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From manjula wijewickrema <manjul...@gmail.com>
Subject Error of the code
Date Thu, 13 May 2010 10:07:21 GMT
Dear All,

I am trying to get the term frequencies (through TermFreqVector) of a
document (using Lucene 2.9.1). In order to do that I have used the following
code. But there is a compile time error in the code and I can't figure it
out. Could somebody can guide me what's wrong with it.
Compile time error I got:
Cannot make a static reference to the non-static method
getTermFreqVector(int, String) from the type IndexReader.

Code:

 *import* org.apache.lucene.analysis.standard.StandardAnalyzer;

*import* org.apache.lucene.document.Document;
*

import* org.apache.lucene.document.Field;
*

import* org.apache.lucene.index.IndexWriter;
*

import* org.apache.lucene.queryParser.ParseException;
*

import* org.apache.lucene.queryParser.QueryParser;
*

import* org.apache.lucene.search.*;
*

import* org.apache.lucene.store.Directory;
*

import* org.apache.lucene.store.RAMDirectory;
*

import* org.apache.lucene.util.Version;

*

import* org.apache.lucene.index.IndexReader;
*

import* org.apache.lucene.index.TermEnum;
*

import* org.apache.lucene.index.Term;
*

import* org.apache.lucene.index.TermFreqVector;

*

import* java.io.IOException;
*

public* *class* DemoTest {

*public* *static* *void* main(String[] args) {

StandardAnalyzer analyzer = *new* StandardAnalyzer(Version.*LUCENE_CURRENT*
);

*try* {

Directory directory = *new* RAMDirectory();

IndexWriter iwriter = *new* IndexWriter(directory, analyzer,
*true*,*new*IndexWriter.MaxFieldLength(25000));

Document doc = *new* Document();

String text = "This is the text to be indexed.";

doc.add(*new* Field("fieldname", text, Field.Store.*YES*,Field.Index.*
ANALYZED*,Field.TermVector.*WITH_POSITIONS_OFFSETS*));

iwriter.addDocument(doc);

TermFreqVector vector = IndexReader.getTermFreqVector(0, "fieldname" );
*

int* size = vector.size();

*for* ( String term : vector.getTerms() )

System.*out*.println( "size = " + size );

iwriter.close();

IndexSearcher isearcher = *new* IndexSearcher(directory, *true*);

QueryParser parser = *new* QueryParser(Version.*LUCENE_CURRENT*, "fieldname",
analyzer);

Query query = parser.parse("text");

ScoreDoc[] hits = isearcher.search(query, *null*, 1000).scoreDocs;

System.*out*.println("hits.length(1) = " + hits.length);

// Iterate through the results:

*for* (*int* i = 0; i < hits.length; i++) {

Document hitDoc = isearcher.doc(hits.doc);

System.*out*.println("hitDoc.get(\"fieldname\") (This is the text to be
indexed) = " +

hitDoc.get("fieldname"));

}

isearcher.close();

directory.close();

} *catch* (Exception ex) {

ex.printStackTrace();

}

}

}



Thanks in advance

Manjula

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