/**
  * Inject annotations from configuration, if any.
  *
  * @param array $config
  * @param AnnotationBuilder $builder
  * @return void
  */
 private function injectAnnotations(array $config, AnnotationBuilder $builder)
 {
     if (!isset($config['annotations'])) {
         return;
     }
     $parser = $builder->getAnnotationParser();
     foreach ($config['annotations'] as $fullyQualifiedClassName) {
         $parser->registerAnnotation($fullyQualifiedClassName);
     }
 }