Hi,
Thanks for your inspiration. What version(lucene 2.4 or 2.9 or
others) are you used in your project. Can you give more details fo
your suggestion, thanks.
Wilson
2009/11/27 fulin tang <tangfu...@gmail.com>:
> Maybe you should take a look at the Scorer and Similarity series
> classes , they will show you how the score is calculated , make some
> change of them, and you will get what you want.
>
> We have the same problem and we get it done by write subclasses of
> DefaultSimilarity and BooleanScorer
>
>
> 2009/11/26 Uwe Schindler <u...@thetaphi.de>:
>> Read the documentation of the Document class: if you set a boost for a
>> document, it is used when indexing the fields and multiplied to each field.
>> For the document itself no boost value is stored, so you cannot get it (only
>> so called stored fields are retrievable).
>>
>> -----
>> Uwe Schindler
>> H.-H.-Meier-Allee 63, D-28213 Bremen
>> http://www.thetaphi.de
>> eMail: u...@thetaphi.de
>>
>>
>>> -----Original Message-----
>>> From: Wilson Wu [mailto:songzi0...@gmail.com]
>>> Sent: Thursday, November 26, 2009 1:01 PM
>>> To: java-user@lucene.apache.org
>>> Subject: Is it a lucene bug?
>>>
>>> Hi,
>>> Recently, there is a requirement to sort the hits by both the
>>> scores of documents and the updateTime which is a field of document to
>>> mark the document's update time. We want the new document in the
>>> front and also want high score document in the front,in other words,
>>> we want to mix the score and updateTime, but not first sort by
>>> one,second by the other. So, I design a time based function f(t) to
>>> calculte each document boost to write into the index store.
>>> The result is that I can caculate a value for each document
>>> based its update time, and the value can influence the document score
>>> through adjusting the fieldNorm value. But when I lookup the boost
>>> value through the method document.getBoost() from every document in
>>> the index store, I found the boost value = 1.0. Which means I can set
>>> a document's boost value and the boost value can adjust the final
>>> score, but I can't read the boost value from the document I have
>>> searched out.
>>> Is it a bug in lucene? Thanks. I use lucene version 2.4.1.
>>> PS: Is there any other way to meet my reqirement? I think it is
>>> not a good idea to adjust document's final score through writing a
>>> document boost into the index store. Because if I want to open two
>>> interfaces to the Client: one is sorting documents only by score which
>>> is just the similarity score and has not been adjusted by boost value
>>> f(t), the other is sorting by final score which has been adjuested by
>>> boost value f(t). Thank a lot!
>>>
>>> wilson
>>>
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>>
>>
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>>
>
>
>
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