Hi Sue,
Search analysis, filtering, stemming etc. is done by Apache Lucene, but there
is a “DSAnalyzer” supplied by default with Dspace, The quickest way to achieve
what you want may be to just comment out the steps you don’t want carried out
in org.dspace.search.DSAnalyzer:
This function is the one you want to modify:
/*
* Create a token stream for this analyzer.
*/
public final TokenStream tokenStream(String fieldName, final Reader reader)
{
TokenStream result = new DSTokenizer(reader);
result = new StandardFilter(result);
result = new LowerCaseFilter(result);
result = new StopFilter(result, stopSet);
result = new PorterStemFilter(result); // THIS IS THE CALL TO THE
STEMMER
return result;
}
The PorterStemFilter() call at the end is the stemmer you’re talking about, and
the StopFilter ignores common conjunctions, pronouns etc. – I would recommend
at least keeping the StandardFilter and LowerCaseFilter.
I haven’t tried exactly what you’re asking about, so I can’t guarantee results,
but I have successfully added new filter steps without any hassles.
Cheers,
Kim
--
Kim Shepherd
IRR Technical Specialist
ITS Systems & Development
The University of Waikato
New Zealand
DDI +64 7 838 4025
From: Thornton, Susan M. (LARC-B702)[RAYTHEON TECHNICAL SERVICES COMPANY]
[mailto:susan.m.thorn...@nasa.gov]
Sent: Wednesday, 9 September 2009 11:10 a.m.
To: dspace-tech@lists.sourceforge.net
Subject: [Dspace-tech] Can "Stemming" be turned off in DSpace Lucenesearches?
We are trying to figure out an easy way to turn off stemming in DSpace
searches. Can anyone point me in the right direction?
Thanks in advance,
Sue
Sue Walker-Thornton
ConITS Contract
NASA Langley Research Center
Integrated Library Systems Application & Database Administrator
130 Research Drive
Hampton, VA 23666
Office: (757) 224-4074
Fax: (757) 224-4001
Pager: (757) 988-2547
Email: susan.m.thorn...@nasa.gov <mailto:susan.m.thorn...@nasa.gov>
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