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Lucene example source code file (TestMultiSearcherRanking.java)

This example Lucene source code file (TestMultiSearcherRanking.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

document, document, exception, field_name, indexsearcher, indexwriter, indexwriter, io, ioexception, ioexception, override, parseexception, parseexception, searchable, searcher

The Lucene TestMultiSearcherRanking.java source code

package org.apache.lucene.search;

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *     http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

import org.apache.lucene.util.LuceneTestCase;
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.store.Directory;
import java.io.IOException;

 * Tests {@link MultiSearcher} ranking, i.e. makes sure this bug is fixed:
 * http://issues.apache.org/bugzilla/show_bug.cgi?id=31841
public class TestMultiSearcherRanking extends LuceneTestCase {
  private final String FIELD_NAME = "body";
  private Searcher multiSearcher;
  private Searcher singleSearcher;

  public void testOneTermQuery() throws IOException, ParseException {

  public void testTwoTermQuery() throws IOException, ParseException {
    checkQuery("three foo");

  public void testPrefixQuery() throws IOException, ParseException {

  public void testFuzzyQuery() throws IOException, ParseException {

  public void testRangeQuery() throws IOException, ParseException {
    checkQuery("{multiA TO multiP}");

  public void testMultiPhraseQuery() throws IOException, ParseException {
      checkQuery("\"blueberry pi*\"");

  public void testNoMatchQuery() throws IOException, ParseException {
    checkQuery("+three +nomatch");

  public void testTermRepeatedQuery() throws IOException, ParseException {
    // TODO: this corner case yields different results.
    checkQuery("multi* multi* foo");

   * checks if a query yields the same result when executed on
   * a single IndexSearcher containing all documents and on a
   * MultiSearcher aggregating sub-searchers
   * @param queryStr  the query to check.
   * @throws IOException
   * @throws ParseException
  private void checkQuery(String queryStr) throws IOException, ParseException {
    // check result hit ranking
    if(VERBOSE) System.out.println("Query: " + queryStr);
      QueryParser queryParser = new QueryParser(TEST_VERSION_CURRENT, FIELD_NAME, new StandardAnalyzer(TEST_VERSION_CURRENT));
    Query query = queryParser.parse(queryStr);
    ScoreDoc[] multiSearcherHits = multiSearcher.search(query, null, 1000).scoreDocs;
    ScoreDoc[] singleSearcherHits = singleSearcher.search(query, null, 1000).scoreDocs;
    assertEquals(multiSearcherHits.length, singleSearcherHits.length);
    for (int i = 0; i < multiSearcherHits.length; i++) {
      Document docMulti = multiSearcher.doc(multiSearcherHits[i].doc);
      Document docSingle = singleSearcher.doc(singleSearcherHits[i].doc);
      if(VERBOSE) System.out.println("Multi:  " + docMulti.get(FIELD_NAME) + " score="
          + multiSearcherHits[i].score);
      if(VERBOSE) System.out.println("Single: " + docSingle.get(FIELD_NAME) + " score="
          + singleSearcherHits[i].score);
      assertEquals(multiSearcherHits[i].score, singleSearcherHits[i].score,
      assertEquals(docMulti.get(FIELD_NAME), docSingle.get(FIELD_NAME));
    if(VERBOSE) System.out.println();
   * initializes multiSearcher and singleSearcher with the same document set
  public void setUp() throws Exception {
    // create MultiSearcher from two seperate searchers
    d1 = newDirectory();
    IndexWriter iw1 = new IndexWriter(d1, newIndexWriterConfig(TEST_VERSION_CURRENT, new StandardAnalyzer(TEST_VERSION_CURRENT)).setMergePolicy(newLogMergePolicy()));
    d2 = newDirectory();
    IndexWriter iw2 = new IndexWriter(d2, newIndexWriterConfig(TEST_VERSION_CURRENT, new StandardAnalyzer(TEST_VERSION_CURRENT)).setMergePolicy(newLogMergePolicy()));

    Searchable[] s = new Searchable[2];
    s[0] = new IndexSearcher(d1, true);
    s[1] = new IndexSearcher(d2, true);
    multiSearcher = new MultiSearcher(s);

    // create IndexSearcher which contains all documents
    d = newDirectory();
    IndexWriter iw = new IndexWriter(d, newIndexWriterConfig(TEST_VERSION_CURRENT, new StandardAnalyzer(TEST_VERSION_CURRENT)).setMergePolicy(newLogMergePolicy()));
    singleSearcher = new IndexSearcher(d, true);
  Directory d1, d2, d;
  public void tearDown() throws Exception {
  private void addCollection1(IndexWriter iw) throws IOException {
    add("one blah three", iw);
    add("one foo three multiOne", iw);
    add("one foobar three multiThree", iw);
    add("blueberry pie", iw);
    add("blueberry strudel", iw);
    add("blueberry pizza", iw);

  private void addCollection2(IndexWriter iw) throws IOException {
    add("two blah three", iw);
    add("two foo xxx multiTwo", iw);
    add("two foobar xxx multiThreee", iw);
    add("blueberry chewing gum", iw);
    add("bluebird pizza", iw);
    add("bluebird foobar pizza", iw);
    add("piccadilly circus", iw);
  private void add(String value, IndexWriter iw) throws IOException {
    Document d = new Document();
    d.add(newField(FIELD_NAME, value, Field.Store.YES, Field.Index.ANALYZED));

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