Hi
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
Before reading my observations.
Document contains following information:
D1 = c++ hello bharat
D2 = c hello sharat
D3 = hello bharat
Observations
============
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
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.
My Comments/Questions
=====================
Does that mean that the program should taken care of validating the
User input and then pass the query string to QueryParser?
If yes, I guess there might be some more validations that should be
Done that I have missed out. Can anyone throw some light on those
Validations that the program should take care?
Code
====
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 = new IndexWriter("indexbbs", new
StandardAnalyzer(), true);
Document d1 = new Document();
d1.add(Field.Text("f1", "c++ hello bharat"));
writer.addDocument(d1);
Document d2 = new Document();
d2.add(Field.Text("f1", "c hello sharat"));
writer.addDocument(d2);
Document d3 = new Document();
d3.add(Field.Text("f1", "hello bharat"));
writer.addDocument(d3);
writer.optimize();
writer.close();
String qString = "";
try
{
BufferedReader in = new BufferedReader(new
InputStreamReader(System.in));
System.out.print("Input for f1: ");
qString = in.readLine();
}
catch(Exception e)
{ System.out.println("Exiting..." + e.getMessage()); return; }
System.out.println("");
Searcher searcher = new IndexSearcher("indexbbs");
Analyzer analyzer = new StandardAnalyzer();
QueryParser qp = new QueryParser("f1", analyzer);
Query query = qp.parse(qString);
System.out.println("QueryInput:" + qString);
System.out.println("QueryCreated:" + query.toString("f1"));
Hits hits = searcher.search(query);
for (int i=0; i<hits.length(); ++i)
System.out.println("Document = f1:" + hits.doc(i).get("f1"));
}
catch(Exception e)
{ System.out.println("Exception:" + e.getMessage());return; }
}
}
Thanks
Bharat
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