com.browseengine.bobo.impl.BrowseServiceImpl.java Source code

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Here is the source code for com.browseengine.bobo.impl.BrowseServiceImpl.java

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/**
 * Bobo Browse Engine - High performance faceted/parametric search implementation 
 * that handles various types of semi-structured data.  Written in Java.
 * 
 * Copyright (C) 2005-2006  John Wang
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * To contact the project administrators for the bobo-browse project, 
 * please go to https://sourceforge.net/projects/bobo-browse/, or 
 * send mail to owner@browseengine.com.
 */

package com.browseengine.bobo.impl;

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

import org.apache.log4j.Logger;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

import com.browseengine.bobo.api.BoboIndexReader;
import com.browseengine.bobo.api.BrowseException;
import com.browseengine.bobo.api.BrowseRequest;
import com.browseengine.bobo.api.BrowseResult;
import com.browseengine.bobo.service.BrowseService;
import com.browseengine.bobo.service.BrowseServiceFactory;

public class BrowseServiceImpl implements BrowseService {
    private static final Logger logger = Logger.getLogger(BrowseServiceImpl.class);
    private final File _idxDir;
    private BoboIndexReader _reader;

    public BrowseServiceImpl(File idxDir) {
        super();
        _idxDir = idxDir;
        try {
            _reader = newIndexReader();
        } catch (IOException e) {
            logger.error(e.getMessage(), e);
        }
    }

    public BrowseServiceImpl() {
        this(new File(System.getProperty("index.directory")));
    }

    private BoboIndexReader newIndexReader() throws IOException {
        Directory idxDir = FSDirectory.open(_idxDir);
        return newIndexReader(idxDir);
    }

    public static BoboIndexReader newIndexReader(Directory idxDir) throws IOException {
        if (!IndexReader.indexExists(idxDir)) {
            return null;
        }

        long start = System.currentTimeMillis();

        IndexReader ir = IndexReader.open(idxDir, true);
        BoboIndexReader reader;

        try {
            reader = BoboIndexReader.getInstance(ir);
        } catch (IOException ioe) {
            try {
                ir.close();
            } catch (IOException ioe2) {
            }
            throw ioe;
        }

        long end = System.currentTimeMillis();

        if (logger.isDebugEnabled()) {
            logger.debug("New index loading took: " + (end - start));
        }

        return reader;
    }

    public synchronized void close() throws BrowseException {
        try {
            if (_reader != null) {
                _reader.close();
            }
        } catch (IOException e) {
            throw new BrowseException(e.getMessage(), e);
        }
    }

    public BrowseResult browse(BrowseRequest req) throws BrowseException {
        return BrowseServiceFactory.createBrowseService(_reader).browse(req);
    }
}