/**
  * @see Action::readParameters()
  */
 public function readParameters()
 {
     parent::readParameters();
     if (isset($_REQUEST['participantID'])) {
         $this->participantID = intval($_REQUEST['participantID']);
     }
     $this->participant = new ContestParticipantEditor($this->participantID);
     if (!$this->participant->participantID) {
         throw new IllegalLinkException();
     }
     if (!$this->participant->isDeletable()) {
         throw new PermissionDeniedException();
     }
 }