<?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) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Product url key attribute backend
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author     Magento Core Team <core@magentocommerce.com>
 */

class Mage_Catalog_Model_Attribute_Backend_Customlayoutupdate extends Mage_Eav_Model_Entity_Attribute_Backend_Abstract
{

   /**
    * Product custom layout update attribute validate function.
    * In case invalid data throws exception.
    *
    * @param Varien_Object $object
    * @throws Mage_Eav_Model_Entity_Attribute_Exception
    */
    public function validate($object)
    {
       $attributeName = $this->getAttribute()->getName();
       $updates = trim($object->getData($attributeName));

       if (!$this->getAttribute()->getIsRequired() && empty($updates)) {
           return true;
       }

       try {
           new Varien_Simplexml_Element($updates);
       } catch(Exception $e) {
           $eavExc = new Mage_Eav_Model_Entity_Attribute_Exception(Mage::helper('catalog/product')->__('Please enter valid XML data.'));
           $eavExc->setAttributeCode($attributeName);
           throw $eavExc;
       }
    }
}
