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// file : odb/session.txx
// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
namespace odb
{
template <typename T>
typename session::cache_position<T> session::
cache_insert (database_type& db,
const typename object_traits<T>::id_type& id,
const typename object_traits<T>::pointer_type& obj)
{
type_map& tm (db_map_[&db]);
details::shared_ptr<object_map_base>& pom (tm[&typeid (T)]);
if (!pom)
pom.reset (new (details::shared) object_map<T>);
object_map<T>& om (static_cast<object_map<T>&> (*pom));
typename object_map<T>::value_type vt (id, obj);
std::pair<typename object_map<T>::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 two 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 = obj;
return cache_position<T> (om, r.first);
}
template <typename T>
typename object_traits<T>::pointer_type session::
cache_find (database_type& db,
const typename object_traits<T>::id_type& id) const
{
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 (T)));
if (ti == tm.end ())
return pointer_type ();
const object_map<T>& om (static_cast<const object_map<T>&> (*ti->second));
typename object_map<T>::const_iterator oi (om.find (id));
if (oi == om.end ())
return pointer_type ();
return oi->second;
}
template <typename T>
void session::
cache_erase (database_type& db, const typename object_traits<T>::id_type& id)
{
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 (T)));
if (ti == tm.end ())
return;
object_map<T>& om (static_cast<object_map<T>&> (*ti->second));
typename object_map<T>::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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