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Lucene example source code file (TestDocIdSet.java)

This example Lucene source code file (TestDocIdSet.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, docidset, docidset, docidsetiterator, docidsetiterator, document, exception, filter, io, ioexception, ioexception, matchalldocsquery, override, override, randomindexwriter, util

The Lucene TestDocIdSet.java source code

package org.apache.lucene.search;

/**
 * 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.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;

import junit.framework.Assert;

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.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TestDocIdSet extends LuceneTestCase {
  public void testFilteredDocIdSet() throws Exception {
    final int maxdoc=10;
    final DocIdSet innerSet = new DocIdSet() {

        @Override
        public DocIdSetIterator iterator() {
          return new DocIdSetIterator() {

            int docid = -1;
            
            @Override
            public int docID() {
              return docid;
            }
            
            @Override
            public int nextDoc() throws IOException {
              docid++;
              return docid < maxdoc ? docid : (docid = NO_MORE_DOCS);
            }

            @Override
            public int advance(int target) throws IOException {
              while (nextDoc() < target) {}
              return docid;
            }
          };
        } 
      };
	  
		
    DocIdSet filteredSet = new FilteredDocIdSet(innerSet){
        @Override
        protected boolean match(int docid) {
          return docid%2 == 0;  //validate only even docids
        }	
      };
	  
    DocIdSetIterator iter = filteredSet.iterator();
    ArrayList<Integer> list = new ArrayList();
    int doc = iter.advance(3);
    if (doc != DocIdSetIterator.NO_MORE_DOCS) {
      list.add(Integer.valueOf(doc));
      while((doc = iter.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
        list.add(Integer.valueOf(doc));
      }
    }
	  
    int[] docs = new int[list.size()];
    int c=0;
    Iterator<Integer> intIter = list.iterator();
    while(intIter.hasNext()) {
      docs[c++] = intIter.next().intValue();
    }
    int[] answer = new int[]{4,6,8};
    boolean same = Arrays.equals(answer, docs);
    if (!same) {
      System.out.println("answer: " + Arrays.toString(answer));
      System.out.println("gotten: " + Arrays.toString(docs));
      fail();
    }
  }
  
  public void testNullDocIdSet() throws Exception {
    // Tests that if a Filter produces a null DocIdSet, which is given to
    // IndexSearcher, everything works fine. This came up in LUCENE-1754.
    Directory dir = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random, dir);
    Document doc = new Document();
    doc.add(newField("c", "val", Store.NO, Index.NOT_ANALYZED_NO_NORMS));
    writer.addDocument(doc);
    IndexReader reader = writer.getReader();
    writer.close();
    
    // First verify the document is searchable.
    IndexSearcher searcher = newSearcher(reader);
    Assert.assertEquals(1, searcher.search(new MatchAllDocsQuery(), 10).totalHits);
    
    // Now search w/ a Filter which returns a null DocIdSet
    Filter f = new Filter() {
      @Override
      public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
        return null;
      }
    };
    
    Assert.assertEquals(0, searcher.search(new MatchAllDocsQuery(), f, 10).totalHits);
    searcher.close();
    reader.close();
    dir.close();
  }

}

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