EntityTranslationRendererBase.php

<?php

namespace Drupal\views\Entity\Render;

use Drupal\views\Plugin\views\query\QueryPluginBase;
use Drupal\views\ResultRow;

/**
 * Defines a base class for entity translation renderers.
 */
abstract class EntityTranslationRendererBase extends RendererBase {
    
    /**
     * Returns the language code associated with the given row.
     *
     * @param \Drupal\views\ResultRow $row
     *   The result row.
     *
     * @return string
     *   A language code.
     */
    public abstract function getLangcode(ResultRow $row);
    
    /**
     * {@inheritdoc}
     */
    public function query(QueryPluginBase $query, $relationship = NULL) {
    }
    
    /**
     * {@inheritdoc}
     */
    public function preRender(array $result) {
        $view_builder = \Drupal::entityTypeManager()->getViewBuilder($this->entityType
            ->id());
        
        /** @var \Drupal\views\ResultRow $row */
        foreach ($result as $row) {
            // @todo Take relationships into account.
            //   See https://www.drupal.org/node/2457999.
            $entity = $row->_entity;
            $entity->view = $this->view;
            $this->build[$entity->id()] = $view_builder->view($entity, $this->view->rowPlugin->options['view_mode'], $this->getLangcode($row));
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function render(ResultRow $row) {
        $entity_id = $row->_entity
            ->id();
        return $this->build[$entity_id];
    }

}