attribute-container.h

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/*
 * Copyright (c) 2018 Caliola Engineering, LLC.
 *
 * 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
 *
 * Author: Jared Dulmage <jared.dulmage@caliola.com>
 */
 
#ifndef ATTRIBUTE_CONTAINER_H
#define ATTRIBUTE_CONTAINER_H
 
#include <ns3/attribute-helper.h>
#include <ns3/string.h>
 
#include <algorithm>
#include <iterator>
#include <list>
#include <sstream>
#include <type_traits>
#include <typeinfo>
#include <utility>
 
namespace ns3
{
 
class AttributeChecker;
 
// A = attribute value type, C = container type to return
template <class A, char Sep = ',', template <class...> class C = std::list>
class AttributeContainerValue : public AttributeValue
{
  public:
    typedef A attribute_type;
    typedef Ptr<A> value_type;
    typedef std::list<value_type> container_type;
    typedef typename container_type::const_iterator const_iterator;
    typedef typename container_type::iterator iterator;
    typedef typename container_type::size_type size_type;
    typedef typename AttributeContainerValue::const_iterator Iterator; // NS3 type
 
    // use underlying AttributeValue to get return element type
    typedef typename std::invoke_result_t<decltype(&A::Get), A> item_type;
    typedef C<item_type> result_type;
 
    AttributeContainerValue();
 
    template <class CONTAINER>
    AttributeContainerValue(const CONTAINER& c);
 
    template <class ITER>
    AttributeContainerValue(const ITER begin, const ITER end);
 
    ~AttributeContainerValue() override;
 
    // Inherited
    Ptr<AttributeValue> Copy() const override;
    bool DeserializeFromString(std::string value, Ptr<const AttributeChecker> checker) override;
    std::string SerializeToString(Ptr<const AttributeChecker> checker) const override;
 
    // defacto pure virtuals to integrate with built-in accessor code
    result_type Get() const;
    template <class T>
    void Set(const T& c);
    template <typename T>
    bool GetAccessor(T& value) const;
 
    // NS3 interface
    size_type GetN() const;
    Iterator Begin();
    Iterator End();
 
    // STL-interface
    size_type size() const;
    iterator begin();
    iterator end();
    const_iterator begin() const;
    const_iterator end() const;
 
  private:
    template <class ITER>
    Ptr<AttributeContainerValue<A, Sep, C>> CopyFrom(const ITER begin, const ITER end);
 
    container_type m_container; 
};
 
class AttributeContainerChecker : public AttributeChecker
{
  public:
    virtual void SetItemChecker(Ptr<const AttributeChecker> itemchecker) = 0;
    virtual Ptr<const AttributeChecker> GetItemChecker() const = 0;
};
 
template <class A, char Sep, template <class...> class C>
Ptr<AttributeChecker> MakeAttributeContainerChecker(
    const AttributeContainerValue<A, Sep, C>& value);
 
template <class A, char Sep = ',', template <class...> class C = std::list>
Ptr<const AttributeChecker> MakeAttributeContainerChecker(Ptr<const AttributeChecker> itemchecker);
 
template <class A, char Sep = ',', template <class...> class C = std::list>
Ptr<AttributeChecker> MakeAttributeContainerChecker();
 
template <typename A, char Sep = ',', template <typename...> class C = std::list, typename T1>
Ptr<const AttributeAccessor> MakeAttributeContainerAccessor(T1 a1);
 
template <typename A,
          char Sep = ',',
          template <typename...> class C = std::list,
          typename T1,
          typename T2>
Ptr<const AttributeAccessor> MakeAttributeContainerAccessor(T1 a1, T2 a2);
 
} // namespace ns3
 
/*****************************************************************************
 * Implementation below
 *****************************************************************************/
 
namespace ns3
{
 
namespace internal
{
 
template <class A, char Sep, template <class...> class C>
class AttributeContainerChecker : public ns3::AttributeContainerChecker
{
  public:
    AttributeContainerChecker();
    explicit AttributeContainerChecker(Ptr<const AttributeChecker> itemchecker);
    void SetItemChecker(Ptr<const AttributeChecker> itemchecker) override;
    Ptr<const AttributeChecker> GetItemChecker() const override;
 
  private:
    Ptr<const AttributeChecker> m_itemchecker; 
};
 
template <class A, char Sep, template <class...> class C>
AttributeContainerChecker<A, Sep, C>::AttributeContainerChecker()
    : m_itemchecker(nullptr)
{
}
 
template <class A, char Sep, template <class...> class C>
AttributeContainerChecker<A, Sep, C>::AttributeContainerChecker(
    Ptr<const AttributeChecker> itemchecker)
    : m_itemchecker(itemchecker)
{
}
 
template <class A, char Sep, template <class...> class C>
void
AttributeContainerChecker<A, Sep, C>::SetItemChecker(Ptr<const AttributeChecker> itemchecker)
{
    m_itemchecker = itemchecker;
}
 
template <class A, char Sep, template <class...> class C>
Ptr<const AttributeChecker>
AttributeContainerChecker<A, Sep, C>::GetItemChecker() const
{
    return m_itemchecker;
}
 
} // namespace internal
 
template <class A, char Sep, template <class...> class C>
Ptr<AttributeChecker>
MakeAttributeContainerChecker(const AttributeContainerValue<A, Sep, C>& value)
{
    return MakeAttributeContainerChecker<A, Sep, C>();
}
 
template <class A, char Sep, template <class...> class C>
Ptr<const AttributeChecker>
MakeAttributeContainerChecker(Ptr<const AttributeChecker> itemchecker)
{
    auto checker = MakeAttributeContainerChecker<A, Sep, C>();
    auto acchecker = DynamicCast<AttributeContainerChecker>(checker);
    acchecker->SetItemChecker(itemchecker);
    return checker;
}
 
template <class A, char Sep, template <class...> class C>
Ptr<AttributeChecker>
MakeAttributeContainerChecker()
{
    std::string containerType;
    std::string underlyingType;
    typedef AttributeContainerValue<A, Sep, C> T;
    {
        std::ostringstream oss;
        oss << "ns3::AttributeContainerValue<" << typeid(typename T::attribute_type).name() << ", "
            << typeid(typename T::container_type).name() << ">";
        containerType = oss.str();
    }
 
    {
        std::ostringstream oss;
        oss << "ns3::Ptr<" << typeid(typename T::attribute_type).name() << ">";
        underlyingType = oss.str();
    }
 
    return MakeSimpleAttributeChecker<T, internal::AttributeContainerChecker<A, Sep, C>>(
        containerType,
        underlyingType);
}
 
template <class A, char Sep, template <class...> class C>
AttributeContainerValue<A, Sep, C>::AttributeContainerValue()
{
}
 
template <class A, char Sep, template <class...> class C>
template <class CONTAINER>
AttributeContainerValue<A, Sep, C>::AttributeContainerValue(const CONTAINER& c)
    : AttributeContainerValue<A, Sep, C>(c.begin(), c.end())
{
}
 
template <class A, char Sep, template <class...> class C>
template <class ITER>
AttributeContainerValue<A, Sep, C>::AttributeContainerValue(const ITER begin, const ITER end)
    : AttributeContainerValue()
{
    CopyFrom(begin, end);
}
 
template <class A, char Sep, template <class...> class C>
AttributeContainerValue<A, Sep, C>::~AttributeContainerValue()
{
    m_container.clear();
}
 
template <class A, char Sep, template <class...> class C>
Ptr<AttributeValue>
AttributeContainerValue<A, Sep, C>::Copy() const
{
    auto c = Create<AttributeContainerValue<A, Sep, C>>();
    c->m_container = m_container;
    return c;
}
 
template <class A, char Sep, template <class...> class C>
bool
AttributeContainerValue<A, Sep, C>::DeserializeFromString(std::string value,
                                                          Ptr<const AttributeChecker> checker)
{
    auto acchecker = DynamicCast<const AttributeContainerChecker>(checker);
    if (!acchecker)
    {
        return false;
    }
 
    std::istringstream iss(value); // copies value
    while (std::getline(iss, value, Sep))
    {
        auto avalue = acchecker->GetItemChecker()->CreateValidValue(StringValue(value));
        if (!avalue)
        {
            return false;
        }
 
        auto attr = DynamicCast<A>(avalue);
        if (!attr)
        {
            return false;
        }
 
        // TODO(jared): make insertion more generic?
        m_container.push_back(attr);
    }
    return true;
}
 
template <class A, char Sep, template <class...> class C>
std::string
AttributeContainerValue<A, Sep, C>::SerializeToString(Ptr<const AttributeChecker> checker) const
{
    std::ostringstream oss;
    bool first = true;
    for (auto attr : *this)
    {
        if (!first)
        {
            oss << Sep;
        }
        oss << attr->SerializeToString(checker);
        first = false;
    }
    return oss.str();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::result_type
AttributeContainerValue<A, Sep, C>::Get() const
{
    result_type c;
    for (const value_type& a : *this)
    {
        c.insert(c.end(), a->Get());
    }
    return c;
}
 
template <class A, char Sep, template <class...> class C>
template <typename T>
bool
AttributeContainerValue<A, Sep, C>::GetAccessor(T& value) const
{
    result_type src = Get();
    value.clear();
    std::copy(src.begin(), src.end(), std::inserter(value, value.end()));
    return true;
}
 
template <class A, char Sep, template <class...> class C>
template <class T>
void
AttributeContainerValue<A, Sep, C>::Set(const T& c)
{
    m_container.clear();
    CopyFrom(c.begin(), c.end());
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::size_type
AttributeContainerValue<A, Sep, C>::GetN() const
{
    return size();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::Iterator
AttributeContainerValue<A, Sep, C>::Begin()
{
    return begin();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::Iterator
AttributeContainerValue<A, Sep, C>::End()
{
    return end();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::size_type
AttributeContainerValue<A, Sep, C>::size() const
{
    return m_container.size();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::iterator
AttributeContainerValue<A, Sep, C>::begin()
{
    return m_container.begin();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::iterator
AttributeContainerValue<A, Sep, C>::end()
{
    return m_container.end();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::const_iterator
AttributeContainerValue<A, Sep, C>::begin() const
{
    return m_container.cbegin();
}
 
template <class A, char Sep, template <class...> class C>
typename AttributeContainerValue<A, Sep, C>::const_iterator
AttributeContainerValue<A, Sep, C>::end() const
{
    return m_container.cend();
}
 
template <class A, char Sep, template <class...> class C>
template <class ITER>
Ptr<AttributeContainerValue<A, Sep, C>>
AttributeContainerValue<A, Sep, C>::CopyFrom(const ITER begin, const ITER end)
{
    for (ITER iter = begin; iter != end; ++iter)
    {
        m_container.push_back(Create<A>(*iter));
    }
    return this;
}
 
template <typename A, char Sep, template <typename...> class C, typename T1>
Ptr<const AttributeAccessor>
MakeAttributeContainerAccessor(T1 a1)
{
    return MakeAccessorHelper<AttributeContainerValue<A, Sep, C>>(a1);
}
 
template <typename A, char Sep, template <typename...> class C, typename T1, typename T2>
Ptr<const AttributeAccessor>
MakeAttributeContainerAccessor(T1 a1, T2 a2)
{
    return MakeAccessorHelper<AttributeContainerValue<A, Sep, C>>(a1, a2);
}
 
} // namespace ns3
 
#endif // ATTRIBUTE_CONTAINER_H