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