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

//------------------------------------------------------------------------------
/**
 General boolean utility functions.
 
 @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 BooleanUtil
{
   //---------------------------------------------------------------------------
   public static Boolean valueOf(Object inValue)
   {
      Boolean result = Boolean.FALSE;

      if (inValue != null)
      {
         if (inValue instanceof Boolean)
         {
            result = (Boolean) inValue;
         }
         else
         {
            result = valueOf(inValue.toString());
         }
      }

      return result;
   }

   //---------------------------------------------------------------------------
   public static Boolean valueOf(String inValue)
   {
      Boolean result = Boolean.FALSE;

      if (StringUtil.isSet(inValue))
      {
         if (inValue.equalsIgnoreCase("true")
             || inValue.equalsIgnoreCase("T")
             || inValue.equalsIgnoreCase("yes")
             || inValue.equalsIgnoreCase("Y")
             || inValue.equalsIgnoreCase("1"))
         {
            result = Boolean.TRUE;
         }
         else
         {
            try
            {
               int intValue = Integer.valueOf(inValue);
               result = (intValue != 0);
            }
            catch (Exception e)
            {
               // Ignore
            }
         }
      }

      return result;
   }

   //---------------------------------------------------------------------------
   /**
    * Will only return TRUE or FALSE if the specified string value matches one of
    * the recognized values ("true", "false", "T", "F", "yes", "no", "Y", "N", "1", "0")
    * in a case-insensitive way. Otherwise null is returned
    * @param inValue the specified String value to evaluate
    * @return Boolean.TRUE, Boolean.FALSE, or null
    */
   public static Boolean strictValueOf(String inValue)
   {
      Boolean result = null;

      if (StringUtil.isSet(inValue))
      {
         if (inValue.equalsIgnoreCase("true")
               || inValue.equalsIgnoreCase("T")
               || inValue.equalsIgnoreCase("yes")
               || inValue.equalsIgnoreCase("Y")
               || inValue.equalsIgnoreCase("1"))
         {
            result = Boolean.TRUE;
         }
         else if (inValue.equalsIgnoreCase("false")
               || inValue.equalsIgnoreCase("F")
               || inValue.equalsIgnoreCase("no")
               || inValue.equalsIgnoreCase("N")
               || inValue.equalsIgnoreCase("0"))
         {
            result = Boolean.FALSE;
         }
      }

      return result;
   }

   //---------------------------------------------------------------------------
   public static Boolean valueOf(Character inValue)
   {
      Boolean result = Boolean.FALSE;

      if (inValue != null)
      {
         if (inValue.equals('T')
             || inValue.equals('t')
             || inValue.equals('Y')
             || inValue.equals('y'))
         {
            result = Boolean.TRUE;
         }
      }

      return result;
   }

   //---------------------------------------------------------------------------
   /**
    * Zero is considered false and all other numeric values are considered true.
    * @param inValue the specified Number value to evaluate
    * @return Boolean.TRUE, Boolean.FALSE, or null
    */
   public static Boolean valueOf(Number inValue)
   {
      Boolean result = null;

      if (inValue != null)
      {
         result = (! inValue.equals(0));
      }

      return result;
   }
}