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FunctionDelegate.h

//
// FunctionDelegate.h
//
// $Id: //poco/1.4/Foundation/include/Poco/FunctionDelegate.h#4 $
//
// Library: Foundation
// Package: Events
// Module:  FunctionDelegate
//
// Implementation of the FunctionDelegate template.
//
// Copyright (c) 2006-2011, 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_FunctionDelegate_INCLUDED
#define Foundation_FunctionDelegate_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/AbstractDelegate.h"
#include "Poco/Mutex.h"


namespace Poco {


template <class TArgs, bool hasSender = true, bool senderIsConst = true> 
00052 class FunctionDelegate: public AbstractDelegate<TArgs>
      /// Wraps a freestanding function or static member function 
      /// for use as a Delegate.
{
public:
      typedef void (*NotifyMethod)(const void*, TArgs&);

      FunctionDelegate(NotifyMethod method):
            _receiverMethod(method)
      {
      }

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

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

      bool notify(const void* sender, TArgs& arguments)
      {
            Mutex::ScopedLock lock(_mutex);
            if (_receiverMethod)
            {
                  (*_receiverMethod)(sender, arguments);
                  return true;
            }
            else return false;
      }

00095       bool equals(const AbstractDelegate<TArgs>& other) const
      {
            const FunctionDelegate* pOtherDelegate = dynamic_cast<const FunctionDelegate*>(other.unwrap());
            return pOtherDelegate && _receiverMethod == pOtherDelegate->_receiverMethod;
      }

00101       AbstractDelegate<TArgs>* clone() const
      {
            return new FunctionDelegate(*this);
      }
      
00106       void disable()
      {
            Mutex::ScopedLock lock(_mutex);
            _receiverMethod = 0;
      }

protected:
      NotifyMethod _receiverMethod;
      Mutex _mutex;

private:
      FunctionDelegate();
};


template <class TArgs> 
00122 class FunctionDelegate<TArgs, true, false>: public AbstractDelegate<TArgs>
{
public:
      typedef void (*NotifyMethod)(void*, TArgs&);

      FunctionDelegate(NotifyMethod method):
            _receiverMethod(method)
      {
      }

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

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

      bool notify(const void* sender, TArgs& arguments)
      {
            Mutex::ScopedLock lock(_mutex);
            if (_receiverMethod)
            {
                  (*_receiverMethod)(const_cast<void*>(sender), arguments);
                  return true;
            }
            else return false;
      }

00163       bool equals(const AbstractDelegate<TArgs>& other) const
      {
            const FunctionDelegate* pOtherDelegate = dynamic_cast<const FunctionDelegate*>(other.unwrap());
            return pOtherDelegate && _receiverMethod == pOtherDelegate->_receiverMethod;
      }

00169       AbstractDelegate<TArgs>* clone() const
      {
            return new FunctionDelegate(*this);
      }

00174       void disable()
      {
            Mutex::ScopedLock lock(_mutex);
            _receiverMethod = 0;
      }

protected:
      NotifyMethod _receiverMethod;
      Mutex _mutex;

private:
      FunctionDelegate();
};


template <class TArgs, bool senderIsConst> 
00190 class FunctionDelegate<TArgs, false, senderIsConst>: public AbstractDelegate<TArgs>
{
public:
      typedef void (*NotifyMethod)(TArgs&);

      FunctionDelegate(NotifyMethod method):
            _receiverMethod(method)
      {
      }

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

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

      bool notify(const void* sender, TArgs& arguments)
      {
            Mutex::ScopedLock lock(_mutex);
            if (_receiverMethod)
            {
                  (*_receiverMethod)(arguments);
                  return true; 
            }
            else return false;
      }

00231       bool equals(const AbstractDelegate<TArgs>& other) const
      {
            const FunctionDelegate* pOtherDelegate = dynamic_cast<const FunctionDelegate*>(other.unwrap());
            return pOtherDelegate && _receiverMethod == pOtherDelegate->_receiverMethod;
      }

00237       AbstractDelegate<TArgs>* clone() const
      {
            return new FunctionDelegate(*this);
      }

00242       void disable()
      {
            Mutex::ScopedLock lock(_mutex);
            _receiverMethod = 0;
      }

protected:
      NotifyMethod _receiverMethod;
      Mutex _mutex;

private:
      FunctionDelegate();
};


} // namespace Poco


#endif // Foundation_FunctionDelegate_INCLUDED

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