/usr/include/odb/pgsql/polymorphic-object-result.txx is in libodb-pgsql-dev 2.4.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#include <cassert>
#include <odb/callback.hxx>
#include <odb/exceptions.hxx> // object_not_persistent
#include <odb/pgsql/polymorphic-object-statements.hxx>
namespace odb
{
namespace pgsql
{
template <typename T>
polymorphic_object_result_impl<T>::
~polymorphic_object_result_impl ()
{
if (!this->end_)
statement_->free_result ();
}
template <typename T>
void polymorphic_object_result_impl<T>::
invalidate ()
{
if (!this->end_)
{
statement_->free_result ();
this->end_ = true;
}
statement_.reset ();
}
template <typename T>
polymorphic_object_result_impl<T>::
polymorphic_object_result_impl (const query_base&,
details::shared_ptr<select_statement> st,
statements_type& sts,
const schema_version_migration* svm)
: base_type (sts.connection ()),
statement_ (st),
statements_ (sts),
tc_ (svm),
count_ (0)
{
}
template <typename T>
void polymorphic_object_result_impl<T>::
load (object_type* pobj, bool fetch)
{
if (fetch)
load_image ();
typename statements_type::root_statements_type& rsts (
statements_.root_statements ());
// This is a top-level call so the statements cannot be locked.
//
assert (!rsts.locked ());
typename statements_type::auto_lock l (rsts);
typename object_traits::image_type& i (statements_.image ());
typename root_traits::image_type& ri (rsts.image ());
id_type id (root_traits::id (ri));
// Determine this object's dynamic type.
//
typedef typename root_traits::info_type info_type;
discriminator_type d (root_traits::discriminator (ri));
discriminator_type disc (d);
// Use the polymorphic_info() helper to get concrete_info if
// object_type is concrete and NULL if it is abstract.
//
const info_type* spi (polymorphic_info (object_traits::info));
const info_type& pi (
spi != 0 && spi->discriminator == d
? *spi
: root_traits::map->find (d));
typedef typename root_traits::pointer_type root_pointer_type;
typedef typename root_traits::pointer_traits root_pointer_traits;
typename object_traits::pointer_cache_traits::insert_guard ig;
if (pobj == 0)
{
// Need to create a new instance of the dynamic type.
//
root_pointer_type rp (pi.create ());
pointer_type p (
root_pointer_traits::template static_pointer_cast<object_type> (rp));
// Insert it as a root pointer (for non-unique pointers, rp should
// still be valid and for unique pointers this is a no-op).
//
ig.reset (
object_traits::pointer_cache_traits::insert (this->db_, id, rp));
pobj = &pointer_traits::get_ref (p);
current (p);
}
else
{
// We are loading into an existing instance. If the static and
// dynamic types differ, then make sure the instance is at least
// of the dynamic type.
//
if (&pi != &object_traits::info)
{
const info_type& dpi (root_traits::map->find (typeid (*pobj)));
if (&dpi != &pi && dpi.derived (pi))
throw object_not_persistent (); // @@ type_mismatch ?
}
}
callback_event ce (callback_event::pre_load);
pi.dispatch (info_type::call_callback, this->db_, pobj, &ce);
tc_.init (*pobj, i, &this->db_);
// Initialize the id image and binding and load the rest of the object
// (containers, dynamic part, etc).
//
typename object_traits::id_image_type& idi (statements_.id_image ());
root_traits::init (idi, id);
binding& idb (statements_.id_image_binding ());
if (idi.version != statements_.id_image_version () || idb.version == 0)
{
object_traits::bind (idb.bind, idi);
statements_.id_image_version (idi.version);
idb.version++;
}
tc_.load_ (statements_, *pobj, false);
// Load the dynamic part of the object unless static and dynamic
// types are the same.
//
if (&pi != &object_traits::info)
{
std::size_t d (object_traits::depth);
pi.dispatch (info_type::call_load, this->db_, pobj, &d);
};
rsts.load_delayed (tc_.version ());
l.unlock ();
ce = callback_event::post_load;
pi.dispatch (info_type::call_callback, this->db_, pobj, &ce);
object_traits::pointer_cache_traits::load (ig.position ());
ig.release ();
}
template <typename T>
typename polymorphic_object_result_impl<T>::id_type
polymorphic_object_result_impl<T>::
load_id ()
{
load_image ();
return root_traits::id (statements_.root_statements ().image ());
}
template <typename T>
typename polymorphic_object_result_impl<T>::discriminator_type
polymorphic_object_result_impl<T>::
load_discriminator ()
{
load_image ();
return root_traits::discriminator (
statements_.root_statements ().image ());
}
template <typename T>
void polymorphic_object_result_impl<T>::
next ()
{
this->current (pointer_type ());
if (statement_->next ())
count_++;
else
{
statement_->free_result ();
this->end_ = true;
}
}
template <typename T, typename R>
struct polymorphic_image_rebind
{
// Derived type version.
//
typedef object_traits_impl<T, id_pgsql> traits;
static bool
rebind (typename traits::statements_type& sts,
const schema_version_migration* svm)
{
typename traits::image_type& im (sts.image ());
if (traits::check_version (sts.select_image_versions (), im))
{
binding& b (sts.select_image_binding (traits::depth));
object_traits_calls<T> tc (svm);
tc.bind (b.bind, 0, 0, im, statement_select);
traits::update_version (
sts.select_image_versions (), im, sts.select_image_bindings ());
return true;
}
return false;
}
};
template <typename R>
struct polymorphic_image_rebind<R, R>
{
// Root type version.
//
typedef object_traits_impl<R, id_pgsql> traits;
static bool
rebind (typename traits::statements_type& sts,
const schema_version_migration* svm)
{
typename traits::image_type& im (sts.image ());
if (im.version != sts.select_image_version ())
{
binding& b (sts.select_image_binding ());
object_traits_calls<R> tc (svm);
tc.bind (b.bind, im, statement_select);
sts.select_image_version (im.version);
b.version++;
return true;
}
return false;
}
};
template <typename T>
void polymorphic_object_result_impl<T>::
load_image ()
{
typedef polymorphic_image_rebind<object_type, root_type> image_rebind;
// The image can grow between calls to load() as a result of other
// statements execution.
//
image_rebind::rebind (statements_, tc_.version ());
select_statement::result r (statement_->load ());
if (r == select_statement::truncated)
{
typename object_traits::image_type& im (statements_.image ());
if (tc_.grow (im, statements_.select_image_truncated ()))
im.version++;
if (image_rebind::rebind (statements_, tc_.version ()))
statement_->reload ();
}
}
template <typename T>
void polymorphic_object_result_impl<T>::
cache ()
{
}
template <typename T>
std::size_t polymorphic_object_result_impl<T>::
size ()
{
return this->end_ ? count_ : statement_->result_size ();
}
}
}
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