package hello;

import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;

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

import org.apache.lucene.document.Document;

import org.apache.lucene.document.Field;

import org.apache.lucene.document.TextField;

import org.apache.lucene.index.DirectoryReader;

import org.apache.lucene.index.IndexWriter;

import org.apache.lucene.index.IndexWriterConfig;

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.ScoreDoc;

import org.apache.lucene.store.Directory;

import org.apache.lucene.store.RAMDirectory;

public class Lucene5_5_5_demo {

    public static void main(String[] args) throws IOException, ParseException {

        Analyzer analyzer = new StandardAnalyzer();

        // Store the index in memory:

        Directory directory = new RAMDirectory();

        // To store an index on disk, use this instead:

        //Directory directory = FSDirectory.open("/tmp/testindex");

        IndexWriterConfig config = new IndexWriterConfig(analyzer);

        IndexWriter iwriter = new IndexWriter(directory, config);

        Document doc = new Document();

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

        doc.add(new Field("fieldname", text, TextField.TYPE_STORED));

        iwriter.addDocument(doc);

        iwriter.close();

        // Now search the index:

        DirectoryReader ireader = DirectoryReader.open(directory);

        IndexSearcher isearcher = new IndexSearcher(ireader);

        // Parse a simple query that searches for "text":

        QueryParser parser = new QueryParser("fieldname", analyzer);

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

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

        assert(1 == hits.length);

        // Iterate through the results:

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

          Document hitDoc = isearcher.doc(hits[i].doc);

          System.out.println(hitDoc.get("fieldname"));

        }

        ireader.close();

        directory.close();

    }

}