class EntityTypeManager

class EntityTypeManager extends DefaultPluginManager implements EntityTypeManagerInterface, ContainerAwareInterface {
    use ContainerAwareTrait;
    
    /**
     * Contains instantiated handlers keyed by handler type and entity type.
     *
     * @var array
     */
    protected $handlers = [];
    
    /**
     * The string translation service.
     *
     * @var \Drupal\Core\StringTranslation\TranslationInterface
     */
    protected $stringTranslation;
    
    /**
     * The class resolver.
     *
     * @var \Drupal\Core\DependencyInjection\ClassResolverInterface
     */
    protected $classResolver;
    
    /**
     * The entity last installed schema repository.
     *
     * @var \Drupal\Core\Entity\EntityLastInstalledSchemaRepositoryInterface
     */
    protected $entityLastInstalledSchemaRepository;
    
    /**
     * Constructs a new Entity plugin manager.
     *
     * @param \Traversable $namespaces
     *   An object that implements \Traversable which contains the root paths
     *   keyed by the corresponding namespace to look for plugin implementations,
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     * @param \Drupal\Core\Cache\CacheBackendInterface $cache
     *   The cache backend to use.
     * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
     *   The string translation.
     * @param \Drupal\Core\DependencyInjection\ClassResolverInterface $class_resolver
     *   The class resolver.
     * @param \Drupal\Core\Entity\EntityLastInstalledSchemaRepositoryInterface $entity_last_installed_schema_repository
     *   The entity last installed schema repository.
     */
    public function __construct(\Traversable $namespaces, ModuleHandlerInterface $module_handler, CacheBackendInterface $cache, TranslationInterface $string_translation, ClassResolverInterface $class_resolver, EntityLastInstalledSchemaRepositoryInterface $entity_last_installed_schema_repository) {
        parent::__construct('Entity', $namespaces, $module_handler, 'Drupal\\Core\\Entity\\EntityInterface');
        $this->setCacheBackend($cache, 'entity_type', [
            'entity_types',
        ]);
        $this->alterInfo('entity_type');
        $this->discovery = new AnnotatedClassDiscovery('Entity', $namespaces, 'Drupal\\Core\\Entity\\Annotation\\EntityType');
        $this->stringTranslation = $string_translation;
        $this->classResolver = $class_resolver;
        $this->entityLastInstalledSchemaRepository = $entity_last_installed_schema_repository;
    }
    
    /**
     * {@inheritdoc}
     */
    public function processDefinition(&$definition, $plugin_id) {
        
        /** @var \Drupal\Core\Entity\EntityTypeInterface $definition */
        parent::processDefinition($definition, $plugin_id);
        // All link templates must have a leading slash.
        foreach ((array) $definition->getLinkTemplates() as $link_relation_name => $link_template) {
            if ($link_template[0] != '/') {
                throw new InvalidLinkTemplateException("Link template '{$link_relation_name}' for entity type '{$plugin_id}' must start with a leading slash, the current link template is '{$link_template}'");
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function findDefinitions() {
        $definitions = $this->getDiscovery()
            ->getDefinitions();
        $this->moduleHandler
            ->invokeAllWith('entity_type_build', function (callable $hook, string $module) use (&$definitions) {
            $hook($definitions);
        });
        foreach ($definitions as $plugin_id => $definition) {
            $this->processDefinition($definition, $plugin_id);
        }
        $this->alterDefinitions($definitions);
        return $definitions;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefinition($entity_type_id, $exception_on_invalid = TRUE) {
        if (($entity_type = parent::getDefinition($entity_type_id, FALSE)) && class_exists($entity_type->getClass())) {
            return $entity_type;
        }
        elseif (!$exception_on_invalid) {
            return NULL;
        }
        throw new PluginNotFoundException($entity_type_id, sprintf('The "%s" entity type does not exist.', $entity_type_id));
    }
    
    /**
     * Gets the active definition for a content entity type.
     *
     * @param string $entity_type_id
     *   The entity type ID.
     *
     * @return \Drupal\Core\Entity\EntityTypeInterface
     *   The active entity type definition.
     *
     * @internal
     */
    public function getActiveDefinition($entity_type_id) {
        $definition = $this->entityLastInstalledSchemaRepository
            ->getLastInstalledDefinition($entity_type_id);
        return $definition ?: $this->getDefinition($entity_type_id);
    }
    
    /**
     * {@inheritdoc}
     */
    public function clearCachedDefinitions() {
        parent::clearCachedDefinitions();
        $this->handlers = [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function useCaches($use_caches = FALSE) {
        parent::useCaches($use_caches);
        if (!$use_caches) {
            $this->handlers = [];
            $this->container
                ->get('entity.memory_cache')
                ->reset();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function hasHandler($entity_type_id, $handler_type) {
        if ($definition = $this->getDefinition($entity_type_id, FALSE)) {
            return $definition->hasHandlerClass($handler_type);
        }
        return FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getStorage($entity_type_id) {
        return $this->getHandler($entity_type_id, 'storage');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getListBuilder($entity_type_id) {
        return $this->getHandler($entity_type_id, 'list_builder');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormObject($entity_type_id, $operation) {
        if (!($class = $this->getDefinition($entity_type_id, TRUE)
            ->getFormClass($operation))) {
            throw new InvalidPluginDefinitionException($entity_type_id, sprintf('The "%s" entity type did not specify a "%s" form class.', $entity_type_id, $operation));
        }
        $form_object = $this->classResolver
            ->getInstanceFromDefinition($class);
        return $form_object->setStringTranslation($this->stringTranslation)
            ->setModuleHandler($this->moduleHandler)
            ->setEntityTypeManager($this)
            ->setOperation($operation);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getRouteProviders($entity_type_id) {
        if (!isset($this->handlers['route_provider'][$entity_type_id])) {
            $route_provider_classes = $this->getDefinition($entity_type_id, TRUE)
                ->getRouteProviderClasses();
            foreach ($route_provider_classes as $type => $class) {
                $this->handlers['route_provider'][$entity_type_id][$type] = $this->createHandlerInstance($class, $this->getDefinition($entity_type_id));
            }
        }
        return $this->handlers['route_provider'][$entity_type_id] ?? [];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getViewBuilder($entity_type_id) {
        return $this->getHandler($entity_type_id, 'view_builder');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getAccessControlHandler($entity_type_id) {
        return $this->getHandler($entity_type_id, 'access');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getHandler($entity_type_id, $handler_type) {
        if (!isset($this->handlers[$handler_type][$entity_type_id])) {
            $definition = $this->getDefinition($entity_type_id);
            $class = $definition->getHandlerClass($handler_type);
            if (!$class) {
                throw new InvalidPluginDefinitionException($entity_type_id, sprintf('The "%s" entity type did not specify a %s handler.', $entity_type_id, $handler_type));
            }
            $this->handlers[$handler_type][$entity_type_id] = $this->createHandlerInstance($class, $definition);
        }
        return $this->handlers[$handler_type][$entity_type_id];
    }
    
    /**
     * {@inheritdoc}
     */
    public function createHandlerInstance($class, EntityTypeInterface $definition = NULL) {
        if (is_subclass_of($class, 'Drupal\\Core\\Entity\\EntityHandlerInterface')) {
            $handler = $class::createInstance($this->container, $definition);
        }
        else {
            $handler = new $class($definition);
        }
        if (method_exists($handler, 'setModuleHandler')) {
            $handler->setModuleHandler($this->moduleHandler);
        }
        if (method_exists($handler, 'setStringTranslation')) {
            $handler->setStringTranslation($this->stringTranslation);
        }
        return $handler;
    }

}