/**
  * 
  *
  * @param $configuration        generator's configuration
  * @param $objects              a set of objects to fetch information from
  * @param $options              an array of options to configure the exportation. The available options are:
  *                                + type:       xls|csv|html
  */
 public function __construct($configuration, $objects, $options = array(), $exportationForm = null)
 {
     parent::__construct($configuration, $objects, $options);
     if (is_null($exportationForm)) {
         throw new Exception('gmExporterHelperUser requires an exportationForm instance');
     }
     $this->exportationForm = $exportationForm;
 }