@Override
    public boolean isMyQualifierType(DfType type) {
      TypeConstraint constraint = TypeConstraint.fromDfType(type);
      return constraint.isExact(JAVA_UTIL_OPTIONAL) ||
             constraint.isExact(OptionalUtil.OPTIONAL_DOUBLE) ||
             constraint.isExact(OptionalUtil.OPTIONAL_INT) ||
             constraint.isExact(OptionalUtil.OPTIONAL_LONG) ||
             constraint.isSubtypeOf(OptionalUtil.GUAVA_OPTIONAL);
    }
@Override
    public boolean isMyQualifierType(DfType type)