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Bobo is a Faceted Search implementation written purely in Java, an extension of Apache Lucene

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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.FSDirectory;

import com.browseengine.bobo.api.BoboBrowser;
import com.browseengine.bobo.api.BoboMultiReader;
import com.browseengine.bobo.api.BrowseRequest;
import com.browseengine.bobo.api.BrowseResult;

public class BoboService {
  private static Logger logger = Logger.getLogger(BoboService.class);

  private final File _idxDir;
  private BoboMultiReader _boboReader;

  public BoboService(String path) {
    this(new File(path));
  }

  public BoboService(File idxDir) {
    _idxDir = idxDir;
    _boboReader = null;
  }

  public BrowseResult browse(BrowseRequest req) {
    BoboBrowser browser = null;
    try {
      browser = new BoboBrowser(_boboReader);
      return browser.browse(req);
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      return new BrowseResult();
    } finally {
      if (browser != null) {
        try {
          browser.close();
        } catch (IOException e) {
          logger.error(e.getMessage());
        }
      }
    }
  }

  public void start() throws IOException {
    DirectoryReader reader = DirectoryReader.open(FSDirectory.open(_idxDir));
    try {
      _boboReader = BoboMultiReader.getInstance(reader);
    } catch (IOException ioe) {
      if (reader != null) {
        reader.close();
      }
    }
  }

  public void shutdown() {
    if (_boboReader != null) {
      try {
        _boboReader.close();
      } catch (IOException e) {
        logger.error(e.getMessage());
      }
    }
  }
}