attribute-accessor-helper.h

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/*
 * 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"
 
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()
    {
    }
 
    bool Set(ObjectBase* object, const AttributeValue& val) const override
    {
        const U* value = dynamic_cast<const U*>(&val);
        if (value == nullptr)
        {
            return false;
        }
        T* obj = dynamic_cast<T*>(object);
        if (obj == nullptr)
        {
            return false;
        }
        return DoSet(obj, value);
    }
 
    bool Get(const ObjectBase* object, AttributeValue& val) const override
    {
        U* value = dynamic_cast<U*>(&val);
        if (value == nullptr)
        {
            return false;
        }
        const T* obj = dynamic_cast<const T*>(object);
        if (obj == nullptr)
        {
            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)
{
    /* AttributeAccessor 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:
        bool DoSet(T* object, const V* v) const override
        {
            typename AccessorTrait<U>::Result tmp;
            bool ok = v->GetAccessor(tmp);
            if (!ok)
            {
                return false;
            }
            (object->*m_memberVariable) = tmp;
            return true;
        }
 
        bool DoGet(const T* object, V* v) const override
        {
            v->Set(object->*m_memberVariable);
            return true;
        }
 
        bool HasGetter() const override
        {
            return true;
        }
 
        bool HasSetter() const override
        {
            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)() 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)() const)
            : AccessorHelper<T, V>(),
              m_getter(getter)
        {
        }
 
      private:
        bool DoSet(T* /* object */, const V* /* v */) const override
        {
            return false;
        }
 
        bool DoGet(const T* object, V* v) const override
        {
            v->Set((object->*m_getter)());
            return true;
        }
 
        bool HasGetter() const override
        {
            return true;
        }
 
        bool HasSetter() const override
        {
            return false;
        }
 
        U (T::*m_getter)() 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:
        bool DoSet(T* object, const V* v) const override
        {
            typename AccessorTrait<U>::Result tmp;
            bool ok = v->GetAccessor(tmp);
            if (!ok)
            {
                return false;
            }
            (object->*m_setter)(tmp);
            return true;
        }
 
        bool DoGet(const T* /* object */, V* /* v */) const override
        {
            return false;
        }
 
        bool HasGetter() const override
        {
            return false;
        }
 
        bool HasSetter() const override
        {
            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)() 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)() const)
            : AccessorHelper<T, W>(),
              m_setter(setter),
              m_getter(getter)
        {
        }
 
      private:
        bool DoSet(T* object, const W* v) const override
        {
            typename AccessorTrait<U>::Result tmp;
            bool ok = v->GetAccessor(tmp);
            if (!ok)
            {
                return false;
            }
            (object->*m_setter)(tmp);
            return true;
        }
 
        bool DoGet(const T* object, W* v) const override
        {
            v->Set((object->*m_getter)());
            return true;
        }
 
        bool HasGetter() const override
        {
            return true;
        }
 
        bool HasSetter() const override
        {
            return true;
        }
 
        void (T::*m_setter)(U);   // The class set method pointer, returning void.
        V (T::*m_getter)() 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)() 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)() 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)() const)
            : AccessorHelper<T, W>(),
              m_setter(setter),
              m_getter(getter)
        {
        }
 
      private:
        bool DoSet(T* object, const W* v) const override
        {
            typename AccessorTrait<U>::Result tmp;
            bool ok = v->GetAccessor(tmp);
            if (!ok)
            {
                return false;
            }
            ok = (object->*m_setter)(tmp);
            return ok;
        }
 
        bool DoGet(const T* object, W* v) const override
        {
            v->Set((object->*m_getter)());
            return true;
        }
 
        bool HasGetter() const override
        {
            return true;
        }
 
        bool HasSetter() const override
        {
            return true;
        }
 
        bool (T::*m_setter)(U);   // The class set method pointer, returning bool.
        V (T::*m_getter)() 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)() 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 */