Lucene example source code file (TestMultiPassIndexSplitter.java)

This example Lucene source code file (TestMultiPassIndexSplitter.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, exception, indexreader, indexwriter, multipassindexsplitter, num_docs, num_docs, override, term, term, termenum

The Lucene TestMultiPassIndexSplitter.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.analysis.MockAnalyzer;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TestMultiPassIndexSplitter extends LuceneTestCase {
  IndexReader input;
  int NUM_DOCS = 11;
  Directory dir;
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    dir = newDirectory();
    IndexWriter w = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
    Document doc;
    for (int i = 0; i < NUM_DOCS; i++) {
      doc = new Document();
      doc.add(newField("id", i + "", Field.Store.YES, Field.Index.NOT_ANALYZED));
      doc.add(newField("f", i + " " + i, Field.Store.YES, Field.Index.ANALYZED));
      w.addDocument(doc);
    }
    w.close();
    input = IndexReader.open(dir, false);
    // delete the last doc
    input.deleteDocument(input.maxDoc() - 1);
    IndexReader inputOld = input;
    input = input.reopen(true);
    inputOld.close();
  }
  
  @Override
  public void tearDown() throws Exception {
    input.close();
    dir.close();
    super.tearDown();
  }
  
  /**
   * Test round-robin splitting.
   */
  public void testSplitRR() throws Exception {
    MultiPassIndexSplitter splitter = new MultiPassIndexSplitter();
    Directory[] dirs = new Directory[]{
            newDirectory(),
            newDirectory(),
            newDirectory()
    };
    splitter.split(input, dirs, false);
    IndexReader ir;
    ir = IndexReader.open(dirs[0], true);
    assertTrue(ir.numDocs() - NUM_DOCS / 3 <= 1); // rounding error
    Document doc = ir.document(0);
    assertEquals("0", doc.get("id"));
    Term t;
    TermEnum te;
    t = new Term("id", "1");
    te = ir.terms(t);
    assertNotSame(t, te.term());
    ir.close();
    ir = IndexReader.open(dirs[1], true);
    assertTrue(ir.numDocs() - NUM_DOCS / 3 <= 1);
    doc = ir.document(0);
    assertEquals("1", doc.get("id"));
    t = new Term("id", "0");
    te = ir.terms(t);
    assertNotSame(t, te.term());
    ir.close();
    ir = IndexReader.open(dirs[2], true);
    assertTrue(ir.numDocs() - NUM_DOCS / 3 <= 1);
    doc = ir.document(0);
    assertEquals("2", doc.get("id"));
    t = new Term("id", "1");
    te = ir.terms(t);
    assertNotSame(t, te.term());
    t = new Term("id", "0");
    te = ir.terms(t);
    assertNotSame(t, te.term());    
    ir.close();
    for (Directory d : dirs)
      d.close();
  }
  
  /**
   * Test sequential splitting.
   */
  public void testSplitSeq() throws Exception {
    MultiPassIndexSplitter splitter = new MultiPassIndexSplitter();
    Directory[] dirs = new Directory[]{
            newDirectory(),
            newDirectory(),
            newDirectory()
    };
    splitter.split(input, dirs, true);
    IndexReader ir;
    ir = IndexReader.open(dirs[0], true);
    assertTrue(ir.numDocs() - NUM_DOCS / 3 <= 1);
    Document doc = ir.document(0);
    assertEquals("0", doc.get("id"));
    int start = ir.numDocs();
    ir.close();
    ir = IndexReader.open(dirs[1], true);
    assertTrue(ir.numDocs() - NUM_DOCS / 3 <= 1);
    doc = ir.document(0);
    assertEquals(start + "", doc.get("id"));
    start += ir.numDocs();
    ir.close();
    ir = IndexReader.open(dirs[2], true);
    assertTrue(ir.numDocs() - NUM_DOCS / 3 <= 1);
    doc = ir.document(0);
    assertEquals(start + "", doc.get("id"));
    // make sure the deleted doc is not here
    Term t;
    TermEnum te;
    t = new Term("id", (NUM_DOCS - 1) + "");
    te = ir.terms(t);
    assertNotSame(t, te.term());    
    ir.close();
    for (Directory d : dirs)
      d.close();
  }
}