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// file : odb/polymorphic-info.hxx
// copyright : Copyright (c) 2005-2012 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_POLYMORPHIC_INFO_HXX
#define ODB_POLYMORPHIC_INFO_HXX
#include <odb/pre.hxx>
#include <odb/forward.hxx> // database
#include <odb/traits.hxx>
namespace odb
{
template <typename R>
struct polymorphic_abstract_info
{
polymorphic_abstract_info (const std::type_info& t,
const polymorphic_abstract_info* b)
: type (t), base (b) {}
bool
derived (const polymorphic_abstract_info& b) const
{
for (const polymorphic_abstract_info* p (base); p != 0; p = p->base)
if (&b == p)
return true;
return false;
}
public:
const std::type_info& type;
const polymorphic_abstract_info* base;
};
template <typename R>
struct polymorphic_concrete_info: polymorphic_abstract_info<R>
{
typedef R root_type;
typedef object_traits<root_type> root_traits;
typedef typename root_traits::id_type id_type;
typedef typename root_traits::pointer_type pointer_type;
typedef typename root_traits::discriminator_type discriminator_type;
enum call_type
{
call_callback, // arg points to callback event.
call_persist, // arg is not used.
call_update, // arg is not used.
call_find, // arg points to object id.
call_reload, // arg is not used.
call_load, // arg points to depth.
call_erase // arg points to object id.
};
typedef pointer_type (*create_function) ();
typedef bool (*dispatch_function) (
call_type, database&, const root_type*, const void* arg);
typedef void (*delayed_loader_function) (
database&, const id_type&, root_type&);
public:
polymorphic_concrete_info (const std::type_info& t,
const polymorphic_abstract_info<R>* b,
const discriminator_type& d,
create_function cf,
dispatch_function df,
delayed_loader_function dlf)
: polymorphic_abstract_info<R> (t, b),
discriminator (d),
create (cf), dispatch (df), delayed_loader (dlf)
{
}
public:
discriminator_type discriminator;
create_function create;
dispatch_function dispatch;
delayed_loader_function delayed_loader;
};
// Register concrete type T in the root's map.
//
template <typename T>
struct polymorphic_entry
{
typedef T object_type;
typedef odb::object_traits<object_type> object_traits;
typedef typename object_traits::root_type root_type;
typedef odb::object_traits<root_type> root_traits;
polymorphic_entry ();
~polymorphic_entry ();
};
// Helper functions that either return the concrete info or NULL
// depending on what kind of info we pass (used in query support).
//
template <typename R>
inline const polymorphic_concrete_info<R>*
polymorphic_info (const polymorphic_concrete_info<R>& i)
{
return &i;
}
template <typename R>
inline const polymorphic_concrete_info<R>*
polymorphic_info (const polymorphic_abstract_info<R>&)
{
return 0;
}
}
#include <odb/post.hxx>
#endif // ODB_POLYMORPHIC_INFO_HXX
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