app/code/core/Mage/CatalogSearch/Model/Layer.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_CatalogSearch
 * @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)
 */

class Mage_CatalogSearch_Model_Layer extends Mage_Catalog_Model_Layer
{
    const XML_PATH_DISPLAY_LAYER_COUNT    = 'catalog/search/use_layered_navigation_count';

    /**
     * Get current layer product collection
     *
     * @return Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection
     */
    public function getProductCollection()
    {
        if (isset($this->_productCollections[$this->getCurrentCategory()->getId()])) {
            $collection = $this->_productCollections[$this->getCurrentCategory()->getId()];
        }
        else {
            $collection = Mage::getResourceModel('catalogsearch/fulltext_collection');
            $this->prepareProductCollection($collection);
            $this->_productCollections[$this->getCurrentCategory()->getId()] = $collection;
        }

        return $collection;
    }

    /**
     * Prepare product collection
     *
     * @param Mage_Catalog_Model_Resource_Eav_Mysql4_Product_Collection $collection
     * @return Mage_Catalog_Model_Layer
     */
    public function prepareProductCollection($collection)
    {
        $collection->addAttributeToSelect(Mage::getSingleton('catalog/config')->getProductAttributes())
            ->addSearchFilter(Mage::helper('catalogSearch')->getEscapedQueryText())
            ->setStore(Mage::app()->getStore())
            ->addMinimalPrice()
            ->addFinalPrice()
            ->addTaxPercents()
            ->addStoreFilter()
            ->addUrlRewrite();

        Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($collection);
        Mage::getSingleton('catalog/product_visibility')->addVisibleInSearchFilterToCollection($collection);
        return $this;
    }

    /**
     * Get layer state key
     *
     * @return string
     */
    public function getStateKey()
    {
        if ($this->_stateKey === null) {
            $this->_stateKey = 'Q_'.Mage::helper('catalogSearch')->getQuery()->getId()
                .'_'.parent::getStateKey();
        }
        return $this->_stateKey;
    }

    /**
     * Get default tags for current layer state
     *
     * @param   array $additionalTags
     * @return  array
     */
    public function getStateTags(array $additionalTags = array())
    {
        $additionalTags = parent::getStateTags($additionalTags);
        $additionalTags[] = Mage_CatalogSearch_Model_Query::CACHE_TAG;
        return $additionalTags;
    }

    /**
     * Add filters to attribute collection
     *
     * @param   Mage_Eav_Model_Mysql4_Entity_Attribute_Collection $collection
     * @return  Mage_Eav_Model_Mysql4_Entity_Attribute_Collection
     */
    protected function _prepareAttributeCollection($collection)
    {
        $collection->addIsFilterableInSearchFilter();
        return $collection;
    }

    /**
     * Prepare attribute for use in layered navigation
     *
     * @param   Mage_Eav_Model_Entity_Attribute $attribute
     * @return  Mage_Eav_Model_Entity_Attribute
     */
    protected function _prepareAttribute($attribute)
    {
        $attribute = parent::_prepareAttribute($attribute);
        $attribute->setIsFilterable(Mage_Catalog_Model_Layer_Filter_Attribute::OPTIONS_ONLY_WITH_RESULTS);
        return $attribute;
    }
}

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