app/code/core/Mage/Review/Block/Helper.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_Review
 * @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)
 */

/**
 * Review helper
 *
 * @category   Mage
 * @package    Mage_Review
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Review_Block_Helper extends Mage_Core_Block_Template
{
    private $_availableTemplates = array(
        'default' => 'review/helper/summary.phtml',
        'short'   => 'review/helper/summary_short.phtml'
    );

    public function getSummaryHtml($product, $templateType, $displayIfNoReviews)
    {
        // pick template among available
        if (empty($this->_availableTemplates[$templateType])) {
            $templateType = 'default';
        }
        $this->setTemplate($this->_availableTemplates[$templateType]);

        $this->setDisplayIfEmpty($displayIfNoReviews);

        if (!$product->getRatingSummary()) {
            Mage::getModel('review/review')
               ->getEntitySummary($product, Mage::app()->getStore()->getId());
        }
        $this->setProduct($product);

        return $this->toHtml();
    }

    public function getRatingSummary()
    {
        return $this->getProduct()->getRatingSummary()->getRatingSummary();
    }

    public function getReviewsCount()
    {
        return $this->getProduct()->getRatingSummary()->getReviewsCount();
    }

    public function getReviewsUrl()
    {
        return Mage::getUrl('review/product/list', array(
           'id'        => $this->getProduct()->getId(),
           'category'  => $this->getProduct()->getCategoryId()
        ));
    }

    /**
     * Add an available template by type
     *
     * It should be called before getSummaryHtml()
     *
     * @param string $type
     * @param string $template
     */
    public function addTemplate($type, $template)
    {
        $this->_availableTemplates[$type] = $template;
    }
}

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