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Lucene example source code file (TestParallelReaderEmptyIndex.java)

This example Lucene source code file (TestParallelReaderEmptyIndex.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, directory, document, indexreader, indexwriter, indexwriter, io, ioexception, lucenetestcase, mockanalyzer, mockanalyzer, parallelreader, test_version_current, test_version_current, testparallelreaderemptyindex

The Lucene TestParallelReaderEmptyIndex.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 java.io.IOException;

import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Index;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.Field.TermVector;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;

/**
 * Some tests for {@link ParallelReader}s with empty indexes
 * 
 * @author Christian Kohlschuetter
 */
public class TestParallelReaderEmptyIndex extends LuceneTestCase {

  /**
   * Creates two empty indexes and wraps a ParallelReader around. Adding this
   * reader to a new index should not throw any exception.
   * 
   * @throws IOException
   */
  public void testEmptyIndex() throws IOException {
    Directory rd1 = newDirectory();
    IndexWriter iw = new IndexWriter(rd1, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    iw.close();

    Directory rd2 = newDirectory(rd1);

    Directory rdOut = newDirectory();

    IndexWriter iwOut = new IndexWriter(rdOut, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(rd1,true));
    pr.add(IndexReader.open(rd2,true));
		
    // When unpatched, Lucene crashes here with a NoSuchElementException (caused by ParallelTermEnum)
    iwOut.addIndexes(new IndexReader[] { pr });
		
    iwOut.optimize();
    iwOut.close();
    _TestUtil.checkIndex(rdOut);
    rdOut.close();
    rd1.close();
    rd2.close();
  }

  /**
   * This method creates an empty index (numFields=0, numDocs=0) but is marked
   * to have TermVectors. Adding this index to another index should not throw
   * any exception.
   */
  public void testEmptyIndexWithVectors() throws IOException {
    Directory rd1 = newDirectory();
    {
      IndexWriter iw = new IndexWriter(rd1, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
      Document doc = new Document();
      doc.add(newField("test", "", Store.NO, Index.ANALYZED,
                        TermVector.YES));
      iw.addDocument(doc);
      doc.add(newField("test", "", Store.NO, Index.ANALYZED,
                        TermVector.NO));
      iw.addDocument(doc);
      iw.close();

      IndexReader ir = IndexReader.open(rd1,false);
      ir.deleteDocument(0);
      ir.close();

      iw = new IndexWriter(rd1, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)).setOpenMode(OpenMode.APPEND));
      iw.optimize();
      iw.close();
    }

    Directory rd2 = newDirectory();
    {
      IndexWriter iw = new IndexWriter(rd2, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
      Document doc = new Document();
      iw.addDocument(doc);
      iw.close();
    }

    Directory rdOut = newDirectory();

    IndexWriter iwOut = new IndexWriter(rdOut, newIndexWriterConfig( TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    ParallelReader pr = new ParallelReader();
    pr.add(IndexReader.open(rd1,true));
    pr.add(IndexReader.open(rd2,true));

    // When unpatched, Lucene crashes here with an ArrayIndexOutOfBoundsException (caused by TermVectorsWriter)
    iwOut.addIndexes(new IndexReader[] { pr });

    // ParallelReader closes any IndexReader you added to it:
    pr.close();

    rd1.close();
    rd2.close();
		
    iwOut.optimize();
    iwOut.close();
    
    _TestUtil.checkIndex(rdOut);
    rdOut.close();
  }
}

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