Save.php

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<?php
namespace Magento\Customer\Controller\Adminhtml\Group;

use Magento\Framework\App\Action\HttpPostActionInterface as HttpPostActionInterface;
use Magento\Customer\Api\Data\GroupInterfaceFactory;
use Magento\Customer\Api\Data\GroupInterface;
use Magento\Customer\Api\GroupRepositoryInterface;

class Save extends \Magento\Customer\Controller\Adminhtml\Group implements HttpPostActionInterface
{
    protected $dataObjectProcessor;

    public function __construct(
        \Magento\Backend\App\Action\Context $context,
        \Magento\Framework\Registry $coreRegistry,
        GroupRepositoryInterface $groupRepository,
        GroupInterfaceFactory $groupDataFactory,
        \Magento\Backend\Model\View\Result\ForwardFactory $resultForwardFactory,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
        \Magento\Framework\Reflection\DataObjectProcessor $dataObjectProcessor
    ) {
        $this->dataObjectProcessor = $dataObjectProcessor;
        parent::__construct(
            $context,
            $coreRegistry,
            $groupRepository,
            $groupDataFactory,
            $resultForwardFactory,
            $resultPageFactory
        );
    }

    protected function storeCustomerGroupDataToSession($customerGroupData)
    {
        if (array_key_exists('code', $customerGroupData)) {
            $customerGroupData['customer_group_code'] = $customerGroupData['code'];
            unset($customerGroupData['code']);
        }
        $this->_getSession()->setCustomerGroupData($customerGroupData);
    }

    public function execute()
    {
        $taxClass = (int)$this->getRequest()->getParam('tax_class');

        $customerGroup = null;
        if ($taxClass) {
            $id = $this->getRequest()->getParam('id');
            $resultRedirect = $this->resultRedirectFactory->create();
            try {
                $customerGroupCode = (string)$this->getRequest()->getParam('code');
                if ($id !== null) {
                    $customerGroup = $this->groupRepository->getById((int)$id);
                    $customerGroupCode = $customerGroupCode ?: $customerGroup->getCode();
                } else {
                    $customerGroup = $this->groupDataFactory->create();
                }
                $customerGroup->setCode(!empty($customerGroupCode) ? $customerGroupCode : null);
                $customerGroup->setTaxClassId($taxClass);

                $this->groupRepository->save($customerGroup);

                $this->messageManager->addSuccess(__('You saved the customer group.'));
                $resultRedirect->setPath('customer/group');
            } catch (\Exception $e) {
                $this->messageManager->addError($e->getMessage());
                if ($customerGroup != null) {
                    $this->storeCustomerGroupDataToSession(
                        $this->dataObjectProcessor->buildOutputDataArray(
                            $customerGroup,
                            \Magento\Customer\Api\Data\GroupInterface::class
                        )
                    );
                }
                $resultRedirect->setPath('customer/group/edit', ['id' => $id]);
            }
            return $resultRedirect;
        } else {
            return $this->resultForwardFactory->create()->forward('new');
        }
    }
}