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Date: Tue, 03 May 2011 15:29:28 +0100
From: Paul Taylor <paul_t100@fastmail.fm>
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To: Robert Muir <rcmuir@gmail.com>
CC: java-user@lucene.apache.org
Subject: Re: Problem modifying Similarity class to work with lucene 3.1.0
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On 03/05/2011 15:06, Robert Muir wrote:
> On Tue, May 3, 2011 at 9:57 AM, Paul Taylor<paul_t100@fastmail.fm>  wrote:
>> How can I convert this Similariity method to use 3.1 (currently using
>> 3.0.3), I understand I have to replace lengthNorm() wuth computerNorm() ,
>> but fieldlName is not a provided parameter in computerNorm() and
>> FieldInvertState does not contain the fieldname either.
> Hi, I think you made a mistake, it does take fieldname:
>
> http://lucene.apache.org/java/3_1_0/api/core/org/apache/lucene/search/Similarity.html#computeNorm(java.lang.String,
> org.apache.lucene.index.FieldInvertState)
>
Doh thanks, not having a good few days, trying to do to much at once.

I assume this would be the correct way to fix the code for 3.1.0

public float computeNorm(String field, FieldInvertState state) {


         //This will match both artist and label aliases and is 
applicable to both, didn't use the constant
         //ArtistIndexField.ALIAS because that would be confusing
         if (field.equals("alias")) {
             return state.getBoost() * 0.578f; //Same result as normal 
calc if field had three terms the most common scenario
         }
         else
         {
             return super.computeNorm(field,state);
         }
     }


Paul

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