class ResponseImpl extends Response {

    @Override
    public Link getLink(String relation) {
        Set<Link> links = getAllLinks();
        for (Link link : links) {
            if (link.getRel() != null && link.getRel().equals(relation)) {
                return link;
            }
        }
        return null;
    }

      ResponseImpl(int statusCode);
      ResponseImpl(int statusCode, Object entity);
      ResponseImpl(int statusCode, Object entity, String reasonPhrase);

}