object-ptr-container.h

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/*
 * Copyright (c) 2007 INRIA, Mathieu Lacage
 *
 * 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@gmail.com>
 */
#ifndef OBJECT_PTR_CONTAINER_H
#define OBJECT_PTR_CONTAINER_H
 
#include "attribute.h"
#include "object.h"
#include "ptr.h"
 
#include <map>
 
namespace ns3
{
 
class ObjectPtrContainerValue : public AttributeValue
{
  public:
    typedef std::map<std::size_t, Ptr<Object>>::const_iterator Iterator;
 
    ObjectPtrContainerValue();
 
    Iterator Begin() const;
    Iterator End() const;
    std::size_t GetN() const;
    Ptr<Object> Get(std::size_t i) const;
 
    Ptr<AttributeValue> Copy() const override;
    std::string SerializeToString(Ptr<const AttributeChecker> checker) const override;
    bool DeserializeFromString(std::string value, Ptr<const AttributeChecker> checker) override;
 
  private:
    friend class ObjectPtrContainerAccessor;
    std::map<std::size_t, Ptr<Object>> m_objects;
};
 
template <typename T, typename U, typename INDEX>
Ptr<const AttributeAccessor> MakeObjectPtrContainerAccessor(Ptr<U> (T::*get)(INDEX) const,
                                                            INDEX (T::*getN)() const);
 
template <typename T, typename U, typename INDEX>
Ptr<const AttributeAccessor> MakeObjectPtrContainerAccessor(INDEX (T::*getN)() const,
                                                            Ptr<U> (T::*get)(INDEX) const);
 
class ObjectPtrContainerChecker : public AttributeChecker
{
  public:
    virtual TypeId GetItemTypeId() const = 0;
};
 
template <typename T>
Ptr<const AttributeChecker> MakeObjectPtrContainerChecker();
 
} // namespace ns3
 
/***************************************************************
 *        The implementation of the above functions.
 ***************************************************************/
 
namespace ns3
{
 
namespace internal
{
 
template <typename T>
class ObjectPtrContainerChecker : public ns3::ObjectPtrContainerChecker
{
  public:
    TypeId GetItemTypeId() const override
    {
        return T::GetTypeId();
    }
 
    bool Check(const AttributeValue& value) const override
    {
        return dynamic_cast<const ObjectPtrContainerValue*>(&value) != nullptr;
    }
 
    std::string GetValueTypeName() const override
    {
        return "ns3::ObjectPtrContainerValue";
    }
 
    bool HasUnderlyingTypeInformation() const override
    {
        return true;
    }
 
    std::string GetUnderlyingTypeInformation() const override
    {
        return "ns3::Ptr< " + T::GetTypeId().GetName() + " >";
    }
 
    Ptr<AttributeValue> Create() const override
    {
        return ns3::Create<ObjectPtrContainerValue>();
    }
 
    bool Copy(const AttributeValue& source, AttributeValue& destination) const override
    {
        const auto src = dynamic_cast<const ObjectPtrContainerValue*>(&source);
        auto dst = dynamic_cast<ObjectPtrContainerValue*>(&destination);
        if (src == nullptr || dst == nullptr)
        {
            return false;
        }
        *dst = *src;
        return true;
    }
};
 
} // namespace internal
 
class ObjectPtrContainerAccessor : public AttributeAccessor
{
  public:
    bool Set(ObjectBase* object, const AttributeValue& value) const override;
    bool Get(const ObjectBase* object, AttributeValue& value) const override;
    bool HasGetter() const override;
    bool HasSetter() const override;
 
  private:
    virtual bool DoGetN(const ObjectBase* object, std::size_t* n) const = 0;
    virtual Ptr<Object> DoGet(const ObjectBase* object,
                              std::size_t i,
                              std::size_t* index) const = 0;
};
 
template <typename T, typename U, typename INDEX>
Ptr<const AttributeAccessor>
MakeObjectPtrContainerAccessor(Ptr<U> (T::*get)(INDEX) const, INDEX (T::*getN)() const)
{
    struct MemberGetters : public ObjectPtrContainerAccessor
    {
        bool DoGetN(const ObjectBase* object, std::size_t* n) const override
        {
            const T* obj = dynamic_cast<const T*>(object);
            if (obj == nullptr)
            {
                return false;
            }
            *n = (obj->*m_getN)();
            return true;
        }
 
        Ptr<Object> DoGet(const ObjectBase* object,
                          std::size_t i,
                          std::size_t* index) const override
        {
            const T* obj = static_cast<const T*>(object);
            *index = i;
            return (obj->*m_get)(i);
        }
 
        Ptr<U> (T::*m_get)(INDEX) const;
        INDEX (T::*m_getN)() const;
    }* spec = new MemberGetters();
 
    spec->m_get = get;
    spec->m_getN = getN;
    return Ptr<const AttributeAccessor>(spec, false);
}
 
template <typename T, typename U, typename INDEX>
Ptr<const AttributeAccessor>
MakeObjectPtrContainerAccessor(INDEX (T::*getN)() const, Ptr<U> (T::*get)(INDEX) const)
{
    return MakeObjectPtrContainerAccessor(get, getN);
}
 
template <typename T>
Ptr<const AttributeChecker>
MakeObjectPtrContainerChecker()
{
    return Create<internal::ObjectPtrContainerChecker<T>>();
}
 
} // namespace ns3
 
#endif /* OBJECT_PTR_CONTAINER_H */