app/code/core/Mage/Catalog/Block/Layer/State.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)
 */

/**
 * Layered navigation state
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Catalog_Block_Layer_State extends Mage_Core_Block_Template
{
    /**
     * Initialize Layer State template
     *
     */
    public function __construct()
    {
        parent::__construct();
        $this->setTemplate('catalog/layer/state.phtml');
    }

    /**
     * Retrieve active filters
     *
     * @return array
     */
    public function getActiveFilters()
    {
        $filters = $this->getLayer()->getState()->getFilters();
        if (!is_array($filters)) {
            $filters = array();
        }
        return $filters;
    }

    /**
     * Retrieve Clear Filters URL
     *
     * @return string
     */
    public function getClearUrl()
    {
        $filterState = array();
        foreach ($this->getActiveFilters() as $item) {
            $filterState[$item->getFilter()->getRequestVar()] = $item->getFilter()->getResetValue();
        }
        $params['_current'] = true;
        $params['_use_rewrite'] = true;
        $params['_query']   = $filterState;
        return Mage::getUrl('*/*/*', $params);
    }

    /**
     * Retrieve Layer object
     *
     * @return Mage_Catalog_Model_Layer
     */
    public function getLayer()
    {
        if (!$this->hasData('layer')) {
            $this->setLayer(Mage::getSingleton('catalog/layer'));
        }
        return $this->_getData('layer');
    }
}

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