class EntityNormalizer

class EntityNormalizer extends ComplexDataNormalizer implements DenormalizerInterface {
    use FieldableEntityNormalizerTrait;
    
    /**
     * Constructs an EntityNormalizer object.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Entity\EntityTypeRepositoryInterface $entity_type_repository
     *   The entity type repository.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface $entity_field_manager
     *   The entity field manager.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, EntityTypeRepositoryInterface $entity_type_repository, EntityFieldManagerInterface $entity_field_manager) {
        $this->entityTypeManager = $entity_type_manager;
        $this->entityTypeRepository = $entity_type_repository;
        $this->entityFieldManager = $entity_field_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public function denormalize($data, $class, $format = NULL, array $context = []) : mixed {
        $entity_type_id = $this->determineEntityTypeId($class, $context);
        $entity_type_definition = $this->getEntityTypeDefinition($entity_type_id);
        // The bundle property will be required to denormalize a bundleable
        // fieldable entity.
        if ($entity_type_definition->entityClassImplements(FieldableEntityInterface::class)) {
            // Extract bundle data to pass into entity creation if the entity type uses
            // bundles.
            if ($entity_type_definition->hasKey('bundle')) {
                // Get an array containing the bundle only. This also remove the bundle
                // key from the $data array.
                $create_params = $this->extractBundleData($data, $entity_type_definition);
            }
            else {
                $create_params = [];
            }
            // Create the entity from bundle data only, then apply field values after.
            $entity = $this->entityTypeManager
                ->getStorage($entity_type_id)
                ->create($create_params);
            $this->denormalizeFieldData($data, $entity, $format, $context);
        }
        else {
            // Create the entity from all data.
            $entity = $this->entityTypeManager
                ->getStorage($entity_type_id)
                ->create($data);
        }
        // Pass the names of the fields whose values can be merged.
        // @todo https://www.drupal.org/node/2456257 remove this.
        $entity->_restSubmittedFields = array_keys($data);
        return $entity;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getSupportedTypes(?string $format) : array {
        return [
            EntityInterface::class => TRUE,
        ];
    }

}