EntityDeleteDeriver.php

<?php

namespace Drupal\rules\Plugin\RulesEvent;

use Drupal\Component\Plugin\Derivative\DeriverBase;
use Drupal\Core\Entity\ContentEntityTypeInterface;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\StringTranslation\TranslationInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Derives entity delete plugin definitions based on content entity types.
 */
class EntityDeleteDeriver extends DeriverBase implements ContainerDeriverInterface {
    use StringTranslationTrait;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Creates a new EntityDeleteDeriver object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
     *   The string translation service.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, TranslationInterface $string_translation) {
        $this->entityTypeManager = $entity_type_manager;
        $this->stringTranslation = $string_translation;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, $base_plugin_id) {
        return new static($container->get('entity_type.manager'), $container->get('string_translation'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        foreach ($this->entityTypeManager
            ->getDefinitions() as $entity_type_id => $entity_type) {
            // Only allow content entities and ignore configuration entities.
            if (!$entity_type instanceof ContentEntityTypeInterface) {
                continue;
            }
            $this->derivatives[$entity_type_id] = [
                'label' => $this->t('After deleting a @entity_type entity', [
                    '@entity_type' => $entity_type->getSingularLabel(),
                ]),
                'category' => $entity_type->getLabel(),
                'entity_type_id' => $entity_type_id,
                'context_definitions' => [
                    $entity_type_id => [
                        'type' => "entity:{$entity_type_id}",
                        'label' => $entity_type->getLabel(),
                    ],
                ],
            ] + $base_plugin_definition;
        }
        return $this->derivatives;
    }

}