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com.hfg xml, html, svg, and bioinformatics utility library
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package com.hfg.util.collection;

import java.util.Comparator;
import java.util.Map;
import javax.swing.SortOrder;

import com.hfg.util.CompareUtil;

//------------------------------------------------------------------------------
/**
 * Simple Comparator for sorting Map entries with Number values.
 * @author J. Alex Taylor, hairyfatguy.com
 */
//------------------------------------------------------------------------------
// com.hfg Library
//
// 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// J. Alex Taylor, President, Founder, CEO, COO, CFO, OOPS hairyfatguy.com
// [email protected]
//------------------------------------------------------------------------------

public class MapEntryNumberValueComparator implements Comparator>
{
   private SortOrder mSortOrder = SortOrder.ASCENDING;

   //##########################################################################
   // CONSTRUCTORS
   //##########################################################################

   //--------------------------------------------------------------------------
   public MapEntryNumberValueComparator()
   {
   }

   //--------------------------------------------------------------------------
   public MapEntryNumberValueComparator(SortOrder inSortOrder)
   {
      mSortOrder = inSortOrder;
   }

   //##########################################################################
   // PUBLIC METHODS
   //##########################################################################

   //--------------------------------------------------------------------------
   public int compare(Map.Entry inObj1, Map.Entry inObj2)
   {
      int result = CompareUtil.compare(inObj1.getValue(), inObj2.getValue()) * (mSortOrder == SortOrder.DESCENDING ? -1 : 1);

      if (0 == result)
      {
         if (inObj1.getKey() instanceof Comparable)
         {
            result = CompareUtil.compare((Comparable) inObj1.getKey(), (Comparable) inObj2.getKey());
         }
         else
         {
            // Compare the keys case-insensitive alphabetical
            String str1 = (inObj1.getKey() != null ? inObj1.getKey().toString() : null);
            String str2 = (inObj2.getKey() != null ? inObj2.getKey().toString() : null);
            result = CompareUtil.compareIgnoreCase(str1, str2);
         }
      }

      return result;
   }

}