app/code/core/Mage/Adminhtml/controllers/Catalog/Product/SetController.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 entity sets controller
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Adminhtml_Catalog_Product_SetController extends Mage_Adminhtml_Controller_Action
{
    public function indexAction()
    {
        $this->_setTypeId();

        $this->loadLayout();
        $this->_setActiveMenu('catalog/sets');

        $this->_addBreadcrumb(Mage::helper('catalog')->__('Catalog'), Mage::helper('catalog')->__('Catalog'));
        $this->_addBreadcrumb(Mage::helper('catalog')->__('Manage Attribute Sets'), Mage::helper('catalog')->__('Manage Attribute Sets'));

        $this->_addContent($this->getLayout()->createBlock('adminhtml/catalog_product_attribute_set_toolbar_main'));
        $this->_addContent($this->getLayout()->createBlock('adminhtml/catalog_product_attribute_set_grid'));

        $this->renderLayout();
    }

    public function editAction()
    {
        $this->_setTypeId();
        $attributeSet = Mage::getModel('eav/entity_attribute_set')
            ->load($this->getRequest()->getParam('id'));

        if (!$attributeSet->getId()) {
            $this->_redirect('*/*/index');
            return;
        }

        Mage::register('current_attribute_set', $attributeSet);

        $this->loadLayout();
        $this->_setActiveMenu('catalog/sets');
        $this->getLayout()->getBlock('head')->setCanLoadExtJs(true);

        $this->_addBreadcrumb(Mage::helper('catalog')->__('Catalog'), Mage::helper('catalog')->__('Catalog'));
        $this->_addBreadcrumb(Mage::helper('catalog')->__('Manage Product Sets'), Mage::helper('catalog')->__('Manage Product Sets'));

        $this->_addContent($this->getLayout()->createBlock('adminhtml/catalog_product_attribute_set_main'));

        $this->renderLayout();
    }

    public function setGridAction()
    {
        $this->_setTypeId();
        $this->getResponse()->setBody($this->getLayout()->createBlock('adminhtml/catalog_product_attribute_set_grid')->toHtml());
    }

    public function saveAction()
    {
        $this->_setTypeId();
        $response = new Varien_Object();
        $response->setError(0);

        $modelSet = Mage::getModel('eav/entity_attribute_set')
            ->setId($this->getRequest()->getParam('id'))
            ->setEntityTypeId(Mage::registry('entityType'));

        if( $this->getRequest()->getParam('gotoEdit') ) {
            $modelSet = Mage::getModel('eav/entity_attribute_set');
            $modelSet->setAttributeSetName($this->getRequest()->getParam('attribute_set_name'))
                ->setEntityTypeId(Mage::registry('entityType'));
        } else {
            $data = Zend_Json_Decoder::decode($this->getRequest()->getPost('data'));
            $modelSet->organizeData($data);
        }

        try {
            $modelSet->validate($modelSet->getAttributeSetName());
            $modelSet->save();
            if( $this->getRequest()->getParam('gotoEdit') == 1 ) {
                $modelSet->initFromSkeleton($this->getRequest()->getParam('skeleton_set'))
                    ->save();

                $this->_redirect('*/*/edit', array('id' => $modelSet->getId()));
                $this->_getSession()->addSuccess($this->__('Attribute set successfully saved.'));
            } else {
                $this->_getSession()->addSuccess($this->__('Attribute set successfully saved.'));
//                $this->_initLayoutMessages('adminhtml/session');
//                $response->setMessage($this->getLayout()->getMessagesBlock()->getGroupedHtml());
                $response->setUrl($this->getUrl('*/*/edit', array('id' => $modelSet->getId())));
                //$this->_redirect('*/*/'); Why? there is Ajax.
            }
        }
        catch (Exception $e) {
            $this->_getSession()->addError($e->getMessage());
            if( $this->getRequest()->getParam('gotoEdit') == 1 ) {
                $this->_redirectReferer();
            } else {
                $this->_initLayoutMessages('adminhtml/session');
                $response->setMessage($this->getLayout()->getMessagesBlock()->getGroupedHtml());
                $response->setError(1);
            }
        }
        if( $this->getRequest()->getParam('gotoEdit') != 1 ) {
            $this->getResponse()->setBody($response->toJson());
        }
    }

    public function addAction()
    {
        $this->_setTypeId();

        $this->loadLayout();
        $this->_setActiveMenu('catalog/sets');

        $this->_addContent($this->getLayout()->createBlock('adminhtml/catalog_product_attribute_set_toolbar_add'));

        $this->renderLayout();
    }

    public function deleteAction()
    {
        $setId = $this->getRequest()->getParam('id');
        try {
            Mage::getModel('eav/entity_attribute_set')
                ->setId($setId)
                ->delete();

            $this->_getSession()->addSuccess($this->__('Attribute set was successfully removed.'));
            $this->getResponse()->setRedirect($this->getUrl('*/*/'));
        } catch (Exception $e) {
            $this->_getSession()->addError($this->__('Error while deleting this set.'));
            $this->_redirectReferer();
        }
    }

    protected function _setTypeId()
    {
        Mage::register('entityType',
            Mage::getModel('catalog/product')->getResource()->getTypeId());
    }

    protected function _isAllowed()
    {
        return Mage::getSingleton('admin/session')->isAllowed('catalog/attributes/sets');
    }
}

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