EntityFieldManager::buildBundleFieldDefinitions

protected EntityFieldManager::buildBundleFieldDefinitions($entity_type_id, $bundle, array $base_field_definitions)

protected function buildBundleFieldDefinitions($entity_type_id, $bundle, array $base_field_definitions) {
  $entity_type = $this->entityTypeManager->getDefinition($entity_type_id);
  $class = $entity_type->getClass();

  // Allow the entity class to provide bundle fields and bundle-specific
  // overrides of base fields.
  $bundle_field_definitions = $class::bundleFieldDefinitions($entity_type, $bundle, $base_field_definitions);

  // Load base field overrides from configuration. These take precedence over
  // base field overrides returned above.
  $base_field_override_ids = array_map(function($field_name) use ($entity_type_id, $bundle) {
    return $entity_type_id . '.' . $bundle . '.' . $field_name;
  }, array_keys($base_field_definitions));
  $base_field_overrides = $this->entityTypeManager->getStorage('base_field_override')->loadMultiple($base_field_override_ids);
  foreach ($base_field_overrides as $base_field_override) {
    /** @var \Drupal\Core\Field\Entity\BaseFieldOverride $base_field_override */
    $field_name = $base_field_override->getName();
    $bundle_field_definitions[$field_name] = $base_field_override;
  }

  $provider = $entity_type->getProvider();
  foreach ($bundle_field_definitions as $definition) {
    // @todo Remove this check once FieldDefinitionInterface exposes a proper
    //  provider setter. See https://www.drupal.org/node/2225961.
    if ($definition instanceof BaseFieldDefinition) {
      $definition->setProvider($provider);
    }
  }

  // Retrieve base field definitions from modules.
  foreach ($this->moduleHandler->getImplementations('entity_bundle_field_info') as $module) {
    $module_definitions = $this->moduleHandler->invoke($module, 'entity_bundle_field_info', [$entity_type, $bundle, $base_field_definitions]);
    if (!empty($module_definitions)) {
      // Ensure the provider key actually matches the name of the provider
      // defining the field.
      foreach ($module_definitions as $field_name => $definition) {
        // @todo Remove this check once FieldDefinitionInterface exposes a
        //  proper provider setter. See https://www.drupal.org/node/2225961.
        if ($definition instanceof BaseFieldDefinition) {
          $definition->setProvider($module);
        }
        $bundle_field_definitions[$field_name] = $definition;
      }
    }
  }

  // Automatically set the field name, target entity type and bundle
  // for non-configurable fields.
  foreach ($bundle_field_definitions as $field_name => $field_definition) {
    if ($field_definition instanceof BaseFieldDefinition) {
      $field_definition->setName($field_name);
      $field_definition->setTargetEntityTypeId($entity_type_id);
      $field_definition->setTargetBundle($bundle);
    }
  }

  // Invoke 'per bundle' alter hook.
  $this->moduleHandler->alter('entity_bundle_field_info', $bundle_field_definitions, $entity_type, $bundle);

  return $bundle_field_definitions;
}