/**
  * @param Event $event
  * @param Company $company
  * @param string $details
  * @return Supporter
  */
 public function create(Event $event, Company $company, $details)
 {
     $supporter = new Supporter();
     $supporter->setCompany($company);
     $supporter->setEvent($event);
     $supporter->setDetails($details);
     $supporter->setCreationTime(new DateTime());
     return $supporter;
 }