Ojs\AdminBundle\Events\AdminEvent::getEntity PHP Method

    public function getEntity()
    {
        return $this->entity;
    }

 /**
  * @param AdminEvent $event
  */
 public function onAdminSubjectChange(AdminEvent $event)
 {
     $getMailEvent = $this->ojsMailer->getEventByName(AdminEvents::ADMIN_SUBJECT_CHANGE);
     if (!$getMailEvent) {
         return;
     }
     foreach ($this->ojsMailer->getAdminUsers() as $user) {
         $transformParams = ['subject.subject' => $event->getEntity()->getSubject(), 'eventType' => $event->getEventType(), 'done.by' => $this->ojsMailer->currentUser()->getUsername(), 'receiver.username' => $user->getUsername(), 'receiver.fullName' => $user->getFullName()];
         $template = $this->ojsMailer->transformTemplate($getMailEvent->getTemplate(), $transformParams);
         $this->ojsMailer->sendToUser($user, $getMailEvent->getSubject(), $template);
     }
 }