app/code/core/Mage/Newsletter/Model/Session.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_Newsletter
 * @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)
 */

/**
 * Newsletter session model
 *
 * @category   Mage
 * @package    Mage_Newsletter
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Newsletter_Model_Session extends Mage_Core_Model_Session_Abstract
{
    public function __construct()
    {
        $this->init('newsletter');
    }

    public function addError($message)
    {
        $this->setErrorMessage($message);
        return $this;
    }

    public function addSuccess($message)
    {
        $this->setSuccessMessage($message);
        return $this;
    }

    public function getError()
    {
        $message = $this->getErrorMessage();
        $this->unsErrorMessage();
        return $message;
    }

    public function getSuccess()
    {
        $message = $this->getSuccessMessage();
        $this->unsSuccessMessage();
        return $message;
    }
}

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