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Lucene example source code file (TestSegmentTermDocs.java)

This example Lucene source code file (TestSegmentTermDocs.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

directory, document, document, exception, indexwriter, io, ioexception, ioexception, override, segmentreader, segmenttermdocs, segmenttermdocs, term, term, test_version_current

The Lucene TestSegmentTermDocs.java source code

package org.apache.lucene.index;

/**
 * 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 org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.store.Directory;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;

import java.io.IOException;

public class TestSegmentTermDocs extends LuceneTestCase {
  private Document testDoc = new Document();
  private Directory dir;
  private SegmentInfo info;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    dir = newDirectory();
    DocHelper.setupDoc(testDoc);
    info = DocHelper.writeDoc(random, dir, testDoc);
  }
  
  @Override
  public void tearDown() throws Exception {
    dir.close();
    super.tearDown();
  }

  public void test() {
    assertTrue(dir != null);
  }
  
  public void testTermDocs() throws IOException {
    testTermDocs(1);
  }

  public void testTermDocs(int indexDivisor) throws IOException {
    //After adding the document, we should be able to read it back in
    SegmentReader reader = SegmentReader.get(true, info, indexDivisor);
    assertTrue(reader != null);
    assertEquals(indexDivisor, reader.getTermInfosIndexDivisor());
    SegmentTermDocs segTermDocs = new SegmentTermDocs(reader);
    segTermDocs.seek(new Term(DocHelper.TEXT_FIELD_2_KEY, "field"));
    if (segTermDocs.next() == true)
    {
      int docId = segTermDocs.doc();
      assertTrue(docId == 0);
      int freq = segTermDocs.freq();
      assertTrue(freq == 3);  
    }
    reader.close();
  }  
  
  public void testBadSeek() throws IOException {
    testBadSeek(1);
  }

  public void testBadSeek(int indexDivisor) throws IOException {
    {
      //After adding the document, we should be able to read it back in
      SegmentReader reader = SegmentReader.get(true, info, indexDivisor);
      assertTrue(reader != null);
      SegmentTermDocs segTermDocs = new SegmentTermDocs(reader);
      segTermDocs.seek(new Term("textField2", "bad"));
      assertTrue(segTermDocs.next() == false);
      reader.close();
    }
    {
      //After adding the document, we should be able to read it back in
      SegmentReader reader = SegmentReader.get(true, info, indexDivisor);
      assertTrue(reader != null);
      SegmentTermDocs segTermDocs = new SegmentTermDocs(reader);
      segTermDocs.seek(new Term("junk", "bad"));
      assertTrue(segTermDocs.next() == false);
      reader.close();
    }
  }
  
  public void testSkipTo() throws IOException {
    testSkipTo(1);
  }

  public void testSkipTo(int indexDivisor) throws IOException {
    Directory dir = newDirectory();
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
    
    Term ta = new Term("content","aaa");
    for(int i = 0; i < 10; i++)
      addDoc(writer, "aaa aaa aaa aaa");
      
    Term tb = new Term("content","bbb");
    for(int i = 0; i < 16; i++)
      addDoc(writer, "bbb bbb bbb bbb");
      
    Term tc = new Term("content","ccc");
    for(int i = 0; i < 50; i++)
      addDoc(writer, "ccc ccc ccc ccc");
      
    // assure that we deal with a single segment  
    writer.optimize();
    writer.close();
    
    IndexReader reader = IndexReader.open(dir, null, true, indexDivisor);

    TermDocs tdocs = reader.termDocs();
    
    // without optimization (assumption skipInterval == 16)
    
    // with next
    tdocs.seek(ta);
    assertTrue(tdocs.next());
    assertEquals(0, tdocs.doc());
    assertEquals(4, tdocs.freq());
    assertTrue(tdocs.next());
    assertEquals(1, tdocs.doc());
    assertEquals(4, tdocs.freq());
    assertTrue(tdocs.skipTo(0));
    assertEquals(2, tdocs.doc());
    assertTrue(tdocs.skipTo(4));
    assertEquals(4, tdocs.doc());
    assertTrue(tdocs.skipTo(9));
    assertEquals(9, tdocs.doc());
    assertFalse(tdocs.skipTo(10));
    
    // without next
    tdocs.seek(ta);
    assertTrue(tdocs.skipTo(0));
    assertEquals(0, tdocs.doc());
    assertTrue(tdocs.skipTo(4));
    assertEquals(4, tdocs.doc());
    assertTrue(tdocs.skipTo(9));
    assertEquals(9, tdocs.doc());
    assertFalse(tdocs.skipTo(10));
    
    // exactly skipInterval documents and therefore with optimization
    
    // with next
    tdocs.seek(tb);
    assertTrue(tdocs.next());
    assertEquals(10, tdocs.doc());
    assertEquals(4, tdocs.freq());
    assertTrue(tdocs.next());
    assertEquals(11, tdocs.doc());
    assertEquals(4, tdocs.freq());
    assertTrue(tdocs.skipTo(5));
    assertEquals(12, tdocs.doc());
    assertTrue(tdocs.skipTo(15));
    assertEquals(15, tdocs.doc());
    assertTrue(tdocs.skipTo(24));
    assertEquals(24, tdocs.doc());
    assertTrue(tdocs.skipTo(25));
    assertEquals(25, tdocs.doc());
    assertFalse(tdocs.skipTo(26));
    
    // without next
    tdocs.seek(tb);
    assertTrue(tdocs.skipTo(5));
    assertEquals(10, tdocs.doc());
    assertTrue(tdocs.skipTo(15));
    assertEquals(15, tdocs.doc());
    assertTrue(tdocs.skipTo(24));
    assertEquals(24, tdocs.doc());
    assertTrue(tdocs.skipTo(25));
    assertEquals(25, tdocs.doc());
    assertFalse(tdocs.skipTo(26));
    
    // much more than skipInterval documents and therefore with optimization
    
    // with next
    tdocs.seek(tc);
    assertTrue(tdocs.next());
    assertEquals(26, tdocs.doc());
    assertEquals(4, tdocs.freq());
    assertTrue(tdocs.next());
    assertEquals(27, tdocs.doc());
    assertEquals(4, tdocs.freq());
    assertTrue(tdocs.skipTo(5));
    assertEquals(28, tdocs.doc());
    assertTrue(tdocs.skipTo(40));
    assertEquals(40, tdocs.doc());
    assertTrue(tdocs.skipTo(57));
    assertEquals(57, tdocs.doc());
    assertTrue(tdocs.skipTo(74));
    assertEquals(74, tdocs.doc());
    assertTrue(tdocs.skipTo(75));
    assertEquals(75, tdocs.doc());
    assertFalse(tdocs.skipTo(76));
    
    //without next
    tdocs.seek(tc);
    assertTrue(tdocs.skipTo(5));
    assertEquals(26, tdocs.doc());
    assertTrue(tdocs.skipTo(40));
    assertEquals(40, tdocs.doc());
    assertTrue(tdocs.skipTo(57));
    assertEquals(57, tdocs.doc());
    assertTrue(tdocs.skipTo(74));
    assertEquals(74, tdocs.doc());
    assertTrue(tdocs.skipTo(75));
    assertEquals(75, tdocs.doc());
    assertFalse(tdocs.skipTo(76));
    
    tdocs.close();
    reader.close();
    dir.close();
  }
  
  public void testIndexDivisor() throws IOException {
    testDoc = new Document();
    DocHelper.setupDoc(testDoc);
    DocHelper.writeDoc(random, dir, testDoc);
    testTermDocs(2);
    testBadSeek(2);
    testSkipTo(2);
  }

  private void addDoc(IndexWriter writer, String value) throws IOException
  {
      Document doc = new Document();
      doc.add(newField("content", value, Field.Store.NO, Field.Index.ANALYZED));
      writer.addDocument(doc);
  }
}

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