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Lucene example source code file (TestDateSort.java)

This example Lucene source code file (TestDateSort.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, exception, field, mockanalyzer, mockanalyzer, override, queryparser, randomindexwriter, sort, string, string, text_field, util

The Lucene TestDateSort.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,
 * 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.Arrays;

import org.apache.lucene.util.LuceneTestCase;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.DateTools;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.store.Directory;

/**
 * Test date sorting, i.e. auto-sorting of fields with type "long".
 * See http://issues.apache.org/jira/browse/LUCENE-1045 
 */
public class TestDateSort extends LuceneTestCase {

  private static final String TEXT_FIELD = "text";
  private static final String DATE_TIME_FIELD = "dateTime";

  private Directory directory;
  private IndexReader reader;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    // Create an index writer.
    directory = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random, directory, new MockAnalyzer(random));

    // oldest doc:
    // Add the first document.  text = "Document 1"  dateTime = Oct 10 03:25:22 EDT 2007
    writer.addDocument(createDocument("Document 1", 1192001122000L));
    // Add the second document.  text = "Document 2"  dateTime = Oct 10 03:25:26 EDT 2007 
    writer.addDocument(createDocument("Document 2", 1192001126000L));
    // Add the third document.  text = "Document 3"  dateTime = Oct 11 07:12:13 EDT 2007 
    writer.addDocument(createDocument("Document 3", 1192101133000L));
    // Add the fourth document.  text = "Document 4"  dateTime = Oct 11 08:02:09 EDT 2007
    writer.addDocument(createDocument("Document 4", 1192104129000L));
    // latest doc:
    // Add the fifth document.  text = "Document 5"  dateTime = Oct 12 13:25:43 EDT 2007
    writer.addDocument(createDocument("Document 5", 1192209943000L));

    reader = writer.getReader();
    writer.close();
  }

  @Override
  public void tearDown() throws Exception {
    reader.close();
    directory.close();
    super.tearDown();
  }

  public void testReverseDateSort() throws Exception {
    IndexSearcher searcher = newSearcher(reader);

    Sort sort = new Sort(new SortField(DATE_TIME_FIELD, SortField.STRING, true));

    QueryParser queryParser = new QueryParser(TEST_VERSION_CURRENT, TEXT_FIELD, new MockAnalyzer(random));
    Query query = queryParser.parse("Document");

    // Execute the search and process the search results.
    String[] actualOrder = new String[5];
    ScoreDoc[] hits = searcher.search(query, null, 1000, sort).scoreDocs;
    for (int i = 0; i < hits.length; i++) {
      Document document = searcher.doc(hits[i].doc);
      String text = document.get(TEXT_FIELD);
      actualOrder[i] = text;
    }
    searcher.close();

    // Set up the expected order (i.e. Document 5, 4, 3, 2, 1).
    String[] expectedOrder = new String[5];
    expectedOrder[0] = "Document 5";
    expectedOrder[1] = "Document 4";
    expectedOrder[2] = "Document 3";
    expectedOrder[3] = "Document 2";
    expectedOrder[4] = "Document 1";

    assertEquals(Arrays.asList(expectedOrder), Arrays.asList(actualOrder));
  }

  private Document createDocument(String text, long time) {
    Document document = new Document();

    // Add the text field.
    Field textField = newField(TEXT_FIELD, text, Field.Store.YES, Field.Index.ANALYZED);
    document.add(textField);

    // Add the date/time field.
    String dateTimeString = DateTools.timeToString(time, DateTools.Resolution.SECOND);
    Field dateTimeField = newField(DATE_TIME_FIELD, dateTimeString, Field.Store.YES,
        Field.Index.NOT_ANALYZED);
    document.add(dateTimeField);

    return document;
  }

}

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