import org.apache.lucene.analysis.standard.ClassicAnalyzer;
import org.apache.lucene.document.*;
import org.apache.lucene.index.*;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.*;
import org.apache.lucene.search.similarities.DefaultSimilarity;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;

import java.io.IOException;
import java.io.StringReader;

public class Test {

    static class MySim extends DefaultSimilarity {

        @Override
        public float tf(float freq) {
            return freq;
        }

    }

    public static void main(String[] args) throws IOException, ParseException {
        RAMDirectory idx = new RAMDirectory();
        ClassicAnalyzer analyzer = new ClassicAnalyzer(Version.LUCENE_40, new StringReader(""));
        MySim similarity = new MySim();

        IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_40, analyzer);
        indexWriterConfig.setSimilarity(similarity);
        IndexWriter writer = new IndexWriter(
                idx,
                indexWriterConfig
        );
        Document d1 = new Document();
        d1.add(new StringField("id", "1", Field.Store.YES));
        d1.add(new Field("field", "one two", Field.Store.YES, Field.Index.ANALYZED));
        writer.addDocument(d1);

        Document d2 = new Document();
        d2.add(new StringField("id", "2", Field.Store.YES));
        d2.add(new Field("field", "one three", Field.Store.YES, Field.Index.ANALYZED));
        writer.addDocument(d2);

        Document d3 = new Document();
        d3.add(new StringField("id", "3", Field.Store.YES));
        d3.add(new Field("field", "one blah blah blah one", Field.Store.YES, Field.Index.ANALYZED));
        writer.addDocument(d3);

        writer.commit();

        IndexReader reader = DirectoryReader.open(idx);
        IndexSearcher searcher = new IndexSearcher(reader);
        searcher.setSimilarity(similarity);

        Query q1 = new QueryParser(Version.LUCENE_40, "field", analyzer).parse("field:one");
        TopDocs td1 = searcher.search(q1, 3);
        System.out.println(td1.totalHits);
        for (ScoreDoc scoreDoc : td1.scoreDocs) {
            Document document = reader.document(scoreDoc.doc);
            System.out.println(searcher.explain(q1, scoreDoc.doc));
            System.out.println(document.get("id"));
        }
    }
}