<?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_Eav
 * @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)
 */

/**
 * "Serialized" attribute backend
 */
class Mage_Eav_Model_Entity_Attribute_Backend_Serialized extends Mage_Eav_Model_Entity_Attribute_Backend_Abstract
{
    /**
     * Serialize before saving
     *
     * @param Varien_Object $object
     * @return Mage_Eav_Model_Entity_Attribute_Backend_Serialized
     */
    public function beforeSave($object)
    {
        // parent::beforeSave() is not called intentionally
        $attrCode = $this->getAttribute()->getAttributeCode();
        if ($object->hasData($attrCode)) {
            $object->setData($attrCode, serialize($object->getData($attrCode)));
        }

        return $this;
    }

    /**
     * Unserialize after saving
     *
     * @param Varien_Object $object
     * @return Mage_Eav_Model_Entity_Attribute_Backend_Serialized
     */
    public function afterSave($object)
    {
        parent::afterSave($object);
        $this->_unserialize($object);
        return $this;
    }

    /**
     * Unserialize after loading
     *
     * @param Varien_Object $object
     * @return Mage_Eav_Model_Entity_Attribute_Backend_Serialized
     */
    public function afterLoad($object)
    {
        parent::afterLoad($object);
        $this->_unserialize($object);
        return $this;
    }

    /**
     * Try to unserialize the attribute value
     *
     * @param Varien_Object $object
     * @return Mage_Eav_Model_Entity_Attribute_Backend_Serialized
     */
    protected function _unserialize(Varien_Object $object)
    {
        $attrCode = $this->getAttribute()->getAttributeCode();
        if ($object->getData($attrCode)) {
            try {
                $unserialized = unserialize($object->getData($attrCode));
                $object->setData($attrCode, $unserialized);
            } catch (Exception $e) {
                $object->unsetData($attrCode);
            }
        }

        return $this;
    }
}