Lucene example source code file (QueryDriver.java)

This example Lucene source code file (QueryDriver.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

bufferedreader, file, file, filereader, filereader, io, printwriter, qualitybenchmark, qualitystats, set, string, string, submissionreport, submissionreport, trectopicsreader, util

The Lucene QueryDriver.java source code

package org.apache.lucene.benchmark.quality.trec;

/**
 * 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 org.apache.lucene.benchmark.quality.trec.TrecJudge;
import org.apache.lucene.benchmark.quality.trec.TrecTopicsReader;
import org.apache.lucene.benchmark.quality.utils.SimpleQQParser;
import org.apache.lucene.benchmark.quality.utils.SubmissionReport;
import org.apache.lucene.benchmark.quality.*;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.store.FSDirectory;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.PrintWriter;
import java.util.HashSet;
import java.util.Set;


/**
 *
 *
 **/
public class QueryDriver {
  public static void main(String[] args) throws Exception {
    if (args.length < 4 || args.length > 5) {
      System.err.println("Usage: QueryDriver <topicsFile>    [querySpec]");
      System.err.println("topicsFile: input file containing queries");
      System.err.println("qrelsFile: input file containing relevance judgements");
      System.err.println("submissionFile: output submission file for trec_eval");
      System.err.println("indexDir: index directory");
      System.err.println("querySpec: string composed of fields to use in query consisting of T=title,D=description,N=narrative:");
      System.err.println("\texample: TD (query on Title + Description). The default is T (title only)");
      System.exit(1);
    }
    
    File topicsFile = new File(args[0]);
    File qrelsFile = new File(args[1]);
    SubmissionReport submitLog = new SubmissionReport(new PrintWriter(args[2]), "lucene");
    FSDirectory dir = FSDirectory.open(new File(args[3]));
    String fieldSpec = args.length == 5 ? args[4] : "T"; // default to Title-only if not specified.
    Searcher searcher = new IndexSearcher(dir, true);

    int maxResults = 1000;
    String docNameField = "docname";

    PrintWriter logger = new PrintWriter(System.out, true);

    // use trec utilities to read trec topics into quality queries
    TrecTopicsReader qReader = new TrecTopicsReader();
    QualityQuery qqs[] = qReader.readQueries(new BufferedReader(new FileReader(topicsFile)));

    // prepare judge, with trec utilities that read from a QRels file
    Judge judge = new TrecJudge(new BufferedReader(new FileReader(qrelsFile)));

    // validate topics & judgments match each other
    judge.validateData(qqs, logger);

    Set<String> fieldSet = new HashSet();
    if (fieldSpec.indexOf('T') >= 0) fieldSet.add("title");
    if (fieldSpec.indexOf('D') >= 0) fieldSet.add("description");
    if (fieldSpec.indexOf('N') >= 0) fieldSet.add("narrative");
    
    // set the parsing of quality queries into Lucene queries.
    QualityQueryParser qqParser = new SimpleQQParser(fieldSet.toArray(new String[0]), "body");

    // run the benchmark
    QualityBenchmark qrun = new QualityBenchmark(qqs, qqParser, searcher, docNameField);
    qrun.setMaxResults(maxResults);
    QualityStats stats[] = qrun.execute(judge, submitLog, logger);

    // print an avarage sum of the results
    QualityStats avg = QualityStats.average(stats);
    avg.log("SUMMARY", 2, logger, "  ");
  }
}