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Lucene example source code file (TestDoc.java)

This example Lucene source code file (TestDoc.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, exception, file, file, indexwriter, io, mockanalyzer, printwriter, printwriter, segmentinfo, segmentinfo, segmentreader, string, string, stringwriter, util

The Lucene TestDoc.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.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;

import java.util.LinkedList;
import java.util.Collection;

import junit.framework.TestSuite;
import junit.textui.TestRunner;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;

/** JUnit adaptation of an older test case DocTest. */
public class TestDoc extends LuceneTestCase {

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

    private File workDir;
    private File indexDir;
    private LinkedList<File> files;

    /** Set the test case. This test case needs
     *  a few text files created in the current working directory.
     */
    @Override
    public void setUp() throws Exception {
        super.setUp();
        workDir = _TestUtil.getTempDir("TestDoc");
        workDir.mkdirs();

        indexDir = _TestUtil.getTempDir("testIndex");
        indexDir.mkdirs();

        Directory directory = newFSDirectory(indexDir);
        directory.close();

        files = new LinkedList<File>();
        files.add(createOutput("test.txt",
            "This is the first test file"
        ));

        files.add(createOutput("test2.txt",
            "This is the second test file"
        ));
    }

    private File createOutput(String name, String text) throws IOException {
        FileWriter fw = null;
        PrintWriter pw = null;

        try {
            File f = new File(workDir, name);
            if (f.exists()) f.delete();

            fw = new FileWriter(f);
            pw = new PrintWriter(fw);
            pw.println(text);
            return f;

        } finally {
            if (pw != null) pw.close();
            if (fw != null) fw.close();
        }
    }


    /** This test executes a number of merges and compares the contents of
     *  the segments created when using compound file or not using one.
     *
     *  TODO: the original test used to print the segment contents to System.out
     *        for visual validation. To have the same effect, a new method
     *        checkSegment(String name, ...) should be created that would
     *        assert various things about the segment.
     */
    public void testIndexAndMerge() throws Exception {
      StringWriter sw = new StringWriter();
      PrintWriter out = new PrintWriter(sw, true);
      
      Directory directory = newFSDirectory(indexDir);
      IndexWriter writer = new IndexWriter(
          directory,
          newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
              setOpenMode(OpenMode.CREATE).
              setMaxBufferedDocs(-1).
              setMergePolicy(newLogMergePolicy(10))
      );

      SegmentInfo si1 = indexDoc(writer, "test.txt");
      printSegment(out, si1);

      SegmentInfo si2 = indexDoc(writer, "test2.txt");
      printSegment(out, si2);
      writer.close();

      SegmentInfo siMerge = merge(si1, si2, "merge", false);
      printSegment(out, siMerge);

      SegmentInfo siMerge2 = merge(si1, si2, "merge2", false);
      printSegment(out, siMerge2);

      SegmentInfo siMerge3 = merge(siMerge, siMerge2, "merge3", false);
      printSegment(out, siMerge3);
      
      directory.close();
      out.close();
      sw.close();
      String multiFileOutput = sw.getBuffer().toString();
      //System.out.println(multiFileOutput);

      sw = new StringWriter();
      out = new PrintWriter(sw, true);

      directory = newFSDirectory(indexDir);
      writer = new IndexWriter(
          directory,
          newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).
              setOpenMode(OpenMode.CREATE).
              setMaxBufferedDocs(-1).
              setMergePolicy(newLogMergePolicy(10))
      );

      si1 = indexDoc(writer, "test.txt");
      printSegment(out, si1);

      si2 = indexDoc(writer, "test2.txt");
      printSegment(out, si2);
      writer.close();

      siMerge = merge(si1, si2, "merge", true);
      printSegment(out, siMerge);

      siMerge2 = merge(si1, si2, "merge2", true);
      printSegment(out, siMerge2);

      siMerge3 = merge(siMerge, siMerge2, "merge3", true);
      printSegment(out, siMerge3);
      
      directory.close();
      out.close();
      sw.close();
      String singleFileOutput = sw.getBuffer().toString();

      assertEquals(multiFileOutput, singleFileOutput);
   }

   private SegmentInfo indexDoc(IndexWriter writer, String fileName)
   throws Exception
   {
      File file = new File(workDir, fileName);
      Document doc = new Document();
      doc.add(new Field("contents", new FileReader(file)));
      writer.addDocument(doc);
      writer.commit();
      return writer.newestSegment();
   }


   private SegmentInfo merge(SegmentInfo si1, SegmentInfo si2, String merged, boolean useCompoundFile)
   throws Exception {
      SegmentReader r1 = SegmentReader.get(true, si1, IndexReader.DEFAULT_TERMS_INDEX_DIVISOR);
      SegmentReader r2 = SegmentReader.get(true, si2, IndexReader.DEFAULT_TERMS_INDEX_DIVISOR);

      SegmentMerger merger = new SegmentMerger(si1.dir, IndexWriterConfig.DEFAULT_TERM_INDEX_INTERVAL, merged, null, null, new FieldInfos());

      merger.add(r1);
      merger.add(r2);
      merger.merge();
      r1.close();
      r2.close();
      
      final SegmentInfo info = new SegmentInfo(merged, si1.docCount + si2.docCount, si1.dir,
                                               false, true,
                                               merger.fieldInfos().hasProx(),
                                               merger.fieldInfos().hasVectors());
      
      if (useCompoundFile) {
        Collection<String> filesToDelete = merger.createCompoundFile(merged + ".cfs", info);
        info.setUseCompoundFile(true);
        for (final String fileToDelete : filesToDelete) 
          si1.dir.deleteFile(fileToDelete);
      }

      return info;
   }


   private void printSegment(PrintWriter out, SegmentInfo si)
   throws Exception {
      SegmentReader reader = SegmentReader.get(true, si, IndexReader.DEFAULT_TERMS_INDEX_DIVISOR);

      for (int i = 0; i < reader.numDocs(); i++)
        out.println(reader.document(i));

      TermEnum tis = reader.terms();
      while (tis.next()) {
        out.print(tis.term());
        out.println(" DF=" + tis.docFreq());

        TermPositions positions = reader.termPositions(tis.term());
        try {
          while (positions.next()) {
            out.print(" doc=" + positions.doc());
            out.print(" TF=" + positions.freq());
            out.print(" pos=");
            out.print(positions.nextPosition());
            for (int j = 1; j < positions.freq(); j++)
              out.print("," + positions.nextPosition());
            out.println("");
          }
        } finally {
          positions.close();
        }
      }
      tis.close();
      reader.close();
    }
}

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