/* -*- 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_HELPER_H

#define ATTRIBUTE_HELPER_H

#include "attribute.h"

#include "attribute-accessor-helper.h"

#include <sstream>

#include "fatal-error.h"

namespace ns3 {

template <typename T, typename BASE>

Ptr<AttributeChecker>

MakeSimpleAttributeChecker (std::string name)

{

  struct SimpleAttributeChecker : public BASE

  {

    virtual bool Check (Attribute value) const {

      return value.DynCast<const T *> () != 0;

    }

    virtual std::string GetType (void) const {

      return m_type;

    }

    virtual bool HasTypeConstraints (void) const {

      return false;

    }

    virtual std::string GetTypeConstraints (void) const {

      return "";

    }

    virtual Attribute Create (void) const {

    }

    std::string m_type;

  } *checker = new SimpleAttributeChecker ();

  checker->m_type = name;

  return Ptr<AttributeChecker> (checker, false);

}

}

/**

 * \ingroup core

 * \defgroup AttributeHelper Attribute Helper

 *

 * All these macros can be used to generate automatically the code

 * for subclasses of AttributeValue, AttributeAccessor, and, AttributeChecker,

 * which can be used to give attribute powers to a normal class. i.e.,

 * the user class can then effectively be made an attribute.

 *

 * There are two kinds of helper macros:

 *  1) The simple macros.

 *  2) The more complex macros.

 *

 * The simple macros are implemented in terms of the complex

 * macros and should generally be prefered over the complex macros:

 *    - \ref ATTRIBUTE_HELPER_HEADER_1,

 *    - \ref ATTRIBUTE_HELPER_HEADER_2, and,

 *    - \ref ATTRIBUTE_HELPER_CPP,

 */

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro defines and generates the code for the implementation 

 * of the MakeXXXAccessor template functions. This macro is typically

 * invoked in a class header to allow users of this class to view and

 * use the template functions defined here. This macro is implemented

 * through the helper templates functions ns3::MakeAccessorHelper<>.

 */

#define ATTRIBUTE_ACCESSOR_DEFINE(type)					\

  template <typename T1>						\

  Ptr<const AttributeAccessor> Make##type##Accessor (T1 a1)		\

  {									\

    return MakeAccessorHelper<type##Value> (a1);			\

  }									\

  template <typename T1, typename T2>					\

  Ptr<const AttributeAccessor> Make##type##Accessor (T1 a1, T2 a2)	\

  {									\

    return MakeAccessorHelper<type##Value> (a1, a2);			\

  }

/**

 * \ingroup AttributeHelper

 * \param type the name of the class.

 *

 * This macro defines the class XXXValue associated to class XXX.

 * This macro is typically invoked in a class header.

 */

#define ATTRIBUTE_VALUE_DEFINE(type)					\

  class type##Value : public AttributeValue				\

  {									\

  public:								\

    type##Value ();							\

    type##Value (const type &value);					\

    void Set (const type &value);					\

    type Get (void) const;						\

    virtual Attribute Copy (void) const;				\

    virtual std::string SerializeToString (Ptr<const AttributeChecker> checker) const; \

    virtual bool DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker); \

    type##Value (Attribute value);					\

    operator Attribute () const;					\

  private:								\

    type m_value;							\

  };

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro defines the conversion operators for class XXX to and

 * from instances of type Attribute.

 * Typically invoked from xxx.h.

 */

#define ATTRIBUTE_CONVERTER_DEFINE(type)	\

  type (Attribute value);			\

  operator Attribute () const;

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro defines the XXXChecker class and the associated

 * MakeXXXChecker function.

 * Typically invoked from xxx.h.

 */

#define ATTRIBUTE_CHECKER_DEFINE(type)				\

  class type##Checker : public AttributeChecker {};		\

  Ptr<const AttributeChecker> Make##type##Checker (void);	\

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro implements the XXXValue class (without the 

 * XXXValue::SerializeToString and XXXValue::DeserializeFromString 

 * methods).

 * Typically invoked from xxx.cc.

 */

#define ATTRIBUTE_VALUE_IMPLEMENT_NO_SERIALIZE(type)			\

  type##Value::type##Value ()						\

    : m_value () {}							\

  type##Value::type##Value (const type &value)				\

  : m_value (value) {}							\

  void type##Value::Set (const type &v) {				\

    m_value = v;							\

  }									\

  type type##Value::Get (void) const {					\

    return m_value;							\

  }									\

  Attribute								\

  type##Value::Copy (void) const {					\

  }									\

  type##Value::type##Value (Attribute value)				\

  {									\

    type##Value *v = value.DynCast<type##Value *> ();			\

    if (v == 0)								\

      {									\

	NS_FATAL_ERROR ("Unexpected type of value. Expected \"" << #type << "Value\""); \

      }									\

    m_value = v->Get ();						\

  }									\

  type##Value::operator Attribute () const				\

  {									\

  }

/**

 * \ingroup AttributeHelper

 * \param type the name of the class.

 *

 * This macro implements the XXXValue class (including the 

 * XXXValue::SerializeToString and XXXValue::DeserializeFromString 

 * methods).

 * Typically invoked from xxx.cc.

 */

#define ATTRIBUTE_VALUE_IMPLEMENT(type)					\

  std::string								\

  type##Value::SerializeToString (Ptr<const AttributeChecker> checker) const { \

    std::ostringstream oss;						\

    oss << m_value;							\

    return oss.str ();							\

  }									\

  bool									\

  type##Value::DeserializeFromString (std::string value, Ptr<const AttributeChecker> checker) { \

    std::istringstream iss;						\

    iss.str (value);							\

    iss >> m_value;							\

    return !iss.bad () && !iss.fail ();					\

  }									\

  ATTRIBUTE_VALUE_IMPLEMENT_NO_SERIALIZE (type)

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro implements the MakeXXXChecker function.

 * Typically invoked from xxx.cc.

 */

#define ATTRIBUTE_CHECKER_IMPLEMENT(type)				\

  Ptr<const AttributeChecker> Make##type##Checker (void)		\

  {									\

    return MakeSimpleAttributeChecker<type##Value,type##Checker> (#type);	\

  }									\

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro implements the conversion operators to and from

 * instances of type Attribute. Typically invoked from xxx.cc.

 */

#define ATTRIBUTE_CONVERTER_IMPLEMENT(type)				\

  type::type (Attribute value)						\

  {									\

    const type##Value *v = value.DynCast<const type##Value *> ();	\

    if (v == 0)								\

      {									\

      NS_FATAL_ERROR ("Unexpected type of value. Expected \"" << #type << "Value\""); \

      }									\

    *this = v->Get ();							\

  }									\

  type::operator Attribute () const					\

  {									\

  }

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro should be invoked from a public section of the class

 * declaration.

 */

#define ATTRIBUTE_HELPER_HEADER_1(type) \

  ATTRIBUTE_CONVERTER_DEFINE (type)

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro should be invoked outside of the class

 * declaration in its public header.

 */

#define ATTRIBUTE_HELPER_HEADER_2(type)					\

  ATTRIBUTE_VALUE_DEFINE (type);					\

  ATTRIBUTE_ACCESSOR_DEFINE (type);					\

  ATTRIBUTE_CHECKER_DEFINE (type);

/**

 * \ingroup AttributeHelper

 * \param type the name of the class

 *

 * This macro should be invoked from the class implementation file.

 */

#define ATTRIBUTE_HELPER_CPP(type)                                      \

  ATTRIBUTE_CHECKER_IMPLEMENT (type);					\

  ATTRIBUTE_CONVERTER_IMPLEMENT (type);					\

  ATTRIBUTE_VALUE_IMPLEMENT (type);

#endif /* ATTRIBUTE_HELPER_H */