app/code/core/Mage/Checkout/Block/Cart.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_Checkout
 * @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)
 */

/**
 * Shopping cart block
 *
 * @category    Mage
 * @package     Mage_Checkout
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Checkout_Block_Cart extends Mage_Checkout_Block_Cart_Abstract
{

    public function chooseTemplate()
    {
        if ($this->getQuote()->getItemsCount()) {
            $this->setTemplate($this->getCartTemplate());
        } else {
            $this->setTemplate($this->getEmptyTemplate());
        }
    }

    public function hasError()
    {
        return $this->getQuote()->getHasError();
    }

    public function getItemsSummaryQty()
    {
        return $this->getQuote()->getItemsSummaryQty();
    }

    public function isWishlistActive()
    {
        $isActive = $this->_getData('is_wishlist_active');
        if ($isActive === null) {
            $isActive = Mage::getStoreConfig('wishlist/general/active') && Mage::getSingleton('customer/session')->isLoggedIn();
            $this->setIsWishlistActive($isActive);
        }
        return $isActive;
    }

    public function getCheckoutUrl()
    {
        return $this->getUrl('checkout/onepage', array('_secure'=>true));
    }

    public function getContinueShoppingUrl()
    {
        $url = $this->getData('continue_shopping_url');
        if (is_null($url)) {
            $url = Mage::getSingleton('checkout/session')->getContinueShoppingUrl(true);
            if (!$url) {
                $url = Mage::getUrl();
            }
            $this->setData('continue_shopping_url', $url);
        }
        return $url;
    }

    public function getIsVirtual()
    {
        return $this->helper('checkout/cart')->getIsVirtualQuote();
    }

}

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