Enum NullAnnotationStrategy

core/src/com/google/inject/Key.java:388–415

  }

  static enum NullAnnotationStrategy implements AnnotationStrategy {
    INSTANCE;

    @Override
    public boolean hasAttributes() {
      return false;
    }

    @Override
    public AnnotationStrategy withoutAttributes() {
      throw new UnsupportedOperationException("Key already has no attributes.");
    }

    @Override
    public Annotation getAnnotation() {
      return null;
    }

    @Override
    public Class<? extends Annotation> getAnnotationType() {
      return null;
    }

    @Override
    public String toString() {
      return "[none]";
    }
  }

  // this class not test-covered
  static class AnnotationInstanceStrategy implements AnnotationStrategy {