app/code/core/Mage/Adminhtml/controllers/Tax/ClassController.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_Adminhtml
 * @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)
 */

/**
 * Adminhtml common tax class controller
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Tax_ClassController extends Mage_Adminhtml_Controller_Action
{
    /**
     * save class action
     *
     */
    public function saveAction()
    {
        if ($postData = $this->getRequest()->getPost()) {
            $model = Mage::getModel('tax/class')
                ->setData($postData);

            try {
                $model->save();
                $classId    = $model->getId();
                $classType  = $model->getClassType();
                $classUrl   = '*/tax_class_' . strtolower($classType);

                Mage::getSingleton('adminhtml/session')->addSuccess(Mage::helper('tax')->__('Tax class was successfully saved'));
                $this->_redirect($classUrl);

                return ;
            }
            catch (Mage_Core_Exception $e) {
                Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
                Mage::getSingleton('adminhtml/session')->setClassData($postData);
                $this->_redirectReferer();
            }
            catch (Exception $e) {
                Mage::getSingleton('adminhtml/session')->addError(Mage::helper('tax')->__('Error while saving this tax class. Please try again later.'));
                Mage::getSingleton('adminhtml/session')->setClassData($postData);
                $this->_redirectReferer();
            }

            $this->_redirectReferer();
        }
    }

    /**
     * Initialize action
     *
     * @return Mage_Adminhtml_Controller_Action
     */
    protected function _initAction()
    {
        $classType = strtolower($this->getRequest()->getParam('classType'));
        $this->loadLayout()
            ->_setActiveMenu('sales/tax/tax_classes_' . $classType)
            ->_addBreadcrumb(Mage::helper('tax')->__('Sales'), Mage::helper('tax')->__('Sales'))
            ->_addBreadcrumb(Mage::helper('tax')->__('Tax'), Mage::helper('tax')->__('Tax'))
        ;

        return $this;
    }
}

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