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// file : odb/session.txx
// author : Boris Kolpackov <boris@codesynthesis.com>
// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <odb/pointer-traits.hxx>
namespace odb
{
template <typename T>
typename session::object_position<T> session::
insert (database_type& db,
const typename object_traits<T>::id_type& id,
const typename object_traits<T>::pointer_type& obj)
{
// T can be const T while object_type will always be T.
//
typedef typename object_traits<T>::object_type object_type;
typedef odb::object_traits<object_type> object_traits;
typedef typename odb::object_traits<T>::pointer_type pointer_type;
typedef odb::pointer_traits<pointer_type> pointer_traits;
type_map& tm (db_map_[&db]);
details::shared_ptr<object_map_base>& pom (tm[&typeid (object_type)]);
if (!pom)
pom.reset (new (details::shared) object_map<object_type>);
object_map<object_type>& om (
static_cast<object_map<object_type>&> (*pom));
typename object_map<object_type>::value_type vt (
id, object_pointers<object_type> ());
vt.second.set (obj);
std::pair<typename object_map<object_type>::iterator, bool> r (
om.insert (vt));
// In what situation may we possibly attempt to reinsert the object?
// For example, when the user loads the same object in to different
// instances (i.e., load into a pre-allocated object). In this case
// we should probably update our entries accordingly.
//
if (!r.second)
r.first->second.set (obj);
return object_position<T> (om, r.first);
}
template <typename T>
typename object_traits<T>::pointer_type session::
find (database_type& db, const typename object_traits<T>::id_type& id) const
{
// T can be const T while object_type will always be T.
//
typedef typename object_traits<T>::object_type object_type;
typedef typename object_traits<T>::pointer_type pointer_type;
database_map::const_iterator di (db_map_.find (&db));
if (di == db_map_.end ())
return pointer_type ();
const type_map& tm (di->second);
type_map::const_iterator ti (tm.find (&typeid (object_type)));
if (ti == tm.end ())
return pointer_type ();
const object_map<object_type>& om (
static_cast<const object_map<object_type>&> (*ti->second));
typename object_map<object_type>::const_iterator oi (om.find (id));
if (oi == om.end ())
return pointer_type ();
pointer_type r;
oi->second.get (r);
return r;
}
template <typename T>
void session::
erase (database_type& db, const typename object_traits<T>::id_type& id)
{
// T can be const T while object_type will always be T.
//
typedef typename object_traits<T>::object_type object_type;
database_map::iterator di (db_map_.find (&db));
if (di == db_map_.end ())
return;
type_map& tm (di->second);
type_map::iterator ti (tm.find (&typeid (object_type)));
if (ti == tm.end ())
return;
object_map<object_type>& om (
static_cast<object_map<object_type>&> (*ti->second));
typename object_map<object_type>::iterator oi (om.find (id));
if (oi == om.end ())
return;
om.erase (oi);
if (om.empty ())
tm.erase (ti);
if (tm.empty ())
db_map_.erase (di);
}
}
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