public function valid(\ORC\Util\File\FileInfo $fileinfo)
 {
     if ($this->_min !== null) {
         if ($fileinfo->getSize() < $this->_min) {
             throw new Exception('FILESIZE_TOO_SMALL');
         }
     }
     if ($this->_max !== null) {
         if ($fileinfo->getSize() > $this->_max) {
             throw new Exception('FILESIZE_TOO_BIG');
         }
     }
 }