Method unwrapValue

java/dagger/internal/codegen/MapKeys.java:83–90

Returns the annotation value if mapKey's type is annotated with MapKey @MapKey(unwrapValue = true). @throws IllegalArgumentException if mapKey's type is not annotated with MapKey @MapKey at all.

(AnnotationMirror mapKey)

   *     {@link MapKey @MapKey} at all.
   */
  static Optional<? extends AnnotationValue> unwrapValue(AnnotationMirror mapKey) {
    MapKey mapKeyAnnotation = mapKey.getAnnotationType().asElement().getAnnotation(MapKey.class);
    checkArgument(
        mapKeyAnnotation != null, "%s is not annotated with @MapKey", mapKey.getAnnotationType());
    return mapKeyAnnotation.unwrapValue()
        ? Optional.of(getOnlyElement(getAnnotationValuesWithDefaults(mapKey).values()))
        : Optional.empty();
  }

  static TypeMirror mapKeyType(AnnotationMirror mapKeyAnnotation, Types types) {
    return unwrapValue(mapKeyAnnotation).isPresent()