app/code/core/Mage/Shipping/Model/Tracking/Result.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_Shipping
 * @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_Shipping_Model_Tracking_Result
{

    protected $_trackings = array();
    protected $_error = null;

    /**
     * Reset tracking
     */
    public function reset()
    {
        $this->_trackings = array();
        return $this;
    }

    public function setError($error)
    {
        $this->_error = $error;
    }

    public function getError()
    {
        return $this->_error;
    }
    /**
     * Add a tracking to the result
     */
    public function append($result)
    {
        if ($result instanceof Mage_Shipping_Model_Tracking_Result_Abstract) {
            $this->_trackings[] = $result;
        } elseif ($result instanceof Mage_Shipping_Model_Rate_Result) {
            $trackings = $result->getAllTrackings();
            foreach ($trackings as $track) {
                $this->append($track);
            }
        }
        return $this;
    }

    /**
     * Return all trackings in the result
     */
    public function getAllTrackings()
    {
        return $this->_trackings;
    }

}

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