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From "none none" <kor...@lycos.com>
Subject Re: MultiTermQuery question
Date Mon, 24 Feb 2003 15:47:16 GMT
 yes, ok , i understod... but, are you telling me Lucene is going backward instead of forward?
in the previous release was possible get terms from a MultiTermQuery, now not anymore? 
i think there has to be a way to get Term from those query that extends MultiTermQuery.
Anybody can help please?
thank you.

--

On Mon, 24 Feb 2003 07:38:03  
 Tatu Saloranta wrote:
>On Monday 24 February 2003 04:39, none none wrote:
>> hi,
>> i saw some changes on the MultiTermQuery, it is abstract and there is no
>> getQuery() anymore. How do i get all the terms from all the classes that
>> extends MultiTermQuery ?? Anybody can help me? i am moving my software to
>> latest version, currently is 1.2 in my application. thank you.
>
>It would be nice if all queries would have a method that allows terms to be 
>collected, ie. so that Query base class would have an abstract method.
>Visitor pattern might make most sense; so we could have a TermCollector 
>object, and queries could have method like:
>
>void collectTerms(TermCollector c)
>
>which would do something like
>
>c.collectTerm(t, this);
>
>for each term it contains, and/or
>
>q.collectTerms(c)
>
>for each sub-query it contains, to get terms recursively.
>
>Then, TermCollector would need to define 'collectTerm(Term t, Query q);' to
>collect all terms, and have method(s) for getting all terms plus resetting it 
>(if it's to be reused). Some TermCollectors could also keep track of queries 
>terms came from, to allow keeping track of phrase query term dependencies 
>etc. etc.
>Using visitor would be more elegant than having to check class types and casts 
>when traversing. Plus, when adding new queries, would only need to add that 
>one method, and visitors would still work ok.
>
>... having described this, I probably should just go and implement it I guess. 
>:-)
>
>-+ Tatu +-
>
>
>
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