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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.util.Comparator;

import com.browseengine.bobo.api.BrowseHit;

public class HitCompareMulti implements Comparator {
  protected Comparator[] m_hcmp;

  public HitCompareMulti(Comparator[] hcmp) {
    m_hcmp = hcmp;
  }

  // HitCompare
  public int compare(BrowseHit h1, BrowseHit h2) {
    int retVal = 0;
    for (int i = 0; i < m_hcmp.length; ++i) {
      retVal = m_hcmp[i].compare(h1, h2);
      if (retVal != 0) break;
    }
    return retVal;
  }
}