Lucene example source code file (TestPKIndexSplitter.java)

This example Lucene source code file (TestPKIndexSplitter.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, mockanalyzer, pkindexsplitter, string, string, stringbuilder, term, term, text

The Lucene TestPKIndexSplitter.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.text.DecimalFormat;
import java.text.NumberFormat;

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

public class TestPKIndexSplitter extends LuceneTestCase {

  public void testSplit() throws Exception {    
    NumberFormat format = new DecimalFormat("000000000");
    Directory dir = newDirectory();
    IndexWriter w = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random, MockTokenizer.WHITESPACE, false))
        .setOpenMode(OpenMode.CREATE));
    for (int x = 0; x < 11; x++) {
      Document doc = createDocument(x, "1", 3, format);
      w.addDocument(doc);
    }
    for (int x = 11; x < 20; x++) {
      Document doc = createDocument(x, "2", 3, format);
      w.addDocument(doc);
    }
    w.close();
    
    final Term midTerm = new Term("id", format.format(11));
    
    checkSplitting(dir, midTerm, 11, 9);
    
    // delete some documents
    w = new IndexWriter(dir, newIndexWriterConfig(
        TEST_VERSION_CURRENT, new MockAnalyzer(random, MockTokenizer.WHITESPACE, false))
        .setOpenMode(OpenMode.APPEND));
    w.deleteDocuments(midTerm);
    w.deleteDocuments(new Term("id", format.format(2)));
    w.close();
    
    checkSplitting(dir, midTerm, 10, 8);
    
    dir.close();
  }
  
  private void checkSplitting(Directory dir, Term splitTerm, int leftCount, int rightCount) throws Exception {
    Directory dir1 = newDirectory();
    Directory dir2 = newDirectory();
    PKIndexSplitter splitter = new PKIndexSplitter(dir, dir1, dir2, splitTerm);
    splitter.split();
    
    IndexReader ir1 = IndexReader.open(dir1);
    IndexReader ir2 = IndexReader.open(dir2);
    assertEquals(leftCount, ir1.numDocs());
    assertEquals(rightCount, ir2.numDocs());
    
    checkContents(ir1, "1");
    checkContents(ir2, "2");
    
    ir1.close();
    ir2.close();
    
    dir1.close();
    dir2.close();
  }
  
  private void checkContents(IndexReader ir, String indexname) throws Exception {
    for (int i = 0; i < ir.maxDoc(); i++) {
      if (!ir.isDeleted(i)) {
        assertEquals(indexname, ir.document(i).get("indexname"));
      }
    }
  }
  
  private Document createDocument(int n, String indexName, 
      int numFields, NumberFormat format) {
    StringBuilder sb = new StringBuilder();
    Document doc = new Document();
    String id = format.format(n);
    doc.add(newField("id", id, Store.YES, Index.NOT_ANALYZED));
    doc.add(newField("indexname", indexName, Store.YES, Index.NOT_ANALYZED));
    sb.append("a");
    sb.append(n);
    doc.add(newField("field1", sb.toString(), Store.YES, Index.ANALYZED));
    sb.append(" b");
    sb.append(n);
    for (int i = 1; i < numFields; i++) {
      doc.add(newField("field" + (i + 1), sb.toString(), Store.YES, Index.ANALYZED));
    }
    return doc;
  }
}