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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.index.digest;

import java.io.IOException;
import java.util.Collection;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.StringField;

import com.browseengine.bobo.facets.FacetHandler;

public abstract class DataDigester {

  public static interface DataHandler {
    void handleDocument(Document doc) throws IOException;
  }

  protected DataDigester() {
    super();
  }

  // public static void populateDocument(Document doc,Map data,FieldConfiguration fConf){
  public static void populateDocument(Document doc, Collection> handlers) {
    StringBuilder tokenBuffer = new StringBuilder();

    for (FacetHandler handler : handlers) {
      String name = handler.getName();
      String[] values = doc.getValues(name);
      if (values != null) {
        doc.removeFields(name);
        for (String value : values) {
          doc.add(new StringField(name, value, Store.NO));
          tokenBuffer.append(' ').append(value);
        }
      }
    }
  }

  public abstract void digest(DataHandler handler) throws IOException;
}