Lucene example source code file (TestStressAdvance.java)

This example Lucene source code file (TestStressAdvance.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

arraylist, document, document, exception, field, hashset, list, list, randomindexwriter, randomindexwriter, set, term, util, verbose, verbose

The Lucene TestStressAdvance.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.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.lucene.util.*;
import org.apache.lucene.store.*;
import org.apache.lucene.document.*;

public class TestStressAdvance extends LuceneTestCase {

  public void testStressAdvance() throws Exception {
    for(int iter=0;iter<3;iter++) {
      if (VERBOSE) {
        System.out.println("\nTEST: iter=" + iter);
      }
      Directory dir = newDirectory();
      RandomIndexWriter w = new RandomIndexWriter(random, dir);
      final Set<Integer> aDocs = new HashSet();
      final Document doc = new Document();
      final Field f = newField("field", "", Field.Index.NOT_ANALYZED_NO_NORMS);
      doc.add(f);
      final Field idField = newField("id", "", Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS);
      doc.add(idField);
      int num = atLeast(5000);
      for(int id=0;id<num;id++) {
        if (random.nextInt(4) == 3) {
          f.setValue("a");
          aDocs.add(id);
        } else {
          f.setValue("b");
        }
        idField.setValue(""+id);
        w.addDocument(doc);
      }

      w.optimize();

      final List<Integer> aDocIDs = new ArrayList();
      final List<Integer> bDocIDs = new ArrayList();

      final IndexReader r = w.getReader();
      final int[] idToDocID = new int[r.maxDoc()];
      for(int docID=0;docID<idToDocID.length;docID++) {
        int id = Integer.parseInt(r.document(docID).get("id"));
        if (aDocs.contains(id)) {
          aDocIDs.add(docID);
        } else {
          bDocIDs.add(docID);
        }
      }
      final TermDocs de = r.termDocs();
      
      for(int iter2=0;iter2<10;iter2++) {
        if (VERBOSE) {
          System.out.println("\nTEST: iter=" + iter + " iter2=" + iter2);
        }
        de.seek(new Term("field", "a"));
        testOne(de, aDocIDs);

        de.seek(new Term("field", "b"));
        testOne(de, bDocIDs);
      }

      w.close();
      r.close();
      dir.close();
    }
  }

  private void testOne(TermDocs docs, List<Integer> expected) throws Exception {
    if (VERBOSE) {
      System.out.println("test");
    }
    int upto = -1;
    while(upto < expected.size()) {
      if (VERBOSE) {
        System.out.println("  cycle upto=" + upto + " of " + expected.size());
      }
      final int docID;
      if (random.nextInt(4) == 1 || upto == expected.size()-1) {
        // test nextDoc()
        if (VERBOSE) {
          System.out.println("    do nextDoc");
        }
        upto++;
        if (docs.next()) {
          docID = docs.doc();
        } else {
          docID = -1;
        }
      } else {
        // test advance()
        final int inc = _TestUtil.nextInt(random, 1, expected.size()-1-upto);
        if (VERBOSE) {
          System.out.println("    do advance inc=" + inc);
        }
        upto += inc;
        if (docs.skipTo(expected.get(upto))) {
          docID = docs.doc();
        } else {
          docID = -1;
        }
      }
      if (upto == expected.size()) {
        if (VERBOSE) {
          System.out.println("  expect docID=" + -1 + " actual=" + docID);
        }
        assertEquals(-1, docID);
      } else {
        if (VERBOSE) {
          System.out.println("  expect docID=" + expected.get(upto) + " actual=" + docID);
        }
        assertTrue(docID != -1);
        assertEquals(expected.get(upto).intValue(), docID);
      }
    }
  }
}