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References: 
 <ED081AC9AEEE0248BBCCDE9989AAE3FC02CB1C77@rw-ex2003.BROADVISION.COM>
Date: Wed, 30 Nov 2011 20:39:44 +0100
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 <CAAHmpkjX=CwgF8sQFVwnWi19HXe+xnpSDSx_nd==AJEsDR-+eg@mail.gmail.com>
Subject: Re: Boost more recent document
From: Simon Willnauer <simon.willnauer@googlemail.com>
To: java-user@lucene.apache.org
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On Wed, Nov 30, 2011 at 6:59 PM, Zhang, Lisheng
<Lisheng.Zhang@broadvision.com> wrote:
> Hi,
>
> We need to boost document which is more recent (each doc has time stamp attribute). It seems that
> we cannot use doc boost at index time because it will be condensed into one byte (cannot differentiate
> 365 days), so we may use payload (save time stamp as payload) to boost at search time.
>
> In our app we let user enter query at browser and use QueryParser to generate query, the query can
> be different types (TermQuery, BooleanQuery, WildcardQuery, ...), then it seems we need to create
> each customized query class similar to PayloadTermQuery, is there another simpler way?

you can simply index your timestamp (untokenzied) and wrap your query
in a CustomScoreQuery. This query accepts your user query and a
ValueSource. During search CustomScoreQuery calls your valuesource for
each document that the user query scores and multiplies the result of
the ValueSource into the score. Inside your valuesource you can simply
get the timestamps from the FieldCache and calculate your custom
boost...

hope that helps

simon
>
> Thanks very much for helps, Lisheng

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