core/src/com/google/inject/Key.java
static AnnotationStrategy strategyFor(Annotation annotation) {
    checkNotNull(annotation, "annotation");
    Class<? extends Annotation> annotationType = annotation.annotationType();
    ensureRetainedAtRuntime(annotationType);
    ensureIsBindingAnnotation(annotationType);

    if (Annotations.isMarker(annotationType)) {
      return new AnnotationTypeStrategy(annotationType, annotation);
    }

    return new AnnotationInstanceStrategy(Annotations.canonicalizeIfNamed(annotation));
  }
static AnnotationStrategy strategyFor(Annotation annotation) {
    checkNotNull(annotation, "annotation");
    Class<? extends Annotation> annotationType = annotation.annotationType();
    ensureRetainedAtRuntime(annotationType);
    ensureIsBindingAnnotation(annotationType);

    if (Annotations.isMarker(annotationType)) {
      return new AnnotationTypeStrategy(annotationType, annotation);
    }

    return new AnnotationInstanceStrategy(Annotations.canonicalizeIfNamed(annotation));
  }
Gets the strategy for an annotation.