sortedTable = TreeBasedTable.create();
    assertSame(Ordering.natural(), sortedTable.rowComparator());

    sortedTable = TreeBasedTable.create(Collections.reverseOrder(), Ordering.usingToString());
    assertSame(Collections.reverseOrder(), sortedTable.rowComparator());
  }

  public void testColumnComparator() {
    sortedTable = TreeBasedTable.create();
    sortedTable.put("", 42, 'x');

    assertTrue(multimap.get("a") instanceof ImmutableSortedSet);
    assertEquals(
        Collections.reverseOrder(), ((ImmutableSortedSet<Integer>) multimap.get("a")).comparator());
    assertTrue(multimap.get("x") instanceof ImmutableSortedSet);
    assertEquals(
        Collections.reverseOrder(), ((ImmutableSortedSet<Integer>) multimap.get("x")).comparator());

    protected SortedSet<String> create(String[] elements) {
      return ImmutableSortedSet.<String>reverseOrder().add(elements).build().descendingSet();
    }
  }

  public static class ImmutableSortedSetExplicitComparator extends TestStringSetGenerator {

    private static final Comparator<String> STRING_REVERSED = Collections.reverseOrder();

    @Override
    protected SortedSet<String> create(String[] elements) {

    sortedTable = TreeBasedTable.create();
    assertSame(Ordering.natural(), sortedTable.rowComparator());

    sortedTable = TreeBasedTable.create(Collections.reverseOrder(), Ordering.usingToString());
    assertSame(Collections.reverseOrder(), sortedTable.rowComparator());
  }

  public void testColumnComparator() {
    sortedTable = TreeBasedTable.create();
    sortedTable.put("", 42, 'x');

    protected SortedSet<String> create(String[] elements) {
      return ImmutableSortedSet.<String>reverseOrder().add(elements).build().descendingSet();
    }
  }

  public static class ImmutableSortedSetExplicitComparator extends TestStringSetGenerator {

    private static final Comparator<String> STRING_REVERSED = Collections.reverseOrder();

    @Override
    protected SortedSet<String> create(String[] elements) {

    assertTrue(multimap.get("a") instanceof ImmutableSortedSet);
    assertEquals(
        Collections.reverseOrder(), ((ImmutableSortedSet<Integer>) multimap.get("a")).comparator());
    assertTrue(multimap.get("x") instanceof ImmutableSortedSet);
    assertEquals(
        Collections.reverseOrder(), ((ImmutableSortedSet<Integer>) multimap.get("x")).comparator());

    assertThat(Comparators.max(a, b)).isSameInstanceAs(a);
  }

  public void testMinMaxComparator() {
    Comparator<Integer> natural = Ordering.natural();
    Comparator<Integer> reverse = Collections.reverseOrder(natural);
    assertThat(Comparators.min(1, 2, reverse)).isEqualTo(2);
    assertThat(Comparators.min(2, 1, reverse)).isEqualTo(2);
    assertThat(Comparators.max(1, 2, reverse)).isEqualTo(1);

    assertThat(Comparators.max(a, b)).isSameInstanceAs(a);
  }

  public void testMinMaxComparator() {
    Comparator<Integer> natural = Ordering.natural();
    Comparator<Integer> reverse = Collections.reverseOrder(natural);
    assertThat(Comparators.min(1, 2, reverse)).isEqualTo(2);
    assertThat(Comparators.min(2, 1, reverse)).isEqualTo(2);
    assertThat(Comparators.max(1, 2, reverse)).isEqualTo(1);

            version = null;
        }

        if (version == null) {
            TreeSet<Version> releases = new TreeSet<>(Collections.reverseOrder());
            TreeSet<Version> snapshots = new TreeSet<>(Collections.reverseOrder());

            for (String ver : versions.versions.keySet()) {
                try {
                    Version v = versionScheme.parseVersion(ver);

                logger.debug("{} does not exists.", dir);
            }
            return;
        }
        try (Stream<Path> walk = Files.walk(dir, FileVisitOption.FOLLOW_LINKS)) {
            walk.sorted(Comparator.reverseOrder()).forEach(f -> {
                if (logger.isDebugEnabled()) {
                    logger.debug("Deleting {}", f);
                }
                try {
                    Files.delete(f);