Query Expansion lucene - lucene

Question

I am new to lucene and I am trying to do query expansion.
I have referred to these two posts (first , second) and I've managed to reuse the code in a way that suits version 6.0.0, as the one in the previous is deprecated.
The issue is, either I'm not getting a results or I didn't access the results (expanded queries) appropriately.
Here is my code:
import com.sun.corba.se.impl.util.Version;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.text.ParseException;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.standard.ClassicTokenizer;
import org.apache.lucene.analysis.standard.StandardFilter;
import org.apache.lucene.analysis.synonym.SynonymFilter;
import org.apache.lucene.analysis.synonym.SynonymMap;
import org.apache.lucene.analysis.synonym.WordnetSynonymParser;
import org.apache.lucene.analysis.util.CharArraySet;
import org.apache.lucene.util.*;
public class Graph extends Analyzer
{
protected static TokenStreamComponents createComponents(String fieldName, Reader reader) throws ParseException{
System.out.println("1");
// TODO Auto-generated method stub
Tokenizer source = new ClassicTokenizer();
source.setReader(reader);
TokenStream filter = new StandardFilter( source);
filter = new LowerCaseFilter(filter);
SynonymMap mySynonymMap = null;
try {
mySynonymMap = buildSynonym();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
filter = new SynonymFilter(filter, mySynonymMap, false);
return new TokenStreamComponents(source, filter);
}
private static SynonymMap buildSynonym() throws IOException, ParseException
{ System.out.print("build");
File file = new File("wn\\wn_s.pl");
InputStream stream = new FileInputStream(file);
Reader rulesReader = new InputStreamReader(stream);
SynonymMap.Builder parser = null;
parser = new WordnetSynonymParser(true, true, new StandardAnalyzer(CharArraySet.EMPTY_SET));
System.out.print(parser.toString());
((WordnetSynonymParser) parser).parse(rulesReader);
SynonymMap synonymMap = parser.build();
return synonymMap;
}
public static void main (String[] args) throws UnsupportedEncodingException, IOException, ParseException
{
Reader reader = new FileReader("C:\\input.txt"); // here I have the queries that I want to expand
TokenStreamComponents TSC = createComponents( "" , new StringReader("some text goes here"));
**System.out.print(TSC); //How to get the result from TSC????**
}
#Override
protected TokenStreamComponents createComponents(String string)
{
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
Please suggest ways to help me access the expanded queries!

Answer 1

So, are you just trying to figure out how to iterate through the terms from the TokenStreamComponents in your main method?
Something like this:
TokenStreamComponents TSC = createComponents( "" , new StringReader("some text goes here"));
TokenStream stream = TSC.getTokenStream();
CharTermAttribute termattr = stream.addAttribute(CharTermAttribute.class);
stream.reset();
while (stream.incrementToken()) {
System.out.println(termattr.toString());
}