LanguageController.php

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<?php
namespace TYPO3\CMS\Lang\Controller;

class LanguageController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {

    protected $languageRepository;

    protected $extensionRepository;

    protected $updateTranslationService;

    protected $jsonActions = array('updateTranslation');

    protected function initializeView(\TYPO3\CMS\Extbase\Mvc\View\ViewInterface $view) {
        $actionName = $this->request->getControllerActionName();
        if (in_array($actionName, $this->jsonActions)) {
            $viewObjectName = 'TYPO3\\CMS\\Lang\\View\\Language\\' . ucfirst($actionName) . 'Json';
            $this->view = $this->objectManager->get($viewObjectName);
            $this->view->setControllerContext($this->controllerContext);
            $this->view->initializeView();
        }
    }

    public function indexAction(\TYPO3\CMS\Lang\Domain\Model\LanguageSelectionForm $languageSelectionForm = NULL, $extensions = NULL) {
        if ($languageSelectionForm === NULL) {
            $languageSelectionForm = $this->objectManager->get('TYPO3\\CMS\\Lang\\Domain\\Model\\LanguageSelectionForm');
            $languageSelectionForm->setLanguages($this->languageRepository->findAll());
            $languageSelectionForm->setSelectedLanguages($this->languageRepository->findSelected());
        }

        if (empty($extensions)) {
            $extensions = $this->extensionRepository->findAll();
        }

        $this->view->assign('languageSelectionForm', $languageSelectionForm);
        $this->view->assign('extensions', $extensions);
    }

    public function updateLanguageSelectionAction(\TYPO3\CMS\Lang\Domain\Model\LanguageSelectionForm $languageSelectionForm) {
        if ($languageSelectionForm !== NULL) {
            $this->languageRepository->updateSelectedLanguages($languageSelectionForm->getSelectedLanguages());
        }
        $this->redirect('index');
    }

    public function updateTranslationAction($extension, $locales) {
        $locales = $this->updateTranslationService->updateTranslation($extension, $locales);
        $this->view->assign('extension', $extension);
        $this->view->assign('locales', $locales);
    }

}