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;
  }

}