/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2008 INRIA

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation;

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#ifndef ATTRIBUTE_ACCESSOR_HELPER_H

#define ATTRIBUTE_ACCESSOR_HELPER_H

namespace ns3 {

template <typename V, typename T1>

Ptr<const AttributeAccessor>

MakeAccessorHelper (T1 a1);

template <typename V, typename T1, typename T2>

Ptr<const AttributeAccessor>

MakeAccessorHelper (T1 a1, T2 a2);

} // namespace ns3

/***************************************************************

 *        The implementation of the above functions.

 ***************************************************************/

#include "type-traits.h"

namespace ns3 {

template <typename T, typename U>

class AccessorHelper : public AttributeAccessor

{

public:

  AccessorHelper () {}

  virtual bool Set (ObjectBase * object, Attribute val) const {

    const U *value = val.DynCast<const U*> ();

    if (value == 0)

      {

	return false;

      }

    T *obj = dynamic_cast<T *> (object);

    if (obj == 0)

      {

	return false;

      }

    return DoSet (obj, value);

  }

  virtual bool Get (const ObjectBase * object, Attribute val) const {

    U *value = val.DynCast<U*> ();

    if (value == 0)

      {

	return false;

      }

    const T *obj = dynamic_cast<const T *> (object);

    if (obj == 0)

      {

	return false;

      }

    return DoGet (obj, value);

  }

private:

  virtual bool DoSet (T *object, const U *v) const = 0;

  virtual bool DoGet (const T *object, U *v) const = 0;

};

template <typename V, typename T, typename U>

Ptr<const AttributeAccessor>

DoMakeAccessorHelperOne (U T::*memberVariable)

{

  class MemberVariable : public AccessorHelper<T,V>

    {

    public:

      MemberVariable (U T::*memberVariable)

	: AccessorHelper<T,V> (),

	m_memberVariable (memberVariable)

	{}

    private:

      virtual bool DoSet (T *object, const V *v) const {

	(object->*m_memberVariable) = U (v->Get ());

	return true;

      }

      virtual bool DoGet (const T *object, V *v) const {

	v->Set (object->*m_memberVariable);

	return true;

      }

      U T::*m_memberVariable;

    };

  return Ptr<const AttributeAccessor> (new MemberVariable (memberVariable), false);

}

template <typename V, typename T, typename U>

Ptr<const AttributeAccessor>

DoMakeAccessorHelperOne (U (T::*getter) (void) const)

{

  class MemberMethod : public AccessorHelper<T,V>

    {

    public:

      MemberMethod (U (T::*getter) (void) const)

	: AccessorHelper<T,V> (),

	m_getter (getter)

	{}

    private:

      virtual bool DoSet (T *object, const V *v) const {

	return false;

      }

      virtual bool DoGet (const T *object, V *v) const {

	v->Set ((object->*m_getter) ());

	return true;

      }

      U (T::*m_getter) (void) const;

    };

  return Ptr<const AttributeAccessor> (new MemberMethod (getter), false);

}

template <typename V, typename T, typename U>

Ptr<const AttributeAccessor>

DoMakeAccessorHelperOne (void (T::*setter) (U))

{

  class MemberMethod : public AccessorHelper<T,V>

    {

    public:

      MemberMethod (void (T::*setter) (U))

	: AccessorHelper<T,V> (),

	m_setter (setter)

	{}

    private:

      virtual bool DoSet (T *object, const V *v) const {

	(object->*m_setter) (U (v->Get ()));

	return true;

      }

      virtual bool DoGet (const T *object, V *v) const {

	return false;

      }

      void (T::*m_setter) (U);

    };

  return Ptr<const AttributeAccessor> (new MemberMethod (setter), false);

}

template <typename W, typename T, typename U, typename V>

Ptr<const AttributeAccessor>

DoMakeAccessorHelperTwo (void (T::*setter) (U), 

			  V (T::*getter) (void) const)

{

  class MemberMethod : public AccessorHelper<T,W>

    {

    public:

      MemberMethod (void (T::*setter) (U), 

		    V (T::*getter) (void) const)

	: AccessorHelper<T,W> (),

	m_setter (setter),

	m_getter (getter)

	{}

    private:

      virtual bool DoSet (T *object, const W *v) const {

	(object->*m_setter) (v->Get ());

	return true;

      }

      virtual bool DoGet (const T *object, W *v) const {

	v->Set ((object->*m_getter) ());

	return true;

      }

      void (T::*m_setter) (U);

      V (T::*m_getter) (void) const;

    };

  return Ptr<const AttributeAccessor> (new MemberMethod (setter, getter), false);

}

template <typename W, typename T, typename U, typename V>

Ptr<const AttributeAccessor>

DoMakeAccessorHelperTwo (V (T::*getter) (void) const, 

			  void (T::*setter) (U))

{

  return DoMakeAccessorHelperTwo<W> (setter, getter);

}

template <typename V, typename T1>

Ptr<const AttributeAccessor>

MakeAccessorHelper (T1 a1)

{

  return DoMakeAccessorHelperOne<V> (a1);

}

template <typename V, typename T1, typename T2>

Ptr<const AttributeAccessor>

MakeAccessorHelper (T1 a1, T2 a2)

{

  return DoMakeAccessorHelperTwo<V> (a1, a2);

}

} // namespace ns3

#endif /* ATTRIBUTE_ACCESSOR_HELPER_H */