create a non-Porter Stemming analyzer for DSpace
------------------------------------------------
Key: DS-849
URL: https://jira.duraspace.org/browse/DS-849
Project: DSpace
Issue Type: Improvement
Components: Documentation, DSpace API
Affects Versions: 1.7.0, 1.6.2, 1.6.1, 1.6.0, 1.5.2, 1.5.1, 1.5.0
Reporter: Hardy Pottinger
Attachments: DS-disable-porter-stemming.patch
For some use cases for DSpace, the index produced by the standard search
analyzer (org.dspace.search.DSAnalyzer) produces unsatisfactorily imprecise
results. Creating an alternate analyzer, which omits PorterStemFilter, will be
helpful in those use cases. See these threads for more of the backstory:
http://comments.gmane.org/gmane.comp.db.dspace.user/13404
http://comments.gmane.org/gmane.comp.db.dspace.user/13407
http://comments.gmane.org/gmane.comp.db.dspace.user/13420
http://comments.gmane.org/gmane.comp.db.dspace.user/13427
I'm attaching a patch, but it's more of a kit. You must first copy
[dspace-src]/dspace-api/src/main/java/org/dspace/search/DSAnalyzer.java to
[dspace-src]/dspace-api/src/main/java/org/dspace/search/DSNonStemmingAnalyzer.java,
then you can apply the patch.
After patching, you must alter your dspace.cfg file, uncommenting and changing
the search.analyzer line so that it reads:
search.analyzer = org.dspace.search.DSNonStemmingAnalyzer
Then, do the following:
* stop Tomcat (taking down your DSpace instance)
* re-index all content in your DSpace by running:
[dspace]/bin/dspace index-init
* start Tomcat
* test
All credit for this work goes to Tim Donohue and Stuart Yeates, I just put the
pieces together into this patch and ticket.
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