Hi Franz,
The likely problem is that you're using an index-time analyzer that strips out
the parentheses. StandardAnalyzer, for example, does this; WhitespaceAnalyzer
does not.
Remember that hits are the result of matches between index-analyzed terms and
query-analyzed terms. Except in the case of synonyms, most people will want
their index and query analyzers to be the same.
Steve
________________________________________
From: Franz Roth [franzr...@gmx.de]
Sent: Wednesday, April 14, 2010 7:42 AM
To: java-user@lucene.apache.org
Subject: PrefixQuery and special characters
Hi all,
say I have an Index with one field named "category". There are two documents
one with value "(testvalue)" and one with value "test value".
Now somone search with "test". My Searchenine uses the
org.apache.lucene.search.PrefixQuery and finds 2 documents. Maybe he estimated
only one hit; owever: if he searches for "(test" and the Searchengine uses the
QueryParser.escape to clean the request and takes that PrefixQuery to search
nothing results.
How can I search for the document "(testvalue)" and only this one?
Thx!
package foo.bar;
import java.io.IOException;
import junit.framework.TestCase;
import org.apache.log4j.Logger;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.store.RAMDirectory;
public class TestPrefixQuery extends TestCase {
public void testEscapeAndPrefix() throws CorruptIndexException,
LockObtainFailedException, IOException {
RAMDirectory directory = new RAMDirectory();
IndexWriter writer = new IndexWriter(directory, new
StandardAnalyzer(),
true, IndexWriter.MaxFieldLength.LIMITED);
Document doc = new Document();
doc.add(new Field("category", "(testvalue)", Field.Store.YES,
Field.Index.ANALYZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("category", "test value", Field.Store.YES,
Field.Index.ANALYZED));
writer.addDocument(doc);
writer.close();
String value= "test";
PrefixQuery query = new PrefixQuery(new Term("category", value));
//log.debug(query.toString());
IndexSearcher searcher = new IndexSearcher(directory);
ScoreDoc[] hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("One for " + value , 2, hits.length); //I want one for
this?!
value= "(test";
String escaped = QueryParser.escape(value);
query = new PrefixQuery(new Term("category", escaped));
//log.debug(query.toString());
hits = searcher.search(query, null, 1000).scoreDocs;
assertEquals("One for " + value + "/" + escaped, 1, hits.length);
//FAILS!
}
}
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