RendererBase.php

<?php

namespace Drupal\views\Entity\Render;

use Drupal\Core\Cache\Cache;
use Drupal\Core\Cache\CacheableDependencyInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Language\LanguageManagerInterface;
use Drupal\views\Plugin\views\query\QueryPluginBase;
use Drupal\views\ResultRow;
use Drupal\views\ViewExecutable;

/**
 * Defines a base class for entity renderers.
 */
abstract class RendererBase implements CacheableDependencyInterface {
    
    /**
     * The view executable wrapping the view storage entity.
     *
     * @var \Drupal\views\ViewExecutable
     */
    public $view;
    
    /**
     * The language manager.
     *
     * @var \Drupal\Core\Language\LanguageManagerInterface
     */
    protected $languageManager;
    
    /**
     * The type of the entity being rendered.
     *
     * @var \Drupal\Core\Entity\EntityTypeInterface
     */
    protected $entityType;
    
    /**
     * Contains an array of render arrays, one for each rendered entity.
     *
     * @var array
     */
    protected $build;
    
    /**
     * Constructs a renderer object.
     *
     * @param \Drupal\views\ViewExecutable $view
     *   The entity row being rendered.
     * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
     *   The language manager.
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type.
     */
    public function __construct(ViewExecutable $view, LanguageManagerInterface $language_manager, EntityTypeInterface $entity_type) {
        $this->view = $view;
        $this->languageManager = $language_manager;
        $this->entityType = $entity_type;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheMaxAge() {
        return Cache::PERMANENT;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheContexts() {
        return [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheTags() {
        return [];
    }
    
    /**
     * Alters the query if needed.
     *
     * @param \Drupal\views\Plugin\views\query\QueryPluginBase $query
     *   The query to alter.
     * @param string $relationship
     *   (optional) The relationship, used by a field.
     */
    public abstract function query(QueryPluginBase $query, $relationship = NULL);
    
    /**
     * Runs before each entity is rendered.
     *
     * @param $result
     *   The full array of results from the query.
     */
    public function preRender(array $result) {
    }
    
    /**
     * Renders entity data.
     *
     * @param \Drupal\views\ResultRow $row
     *   A single row of the query result.
     *
     * @return array
     *   A renderable array for the entity data contained in the result row.
     */
    public abstract function render(ResultRow $row);

}