public function saveFile(File $file)
 {
     $data = array('title' => $file->getTitle(), 'description' => $file->getDescription(), 'link' => $file->getLink(), 'size' => $file->getSize(), 'extension' => $file->getExtension(), 'category' => $file->getCategory(), 'uploaded' => $file->getUploaded(), 'updated' => date('Y-m-d H:i:s'));
     $id = (int) $file->getId();
     if ($id == 0) {
         $this->tableGateway->insert($data);
     } else {
         if ($this->getFile($id)) {
             $this->tableGateway->update($data, array('id' => $id));
         } else {
             throw new \Exception('Form id does not exist');
         }
     }
 }