class EntityDeriver

class EntityDeriver implements ContainerDeriverInterface {
    
    /**
     * List of derivative definitions.
     *
     * @var array
     */
    protected $derivatives = [];
    
    /**
     * The base plugin ID this derivative is for.
     *
     * @var string
     */
    protected $basePluginId;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The bundle info service.
     *
     * @var \Drupal\Core\Entity\EntityTypeBundleInfoInterface
     */
    protected $bundleInfoService;
    
    /**
     * Constructs an EntityDeriver object.
     *
     * @param string $base_plugin_id
     *   The base plugin ID.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $bundle_info_service
     *   The bundle info service.
     */
    public function __construct($base_plugin_id, EntityTypeManagerInterface $entity_type_manager, EntityTypeBundleInfoInterface $bundle_info_service) {
        $this->basePluginId = $base_plugin_id;
        $this->entityTypeManager = $entity_type_manager;
        $this->bundleInfoService = $bundle_info_service;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, $base_plugin_id) {
        return new static($base_plugin_id, $container->get('entity_type.manager'), $container->get('entity_type.bundle.info'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinition($derivative_id, $base_plugin_definition) {
        if (!empty($this->derivatives) && !empty($this->derivatives[$derivative_id])) {
            return $this->derivatives[$derivative_id];
        }
        $this->getDerivativeDefinitions($base_plugin_definition);
        if (isset($this->derivatives[$derivative_id])) {
            return $this->derivatives[$derivative_id];
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDerivativeDefinitions($base_plugin_definition) {
        // Also keep the 'entity' defined as is.
        $this->derivatives[''] = $base_plugin_definition;
        // Add definitions for each entity type and bundle.
        foreach ($this->entityTypeManager
            ->getDefinitions() as $entity_type_id => $entity_type) {
            $class = $entity_type->entityClassImplements(ConfigEntityInterface::class) ? ConfigEntityAdapter::class : EntityAdapter::class;
            $this->derivatives[$entity_type_id] = [
                'class' => $class,
                'label' => $entity_type->getLabel(),
                'constraints' => $entity_type->getConstraints(),
                'internal' => $entity_type->isInternal(),
            ] + $base_plugin_definition;
            // Incorporate the bundles as entity:$entity_type:$bundle, if any.
            $bundle_info = $this->bundleInfoService
                ->getBundleInfo($entity_type_id);
            if (count($bundle_info) > 1 || $entity_type->getKey('bundle')) {
                foreach ($bundle_info as $bundle => $info) {
                    $this->derivatives[$entity_type_id . ':' . $bundle] = [
                        'class' => $class,
                        'label' => $info['label'],
                        'constraints' => $this->derivatives[$entity_type_id]['constraints'],
                    ] + $base_plugin_definition;
                }
            }
        }
        return $this->derivatives;
    }

}