Method unmodifiableOrNull

output/java_guava/1.4.19/Maps.java:3254–3257

(@Nullable Entry<K, V> entry)

  }

  @Nullable
  private static <K, V> Entry<K, V> unmodifiableOrNull(@Nullable Entry<K, V> entry) {
    return (entry == null) ? null : Maps.unmodifiableEntry(entry);
  }

  @GwtIncompatible // NavigableMap
  static class UnmodifiableNavigableMap<K, V> extends ForwardingSortedMap<K, V>