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// file : odb/cache-traits.hxx
// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_CACHE_TRAITS_HXX
#define ODB_CACHE_TRAITS_HXX
#include <odb/pre.hxx>
#include <odb/traits.hxx>
#include <odb/forward.hxx>
#include <odb/session.hxx>
#include <odb/pointer-traits.hxx>
namespace odb
{
// Caching traits for objects passed by pointer.
//
template <typename P, typename ID, pointer_kind kind>
struct pointer_cache_traits_impl;
template <typename P>
struct pointer_cache_traits: pointer_cache_traits_impl<
P,
typename object_traits<typename pointer_traits<P>::element_type>::id_type,
pointer_traits<P>::kind>
{
};
template <typename P, typename ID, pointer_kind kind>
struct pointer_cache_traits_impl
{
typedef P pointer_type;
typedef odb::pointer_traits<pointer_type> pointer_traits;
typedef typename pointer_traits::element_type element_type;
// element_type can be const while object_type is always non-const.
//
typedef typename object_traits<element_type>::object_type object_type;
typedef typename object_traits<element_type>::id_type id_type;
typedef session::object_position<object_type> position_type;
struct insert_guard
{
insert_guard (const position_type& pos): pos_ (pos) {}
~insert_guard () {erase (pos_);}
position_type
position () const {return pos_;}
void
release () {pos_.map_ = 0;}
private:
position_type pos_;
};
// We need the insert() overload with explicit id to handle self-
// references. In such cases the object is not yet loaded and the
// id member does not contain the correct id.
//
// Qualify the database type to resolve a phony ambiguity in VC 10.
//
static position_type
insert (odb::database& db, const id_type& id, const pointer_type& p)
{
if (session::has_current ())
{
// Cast away constness if any.
//
return session::current ().insert<object_type> (
db, id, pointer_traits::cast (p));
}
else
return position_type ();
}
static position_type
insert (odb::database& db, const pointer_type& p)
{
const id_type& id (
object_traits<object_type>::id (
pointer_traits::get_ref (p)));
return insert (db, id, p);
}
static pointer_type
find (odb::database& db, const id_type& id)
{
if (session::has_current ())
return session::current ().find<object_type> (db, id);
else
return pointer_type ();
}
static void
erase (odb::database& db, const id_type& id)
{
if (session::has_current ())
session::current ().erase<object_type> (db, id);
}
static void
erase (const position_type& p)
{
if (p.map_ != 0)
session::current ().erase<object_type> (p);
}
};
template <typename P, pointer_kind kind>
struct pointer_cache_traits_impl<P, void, kind>
{
typedef P pointer_type;
struct position_type {};
static position_type
insert (odb::database&, const pointer_type&)
{
return position_type ();
}
};
// Unique pointers don't work with the object cache.
//
template <typename P, typename ID>
struct pointer_cache_traits_impl<P, ID, pk_unique>
{
typedef P pointer_type;
typedef typename pointer_traits<pointer_type>::element_type element_type;
typedef typename object_traits<element_type>::id_type id_type;
struct position_type {};
struct insert_guard
{
insert_guard (const position_type&) {}
position_type
position () const {return position_type ();}
void
release () {}
};
static position_type
insert (odb::database&, const id_type&, const pointer_type&)
{
return position_type ();
}
static position_type
insert (odb::database&, const pointer_type&)
{
return position_type ();
}
static pointer_type
find (odb::database&, const id_type&) { return pointer_type (); }
static void
erase (odb::database&, const id_type&) {}
static void
erase (const position_type&) {}
};
template <typename P>
struct pointer_cache_traits_impl<P, void, pk_unique>
{
typedef P pointer_type;
struct position_type {};
static position_type
insert (odb::database&, const pointer_type&)
{
return position_type ();
}
};
// Caching traits for objects passed by reference. Only if the object
// pointer kind is raw do we add the object to the session.
//
template <typename T, typename ID, pointer_kind kind>
struct reference_cache_traits_impl;
template <typename T>
struct reference_cache_traits: reference_cache_traits_impl<
T,
typename object_traits<T>::id_type,
pointer_traits<typename object_traits<T>::pointer_type>::kind>
{
};
template <typename T, typename ID, pointer_kind kind>
struct reference_cache_traits_impl
{
typedef T element_type;
typedef typename object_traits<element_type>::pointer_type pointer_type;
typedef typename object_traits<element_type>::id_type id_type;
typedef
typename pointer_cache_traits<pointer_type>::position_type
position_type;
struct insert_guard
{
insert_guard (const position_type&) {}
position_type
position () const {return position_type ();}
void
release () {}
};
static position_type
insert (odb::database&, const id_type&, element_type&)
{
return position_type ();
}
static position_type
insert (odb::database&, element_type&)
{
return position_type ();
}
};
template <typename T, pointer_kind kind>
struct reference_cache_traits_impl<T, void, kind>
{
typedef T element_type;
struct position_type {};
static position_type
insert (odb::database&, element_type&)
{
return position_type ();
}
};
template <typename T, typename ID>
struct reference_cache_traits_impl<T, ID, pk_raw>
{
typedef T element_type;
typedef typename object_traits<element_type>::pointer_type pointer_type;
typedef typename object_traits<element_type>::id_type id_type;
typedef
typename pointer_cache_traits<pointer_type>::position_type
position_type;
typedef
typename pointer_cache_traits<pointer_type>::insert_guard
insert_guard;
static position_type
insert (odb::database& db, const id_type& id, element_type& obj)
{
pointer_type p (&obj);
return pointer_cache_traits<pointer_type>::insert (db, id, p);
}
static position_type
insert (odb::database& db, element_type& obj)
{
pointer_type p (&obj);
return pointer_cache_traits<pointer_type>::insert (db, p);
}
};
template <typename T>
struct reference_cache_traits_impl<T, void, pk_raw>
{
typedef T element_type;
struct position_type {};
static position_type
insert (odb::database&, element_type&)
{
return position_type ();
}
};
}
#include <odb/post.hxx>
#endif // ODB_CACHE_TRAITS_HXX
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