app/code/core/Mage/Shipping/Model/Shipping.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Shipping
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


class Mage_Shipping_Model_Shipping
{
    /**
     * Default shipping orig for requests
     *
     * @var array
     */
    protected $_orig = null;

    /**
     * Cached result
     *
     * @var Mage_Sales_Model_Shipping_Method_Result
     */
    protected $_result = null;


    /**
     * Get shipping rate result model
     *
     * @return Mage_Shipping_Model_Rate_Result
     */
    public function getResult()
    {
        if (empty($this->_result)) {
            $this->_result = Mage::getModel('shipping/rate_result');
        }
        return $this->_result;
    }

    /**
     * Set shipping orig data
     */
    public function setOrigData($data)
    {
        $this->_orig = $data;
    }

    /**
     * Reset cached result
     */
    public function resetResult()
    {
        $this->getResult()->reset();
        return $this;
    }

    /**
     * Retrieve configuration model
     *
     * @return Mage_Shipping_Model_Config
     */
    public function getConfig()
    {
        return Mage::getSingleton('shipping/config');
    }

    /**
     * Retrieve all methods for supplied shipping data
     *
     * @todo make it ordered
     * @param Mage_Shipping_Model_Shipping_Method_Request $data
     * @return Mage_Shipping_Model_Shipping
     */
    public function collectRates(Mage_Shipping_Model_Rate_Request $request)
    {
        if (!$request->getOrig()) {
            $request
                ->setCountryId(Mage::getStoreConfig('shipping/origin/country_id', $request->getStore()))
                ->setRegionId(Mage::getStoreConfig('shipping/origin/region_id', $request->getStore()))
                ->setCity(Mage::getStoreConfig('shipping/origin/city', $request->getStore()))
                ->setPostcode(Mage::getStoreConfig('shipping/origin/postcode', $request->getStore()));
        }

        $limitCarrier = $request->getLimitCarrier();
        if (!$limitCarrier) {
            $carriers = Mage::getStoreConfig('carriers', $request->getStoreId());

            foreach ($carriers as $carrierCode=>$carrierConfig) {
                $this->collectCarrierRates($carrierCode, $request);
            }
        } else {
            if (!is_array($limitCarrier)) {
                $limitCarrier = array($limitCarrier);
            }
            foreach ($limitCarrier as $carrierCode) {
                $carrierConfig = Mage::getStoreConfig('carriers/'.$carrierCode, $request->getStoreId());
                if (!$carrierConfig) {
                    continue;
                }
                $this->collectCarrierRates($carrierCode, $request);
            }
        }

        return $this;
    }

    public function collectCarrierRates($carrierCode, $request)
    {
        $carrier = $this->getCarrierByCode($carrierCode, $request->getStoreId());
        if (!$carrier) {
            return $this;
        }
        $result = $carrier->checkAvailableShipCountries($request);
        if (false !== $result && !($result instanceof Mage_Shipping_Model_Rate_Result_Error)) {
            $result = $carrier->proccessAdditionalValidation($request);
        }
        /*
        * Result will be false if the admin set not to show the shipping module
        * if the devliery country is not within specific countries
        */
        if (false !== $result){
            if (!$result instanceof Mage_Shipping_Model_Rate_Result_Error) {
                $result = $carrier->collectRates($request);
            }
            // sort rates by price
            if (method_exists($result, 'sortRatesByPrice')) {
                $result->sortRatesByPrice();
            }
            $this->getResult()->append($result);
        }
        return $this;
    }

    public function collectRatesByAddress(Varien_Object $address, $limitCarrier=null)
    {
        $request = Mage::getModel('shipping/rate_request');
        $request->setDestCountryId($address->getCountryId());
        $request->setDestRegionId($address->getRegionId());
        $request->setDestPostcode($address->getPostcode());
        $request->setPackageValue($address->getBaseSubtotal());
        $request->setPackageWeight($address->getWeight());
        $request->setFreeMethodWeight($address->getFreeMethodWeight());
        $request->setPackageQty($address->getItemQty());
        $request->setStoreId(Mage::app()->getStore()->getId());
        $request->setWebsiteId(Mage::app()->getStore()->getWebsiteId());
        $request->setBaseCurrency(Mage::app()->getStore()->getBaseCurrency());
        $request->setPackageCurrency(Mage::app()->getStore()->getCurrentCurrency());

        $request->setLimitCarrier($limitCarrier);

        return $this->collectRates($request);
    }

    public function getCarrierByCode($carrierCode, $storeId = null)
    {
        if (!Mage::getStoreConfigFlag('carriers/'.$carrierCode.'/active', $storeId)) {
            return false;
        }
        $className = Mage::getStoreConfig('carriers/'.$carrierCode.'/model', $storeId);
        if (!$className) {
            return false;
            #Mage::throwException('Invalid carrier: '.$carrierCode);
        }
        $obj = Mage::getModel($className);
        if ($storeId) {
            $obj->setStore($storeId);
        }
        return $obj;
    }

}

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