android/guava/src/com/google/common/collect/Maps.java
static <V2, K, V1> Entry<K, V2> transformEntry(
      final EntryTransformer<? super K, ? super V1, V2> transformer, final Entry<K, V1> entry) {
    checkNotNull(transformer);
    checkNotNull(entry);
    return new AbstractMapEntry<K, V2>() {
      @Override
      public K getKey() {
        return entry.getKey();
      }

      @Override
      public V2 getValue() {
        return transformer.transformEntry(entry.getKey(), entry.getValue());
      }
    };
  }
static <V2, K, V1> Entry<K, V2> transformEntry(
      final EntryTransformer<? super K, ? super V1, V2> transformer, final Entry<K, V1> entry) {
    checkNotNull(transformer);
    checkNotNull(entry);
    return new AbstractMapEntry<K, V2>() {
      @Override
      public K getKey() {
        return entry.getKey();
      }

      @Override
      public V2 getValue() {
        return transformer.transformEntry(entry.getKey(), entry.getValue());
      }
    };
  }
Returns a view of an entry transformed by the specified transformer.