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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.facets.data;

import java.text.DecimalFormat;

public abstract class TermNumberList extends TermValueList {

  private static final String DEFAULT_FORMATTING_STRING = "0000000000";
  protected ThreadLocal _formatter = null;
  protected String _formatString = null;

  protected TermNumberList() {
    super();
    setFormatString(DEFAULT_FORMATTING_STRING);
  }

  protected TermNumberList(String formatString) {
    super();
    setFormatString(formatString);
  }

  protected TermNumberList(int capacity, String formatString) {
    super(capacity);
    setFormatString(formatString);
  }

  protected void setFormatString(String formatString) {
    _formatString = formatString;
    _formatter = new ThreadLocal() {
      protected DecimalFormat initialValue() {
        if (_formatString != null) {
          return new DecimalFormat(_formatString);
        } else {
          return null;
        }

      }
    };
  }

  public String getFormatString() {
    return _formatString;
  }

  protected abstract Object parseString(String o);

  public abstract double getDoubleValue(int index);

  @Override
  public String format(Object o) {
    if (o == null) return null;
    if (o instanceof String) {
      o = parseString((String) o);
    }
    if (_formatter == null) {
      return String.valueOf(o);
    } else {
      DecimalFormat formatter = _formatter.get();
      if (formatter == null) return String.valueOf(o);
      return formatter.format(o);
    }
  }
}