Method getMapKey

java/dagger/internal/codegen/MapKeys.java:62–67

If bindingElement is annotated with a MapKey annotation, returns it. @throws IllegalArgumentException if the element is annotated with more than one MapKey annotation

(Element bindingElement)

   *     annotation
   */
  static Optional<AnnotationMirror> getMapKey(Element bindingElement) {
    ImmutableSet<? extends AnnotationMirror> mapKeys = getMapKeys(bindingElement);
    return mapKeys.isEmpty()
        ? Optional.empty()
        : Optional.<AnnotationMirror>of(getOnlyElement(mapKeys));
  }

  /**
   * Returns all of the {@link MapKey} annotations that annotate {@code bindingElement}.