Method transform

guava/src/com/google/common/base/Absent.java:75–79

(Function<? super T, V> function)

  }

  @Override
  public <V> Optional<V> transform(Function<? super T, V> function) {
    checkNotNull(function);
    return Optional.absent();
  }

  @Override
  public boolean equals(@Nullable Object obj) {