class FieldConfigStorage

class FieldConfigStorage extends FieldConfigStorageBase {
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The field type plugin manager.
     *
     * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
     */
    protected $fieldTypeManager;
    
    /**
     * The deleted fields repository.
     *
     * @var \Drupal\Core\Field\DeletedFieldsRepositoryInterface
     */
    protected $deletedFieldsRepository;
    
    /**
     * Constructs a FieldConfigStorage object.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory service.
     * @param \Drupal\Component\Uuid\UuidInterface $uuid_service
     *   The UUID service.
     * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
     *   The language manager.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Field\FieldTypePluginManagerInterface $field_type_manager
     *   The field type plugin manager.
     * @param \Drupal\Core\Field\DeletedFieldsRepositoryInterface $deleted_fields_repository
     *   The deleted fields repository.
     * @param \Drupal\Core\Cache\MemoryCache\MemoryCacheInterface $memory_cache
     *   The memory cache.
     */
    public function __construct(EntityTypeInterface $entity_type, ConfigFactoryInterface $config_factory, UuidInterface $uuid_service, LanguageManagerInterface $language_manager, EntityTypeManagerInterface $entity_type_manager, FieldTypePluginManagerInterface $field_type_manager, DeletedFieldsRepositoryInterface $deleted_fields_repository, MemoryCacheInterface $memory_cache) {
        parent::__construct($entity_type, $config_factory, $uuid_service, $language_manager, $memory_cache);
        $this->entityTypeManager = $entity_type_manager;
        $this->fieldTypeManager = $field_type_manager;
        $this->deletedFieldsRepository = $deleted_fields_repository;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($entity_type, $container->get('config.factory'), $container->get('uuid'), $container->get('language_manager'), $container->get('entity_type.manager'), $container->get('plugin.manager.field.field_type'), $container->get('entity_field.deleted_fields_repository'), $container->get('entity.memory_cache'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function importDelete($name, Config $new_config, Config $old_config) {
        // If the field storage has been deleted in the same import, the field will
        // be deleted by then, and there is nothing left to do. Just return TRUE so
        // that the file does not get written to active store.
        if (!$old_config->get()) {
            return TRUE;
        }
        return parent::importDelete($name, $new_config, $old_config);
    }
    
    /**
     * {@inheritdoc}
     */
    public function loadByProperties(array $conditions = []) {
        // Include deleted fields if specified in the $conditions parameters.
        $include_deleted = $conditions['include_deleted'] ?? FALSE;
        unset($conditions['include_deleted']);
        $fields = [];
        // Get fields stored in configuration. If we are explicitly looking for
        // deleted fields only, this can be skipped, because they will be
        // retrieved from the deleted fields repository below.
        if (empty($conditions['deleted'])) {
            if (isset($conditions['entity_type']) && isset($conditions['bundle']) && isset($conditions['field_name'])) {
                // Optimize for the most frequent case where we do have a specific ID.
                $id = $conditions['entity_type'] . '.' . $conditions['bundle'] . '.' . $conditions['field_name'];
                $fields = $this->loadMultiple([
                    $id,
                ]);
            }
            else {
                // No specific ID, we need to examine all existing fields.
                $fields = $this->loadMultiple();
            }
        }
        // Merge deleted fields from the deleted fields repository if needed.
        if ($include_deleted || !empty($conditions['deleted'])) {
            $deleted_field_definitions = $this->deletedFieldsRepository
                ->getFieldDefinitions();
            foreach ($deleted_field_definitions as $id => $field_definition) {
                if ($field_definition instanceof FieldConfigInterface) {
                    $fields[$id] = $field_definition;
                }
            }
        }
        // Collect matching fields.
        $matching_fields = [];
        foreach ($fields as $field) {
            // Some conditions are checked against the field storage.
            $field_storage = $field->getFieldStorageDefinition();
            // Only keep the field if it matches all conditions.
            foreach ($conditions as $key => $value) {
                // Extract the actual value against which the condition is checked.
                switch ($key) {
                    case 'field_name':
                        $checked_value = $field_storage->getName();
                        break;
                    case 'field_id':
                    case 'field_storage_uuid':
                        $checked_value = $field_storage->uuid();
                        break;
                    case 'uuid':
                        $checked_value = $field->uuid();
                        break;
                    case 'deleted':
                        $checked_value = $field->isDeleted();
                        break;
                    default:
                        $checked_value = $field->get($key);
                        break;
                }
                // Skip to the next field as soon as one condition does not match.
                if ($checked_value != $value) {
                    continue 2;
                }
            }
            // When returning deleted fields, key the results by UUID since they
            // can include several fields with the same ID.
            $key = $include_deleted ? $field->uuid() : $field->id();
            $matching_fields[$key] = $field;
        }
        return $matching_fields;
    }

}