Lucene example source code file (BooleanQueryTst.java)

This example Lucene source code file (BooleanQueryTst.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

assert, basicqueryfactory, booleanquerytst, exception, fixme, io, ioexception, ioexception, override, override, singlefieldtestdb, string, string, testcollector, testcollector

The Lucene BooleanQueryTst.java source code

package org.apache.lucene.queryParser.surround.query;

/**
 * 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 org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Query;

import org.apache.lucene.queryParser.surround.parser.QueryParser;

import org.junit.Assert;

public class BooleanQueryTst {
  String queryText;
  final int[] expectedDocNrs;
  SingleFieldTestDb dBase;
  String fieldName;
  Assert testCase;
  BasicQueryFactory qf;
  boolean verbose = true;

  public BooleanQueryTst(
      String queryText,
      int[] expectedDocNrs,
      SingleFieldTestDb dBase,
      String fieldName,
      Assert testCase,
      BasicQueryFactory qf) {
    this.queryText = queryText;
    this.expectedDocNrs = expectedDocNrs;
    this.dBase = dBase;
    this.fieldName = fieldName;
    this.testCase = testCase;
    this.qf = qf;
  }
  
  public void setVerbose(boolean verbose) {this.verbose = verbose;}

  class TestCollector extends Collector { // FIXME: use check hits from Lucene tests
    int totalMatched;
    boolean[] encountered;
    private Scorer scorer = null;
    private int docBase = 0;

    TestCollector() {
      totalMatched = 0;
      encountered = new boolean[expectedDocNrs.length];
    }

    @Override
    public void setScorer(Scorer scorer) throws IOException {
      this.scorer = scorer;
    }

    @Override
    public boolean acceptsDocsOutOfOrder() {
      return true;
    }

    @Override
    public void setNextReader(IndexReader reader, int docBase) throws IOException {
      this.docBase = docBase;
    }
    
    @Override
    public void collect(int docNr) throws IOException {
      float score = scorer.score();
      docNr += docBase;
      /* System.out.println(docNr + " '" + dBase.getDocs()[docNr] + "': " + score); */
      Assert.assertTrue(queryText + ": positive score", score > 0.0);
      Assert.assertTrue(queryText + ": too many hits", totalMatched < expectedDocNrs.length);
      int i;
      for (i = 0; i < expectedDocNrs.length; i++) {
        if ((! encountered[i]) && (expectedDocNrs[i] == docNr)) {
          encountered[i] = true;
          break;
        }
      }
      if (i == expectedDocNrs.length) {
        Assert.assertTrue(queryText + ": doc nr for hit not expected: " + docNr, false);
      }
      totalMatched++;
    }

    void checkNrHits() {
      Assert.assertEquals(queryText + ": nr of hits", expectedDocNrs.length, totalMatched);
    }
  }

  public void doTest() throws Exception {

    if (verbose) {    
        System.out.println("");
        System.out.println("Query: " + queryText);
    }
    
    SrndQuery lq = QueryParser.parse(queryText);
    
    /* if (verbose) System.out.println("Srnd: " + lq.toString()); */
    
    Query query = lq.makeLuceneQueryField(fieldName, qf);
    /* if (verbose) System.out.println("Lucene: " + query.toString()); */

    TestCollector tc = new TestCollector();
    Searcher searcher = new IndexSearcher(dBase.getDb(), true);
    try {
      searcher.search(query, tc);
    } finally {
      searcher.close();
    }
    tc.checkNrHits();
  }
}