#ifndef P2P_SingleValue_hxx
#define P2P_SingleValue_hxx

#include "AbstractValue.hxx"

namespace p2p
{

class SingleValue : public AbstractValue
{
   public:
      static const resip::Data NoValue;
      
      SingleValue(const resip::Data& value)
         : mValue(value),
           mExists(true)
      {}

      const resip::Data& get() const 
      {
         if (mExists) 
         {
            return mValue;
         } else {
            return NoValue;
         }
      }
      
      void set(const resip::Data& value) 
      {
         mValue = value;
      }

      void clear() 
      {
         mExists = false;
      }

      bool isSet() const 
      {
         return mExists;
      }

   private:
      resip::Data mValue;
      bool mExists;
};

} // p2p

#endif // P2P_SingleValue_hxx
   
/* ======================================================================
 *  Copyright (c) 2008, Various contributors to the Resiprocate project
 *  All rights reserved.
 *  
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *      - Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 *      - The names of the project's contributors may not be used to
 *        endorse or promote products derived from this software without
 *        specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 *  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 *  IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 *  THE POSSIBILITY OF SUCH DAMAGE.
 *====================================================================== */

