enrique.lamas at corp
Aug 7, 2006, 4:05 AM
Post #1 of 2
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lengthNorm method of Similarity not beeing called
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Hi,
I want to execute a query and sort the results in a special way. Seeing the Explanation info returned, I've decided to alter the value that at Explanation is given as fieldNorm. Searching at this maillist, I found this post:
http://www.mail-archive.com/java-user [at] lucene/msg03304.html
At this post Erik says:
"Sure, you can subclass DefaultSimilarity and override and tweak just
the lengthNorm() method. Be sure to use IndexWriter.setSimilarity()
to get your custom one used."
Well, I traced my own method lengthNorm and realized that this method is not being called.
¿Anyone knows what I'm doing wrong?
All other reimplemented Similarity methods are being called, but not lengthNorm.
I'm using Lucene version 1.9.1
These are my pieces of code:
MultiSearcher multi ...
[...]
multi.setSimilarity(new MySimilarity());
QueryParser queryParser = new MultiFieldQueryParser(new String[] {"tags", "title"}, ProcessConstants.analyzer);
Query query = queryParser.parse("rocio ortega");
Hits hits = multi.search(query, new Sort(new SortField[]{
SortField.FIELD_SCORE,
new SortField("formatted-date", SortField.STRING, true)}));
for (int i = 0; i < hits.length(); i++) {
org.apache.lucene.document.Document docIndex = hits.doc(i);
Explanation explanation = multi.explain(query, hits.id(i));
System.err.println("explanation: " + explanation.toString());
}
[...]
public class MySimilarity extends DefaultSimilarity{
public MySimilarity(){
super();
}
[...]
public float lengthNorm(String arg0, int arg1) {
//System.err.println("**** lengthNorm");
return super.lengthNorm(arg0, arg1);
}
}
Thanks
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