app/code/core/Mage/Adminhtml/Block/Review/Rating/Summary.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_Adminhtml
 * @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)
 */

/**
 * Adminhtml summary rating stars
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Adminhtml_Block_Review_Rating_Summary extends Mage_Adminhtml_Block_Template
{
    public function __construct()
    {
        $this->setTemplate('rating/stars/summary.phtml');
        $this->setReviewId(Mage::registry('review_data')->getId());
    }

    public function getRating()
    {
        if( !$this->getRatingCollection() ) {
            $ratingCollection = Mage::getModel('rating/rating_option_vote')
                ->getResourceCollection()
                ->setReviewFilter($this->getReviewId())
                ->addRatingInfo()
                ->load();
            $this->setRatingCollection( ( $ratingCollection->getSize() ) ? $ratingCollection : false );
        }
        return $this->getRatingCollection();
    }

    public function getRatingSummary()
    {
        if( !$this->getRatingSummaryCache() ) {
            $this->setRatingSummaryCache(Mage::getModel('rating/rating')->getReviewSummary($this->getReviewId()));
        }

        return $this->getRatingSummaryCache();
    }
}

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