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// file : XSCRT/Traversal.hpp
// author : Boris Kolpackov <boris@dre.vanderbilt.edu>
#ifndef XSCRT_TRAVERSAL_HPP
#define XSCRT_TRAVERSAL_HPP
#include <map>
#include <set>
#include <vector>
#include "ace/XML_Utils/XSCRT/ExtendedTypeInfo.hpp"
namespace XSCRT
{
namespace Traversal
{
template<typename B>
class TraverserBase
{
protected:
virtual ~TraverserBase () = default;
//@@ VC6
public:
virtual void trampoline (B& n) = 0;
virtual void trampoline (B const& n) = 0;
};
template <typename B>
class DispatcherBase
{
public:
virtual ~DispatcherBase () = default;
virtual void dispatch (B& n);
virtual void dispatch (B const& n);
void
map (TypeId id, TraverserBase<B>& t)
{
//@@ VC6
Traversers& traversers = traversal_map_[id];
traversers.push_back (&t);
}
public:
typedef std::vector<TraverserBase<B>*> Traversers;
typedef std::map<TypeId, Traversers> TraversalMap;
typedef typename TraversalMap::const_iterator Iterator;
Iterator
begin () const
{
return traversal_map_.begin ();
}
Iterator
end () const
{
return traversal_map_.end ();
}
private:
struct TypeInfoComparator
{
bool
operator () (ExtendedTypeInfo const& x,
ExtendedTypeInfo const& y) const
{
return x.type_id () < y.type_id ();
}
};
typedef std::map<ExtendedTypeInfo, unsigned long, TypeInfoComparator> LevelMap;
typedef std::set<ExtendedTypeInfo, TypeInfoComparator> TypeInfoSet;
static unsigned long
compute_levels (ExtendedTypeInfo const& ti,
unsigned long cur,
LevelMap& map);
static void
flatten_tree (ExtendedTypeInfo const& ti, TypeInfoSet& set);
private:
TraversalMap traversal_map_;
};
template <typename B>
class Dispatcher : public virtual DispatcherBase<B>
{
public:
Dispatcher ()
: merge_ (true)
{
}
void
traverser (DispatcherBase<B>& d)
{
for (typename DispatcherBase<B>::Iterator
i (d.begin ()), end (d.end ());
i != end; ++i)
{
for (typename DispatcherBase<B>::Traversers::const_iterator
t (i->second.begin ()), end (i->second.end ());
t != end; ++t)
{
dispatcher_.map (i->first, **t);
}
}
}
public:
virtual void
dispatch (B& n)
{
merge ();
dispatcher_.dispatch (n);
}
virtual void
dispatch (B const& n)
{
merge ();
dispatcher_.dispatch (n);
}
using DispatcherBase<B>::begin;
using DispatcherBase<B>::end;
private:
void
merge ()
{
if (merge_)
{
for (typename DispatcherBase<B>::Iterator
i (begin ()), e (end ()); i != e; ++i)
{
for (typename DispatcherBase<B>::Traversers::const_iterator
t (i->second.begin ()), e (i->second.end ()); t != e; ++t)
{
dispatcher_.map (i->first, **t);
}
}
merge_ = false;
}
}
protected:
template <typename X, typename A, typename I>
void
iterate_and_dispatch (I begin, I end, X& x, void (X::*next)(A&), A& a)
{
for (; begin != end;)
{
dispatch (*begin);
if (++begin != end) (x.*next) (a);
}
}
private:
bool merge_;
DispatcherBase<B> dispatcher_;
};
template <typename T, typename B>
struct Traverser : TraverserBase<B>, virtual Dispatcher<B>
{
typedef T Type;
Traverser ()
{
DispatcherBase<B>::map (typeid (Type), *this);
}
virtual void
traverse (Type&)
{
abort ();
}
virtual void
traverse (Type const&)
{
abort ();
}
protected:
virtual void
trampoline (B& n)
{
traverse (dynamic_cast<Type&> (n));
}
virtual void
trampoline (B const& n)
{
traverse (dynamic_cast<Type const&> (n));
}
};
}
}
#include <ace/XML_Utils/XSCRT/Traversal.tpp>
#endif // XSCRT_TRAVERSAL_HPP
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