app/code/core/Mage/Bundle/Model/Price/Index.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_Bundle
 * @copyright  Copyright (c) 2009 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Bundle Product Price Index
 *
 * @category   Mage
 * @package    Mage_Bundle
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Bundle_Model_Price_Index extends Mage_Core_Model_Abstract
{
    /**
     * Initialize resource model
     *
     */
    protected function _construct()
    {
        $this->_init('bundle/price_index');
    }

    /**
     * Retrieve resource instance wrapper
     *
     * @return Mage_Bundle_Model_Mysql4_Price_Index
     */
    protected function _getResource()
    {
        return parent::_getResource();
    }

    /**
     * Reindex Product price
     *
     * @param int $productId
     * @param int $priceType
     * @return Mage_Bundle_Model_Price_Index
     */
    protected function _reindexProduct($productId, $priceType)
    {
        $this->_getResource()->reindexProduct($productId, $priceType);
        return $this;
    }

    /**
     * Reindex Bundle product Price Index
     *
     * @param Mage_Core_Model_Product|Mage_Catalog_Model_Product_Condition_Interface|array|int $products
     * @return Mage_Bundle_Model_Price_Index
     */
    public function reindex($products = null)
    {
        $this->_getResource()->reindex($products);
        return $this;
    }

    /**
     * Add bundle price range index to Product collection
     *
     * @param Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection $collection
     * @return Mage_Bundle_Model_Price_Index
     */
    public function addPriceIndexToCollection($collection)
    {
        $productObjects = array();
        $productIds     = array();
        foreach ($collection->getItems() as $product) {
            /* @var $product Mage_Catalog_Model_Product */
            if ($product->getTypeId() == Mage_Catalog_Model_Product_Type::TYPE_BUNDLE) {
                $productIds[] = $product->getEntityId();
                $productObjects[$product->getEntityId()] = $product;
            }
        }
        $websiteId  = Mage::app()->getStore($collection->getStoreId())
            ->getWebsiteId();
        $groupId    = Mage::getSingleton('customer/session')
            ->getCustomerGroupId();

        $addOptionsToResult = false;
        $prices = $this->_getResource()->loadPriceIndex($productIds, $websiteId, $groupId);
        foreach ($productIds as $productId) {
            if (isset($prices[$productId])) {
                $productObjects[$productId]
                    ->setData('_price_index', true)
                    ->setData('_price_index_min_price', $prices[$productId]['min_price'])
                    ->setData('_price_index_max_price', $prices[$productId]['max_price']);
            }
            else {
                $addOptionsToResult = true;
            }
        }

        if ($addOptionsToResult) {
            $collection->addOptionsToResult();
        }

        return $this;
    }

    /**
     * Add price index to bundle product after load
     *
     * @param Mage_Catalog_Model_Product $product
     * @return Mage_Bundle_Model_Price_Index
     */
    public function addPriceIndexToProduct($product)
    {
        $websiteId  = $product->getStore()->getWebsiteId();
        $groupId    = Mage::getSingleton('customer/session')
            ->getCustomerGroupId();
        $prices = $this->_getResource()
            ->loadPriceIndex($product->getId(), $websiteId, $groupId);
        if (isset($prices[$product->getId()])) {
            $product->setData('_price_index', true)
                ->setData('_price_index_min_price', $prices[$product->getId()]['min_price'])
                ->setData('_price_index_max_price', $prices[$product->getId()]['max_price']);
        }
        return $this;
    }
}

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