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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene
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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 [email protected].
 */

package com.browseengine.bobo.service;

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

import org.apache.log4j.Logger;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.store.Directory;

import com.browseengine.bobo.api.BoboMultiReader;
import com.browseengine.bobo.api.BrowseException;
import com.browseengine.bobo.impl.BrowseServiceImpl;
import com.browseengine.bobo.impl.DefaultBrowseServiceImpl;

public class BrowseServiceFactory {

  private static Logger logger = Logger.getLogger(BrowseServiceFactory.class);

  public static BrowseService createBrowseService(File idxDir) throws BrowseException {
    if (idxDir == null) throw new IllegalArgumentException("Null index dir specified");
    return new BrowseServiceImpl(idxDir);
  }

  public static BrowseService createBrowseService(BoboMultiReader bReader) {
    return new DefaultBrowseServiceImpl(bReader);
  }

  public static BoboMultiReader getBoboIndexReader(Directory idxDir) throws BrowseException {
    try {
      if (!BoboMultiReader.indexExists(idxDir)) {
        throw new BrowseException("Index does not exist at: " + idxDir);
      }
    } catch (IOException ioe) {
      throw new BrowseException(ioe.getMessage(), ioe);
    }

    DirectoryReader reader = null;
    try {
      reader = DirectoryReader.open(idxDir);
    } catch (IOException ioe) {
      throw new BrowseException(ioe.getMessage(), ioe);
    }

    BoboMultiReader bReader = null;
    try {
      bReader = BoboMultiReader.getInstance(reader);
    } catch (IOException ioe) {
      if (reader != null) {
        try {
          reader.close();
        } catch (IOException e) {
          logger.error(e.getMessage(), e);
        }
      }
      throw new BrowseException(ioe.getMessage(), ioe);
    }
    return bReader;
  }

  public static BrowseService createBrowseService(Directory idxDir) throws BrowseException {
    BoboMultiReader bReader = getBoboIndexReader(idxDir);
    DefaultBrowseServiceImpl bs = (DefaultBrowseServiceImpl) createBrowseService(bReader);
    bs.setCloseReaderOnCleanup(true);
    return bs;
  }
}