app/code/core/Mage/Adminhtml/Helper/Dashboard/Order.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 dashboard helper for orders
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Helper_Dashboard_Order extends Mage_Adminhtml_Helper_Dashboard_Abstract
{

    protected function _initCollection()
    {
        $isFilter = $this->getParam('store') || $this->getParam('website') || $this->getParam('group');

        $this->_collection = Mage::getResourceSingleton('reports/order_collection')
            ->prepareSummary($this->getParam('period'), 0, 0, $isFilter);

        if ($this->getParam('store')) {
            $this->_collection->addAttributeToFilter('store_id', $this->getParam('store'));
        } else if ($this->getParam('website')){
            $storeIds = Mage::app()->getWebsite($this->getParam('website'))->getStoreIds();
            $this->_collection->addAttributeToFilter('store_id', array('in' => implode(',', $storeIds)));
        } else if ($this->getParam('group')){
            $storeIds = Mage::app()->getGroup($this->getParam('group'))->getStoreIds();
            $this->_collection->addAttributeToFilter('store_id', array('in' => implode(',', $storeIds)));
        }

        $this->_collection->load();
    }

}

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