class MongoQueryTranslator extends
        AbstractQueryTranslator<DBObject, DBObject, DBObject> implements
        QueryTranslator<DBObject, DBObject, DBObject> {

    @Override
    public DBObject isEmpty(String fieldName) {
        return or(exists(fieldName, false), eq(fieldName, ""));
    }

    public  MongoQueryTranslator(PropertyResolver propertyResolver);

}