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

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

//==============================================================================
/**
 Operating system detection class.
 
 @author J. Alex Taylor, hairyfatguy.com
 
 */
//==============================================================================
// com.hfg XML/HTML Coding 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 OS implements Comparable
{
   private String mName;


   private static Map mValueMap = new HashMap<>();
   private static OS mCurrentOS;

   public static OS Windows = new OS("Windows");
   public static OS Mac     = new OS("Mac OS X");
   public static OS UNIX    = new OS("UNIX");
   public static OS Solaris = new OS("Solaris");
   public static OS Unknown = new OS("Unknown");

   //---------------------------------------------------------------------------
   private OS(String inName)
   {
      mName = inName;
      mValueMap.put(mName, this);
   }

   //---------------------------------------------------------------------------
   @Override
   public String toString()
   {
      return name();
   }

   //---------------------------------------------------------------------------
   public String name()
   {
      return mName;
   }


   //---------------------------------------------------------------------------
   @Override
   public int hashCode()
   {
      return name().hashCode();
   }

   //---------------------------------------------------------------------------
   @Override
   public boolean equals(Object inObj2)
   {
      return (inObj2 != null
              && inObj2 instanceof OS
              && 0 == compareTo((OS) inObj2));
   }

   //---------------------------------------------------------------------------
   public int compareTo(OS inObj2)
   {
      return CompareUtil.compare(name(), inObj2.name());
   }

   //---------------------------------------------------------------------------
   public static Collection values()
   {
      return Collections.unmodifiableCollection(mValueMap.values());
   }

   //---------------------------------------------------------------------------
   public static OS valueOf(String inString)
   {
      return mValueMap.get(inString);
   }

   //---------------------------------------------------------------------------
   public static synchronized OS value()
   {
      if (null == mCurrentOS)
      {
         String sysProperty = System.getProperty("os.name").toLowerCase();
         if (sysProperty.contains("mac"))
         {
            mCurrentOS = OS.Mac;
         }
         else if (sysProperty.contains("win"))
         {
            mCurrentOS = OS.Windows;
         }
         else if (sysProperty.contains("sunos"))
         {
            mCurrentOS = OS.Solaris;
         }
         else if (sysProperty.contains("ix")
                  || (sysProperty.contains("ux")))
         {
            mCurrentOS = OS.UNIX;
         }
         else
         {
            mCurrentOS = OS.Unknown;
         }
      }

      return mCurrentOS;
   }
}