<K, V> ReferenceEntry<K, V> copyEntry(
          Segment<K, V> segment,
          ReferenceEntry<K, V> original,
          ReferenceEntry<K, V> newNext,
          K key) {
        ReferenceEntry<K, V> newEntry = super.copyEntry(segment, original, newNext, key);
        copyAccessEntry(original, newEntry);
        copyWriteEntry(original, newEntry);
        return newEntry;
      }
    },
    WEAK {
      @Override

      <K, V> ReferenceEntry<K, V> copyEntry(
          Segment<K, V> segment,
          ReferenceEntry<K, V> original,
          ReferenceEntry<K, V> newNext,
          K key) {
        ReferenceEntry<K, V> newEntry = super.copyEntry(segment, original, newNext, key);
        copyAccessEntry(original, newEntry);
        copyWriteEntry(original, newEntry);
        return newEntry;
      }
    },
    WEAK {
      @Override

   *
   * <p>After calling this method, you may not call {@link #finishToFuture()}, {@link
   * #finishToValueAndCloser(ValueAndCloserConsumer, Executor)}, or any other derivation method on
   * the original {@code ClosingFuture} instance.
   *
   * @param function transforms the value of this step to the value of the derived step
   * @param executor executor to run the function in
   * @return the derived step

    return transformEntries(fromMap, asEntryTransformer(function));
  }

  /**
   * Returns a view of a map whose values are derived from the original map's entries. In contrast
   * to {@link #transformValues}, this method's entry-transformation logic may depend on the key as
   * well as the value.
   *