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Lucene example source code file (TestIndexWriterMerging.java)

This example Lucene source code file (TestIndexWriterMerging.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, document, index, indexreader, indexwriter, indexwriter, io, ioexception, ioexception, lucenetestcase, mockanalyzer, testindexwritermerging, the, util

The Lucene TestIndexWriterMerging.java source code

package org.apache.lucene.index;
/**
 * Copyright 2006 The Apache Software Foundation
 *
 * Licensed 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.store.Directory;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.util.LuceneTestCase;

import java.io.IOException;
import java.util.Random;


public class TestIndexWriterMerging extends LuceneTestCase
{

  /**
   * Tests that index merging (specifically addIndexes(Directory...)) doesn't
   * change the index order of documents.
   */
  public void testLucene() throws IOException {
    int num=100;

    Directory indexA = newDirectory();
    Directory indexB = newDirectory();

    fillIndex(random, indexA, 0, num);
    boolean fail = verifyIndex(indexA, 0);
    if (fail)
    {
      fail("Index a is invalid");
    }

    fillIndex(random, indexB, num, num);
    fail = verifyIndex(indexB, num);
    if (fail)
    {
      fail("Index b is invalid");
    }

    Directory merged = newDirectory();

    IndexWriter writer = new IndexWriter(
        merged,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
            setMergePolicy(newLogMergePolicy(2))
    );
    writer.setInfoStream(VERBOSE ? System.out : null);
    writer.addIndexes(new Directory[]{indexA, indexB});
    writer.optimize();
    writer.close();

    fail = verifyIndex(merged, 0);

    assertFalse("The merged index is invalid", fail);
    indexA.close();
    indexB.close();
    merged.close();
  }

  private boolean verifyIndex(Directory directory, int startAt) throws IOException
  {
    boolean fail = false;
    IndexReader reader = IndexReader.open(directory, true);

    int max = reader.maxDoc();
    for (int i = 0; i < max; i++)
    {
      Document temp = reader.document(i);
      //System.out.println("doc "+i+"="+temp.getField("count").stringValue());
      //compare the index doc number to the value that it should be
      if (!temp.getField("count").stringValue().equals((i + startAt) + ""))
      {
        fail = true;
        System.out.println("Document " + (i + startAt) + " is returning document " + temp.getField("count").stringValue());
      }
    }
    reader.close();
    return fail;
  }

  private void fillIndex(Random random, Directory dir, int start, int numDocs) throws IOException {

    IndexWriter writer = new IndexWriter(
        dir,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
            setOpenMode(OpenMode.CREATE).
            setMaxBufferedDocs(2).
            setMergePolicy(newLogMergePolicy(2))
    );

    for (int i = start; i < (start + numDocs); i++)
    {
      Document temp = new Document();
      temp.add(newField("count", (""+i), Field.Store.YES, Field.Index.NOT_ANALYZED));

      writer.addDocument(temp);
    }
    writer.close();
  }
}

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