app/code/core/Mage/Catalog/Model/Category/Attribute/Source/Sortby.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_Catalog
 * @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)
 */


/**
 * Catalog Category *_sort_by Attributes Source Model
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Catalog_Model_Category_Attribute_Source_Sortby
    extends Mage_Eav_Model_Entity_Attribute_Source_Abstract
{
    /**
     * Retrieve Catalog Config Singleton
     *
     * @return Mage_Catalog_Model_Config
     */
    protected function _getCatalogConfig() {
        return Mage::getSingleton('catalog/config');
    }

    /**
     * Retrieve All options
     *
     * @return array
     */
    public function getAllOptions()
    {
        if (is_null($this->_options)) {
            $this->_options = array(array(
                'label' => Mage::helper('catalog')->__('Best Value'),
                'value' => 'position'
            ));
            foreach ($this->_getCatalogConfig()->getAttributesUsedForSortBy() as $attribute) {
                $this->_options[] = array(
                    'label' => Mage::helper('catalog')->__($attribute['frontend_label']),
                    'value' => $attribute['attribute_code']
                );
            }
        }
        return $this->_options;
    }
}

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