/**
  * Returns the report's criteria
  *
  * @param ReportConfiguration $configuration
  *
  * @return Criteria
  */
 protected function getCriteria(ReportConfiguration $configuration)
 {
     $criteria = new Criteria();
     $criteria->where($criteria->expr()->gte('createdAt', $configuration->getStartDate()));
     $criteria->andWhere($criteria->expr()->lte('createdAt', $configuration->getEndDate()));
     return $criteria;
 }