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Lucene example source code file (TestBooleanQuery.java)

This example Lucene source code file (TestBooleanQuery.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

booleanquery, booleanquery, directory, document, document, exception, indexreader, indexsearcher, phrasequery, randomindexwriter, term, term, termquery, termquery, threading, threads

The Lucene TestBooleanQuery.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.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TestBooleanQuery extends LuceneTestCase {
  
  public void testEquality() throws Exception {
    BooleanQuery bq1 = new BooleanQuery();
    bq1.add(new TermQuery(new Term("field", "value1")), BooleanClause.Occur.SHOULD);
    bq1.add(new TermQuery(new Term("field", "value2")), BooleanClause.Occur.SHOULD);
    BooleanQuery nested1 = new BooleanQuery();
    nested1.add(new TermQuery(new Term("field", "nestedvalue1")), BooleanClause.Occur.SHOULD);
    nested1.add(new TermQuery(new Term("field", "nestedvalue2")), BooleanClause.Occur.SHOULD);
    bq1.add(nested1, BooleanClause.Occur.SHOULD);

    BooleanQuery bq2 = new BooleanQuery();
    bq2.add(new TermQuery(new Term("field", "value1")), BooleanClause.Occur.SHOULD);
    bq2.add(new TermQuery(new Term("field", "value2")), BooleanClause.Occur.SHOULD);
    BooleanQuery nested2 = new BooleanQuery();
    nested2.add(new TermQuery(new Term("field", "nestedvalue1")), BooleanClause.Occur.SHOULD);
    nested2.add(new TermQuery(new Term("field", "nestedvalue2")), BooleanClause.Occur.SHOULD);
    bq2.add(nested2, BooleanClause.Occur.SHOULD);

    assertEquals(bq1, bq2);
  }

  public void testException() {
    try {
      BooleanQuery.setMaxClauseCount(0);
      fail();
    } catch (IllegalArgumentException e) {
      // okay
    }
  }

  // LUCENE-1630
  public void testNullOrSubScorer() throws Throwable {
    Directory dir = newDirectory();
    RandomIndexWriter w = new RandomIndexWriter(random, dir);
    Document doc = new Document();
    doc.add(newField("field", "a b c d", Field.Store.NO, Field.Index.ANALYZED));
    w.addDocument(doc);

    IndexReader r = w.getReader();
    IndexSearcher s = newSearcher(r);
    BooleanQuery q = new BooleanQuery();
    q.add(new TermQuery(new Term("field", "a")), BooleanClause.Occur.SHOULD);

    // LUCENE-2617: make sure that a term not in the index still contributes to the score via coord factor
    float score = s.search(q, 10).getMaxScore();
    Query subQuery = new TermQuery(new Term("field", "not_in_index"));
    subQuery.setBoost(0);
    q.add(subQuery, BooleanClause.Occur.SHOULD);
    float score2 = s.search(q, 10).getMaxScore();
    assertEquals(score*.5, score2, 1e-6);

    // now test BooleanScorer2
    subQuery = new TermQuery(new Term("field", "b"));
    subQuery.setBoost(0);
    q.add(subQuery, BooleanClause.Occur.MUST);
    score2 = s.search(q, 10).getMaxScore();
    assertEquals(score*(2.0/3), score2, 1e-6);
 
    // PhraseQuery w/ no terms added returns a null scorer
    PhraseQuery pq = new PhraseQuery();
    q.add(pq, BooleanClause.Occur.SHOULD);
    assertEquals(1, s.search(q, 10).totalHits);

    // A required clause which returns null scorer should return null scorer to
    // IndexSearcher.
    q = new BooleanQuery();
    pq = new PhraseQuery();
    q.add(new TermQuery(new Term("field", "a")), BooleanClause.Occur.SHOULD);
    q.add(pq, BooleanClause.Occur.MUST);
    assertEquals(0, s.search(q, 10).totalHits);

    DisjunctionMaxQuery dmq = new DisjunctionMaxQuery(1.0f);
    dmq.add(new TermQuery(new Term("field", "a")));
    dmq.add(pq);
    assertEquals(1, s.search(dmq, 10).totalHits);
    
    s.close();
    r.close();
    w.close();
    dir.close();
  }
  
  public void testDeMorgan() throws Exception {
    Directory dir1 = newDirectory();
    RandomIndexWriter iw1 = new RandomIndexWriter(random, dir1);
    Document doc1 = new Document();
    doc1.add(newField("field", "foo bar", Field.Index.ANALYZED));
    iw1.addDocument(doc1);
    IndexReader reader1 = iw1.getReader();
    iw1.close();
    
    Directory dir2 = newDirectory();
    RandomIndexWriter iw2 = new RandomIndexWriter(random, dir2);
    Document doc2 = new Document();
    doc2.add(newField("field", "foo baz", Field.Index.ANALYZED));
    iw2.addDocument(doc2);
    IndexReader reader2 = iw2.getReader();
    iw2.close();
    
    QueryParser qp = new QueryParser(TEST_VERSION_CURRENT, "field", new MockAnalyzer(random));
    qp.setMultiTermRewriteMethod(MultiTermQuery.SCORING_BOOLEAN_QUERY_REWRITE);
    
    MultiReader multireader = new MultiReader(reader1, reader2);
    IndexSearcher searcher = newSearcher(multireader);
    assertEquals(0, searcher.search(qp.parse("+foo -ba*"), 10).totalHits);
    searcher.close();
    
    final ExecutorService es = Executors.newCachedThreadPool();
    searcher = new IndexSearcher(multireader, es);
    if (VERBOSE)
      System.out.println("rewritten form: " + searcher.rewrite(qp.parse("+foo -ba*")));
    assertEquals(0, searcher.search(qp.parse("+foo -ba*"), 10).totalHits);
    es.shutdown();
    es.awaitTermination(1, TimeUnit.SECONDS);

    multireader.close();
    reader1.close();
    reader2.close();
    dir1.close();
    dir2.close();
  }
}

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