public function importShippingRate(Mage_Shipping_Model_Rate_Result_Abstract $rate)
 {
     if ($rate instanceof Mage_Shipping_Model_Rate_Result_Error) {
         $this->setCode($rate->getCarrier() . '_error')->setCarrier($rate->getCarrier())->setCarrierTitle($rate->getCarrierTitle())->setErrorMessage($rate->getErrorMessage());
     } elseif ($rate instanceof Mage_Shipping_Model_Rate_Result_Method) {
         $this->setCode($rate->getCarrier() . '_' . $rate->getMethod())->setCarrier($rate->getCarrier())->setCarrierTitle($rate->getCarrierTitle())->setMethod($rate->getMethod())->setMethodTitle($rate->getMethodTitle())->setMethodDescription($rate->getMethodDescription())->setShippingRatesByVendors($rate->getShippingRatesByVendors())->setMethodDetail($rate->getMethodDetail())->setPrice($rate->getPrice());
     }
     return $this;
 }