app/code/core/Mage/Adminhtml/Block/Review/Rating/Detailed.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 detailed rating stars
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Adminhtml_Block_Review_Rating_Detailed extends Mage_Adminhtml_Block_Template
{
    protected $_voteCollection = false;
    public function __construct()
    {
        parent::__construct();
        $this->setTemplate('rating/detailed.phtml');
        if( Mage::registry('review_data') ) {
            $this->setReviewId(Mage::registry('review_data')->getReviewId());
        }
    }

    public function getRating()
    {
        if( !$this->getRatingCollection() ) {
            if( Mage::registry('review_data') ) {
                $stores = Mage::registry('review_data')->getStores();

                $stores = array_diff($stores, array(0));

                $ratingCollection = Mage::getModel('rating/rating')
                    ->getResourceCollection()
                    ->addEntityFilter('product')
                    ->setStoreFilter($stores)
                    ->setPositionOrder()
                    ->load()
                    ->addOptionToItems();

                $this->_voteCollection = Mage::getModel('rating/rating_option_vote')
                    ->getResourceCollection()
                    ->setReviewFilter($this->getReviewId())
                    ->addOptionInfo()
                    ->load()
                    ->addRatingOptions();

            } elseif (!$this->getIsIndependentMode()) {
                $ratingCollection = Mage::getModel('rating/rating')
                    ->getResourceCollection()
                    ->addEntityFilter('product')
                    ->setStoreFilter(null)
                    ->setPositionOrder()
                    ->load()
                    ->addOptionToItems();
            } else {
                 $ratingCollection = Mage::getModel('rating/rating')
                    ->getResourceCollection()
                    ->addEntityFilter('product')
                    ->setStoreFilter($this->getRequest()->getParam('select_stores') ? $this->getRequest()->getParam('select_stores') : $this->getRequest()->getParam('stores'))
                    ->setPositionOrder()
                    ->load()
                    ->addOptionToItems();


            }
            $this->setRatingCollection( ( $ratingCollection->getSize() ) ? $ratingCollection : false );
        }
        return $this->getRatingCollection();
    }

    public function setIndependentMode()
    {
        $this->setIsIndependentMode(true);
        return $this;
    }

    public function isSelected($option, $rating)
    {
        if($this->getIsIndependentMode()) {
            $ratings = $this->getRequest()->getParam('ratings');

            if(isset($ratings[$option->getRatingId()])) {
                return $option->getId() == $ratings[$option->getRatingId()];
            }

            return false;
        }

        if($this->_voteCollection) {
            foreach($this->_voteCollection as $vote) {
                if($option->getId() == $vote->getOptionId()) {
                    return true;
                }
            }
        }

        return false;
    }
}

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