/**
  * @param null|string $dataSourceParameters
  */
 public function setParams($dataSourceParameters)
 {
     $this->params = new RequestParameters();
     if ($dataSourceParameters !== null) {
         $this->params->set($dataSourceParameters);
     }
     $code = $this->params->getParameter(RequestParameters::OUTPUT_TYPE_PARAMETER);
     $this->outputType = new OutputType($code);
 }