Method unwrapSetKey

java/dagger/internal/codegen/KeyFactory.java:421–430

If key's type is Set >, returns a key with type Set with the same qualifier. Otherwise returns Optional#empty().

(Key key, Class<?> wrappingClass)

   * <Bar>} with the same qualifier. Otherwise returns {@link Optional#empty()}.
   */
  Optional<Key> unwrapSetKey(Key key, Class<?> wrappingClass) {
    if (SetType.isSet(key)) {
      SetType setType = SetType.from(key);
      if (!setType.isRawType() && setType.elementsAreTypeOf(wrappingClass)) {
        return Optional.of(
            key.toBuilder().type(setOf(setType.unwrappedElementType(wrappingClass))).build());
      }
    }
    return Optional.empty();
  }

  /**
   * If {@code key}'s type is {@code Optional<T>} for some {@code T}, returns a key with the same