Hallo Paul,
I implemented what you wanted in the applied testcase. Works without
problems. Your error was, that in the TermQuery creation you placed a
precisionStep in the shift value parameter which is incorrect.
By the way: Lucene 2.9.1 and Lucene 3.0 will be optimized for ranges like [1
TO 1], because this is now as fast as a TermQuery, but you can
NumericRangeQuery for it (and do not need to encode the terms). Just replace
the TermQuery with NumericUtils in the newTermQuery method by a
NumericRangeQuery with upper and lower bound equal (and not exclusive).
Please note: negative numbers in the query parser may lead to problems,
because of this they needed to be placed in "" ("-" is the sign for
exclusion terms). The test may fail with other Analyzers that corrupt your
numbers.
Uwe
> -----Original Message-----
> From: Uwe Schindler [mailto:u...@thetaphi.de]
> Sent: Monday, October 12, 2009 5:49 PM
> To: java-user@lucene.apache.org; paul_t...@fastmail.fm
> Subject: RE: How do you properly use NumericField
>
> Can you print the upper and lower term or the term you received in
> newRangeQuery and newTermQuery also to System.out? Maybe it is converted
> somehow by your Analyzer, that is used for parsing the query.
>
> -----
> Uwe Schindler
> H.-H.-Meier-Allee 63, D-28213 Bremen
> http://www.thetaphi.de
> eMail: u...@thetaphi.de
>
>
> > -----Original Message-----
> > From: Paul Taylor [mailto:paul_t...@fastmail.fm]
> > Sent: Monday, October 12, 2009 1:00 PM
> > To: java-user@lucene.apache.org
> > Subject: Re: How do you properly use NumericField
> >
> > Uwe Schindler wrote:
> > > I forgot: The format of numeric fields is also not plain text, because
> > of
> > > this a simple TermQuery as generated by your query parser will not
> work,
> > > too.
> > >
> > > If you want to hit numeric values without a NumericRangeQuery with
> lower
> > and
> > > upper bound equal, you have to use NumericUtils to translate the term
> > text,
> > > e.g. new TermQuery(new Term("field",
> > > NumericUtils.intToPrefixCoded(value,precstep)))
> > >
> > > If you want support for this in QueryParser, you have to override
> > > QueryParser.newTermQuery as explained before for newRangeQuery. By the
> > way,
> > > Solr does this in exactly that way.
> > >
> > > Uwe
> > >
> >
> > Ok, Im trying my best here but still cannot get range or single term
> > query searching to work.
> >
> > package org.musicbrainz.search.servlet;
> >
> > import junit.framework.TestCase;
> > import org.apache.lucene.analysis.Analyzer;
> > import org.apache.lucene.document.Document;
> > import org.apache.lucene.document.NumericField;
> > import org.apache.lucene.index.IndexWriter;
> > import org.apache.lucene.index.Term;
> > import org.apache.lucene.queryParser.QueryParser;
> > import org.apache.lucene.search.*;
> > import org.apache.lucene.store.RAMDirectory;
> > import org.apache.lucene.util.NumericUtils;
> > import org.musicbrainz.search.index.TrackAnalyzer;
> >
> > public class NumericFieldTest extends TestCase {
> >
> > public void testNumericFields() throws Exception {
> > Analyzer analyzer = new TrackAnalyzer();
> > RAMDirectory dir = new RAMDirectory();
> > IndexWriter writer = new IndexWriter(dir, analyzer, true,
> > IndexWriter.MaxFieldLength.LIMITED);
> > Document doc = new Document();
> > NumericField nf = new NumericField("dur");
> > nf.setIntValue(123);
> > writer.addDocument(doc);
> > writer.close();
> >
> > IndexSearcher searcher = new IndexSearcher(dir,true);
> > {
> >
> > Query q = new
> > MusicbrainzQueryParser("dur",analyzer).parse("[12 TO 124]");
> > assertEquals(1, searcher.search(q,10).totalHits);
> >
> >
> > q = new MusicbrainzQueryParser("dur",analyzer).parse("123");
> > assertEquals(1, searcher.search(q,10).totalHits);
> >
> >
> > }
> > }
> >
> > static class MusicbrainzQueryParser extends QueryParser {
> >
> > public MusicbrainzQueryParser(String field, Analyzer a) {
> > super(field, a);
> > System.out.println("init parser");
> > }
> >
> > public Query newRangeQuery(String field,
> > String part1,
> > String part2,
> > boolean inclusive)
> > {
> > System.out.println("RangeQuery");
> > TermRangeQuery query = (TermRangeQuery)
> > super.newRangeQuery(field, part1, part2,
> > inclusive);
> >
> > if ("dur".equals(field)) {
> > System.out.println("durRangeQuery");
> >
> > return NumericRangeQuery.newIntRange(
> > "dur",
> > Integer.parseInt(query.getLowerTerm()),
> > Integer.parseInt(query.getUpperTerm()),
> > query.includesLower(),
> > query.includesUpper());
> > } else {
> > return query;
> > }
> > }
> >
> > protected Query newTermQuery(Term term)
> > {
> > System.out.println("newTermQuery");
> > if(term.field().equals("dur")) {
> > System.out.println("dur,newTermQuery");
> > TermQuery tq = new TermQuery(new Term("field",
> >
> >
> NumericUtils.intToPrefixCoded(Integer.parseInt(term.text()),NumericUtils.P
> > RECISION_STEP_DEFAULT)));
> > return tq;
> > }
> > else {
> > return super.newTermQuery(term);
> > }
> > }
> > }
> >
> > }
> >
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>
>
>
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