/* 
 * Copyright (C) 2008 Trinity <http://www.trinitycore.org/>
 *
 * Thanks to the original authors: MaNGOS <http://www.mangosproject.org/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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
 */

#ifndef TRINITY_TYPECONTAINERVISITOR_H
#define TRINITY_TYPECONTAINERVISITOR_H

/*
 * @class TypeContainerVisitor is implemented as a visitor pattern.  It is
 * a visitor to the TypeContainerList or TypeContainerMapList.  The visitor has
 * to overload its types as a visit method is called.
 */

#include "Platform/Define.h"
#include "TypeContainer.h"

// forward declaration
template<class T, class Y> class TypeContainerVisitor;

// visitor helper
template<class VISITOR, class TYPE_CONTAINER> void VisitorHelper(VISITOR &v, TYPE_CONTAINER &c)
{
    v.Visit(c);
};

// terminate condition for container list
template<class VISITOR> void VisitorHelper(VISITOR &v, ContainerList<TypeNull> &c)
{
}

template<class VISITOR, class T> void VisitorHelper(VISITOR &v, ContainerList<T> &c)
{
    v.Visit(c._element);
}

// recursion for container list
template<class VISITOR, class H, class T> void VisitorHelper(VISITOR &v, ContainerList<TypeList<H, T> > &c)
{
    VisitorHelper(v, c._elements);
    VisitorHelper(v, c._TailElements);
}

// terminate condition container map list
template<class VISITOR> void VisitorHelper(VISITOR &/*v*/, ContainerMapList<TypeNull> &/*c*/)
{
}

template<class VISITOR, class T> void VisitorHelper(VISITOR &v, ContainerMapList<T> &c)
{
    v.Visit(c._element);
}

// recursion container map list
template<class VISITOR, class H, class T> void VisitorHelper(VISITOR &v, ContainerMapList<TypeList<H, T> > &c)
{
    VisitorHelper(v, c._elements);
    VisitorHelper(v, c._TailElements);
}

// array list
template<class VISITOR, class T> void VisitorHelper(VISITOR &v, ContainerArrayList<T> &c)
{
    v.Visit(c._element);
}

template<class VISITOR> void VisitorHelper(VISITOR &/*v*/, ContainerArrayList<TypeNull> &/*c*/)
{
}

// recursion
template<class VISITOR, class H, class T> void VisitorHelper(VISITOR &v, ContainerArrayList<TypeList<H, T> > &c)
{
    VisitorHelper(v, c._elements);
    VisitorHelper(v, c._TailElements);
}

// for TypeMapContainer
template<class VISITOR, class OBJECT_TYPES> void VisitorHelper(VISITOR &v, TypeMapContainer<OBJECT_TYPES> &c)
{
    VisitorHelper(v, c.GetElements());
}

template<class VISITOR, class TYPE_CONTAINER>
class TRINITY_DLL_DECL TypeContainerVisitor
{
    public:
        TypeContainerVisitor(VISITOR &v) : i_visitor(v) {}

        void Visit(TYPE_CONTAINER &c)
        {
            VisitorHelper(i_visitor, c);
        }

        void Visit(const TYPE_CONTAINER &c) const
        {
            VisitorHelper(i_visitor, c);
        }

    private:
        VISITOR &i_visitor;
};
#endif
