Method wrapMapKey

java/dagger/internal/codegen/KeyFactory.java:399–415

If key's type is Map and Foo is not WrappingClass , returns a key with type Map > with the same qualifier. Otherwise returns Optional#empty(). Returns Optional#empty() if WrappingClass is not in the

(Key possibleMapKey, Class<?> wrappingClass)

   * <p>Returns {@link Optional#empty()} if {@code WrappingClass} is not in the classpath.
   */
  private Optional<Key> wrapMapKey(Key possibleMapKey, Class<?> wrappingClass) {
    if (MapType.isMap(possibleMapKey)) {
      MapType mapType = MapType.from(possibleMapKey);
      if (!mapType.isRawType() && !mapType.valuesAreTypeOf(wrappingClass)) {
        TypeElement wrappingElement = getClassElement(wrappingClass);
        if (wrappingElement == null) {
          // This target might not be compiled with Producers, so wrappingClass might not have an
          // associated element.
          return Optional.empty();
        }
        DeclaredType wrappedValueType = types.getDeclaredType(wrappingElement, mapType.valueType());
        return Optional.of(
            possibleMapKey.toBuilder().type(mapOf(mapType.keyType(), wrappedValueType)).build());
      }
    }
    return Optional.empty();
  }

  /**
   * If {@code key}'s type is {@code Set<WrappingClass<Bar>>}, returns a key with type {@code Set