class ConfigFieldMapper

class ConfigFieldMapper extends ConfigEntityMapper {
    
    /**
     * Loaded entity instance to help produce the translation interface.
     *
     * @var \Drupal\field\FieldConfigInterface
     */
    protected $entity;
    
    /**
     * {@inheritdoc}
     */
    public function getBaseRouteParameters() {
        $parameters = parent::getBaseRouteParameters();
        $base_entity_info = $this->entityTypeManager
            ->getDefinition($this->pluginDefinition['base_entity_type']);
        $bundle_parameter_key = $base_entity_info->getBundleEntityType() ?: 'bundle';
        $parameters[$bundle_parameter_key] = $this->entity
            ->getTargetBundle();
        return $parameters;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getOverviewRouteName() {
        return 'entity.field_config.config_translation_overview.' . $this->pluginDefinition['base_entity_type'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTypeLabel() {
        $base_entity_info = $this->entityTypeManager
            ->getDefinition($this->pluginDefinition['base_entity_type']);
        return $this->t('@label fields', [
            '@label' => $base_entity_info->getLabel(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function setEntity(ConfigEntityInterface $entity) {
        if (parent::setEntity($entity)) {
            // Field storage config can also contain translatable values. Add the name
            // of the config as well to the list of configs for this entity.
            
            /** @var \Drupal\field\FieldStorageConfigInterface $field_storage */
            $field_storage = $this->entity
                ->getFieldStorageDefinition();
            
            /** @var \Drupal\Core\Config\Entity\ConfigEntityTypeInterface $entity_type_info */
            $entity_type_info = $this->entityTypeManager
                ->getDefinition($field_storage->getEntityTypeId());
            $this->addConfigName($entity_type_info->getConfigPrefix() . '.' . $field_storage->id());
            return TRUE;
        }
        return FALSE;
    }

}