code: public Operator createTopicLikeOperator(Selector ar, String pattern)
    {
    Object parsed = TopicPattern.parsePattern(pattern);
    if (parsed == Pattern.matchMany)
      return createOperator(Selector.NOT, createOperator(Selector.ISNULL, ar));
    else if (parsed instanceof String)
      return createOperator(Selector.EQ, ar, createLiteral(parsed));
    else
      return new LikeOperatorImpl(Selector.TOPIC_LIKE, ar, (Pattern) parsed, pattern,
        false, (char) 0);
    }
docs: Implement createTopicLikeOperator