<?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_Core
 * @copyright   Copyright (c) 2012 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Core layout update resource model
 *
 * @category    Mage
 * @package     Mage_Core
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Core_Model_Resource_Layout extends Mage_Core_Model_Resource_Db_Abstract
{
    /**
     * Define main table
     *
     */
    protected function _construct()
    {
        $this->_init('core/layout_update', 'layout_update_id');
    }

    /**
     * Retrieve layout updates by handle
     *
     * @param string $handle
     * @param array $params
     * @return string
     */
    public function fetchUpdatesByHandle($handle, $params = array())
    {
        $bind = array(
            'store_id'  => Mage::app()->getStore()->getId(),
            'area'      => Mage::getSingleton('core/design_package')->getArea(),
            'package'   => Mage::getSingleton('core/design_package')->getPackageName(),
            'theme'     => Mage::getSingleton('core/design_package')->getTheme('layout')
        );

        foreach ($params as $key => $value) {
            if (isset($bind[$key])) {
                $bind[$key] = $value;
            }
        }
        $bind['layout_update_handle'] = $handle;
        $result = '';

        $readAdapter = $this->_getReadAdapter();
        if ($readAdapter) {
            $select = $readAdapter->select()
                ->from(array('layout_update' => $this->getMainTable()), array('xml'))
                ->join(array('link'=>$this->getTable('core/layout_link')), 
                        'link.layout_update_id=layout_update.layout_update_id',
                        '')
                ->where('link.store_id IN (0, :store_id)')
                ->where('link.area = :area')
                ->where('link.package = :package')
                ->where('link.theme = :theme')
                ->where('layout_update.handle = :layout_update_handle')
                ->order('layout_update.sort_order ' . Varien_Db_Select::SQL_ASC);

            $result = join('', $readAdapter->fetchCol($select, $bind));
        }
        return $result;
    }
}