class EntityConverter

class EntityConverter implements ParamConverterInterface {
    use DeprecatedServicePropertyTrait;
    use DynamicEntityTypeParamConverterTrait;
    
    /**
     * {@inheritdoc}
     */
    protected $deprecatedProperties = [
        'entityManager' => 'entity.manager',
        'languageManager' => 'language_manager',
    ];
    
    /**
     * Entity type manager which performs the upcasting in the end.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Entity repository.
     *
     * @var \Drupal\Core\Entity\EntityRepositoryInterface
     */
    protected $entityRepository;
    
    /**
     * Constructs a new EntityConverter.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
     *   The entity repository.
     *
     * @see https://www.drupal.org/node/2549139
     * @see https://www.drupal.org/node/2938929
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, $entity_repository = NULL) {
        if ($entity_type_manager instanceof EntityManagerInterface) {
            @trigger_error('Passing the entity.manager service to EntityConverter::__construct() is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. Pass the entity_type.manager service instead. See https://www.drupal.org/node/2549139.', E_USER_DEPRECATED);
        }
        $this->entityTypeManager = $entity_type_manager;
        if (!$entity_repository instanceof EntityRepositoryInterface) {
            @trigger_error('Calling EntityConverter::__construct() with the $entity_repository argument is supported in drupal:8.7.0 and will be required before drupal:9.0.0. See https://www.drupal.org/node/2549139.', E_USER_DEPRECATED);
            $entity_repository = \Drupal::service('entity.repository');
        }
        $this->entityRepository = $entity_repository;
    }
    
    /**
     * {@inheritdoc}
     */
    public function convert($value, $definition, $name, array $defaults) {
        $entity_type_id = $this->getEntityTypeFromDefaults($definition, $name, $defaults);
        // If the entity type is revisionable and the parameter has the
        // "load_latest_revision" flag, load the active variant.
        if (!empty($definition['load_latest_revision'])) {
            return $this->entityRepository
                ->getActive($entity_type_id, $value);
        }
        // Do not inject the context repository as it is not an actual dependency:
        // it will be removed once both the TODOs below are fixed.
        
        /** @var \Drupal\Core\Plugin\Context\ContextRepositoryInterface $contexts_repository */
        $contexts_repository = \Drupal::service('context.repository');
        // @todo Consider deprecating the legacy context operation altogether in
        //   https://www.drupal.org/node/3031124.
        $contexts = $contexts_repository->getAvailableContexts();
        $contexts[EntityRepositoryInterface::CONTEXT_ID_LEGACY_CONTEXT_OPERATION] = new Context(new ContextDefinition('string'), 'entity_upcast');
        // @todo At the moment we do not need the current user context, which is
        //   triggering some test failures. We can remove these lines once
        //   https://www.drupal.org/node/2934192 is fixed.
        $context_id = '@user.current_user_context:current_user';
        if (isset($contexts[$context_id])) {
            $account = $contexts[$context_id]->getContextValue();
            unset($account->_skipProtectedUserFieldConstraint);
            unset($contexts[$context_id]);
        }
        $entity = $this->entityRepository
            ->getCanonical($entity_type_id, $value, $contexts);
        return $entity;
    }
    
    /**
     * Returns the latest revision translation of the specified entity.
     *
     * @param \Drupal\Core\Entity\RevisionableInterface $entity
     *   The default revision of the entity being converted.
     * @param string $langcode
     *   The language of the revision translation to be loaded.
     *
     * @return \Drupal\Core\Entity\RevisionableInterface
     *   The latest translation-affecting revision for the specified entity, or
     *   just the latest revision, if the specified entity is not translatable or
     *   does not have a matching translation yet.
     *
     * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0.
     *   Use \Drupal\Core\Entity\EntityRepositoryInterface::getActive() instead.
     */
    protected function getLatestTranslationAffectedRevision(RevisionableInterface $entity, $langcode) {
        @trigger_error('\\Drupal\\Core\\ParamConverter\\EntityConverter::getLatestTranslationAffectedRevision() is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\Core\\Entity\\EntityRepositoryInterface::getActive() instead.', E_USER_DEPRECATED);
        $data_type = 'language';
        $context_id_prefix = '@language.current_language_context:';
        $contexts = [
            $context_id_prefix . LanguageInterface::TYPE_CONTENT => new Context(new ContextDefinition($data_type), $langcode),
            $context_id_prefix . LanguageInterface::TYPE_INTERFACE => new Context(new ContextDefinition($data_type), $langcode),
        ];
        $revision = $this->entityRepository
            ->getActive($entity->getEntityTypeId(), $entity->id(), $contexts);
        // The EntityRepositoryInterface::getActive() method performs entity
        // translation negotiation, but this used to return an untranslated entity
        // object as translation negotiation happened later in ::convert().
        if ($revision instanceof TranslatableInterface) {
            $revision = $revision->getUntranslated();
        }
        return $revision;
    }
    
    /**
     * Loads the specified entity revision.
     *
     * @param \Drupal\Core\Entity\RevisionableInterface $entity
     *   The default revision of the entity being converted.
     * @param string $revision_id
     *   The identifier of the revision to be loaded.
     *
     * @return \Drupal\Core\Entity\RevisionableInterface
     *   An entity revision object.
     *
     * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0.
     */
    protected function loadRevision(RevisionableInterface $entity, $revision_id) {
        @trigger_error('\\Drupal\\Core\\ParamConverter\\EntityConverter::loadRevision() is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0.', E_USER_DEPRECATED);
        // We explicitly perform a loose equality check, since a revision ID may
        // be returned as an integer or a string.
        if ($entity->getLoadedRevisionId() != $revision_id) {
            
            /** @var \Drupal\Core\Entity\RevisionableStorageInterface $storage */
            $storage = $this->entityTypeManager
                ->getStorage($entity->getEntityTypeId());
            return $storage->loadRevision($revision_id);
        }
        else {
            return $entity;
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function applies($definition, $name, Route $route) {
        if (!empty($definition['type']) && strpos($definition['type'], 'entity:') === 0) {
            $entity_type_id = substr($definition['type'], strlen('entity:'));
            if (strpos($definition['type'], '{') !== FALSE) {
                $entity_type_slug = substr($entity_type_id, 1, -1);
                return $name != $entity_type_slug && in_array($entity_type_slug, $route->compile()
                    ->getVariables(), TRUE);
            }
            return $this->entityTypeManager
                ->hasDefinition($entity_type_id);
        }
        return FALSE;
    }
    
    /**
     * Returns a language manager instance.
     *
     * @return \Drupal\Core\Language\LanguageManagerInterface
     *   The language manager.
     *
     * @internal
     */
    protected function languageManager() {
        return $this->__get('languageManager');
    }

}