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Delegate.h

//
// Delegate.h
//
// $Id: //poco/1.3/Foundation/include/Poco/Delegate.h#2 $
//
// Library: Foundation
// Package: Events
// Module:  Delegate
//
// Implementation of the Delegate 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_Delegate_INCLUDED
#define  Foundation_Delegate_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/AbstractDelegate.h"
#include "Poco/FunctionDelegate.h"
#include "Poco/Expire.h"


namespace Poco {


template <class TObj, class TArgs, bool withSender=true> 
class Delegate: public AbstractDelegate<TArgs>
{
public:
      typedef void (TObj::*NotifyMethod)(const void*, TArgs&);

      Delegate(TObj* obj, NotifyMethod method):
            AbstractDelegate<TArgs>(obj),
            _receiverObject(obj), 
            _receiverMethod(method)
      {
      }

      Delegate(const Delegate& delegate):
            AbstractDelegate<TArgs>(delegate),
            _receiverObject(delegate._receiverObject),
            _receiverMethod(delegate._receiverMethod)
      {
      }

      ~Delegate()
      {
      }
      
      Delegate& operator = (const Delegate& delegate)
      {
            if (&delegate != this)
            {
                  this->_pTarget        = delegate._pTarget;
                  this->_receiverObject = delegate._receiverObject;
                  this->_receiverMethod = delegate._receiverMethod;
            }
            return *this;
      }

      bool notify(const void* sender, TArgs& arguments)
      {
            (_receiverObject->*_receiverMethod)(sender, arguments);
            return true; // a "standard" delegate never expires
      }

      AbstractDelegate<TArgs>* clone() const
      {
            return new Delegate(*this);
      }

protected:
      TObj*        _receiverObject;
      NotifyMethod _receiverMethod;

private:
      Delegate();
};


template <class TObj, class TArgs> 
class Delegate<TObj, TArgs, false>: public AbstractDelegate<TArgs>
{
public:
      typedef void (TObj::*NotifyMethod)(TArgs&);

      Delegate(TObj* obj, NotifyMethod method):
            AbstractDelegate<TArgs>(obj),
            _receiverObject(obj), 
            _receiverMethod(method)
      {
      }

      Delegate(const Delegate& delegate):
            AbstractDelegate<TArgs>(delegate),
            _receiverObject(delegate._receiverObject),
            _receiverMethod(delegate._receiverMethod)
      {
      }

      ~Delegate()
      {
      }
      
      Delegate& operator = (const Delegate& delegate)
      {
            if (&delegate != this)
            {
                  this->_pTarget        = delegate._pTarget;
                  this->_receiverObject = delegate._receiverObject;
                  this->_receiverMethod = delegate._receiverMethod;
            }
            return *this;
      }

      bool notify(const void*, TArgs& arguments)
      {
            (_receiverObject->*_receiverMethod)(arguments);
            return true; // a "standard" delegate never expires
      }

      AbstractDelegate<TArgs>* clone() const
      {
            return new Delegate(*this);
      }

protected:
      TObj*        _receiverObject;
      NotifyMethod _receiverMethod;

private:
      Delegate();
};


template <class TObj, class TArgs>
static Delegate<TObj, TArgs, true> delegate(TObj* pObj, void (TObj::*NotifyMethod)(const void*, TArgs&))
{
      return Delegate<TObj, TArgs, true>(pObj, NotifyMethod);
}


template <class TObj, class TArgs>
static Delegate<TObj, TArgs, false> delegate(TObj* pObj, void (TObj::*NotifyMethod)(TArgs&))
{
      return Delegate<TObj, TArgs, false>(pObj, NotifyMethod);
}



template <class TObj, class TArgs>
static Expire<TArgs> delegate(TObj* pObj, void (TObj::*NotifyMethod)(const void*, TArgs&), Timestamp::TimeDiff expireMillisecs)
{
      return Expire<TArgs>(Delegate<TObj, TArgs, true>(pObj, NotifyMethod), expireMillisecs);
}


template <class TObj, class TArgs>
static Expire<TArgs> delegate(TObj* pObj, void (TObj::*NotifyMethod)(TArgs&), Timestamp::TimeDiff expireMillisecs)
{
      return Expire<TArgs>(Delegate<TObj, TArgs, false>(pObj, NotifyMethod), expireMillisecs);
}


template <class TArgs>
static Expire<TArgs> delegate(void (*NotifyMethod)(const void*, TArgs&), Timestamp::TimeDiff expireMillisecs)
{
      return Expire<TArgs>(FunctionDelegate<TArgs, true, true>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
static Expire<TArgs> delegate(void (*NotifyMethod)(void*, TArgs&), Timestamp::TimeDiff expireMillisecs)
{
      return Expire<TArgs>(FunctionDelegate<TArgs, true, false>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
static Expire<TArgs> delegate(void (*NotifyMethod)(TArgs&), Timestamp::TimeDiff expireMillisecs)
{
      return Expire<TArgs>(FunctionDelegate<TArgs, false>( NotifyMethod), expireMillisecs);
}


template <class TArgs>
static FunctionDelegate<TArgs, true, true> delegate(void (*NotifyMethod)(const void*, TArgs&))
{
      return FunctionDelegate<TArgs, true, true>(NotifyMethod);
}


template <class TArgs>
static FunctionDelegate<TArgs, true, false> delegate(void (*NotifyMethod)(void*, TArgs&))
{
      return FunctionDelegate<TArgs, true, false>(NotifyMethod);
}


template <class TArgs>
static FunctionDelegate<TArgs, false> delegate(void (*NotifyMethod)(TArgs&))
{
      return FunctionDelegate<TArgs, false>(NotifyMethod);
}


} // namespace Poco


#endif

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