class FieldConfigStorageBase

abstract class FieldConfigStorageBase extends ConfigEntityStorage {
    
    /**
     * The field type plugin manager.
     *
     * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
     */
    protected $fieldTypeManager;
    
    /**
     * {@inheritdoc}
     */
    protected function mapFromStorageRecords(array $records) {
        foreach ($records as $id => &$record) {
            try {
                $class = $this->fieldTypeManager
                    ->getPluginClass($record['field_type']);
            } catch (PluginNotFoundException $e) {
                $config_id = $this->getPrefix() . $id;
                throw new PluginNotFoundException($record['field_type'], "Unable to determine class for field type '{$record['field_type']}' found in the '{$config_id}' configuration", $e->getCode(), $e);
            }
            $record['settings'] = $class::fieldSettingsFromConfigData($record['settings']);
        }
        return parent::mapFromStorageRecords($records);
    }
    
    /**
     * {@inheritdoc}
     */
    protected function mapToStorageRecord(EntityInterface $entity) {
        $record = parent::mapToStorageRecord($entity);
        $class = $this->fieldTypeManager
            ->getPluginClass($record['field_type']);
        $record['settings'] = $class::fieldSettingsToConfigData($record['settings']);
        return $record;
    }

}