com.leavesfly.lia.meetlucene.Searcher.java Source code

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Here is the source code for com.leavesfly.lia.meetlucene.Searcher.java

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package com.leavesfly.lia.meetlucene;

/**
 * Copyright Manning Publications Co.
 *
 * Licensed 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 lan      
*/

import org.apache.lucene.document.Document;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.util.Version;

import java.io.File;
import java.io.IOException;

// From chapter 1

/**
 * This code was originally written for
 * Erik's Lucene intro java.net article
 */
public class Searcher {

    public static void main(String[] args) throws IllegalArgumentException, IOException, ParseException {
        if (args.length != 2) {
            throw new IllegalArgumentException("Usage: java " + Searcher.class.getName() + " <index dir> <query>");
        }

        String indexDir = args[0]; //1 
        String q = args[1]; //2   

        search(indexDir, q);
    }

    public static void search(String indexDir, String q) throws IOException, ParseException {

        Directory dir = FSDirectory.open(new File(indexDir)); //3
        IndexSearcher is = new IndexSearcher(dir); //3   

        QueryParser parser = new QueryParser(Version.LUCENE_30, // 4
                "contents", //4
                new StandardAnalyzer( //4
                        Version.LUCENE_30)); //4
        Query query = parser.parse(q); //4   
        long start = System.currentTimeMillis();
        TopDocs hits = is.search(query, 10); //5
        long end = System.currentTimeMillis();

        System.err.println("Found " + hits.totalHits + //6  
                " document(s) (in " + (end - start) + // 6
                " milliseconds) that matched query '" + // 6
                q + "':"); // 6

        for (ScoreDoc scoreDoc : hits.scoreDocs) {
            Document doc = is.doc(scoreDoc.doc); //7      
            System.out.println(doc.get("fullpath")); //8  
        }

        is.close(); //9
    }
}

/*
#1 Parse provided index directory
#2 Parse provided query string
#3 Open index
#4 Parse query
#5 Search index
#6 Write search stats
#7 Retrieve matching document
#8 Display filename
#9 Close IndexSearcher
*/