/**
  * @param Log       $logEntry
  * @param \DateTime $date
  * @return ChangeSet
  */
 private function createChangeSet(Log $logEntry, \DateTime $date)
 {
     $changeSet = new ChangeSet();
     $changeSet->setChangeAt($date);
     $changeSet->setObjectId($logEntry->getObjectId());
     $changeSet->setObjectClass($logEntry->getObjectClass());
     $changeSet->setData($logEntry->getData());
     $changeSet->setOldData($logEntry->getOldData());
     $changeSet->setUsername($logEntry->getUsername());
     $changeSet->setAction($logEntry->getAction());
     return $changeSet;
 }