Package org.apache.camel.component.lucene

Source Code of org.apache.camel.component.lucene.LuceneSearcher

/**
* 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.
*/
package org.apache.camel.component.lucene;

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

import org.apache.camel.processor.lucene.support.Hit;
import org.apache.camel.processor.lucene.support.Hits;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.store.NIOFSDirectory;
import org.apache.lucene.util.Version;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LuceneSearcher {
    private static final Logger LOG = LoggerFactory.getLogger(LuceneSearcher.class);
    private Analyzer analyzer;
    private IndexSearcher indexSearcher;
    private IndexReader indexReader;
    private ScoreDoc[] hits;

    public void open(File indexDirectory, Analyzer analyzer) throws IOException {
        if (indexDirectory != null) {
            indexReader = DirectoryReader.open(new NIOFSDirectory(indexDirectory));
        } else {
            indexReader = DirectoryReader.open(new NIOFSDirectory(new File("./indexDirectory")));
        }
        indexSearcher = new IndexSearcher(indexReader);
        this.analyzer = analyzer;
    }

    public void close() throws IOException {
        indexReader.close();       
        analyzer.close();
    }
   
    public Hits search(String searchPhrase, int maxNumberOfHits) throws Exception {
        return search(searchPhrase, maxNumberOfHits, Version.LUCENE_4_9);
    }

    public Hits search(String searchPhrase, int maxNumberOfHits, Version luceneVersion) throws Exception {
        Hits searchHits = new Hits();

        int numberOfHits = doSearch(searchPhrase, maxNumberOfHits, luceneVersion);
        searchHits.setNumberOfHits(numberOfHits);

        for (ScoreDoc hit : hits) {
            Document selectedDocument = indexSearcher.doc(hit.doc);
            Hit aHit = new Hit();
            aHit.setHitLocation(hit.doc);
            aHit.setScore(hit.score);
            aHit.setData(selectedDocument.get("contents"));
            searchHits.getHit().add(aHit);
        }       

        return searchHits;
    }
               
    private int doSearch(String searchPhrase, int maxNumberOfHits, Version luceneVersion) throws NullPointerException, ParseException, IOException {
        LOG.trace("*** Search Phrase: {} ***", searchPhrase);

        QueryParser parser = new QueryParser(luceneVersion, "contents", analyzer);
        Query query = parser.parse(searchPhrase);
        TopScoreDocCollector collector = TopScoreDocCollector.create(maxNumberOfHits, true);
        indexSearcher.search(query, collector);
        hits = collector.topDocs().scoreDocs;
       
        LOG.trace("*** Search generated {} hits ***", hits.length);
        return hits.length;
    }
}
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