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Date: Wed, 14 Apr 2010 13:42:09 +0200
From: "Franz Roth" <franzroth@gmx.de>
Message-ID: <20100414114209.294260@gmx.net>
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Subject: PrefixQuery and special characters
To: java-user@lucene.apache.org
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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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