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AbstractPriorityDelegate.h

//
// AbstractPriorityDelegate.h
//
// $Id: //poco/1.3/Foundation/include/Poco/AbstractPriorityDelegate.h#1 $
//
// Library: Foundation
// Package: Events
// Module:  AbstractPriorityDelegate
//
// Implementation of the AbstractPriorityDelegate template.
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#ifndef  Foundation_AbstractPriorityDelegate_INCLUDED
#define  Foundation_AbstractPriorityDelegate_INCLUDED


#include "Poco/Foundation.h"


namespace Poco {


template <class TArgs> 
00050 class AbstractPriorityDelegate
      /// Interface for PriorityDelegate and PriorityExpire.
      /// Very similar to AbstractDelegate but having two separate files (no inheritance)
      /// allows to have compile-time checks when registering an observer
      /// instead of run-time checks.
{
public:
      AbstractPriorityDelegate(void* pTarget, int prio):
            _pTarget(pTarget),
            _priority(prio)
      {
      }

      AbstractPriorityDelegate(const AbstractPriorityDelegate& del):
            _pTarget(del._pTarget),
            _priority(del._priority)
      {
      }

      virtual ~AbstractPriorityDelegate() 
      {
      }

      virtual bool notify(const void* sender, TArgs & arguments) = 0;
            /// Returns false, if the Delegate is no longer valid, thus indicating an expire

      virtual AbstractPriorityDelegate* clone() const = 0;
            // Returns a deep-copy of the object.

00079       bool operator < (const AbstractPriorityDelegate<TArgs>& other) const
            /// Operator used for comparing AbstractPriorityDelegates in a collection.
      {
            if (_priority == other._priority)
            {
                  return _pTarget < other._pTarget;
            }

            return (_priority < other._priority);
      }

      void* target() const
      {
            return _pTarget;
      }

      int priority() const
      {
            return _priority;
      }

protected:
      void* _pTarget;
      int   _priority;
};


} // namespace Poco


#endif

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