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Subject: HELP in QueyParsing !!
Date: Mon, 14 Jul 2003 13:54:39 +0530
Message-ID: <9002F5518DF72C4B869259B65E81D8540F5467AA@kecmsg03.ad.infosys.com>
Thread-Topic: HELP in QueyParsing !!
Thread-Index: AcNJ4V1DonyTQhnOToOheonSPIMkWA==
From: "Bharatbhushan_Shetty" <Bharatbhushan_Shetty@infosys.com>
To: "Lucene Users List" <lucene-user@jakarta.apache.org>
Cc: <Bharatbhushan_shetty@yahoo.com>

Hi=20

Need some help in queryparsing. There are few things that doesn't
Seem to work as I expected. Have a look at the code at the end=20
Before reading my observations.

Document contains following information:
D1 =3D c++ hello bharat
D2 =3D c hello sharat=20
D3 =3D hello bharat

Observations
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Input:   QueryCreated     Remarks
c\+\+      c           (Escape character not working)
c++        -           (Parser throws an exception) [NOTE-1]
c*         c*          (Wild card works perfectly fine)
*c         -           (throws an exception -   [NOTE-2]
                       (org.apache.lucene.queryParser.TokenMgrError:)
"c         -           (throws an exception - [NOTE-3]
Hello ""   -           (throws an exception)


[NOTE-1] : - ( ) { } ! [ ] etc characters behave in the same manner=20
          as "+" shown above.
[NOTE-2] : Looks like wildcard cannot be the first character of the
           query

[NOTE-3] : I guess this validation can be done after accepting user
           input.=20


My Comments/Questions
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Does that mean that the program should taken care of validating the=20
User input and then pass the query string to QueryParser?

If yes, I guess there might be some more validations that should be=20
Done that I have missed out. Can anyone throw some light on those
Validations that the program should take care?


Code
=3D=3D=3D=3D

import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;

import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.analysis.*;
import org.apache.lucene.document.*;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;

public class TestQueryParser
{
  public static void main(String[] argv)
  {
    try
    {
      IndexWriter writer =3D new IndexWriter("indexbbs", new
StandardAnalyzer(), true);
 =20
      Document d1 =3D new Document();
      d1.add(Field.Text("f1", "c++ hello bharat"));
      writer.addDocument(d1);
 =20
      Document d2 =3D new Document();
      d2.add(Field.Text("f1", "c hello sharat"));
      writer.addDocument(d2);
 =20
      Document d3 =3D new Document();
      d3.add(Field.Text("f1", "hello bharat"));
      writer.addDocument(d3);
 =20
      writer.optimize();
      writer.close();
 =20
      String qString =3D "";
      try
      {
        BufferedReader in =3D new BufferedReader(new
InputStreamReader(System.in));
        System.out.print("Input for f1: ");
        qString =3D in.readLine();
      }
      catch(Exception e)
      { System.out.println("Exiting..." + e.getMessage()); return; }
 =20
      System.out.println("");
 =20
      Searcher searcher =3D new IndexSearcher("indexbbs");
      Analyzer analyzer =3D new StandardAnalyzer();

      QueryParser qp =3D new QueryParser("f1", analyzer);
 =20
      Query query =3D qp.parse(qString);
=20
      System.out.println("QueryInput:" + qString);
      System.out.println("QueryCreated:" + query.toString("f1"));
 =20
      Hits hits =3D searcher.search(query);
      for (int i=3D0; i<hits.length(); ++i)
        System.out.println("Document =3D f1:" + hits.doc(i).get("f1"));
    }
    catch(Exception e)
    { System.out.println("Exception:" + e.getMessage());return; }=20
  }
}

Thanks=20
Bharat

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