class VocabularyListBuilder

class VocabularyListBuilder extends DraggableListBuilder {
    
    /**
     * {@inheritdoc}
     */
    protected $entitiesKey = 'vocabularies';
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountInterface
     */
    protected $currentUser;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The renderer service.
     *
     * @var \Drupal\Core\Render\RendererInterface
     */
    protected $renderer;
    
    /**
     * The messenger.
     *
     * @var \Drupal\Core\Messenger\MessengerInterface
     */
    protected $messenger;
    
    /**
     * Constructs a new VocabularyListBuilder object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Session\AccountInterface $current_user
     *   The current user.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager service.
     * @param \Drupal\Core\Render\RendererInterface $renderer
     *   The renderer service.
     * @param \Drupal\Core\Messenger\MessengerInterface $messenger
     *   The messenger.
     */
    public function __construct(EntityTypeInterface $entity_type, AccountInterface $current_user, EntityTypeManagerInterface $entity_type_manager, RendererInterface $renderer, MessengerInterface $messenger) {
        parent::__construct($entity_type, $entity_type_manager->getStorage($entity_type->id()));
        $this->currentUser = $current_user;
        $this->entityTypeManager = $entity_type_manager;
        $this->renderer = $renderer;
        $this->messenger = $messenger;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($entity_type, $container->get('current_user'), $container->get('entity_type.manager'), $container->get('renderer'), $container->get('messenger'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'taxonomy_overview_vocabularies';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOperations(EntityInterface $entity) {
        $operations = parent::getDefaultOperations($entity);
        if (isset($operations['edit'])) {
            $operations['edit']['title'] = $this->t('Edit vocabulary');
        }
        if (isset($operations['delete'])) {
            $operations['delete']['title'] = $this->t('Delete vocabulary');
        }
        if ($entity->access('access taxonomy overview')) {
            $operations['list'] = [
                'title' => $this->t('List terms'),
                'weight' => 0,
                'url' => $entity->toUrl('overview-form'),
            ];
        }
        $taxonomy_term_access_control_handler = $this->entityTypeManager
            ->getAccessControlHandler('taxonomy_term');
        if ($taxonomy_term_access_control_handler->createAccess($entity->id())) {
            $operations['add'] = [
                'title' => $this->t('Add terms'),
                'weight' => 10,
                'url' => Url::fromRoute('entity.taxonomy_term.add_form', [
                    'taxonomy_vocabulary' => $entity->id(),
                ]),
            ];
        }
        return $operations;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header['label'] = $this->t('Vocabulary name');
        $header['description'] = $this->t('Description');
        if ($this->currentUser
            ->hasPermission('administer vocabularies') && !empty($this->weightKey)) {
            $header['weight'] = $this->t('Weight');
        }
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $entity) {
        $row['label'] = $entity->label();
        $row['description']['data'] = [
            '#markup' => $entity->getDescription(),
        ];
        return $row + parent::buildRow($entity);
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        $entities = $this->load();
        // If there are not multiple vocabularies, disable dragging by unsetting the
        // weight key.
        if (count($entities) <= 1) {
            unset($this->weightKey);
        }
        $build = parent::render();
        // If the weight key was unset then the table is in the 'table' key,
        // otherwise in vocabularies. The empty message is only needed if the table
        // is possibly empty, so there is no need to support the vocabularies key
        // here.
        if (isset($build['table'])) {
            $access_control_handler = $this->entityTypeManager
                ->getAccessControlHandler('taxonomy_vocabulary');
            $create_access = $access_control_handler->createAccess(NULL, NULL, [], TRUE);
            $this->renderer
                ->addCacheableDependency($build['table'], $create_access);
            if ($create_access->isAllowed()) {
                $build['table']['#empty'] = $this->t('No vocabularies available. <a href=":link">Add vocabulary</a>.', [
                    ':link' => Url::fromRoute('entity.taxonomy_vocabulary.add_form')->toString(),
                ]);
            }
            else {
                $build['table']['#empty'] = $this->t('No vocabularies available.');
            }
        }
        return $build;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form = parent::buildForm($form, $form_state);
        $form['vocabularies']['#attributes'] = [
            'id' => 'taxonomy',
        ];
        $form['actions']['submit']['#value'] = $this->t('Save');
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        parent::submitForm($form, $form_state);
        $this->messenger
            ->addStatus($this->t('The configuration options have been saved.'));
    }

}