Lucene Fuzzy Query Edit Distance

gistfile1.java

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

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.en.EnglishAnalyzer;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryparser.analyzing.AnalyzingQueryParser;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;

public class LuceneSearchTest {

	public static void main(String[] args) throws IOException, ParseException {
		// English Analyzer
		Analyzer analyzer = new EnglishAnalyzer(Version.LUCENE_48);
		
		// In memory index
		final Directory directory = new RAMDirectory();
		final IndexWriterConfig config = new IndexWriterConfig(
				Version.LUCENE_48, analyzer);
		final IndexWriter writer = new IndexWriter(directory, config);

		// Document with analyzed field (TextField)
		final Document document1 = new Document();
		document1.add(new TextField("representation", "SALICYLIC", Store.YES));

		// Add Document
		writer.addDocument(document1);
		writer.commit();
		writer.close();

		// 
		final IndexReader indexReader = DirectoryReader.open(directory);
		final QueryParser qp = new AnalyzingQueryParser(Version.LUCENE_48,
				"representation", analyzer);
		final Query query = qp.parse("salisyic~");
		System.out.println("Query type: " + query.getClass().getSimpleName());
		System.out.println("Parsed query: " + query);

		final IndexSearcher searcher = new IndexSearcher(indexReader);
		final TopDocs docs = searcher.search(query, 100);
		System.out.println("Found " + docs.scoreDocs.length + " results");

		System.out.println("---");
		tokenize(analyzer, "SALICYLIC");
		System.out.println("---");
		tokenize(analyzer, "SALISYIC");
	}

	private static void tokenize(Analyzer analyzer, String term) throws IOException,
			ParseException {
		System.out.println("Analyzer: " + analyzer.getClass());
		System.out.println("Term: " + term);
		TokenStream stream = analyzer.tokenStream("representation",
				new StringReader(term));
		CharTermAttribute cattr = stream.addAttribute(CharTermAttribute.class);
		stream.reset();
		while (stream.incrementToken()) {
			System.out.println(cattr.toString());
		}
		stream.end();
		stream.close();
	}
}