/**
  * Get a list of all Data Storages available 
  * @param null
  * @return 
  **/
 public static function getAllDataStoragePreferences($gateways)
 {
     $dspArray = array();
     foreach ($gateways as $gateway) {
         $dspArray[] = Airavata::getAllGatewayDataStoragePreferences(Session::get('authz-token'), $gateway->gatewayId);
     }
     return $dspArray;
 }