortedSet(SortedSet<E> sortedDelegate) {
    super(sortedDelegate);
    this.sortedDelegate = Collections.unmodifiableSortedSet(sortedDelegate);
  }

  public Comparator<? super E> comparator() {
    return sortedDelegate.comparator();
  }

  @Override // needed to unify SortedIterable and Collection iterator() methods

      if (collection instanceof NavigableSet) {
        return Sets.unmodifiableNavigableSet((NavigableSet<E>) collection);
      } else if (collection instanceof SortedSet) {
        return Collections.unmodifiableSortedSet((SortedSet<E>) collection);
      } else if (collection instanceof Set) {
        return Collections.unmodifiableSet((Set<E>) collection);
      } else if (collection instanceof List) {

      return Collections.unmodifiableSortedMap(Maps.transformValues(delegate().rowMap(), wrapper));
    }

    @Override
    public SortedSet<R> rowKeySet() {
      return Collections.unmodifiableSortedSet(delegate().rowKeySet());
    }

    private static final long serialVersionUID = 0;
  }

  @SuppressWarnings("unchecked")
  private static <K extends @Nullable Object, V extends @Nullable Object>

    private final SortedSet<E> unmodifiableDelegate;

    UnmodifiableNavigableSet(NavigableSet<E> delegate) {
      this.delegate = checkNotNull(delegate);
      this.unmodifiableDelegate = Collections.unmodifiableSortedSet(delegate);
    }

    @Override
    protected SortedSet<E> delegate() {
      return unmodifiableDelegate;
    }

    @Override
    @CheckForNull