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# (c) Sound Object Logic 2000-2001
use strict;
package Tangram::RefOnDemand;
sub TIESCALAR
{
my $pkg = shift;
return bless [ @_ ], $pkg;
}
sub FETCH
{
my $self = shift;
my ($storage, $id, $member, $refid) = @$self;
my $obj = $storage->{objects}{$id};
my $refobj = $storage->load($refid);
untie $obj->{$member};
$obj->{$member} = $refobj;
return $refobj;
}
sub STORE
{
my ($self, $val) = @_;
my ($storage, $id, $member, $refid) = @$self;
my $obj = $storage->{objects}{$id};
untie $obj->{$member};
return $obj->{$member} = $val;
}
sub id
{
my ($storage, $id, $member, $refid) = @{shift()};
$refid
}
use Tangram::Scalar;
package Tangram::Ref;
use base qw( Tangram::Scalar SelfLoader );
$Tangram::Schema::TYPES{ref} = Tangram::Ref->new;
sub field_reschema
{
my ($self, $field, $def) = @_;
$self->SUPER::field_reschema($field, $def);
die unless $field;
$def->{type_col} ||= "${field}_type";
}
sub get_export_cols
{
my ($self, $context) = @_;
return $context->{layout1} ? ( $self->{col} ) : ( $self->{col}, $self->{type_col} );
}
sub get_import_cols
{
my ($self, $context) = @_;
return $context->{layout1} ? ( $self->{col} ) : ( $self->{col}, $self->{type_col} );
}
sub get_exporter
{
my ($self, $context) = @_;
my $field = $self->{name};
my $table = $context->{class}{table};
my $deep_update = exists $self->{deep_update};
if ($context->{layout1}) {
return sub {
my ($obj, $context) = @_;
return undef unless exists $obj->{$field};
my $storage = $context->{storage};
my $tied = tied($obj->{$field});
return $tied->id if $tied;
my $ref = $obj->{$field};
return undef unless $ref;
my $id = $storage->id($obj);
if ($context->{SAVING}->includes($ref)) {
$storage->defer( sub
{
my $storage = shift;
# now that the object has been saved, we have an id for it
my $refid = $storage->id($ref);
# patch the column in the referant
$storage->sql_do( "UPDATE $table SET $self->{col} = $refid WHERE id = $id" );
} );
return undef;
}
$storage->_save($ref, $context->{SAVING})
if $deep_update;
return $storage->id($ref) || $storage->_insert($ref, $context->{SAVING});
}
}
return sub {
my ($obj, $context) = @_;
return (undef, undef) unless exists $obj->{$field};
my $storage = $context->{storage};
my $tied = tied($obj->{$field});
return $storage->split_id($tied->id) if $tied;
my $ref = $obj->{$field};
return (undef, undef) unless $ref;
my $exp_id = $storage->export_object($obj);
if ($context->{SAVING}->includes($ref)) {
$storage->defer( sub
{
my $storage = shift;
# now that the object has been saved, we have an id for it
my $ref_id = $storage->export_object($ref);
my $type_id = $storage->class_id(ref($ref));
# patch the column in the referant
$storage->sql_do( "UPDATE $table SET $self->{col} = $ref_id, $self->{type_col} = $type_id WHERE id = $exp_id" );
} );
return (undef, undef);
}
$storage->_save($ref, $context->{SAVING})
if $deep_update;
return $storage->split_id($storage->id($ref) || $storage->_insert($ref, $context->{SAVING}));
}
}
sub get_importer
{
my ($self, $context) = @_;
my $field = $self->{name};
return sub {
my ($obj, $row, $context) = @_;
my $storage = $context->{storage};
my $rid = shift @$row;
my $cid = shift @$row unless $context->{layout1};
if ($rid) {
tie $obj->{$field}, 'Tangram::RefOnDemand', $storage, $context->{id}, $field, $storage->combine_ids($rid, $cid);
} else {
$obj->{$field} = undef;
}
}
}
sub query_expr
{
my ($self, $obj, $memdefs, $tid, $storage) = @_;
return map { $self->expr("t$tid.$memdefs->{$_}{col}", $obj) } keys %$memdefs;
}
sub remote_expr
{
my ($self, $obj, $tid, $storage) = @_;
$self->expr("t$tid.$self->{col}", $obj);
}
sub refid
{
my ($storage, $obj, $member) = @_;
Carp::carp "Tangram::Ref::refid( \$storage, \$obj, \$member )" unless !$^W
&& eval { $storage->isa('Tangram::Storage') }
&& eval { $obj->isa('UNIVERSAL') }
&& !ref($member);
my $tied = tied($obj->{$member});
return $storage->id( $obj->{$member} ) unless $tied;
my ($storage_, $id_, $member_, $refid) = @$tied;
return $refid;
}
sub erase
{
my ($self, $storage, $obj, $members) = @_;
foreach my $member (keys %$members)
{
$storage->erase( $obj->{$member} )
if $members->{$member}{aggreg} && $obj->{$member};
}
}
sub DESTROY { }
use SelfLoader;
1;
__DATA__
sub Tangram::Ref::coldefs
{
my ($self, $cols, $members, $schema) = @_;
for my $def (values %$members) {
my $nullable = !exists($def->{null}) || $def->{null} ? " $schema->{sql}{default_null}" : '';
$cols->{ $def->{col} } = $schema->{sql}{id} . $nullable;
$cols->{ $def->{type_col} or die } = $schema->{sql}{cid} . $nullable;
}
}
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