Method unmodifiableMap

corpus/java/training/guava/collect/Maps.java:497–503

(Map<K, ? extends V> map)

  }

  private static <K, V> Map<K, V> unmodifiableMap(Map<K, ? extends V> map) {
    if (map instanceof SortedMap) {
      return Collections.unmodifiableSortedMap((SortedMap<K, ? extends V>) map);
    } else {
      return Collections.unmodifiableMap(map);
    }
  }

  static class MapDifferenceImpl<K, V> implements MapDifference<K, V> {
    final Map<K, V> onlyOnLeft;