--- /dev/null
+<?php
+
+namespace Drupal\config_translation;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Configuration mapper for fields.
+ *
+ * On top of plugin definition values on ConfigEntityMapper, the plugin
+ * definition for field mappers are required to contain the following
+ * additional keys:
+ * - base_entity_type: The name of the entity type the fields are attached to.
+ */
+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 = $this->entityManager->getDefinition($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 = $this->entityManager->getDefinition($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 = $this->entityManager->getDefinition($field_storage->getEntityTypeId());
+ $this->addConfigName($entity_type_info->getConfigPrefix() . '.' . $field_storage->id());
+ return TRUE;
+ }
+ return FALSE;
+ }
+
+}