code: private function getAnnotation(Reflector $element, $annotation)
      {
          if ($element instanceof ReflectionClass) {
              return $this->reader->getClassAnnotation($element, $annotation);
          } elseif ($element instanceof ReflectionMethod) {
              return $this->reader->getMethodAnnotation($element, $annotation);
          } elseif ($element instanceof ReflectionProperty) {
              return $this->reader->getPropertyAnnotation($element, $annotation);
          }
  
          return null;
      }
docs: Get the specified annotation of an element
  
  @param  Reflector $element    The element whose annotation should be
  retrieved
  @param  string    $annotation The class of the annotation to retrieve
  
  @return object|null The annotation or null if the element doesn't
  have the specified annotation