attribute-accessor-helper.h

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/* -*- 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
 
#include "attribute.h"
#include "unused.h"
 
namespace ns3 {
 
 
template <typename V, typename T1>
inline
Ptr<const AttributeAccessor>
MakeAccessorHelper (T1 a1);
 
 
template <typename V, typename T1, typename T2>
inline
Ptr<const AttributeAccessor>
MakeAccessorHelper (T1 a1, T2 a2);
 
 
} // namespace ns3
 
 
/***************************************************************
 *  Implementation of the templates declared above.
 ***************************************************************/
 
#include "type-traits.h"
 
namespace ns3 {
 
 
template <typename T>
struct AccessorTrait
{
  typedef typename TypeTraits<typename TypeTraits<T>::ReferencedType>::NonConstType Result;
};
 
 
template <typename T, typename U>
class AccessorHelper : public AttributeAccessor
{
public:
  AccessorHelper ()
  {}
 
  virtual bool Set (ObjectBase * object, const AttributeValue & val) const
  {
    const U *value = dynamic_cast<const U *> (&val);
    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, AttributeValue &val) const
  {
    U *value = dynamic_cast<U *> (&val);
    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;
 
};  // class AccessorHelper
 
 
template <typename V, typename T, typename U>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperOne (U T::*memberVariable)
{
  /* AttributeAcessor implementation for a class member variable. */
  class MemberVariable : public AccessorHelper<T,V>
  {
  public:
    /*
     * Construct from a class data member address.
     * \param [in] memberVariable The class data member address.
     */
    MemberVariable (U T::*memberVariable)
      : AccessorHelper<T,V> (),
        m_memberVariable (memberVariable)
    {}
 
  private:
    virtual bool DoSet (T *object, const V *v) const
    {
      typename AccessorTrait<U>::Result tmp;
      bool ok = v->GetAccessor (tmp);
      if (!ok)
        {
          return false;
        }
      (object->*m_memberVariable) = tmp;
      return true;
    }
    virtual bool DoGet (const T *object, V *v) const
    {
      v->Set (object->*m_memberVariable);
      return true;
    }
    virtual bool HasGetter (void) const
    {
      return true;
    }
    virtual bool HasSetter (void) const
    {
      return true;
    }
 
    U T::*m_memberVariable;  // Address of the class data member.
  };
  return Ptr<const AttributeAccessor> (new MemberVariable (memberVariable), false);
}
 
 
template <typename V, typename T, typename U>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperOne (U (T::*getter)(void) const)
{
  /* AttributeAccessor implementation with a class get functor method. */
  class MemberMethod : public AccessorHelper<T,V>
  {
  public:
    /*
     * Construct from a class get functor method.
     * \param [in] getter The class get functor method pointer.
     */
    MemberMethod (U (T::*getter)(void) const)
      : AccessorHelper<T,V> (),
        m_getter (getter)
    {}
 
  private:
    virtual bool DoSet (T *object, const V *v) const
    {
      NS_UNUSED (object);
      NS_UNUSED (v);
      return false;
    }
    virtual bool DoGet (const T *object, V *v) const
    {
      v->Set ((object->*m_getter)());
      return true;
    }
    virtual bool HasGetter (void) const
    {
      return true;
    }
    virtual bool HasSetter (void) const
    {
      return false;
    }
    U (T::*m_getter)(void) const;  // The class get functor method pointer.
  };
  return Ptr<const AttributeAccessor> (new MemberMethod (getter), false);
}
 
 
template <typename V, typename T, typename U>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperOne (void (T::*setter)(U))
{
  /* AttributeAccessor implementation with a class set method returning void. */
  class MemberMethod : public AccessorHelper<T,V>
  {
  public:
    /*
     * Construct from a class set method.
     * \param [in] setter The class set method pointer.
     */
    MemberMethod (void (T::*setter)(U))
      : AccessorHelper<T,V> (),
        m_setter (setter)
    {}
 
  private:
    virtual bool DoSet (T *object, const V *v) const
    {
      typename AccessorTrait<U>::Result tmp;
      bool ok = v->GetAccessor (tmp);
      if (!ok)
        {
          return false;
        }
      (object->*m_setter)(tmp);
      return true;
    }
    virtual bool DoGet (const T *object, V *v) const
    {
      NS_UNUSED (object);
      NS_UNUSED (v);
      return false;
    }
    virtual bool HasGetter (void) const
    {
      return false;
    }
    virtual bool HasSetter (void) const
    {
      return true;
    }
    void (T::*m_setter)(U);  // The class set method pointer, returning void.
  };
  return Ptr<const AttributeAccessor> (new MemberMethod (setter), false);
}
 
 
template <typename W, typename T, typename U, typename V>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperTwo (void (T::*setter)(U),
                         V (T::*getter)(void) const)
{
  /*
   * AttributeAccessor implementation with class get functor and set method,
   * returning void.
   */
  class MemberMethod : public AccessorHelper<T,W>
  {
  public:
    /*
     * Construct from class get functor and set methods.
     * \param [in] setter The class set method pointer, returning void.
     * \param [in] getter The class get functor method pointer.
     */
    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
    {
      typename AccessorTrait<U>::Result tmp;
      bool ok = v->GetAccessor (tmp);
      if (!ok)
        {
          return false;
        }
      (object->*m_setter)(tmp);
      return true;
    }
    virtual bool DoGet (const T *object, W *v) const
    {
      v->Set ((object->*m_getter)());
      return true;
    }
    virtual bool HasGetter (void) const
    {
      return true;
    }
    virtual bool HasSetter (void) const
    {
      return true;
    }
    void (T::*m_setter)(U);        // The class set method pointer, returning void.
    V (T::*m_getter)(void) const;  // The class get functor method pointer.
  };
  return Ptr<const AttributeAccessor> (new MemberMethod (setter, getter), false);
}
 
 
template <typename W, typename T, typename U, typename V>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperTwo (V (T::*getter)(void) const,
                         void (T::*setter)(U))
{
  return DoMakeAccessorHelperTwo<W> (setter, getter);
}
 
 
template <typename W, typename T, typename U, typename V>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperTwo (bool (T::*setter)(U),
                         V (T::*getter)(void) const)
{
  /*
   * AttributeAccessor implementation with class get functor and
   * set method, returning bool.
   */
  class MemberMethod : public AccessorHelper<T,W>
  {
  public:
    /*
     * Construct from class get functor and set method, returning bool.
     * \param [in] setter The class set method pointer, returning bool.
     * \param [in] getter The class get functor method pointer.
     */
    MemberMethod (bool (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
    {
      typename AccessorTrait<U>::Result tmp;
      bool ok = v->GetAccessor (tmp);
      if (!ok)
        {
          return false;
        }
      ok = (object->*m_setter)(tmp);
      return ok;
    }
    virtual bool DoGet (const T *object, W *v) const
    {
      v->Set ((object->*m_getter)());
      return true;
    }
    virtual bool HasGetter (void) const
    {
      return true;
    }
    virtual bool HasSetter (void) const
    {
      return true;
    }
    bool (T::*m_setter)(U);        // The class set method pointer, returning bool.
    V (T::*m_getter)(void) const;  // The class get functor method pointer.
  };
  return Ptr<const AttributeAccessor> (new MemberMethod (setter, getter), false);
}
 
 
template <typename W, typename T, typename U, typename V>
inline
Ptr<const AttributeAccessor>
DoMakeAccessorHelperTwo (V (T::*getter)(void) const,
                         bool (T::*setter)(U))
{
  return DoMakeAccessorHelperTwo<W> (setter, getter);
}
 
 
template <typename V, typename T1>
inline
Ptr<const AttributeAccessor>
MakeAccessorHelper (T1 a1)
{
  return DoMakeAccessorHelperOne<V> (a1);
}
 
template <typename V, typename T1, typename T2>
inline
Ptr<const AttributeAccessor>
MakeAccessorHelper (T1 a1, T2 a2)
{
  return DoMakeAccessorHelperTwo<V> (a1, a2);
}
 
} // namespace ns3
 
#endif /* ATTRIBUTE_ACCESSOR_HELPER_H */