public static boolean supports(Map<Integer, SortedSet<LayoutFeature>> map,
      final LayoutFeature f, final int lv) {
    final SortedSet<LayoutFeature> set =  map.get(lv);
    return set != null && set.contains(f);
  }
@Test
  public void testRelease1_2_0() {
    assertTrue(NameNodeLayoutVersion.supports(LayoutVersion.Feature.CONCAT, 
        Feature.RESERVED_REL1_2_0.getInfo().getLayoutVersion()));
  }