/**
  * @param array  $params         (reference ) an assoc array of name/value pairs
  *
  * @return object       CRM_Core_BAO_SEPAContributionGroup object on success, null otherwise
  * @access public
  * @static
  */
 static function add(&$params)
 {
     $hook = empty($params['id']) ? 'create' : 'edit';
     CRM_Utils_Hook::pre($hook, 'SepaContributionGroup', CRM_Utils_Array::value('id', $params), $params);
     $dao = new CRM_Sepa_DAO_SEPAContributionGroup();
     $dao->copyValues($params);
     $dao->save();
     CRM_Utils_Hook::post($hook, 'SepaContributionGroup', $dao->id, $dao);
     return $dao;
 }