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Lucene example source code file (TestSearch.java)

This example Lucene source code file (TestSearch.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, gregoriancalendar, indexwriter, io, logmergepolicy, printwriter, printwriter, queryparser, sortfield, string, string, stringwriter, stringwriter, util

The Lucene TestSearch.java source code

package org.apache.lucene;

/**
 * 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.GregorianCalendar;
import java.util.Random;
import java.io.PrintWriter;
import java.io.StringWriter;

import org.apache.lucene.util.LuceneTestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;

import org.apache.lucene.store.*;
import org.apache.lucene.document.*;
import org.apache.lucene.analysis.*;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;
import org.apache.lucene.queryParser.*;

/** JUnit adaptation of an older test case SearchTest. */
public class TestSearch extends LuceneTestCase {

    /** Main for running test case by itself. */
    public static void main(String args[]) {
        TestRunner.run (new TestSuite(TestSearch.class));
    }

    /** This test performs a number of searches. It also compares output
     *  of searches using multi-file index segments with single-file
     *  index segments.
     *
     *  TODO: someone should check that the results of the searches are
     *        still correct by adding assert statements. Right now, the test
     *        passes if the results are the same between multi-file and
     *        single-file formats, even if the results are wrong.
     */
    public void testSearch() throws Exception {
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw, true);
      doTestSearch(random, pw, false);
      pw.close();
      sw.close();
      String multiFileOutput = sw.getBuffer().toString();
      //System.out.println(multiFileOutput);

      sw = new StringWriter();
      pw = new PrintWriter(sw, true);
      doTestSearch(random, pw, true);
      pw.close();
      sw.close();
      String singleFileOutput = sw.getBuffer().toString();

      assertEquals(multiFileOutput, singleFileOutput);
    }


    private void doTestSearch(Random random, PrintWriter out, boolean useCompoundFile)
    throws Exception {
      Directory directory = newDirectory();
      Analyzer analyzer = new MockAnalyzer(random);
      IndexWriterConfig conf = newIndexWriterConfig(TEST_VERSION_CURRENT, analyzer);
      MergePolicy mp = conf.getMergePolicy();
      if (mp instanceof LogMergePolicy) {
        ((LogMergePolicy) mp).setUseCompoundFile(useCompoundFile);
      }
      
      IndexWriter writer = new IndexWriter(directory, conf);

      String[] docs = {
        "a b c d e",
        "a b c d e a b c d e",
        "a b c d e f g h i j",
        "a c e",
        "e c a",
        "a c e a c e",
        "a c e a b c"
      };
      for (int j = 0; j < docs.length; j++) {
        Document d = new Document();
        d.add(newField("contents", docs[j], Field.Store.YES, Field.Index.ANALYZED));
        d.add(newField("id", ""+j, Field.Index.NOT_ANALYZED_NO_NORMS));
        writer.addDocument(d);
      }
      writer.close();

      Searcher searcher = new IndexSearcher(directory, true);

      String[] queries = {
        "a b",
        "\"a b\"",
        "\"a b c\"",
        "a c",
        "\"a c\"",
        "\"a c e\"",
      };
      ScoreDoc[] hits = null;

      Sort sort = new Sort(new SortField[] {
          SortField.FIELD_SCORE,
          new SortField("id", SortField.INT)});

      QueryParser parser = new QueryParser(TEST_VERSION_CURRENT, "contents", analyzer);
      parser.setPhraseSlop(4);
      for (int j = 0; j < queries.length; j++) {
        Query query = parser.parse(queries[j]);
        out.println("Query: " + query.toString("contents"));

        hits = searcher.search(query, null, 1000, sort).scoreDocs;

        out.println(hits.length + " total results");
        for (int i = 0 ; i < hits.length && i < 10; i++) {
          Document d = searcher.doc(hits[i].doc);
          out.println(i + " " + hits[i].score
// 			   + " " + DateField.stringToDate(d.get("modified"))
                             + " " + d.get("contents"));
        }
      }
      searcher.close();
      directory.close();
  }

  static long Time(int year, int month, int day) {
    GregorianCalendar calendar = new GregorianCalendar();
    calendar.clear();
    calendar.set(year, month, day);
    return calendar.getTime().getTime();
  }
}

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