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# (c) Sound Object Logic 2000-2001
use strict;
use Tangram::Coll;
package Tangram::AbstractArray;
use vars qw(@ISA);
@ISA = qw( Tangram::Coll );
use Carp;
sub demand
{
my ($self, $def, $storage, $obj, $member, $class) = @_;
print $Tangram::TRACE "loading $member\n" if $Tangram::TRACE;
my (@coll, @lost);
if (my $prefetch = $storage->{PREFETCH}{$class}{$member}{$storage->export_object($obj)})
{
@coll = @$prefetch;
}
else
{
my $cursor = $self->cursor($def, $storage, $obj, $member);
for (my $item = $cursor->select(); $item; $item = $cursor->next)
{
my $slot = shift @{ $cursor->{-residue} };
if (defined $slot) {
$coll[$slot] = $item;
} else {
warn "object ".$storage->id($item)." has no slot in array ".$storage->id($obj)."/$member!";
push @lost, $item
}
}
# last-ditch effort to automatically DTRT
if (@lost) {
foreach(@coll) {
if (!defined $_) {
$_ = shift @lost;
}
last unless @lost;
}
push @coll, @lost;
}
}
$self->set_load_state($storage, $obj, $member, [ map { $_ && $storage->id($_) } @coll ]);
return \@coll;
}
sub get_export_cols
{
return (); # arrays are not stored on object's table
}
sub save_content
{
my ($obj, $field, $context) = @_;
# has collection been loaded? if not, then it hasn't been modified
return if tied $obj->{$field};
my $storage = $context->{storage};
foreach my $item (@{ $obj->{$field} }) {
$storage->insert($item)
unless $storage->id($item);
}
}
sub deep_save_content
{
my ($obj, $field, $context) = @_;
# has collection been loaded? if not, then it hasn't been modified
return if tied $obj->{$field};
my $storage = $context->{storage};
foreach my $item (@{$obj->{$field}}) {
$storage->_save($item, $context->{SAVING});
}
}
sub check_content
{
my ($obj, $field, $coll, $class) = @_;
foreach my $item ($obj->{$field}) {
Tangram::Coll::bad_type($obj, $field, $class, $item)
unless $item->isa($class);
}
}
sub get_exporter
{
my ($self, $context) = @_;
my $save_content = $self->{deep_update} ? \&deep_save_content : \&save_content;
my $field = $self->{name};
return sub {
my ($obj, $context) = @_;
$save_content->($obj, $self->{name}, $context);
$context->{storage}->defer(sub { $self->defered_save(shift, $obj, $field, $self) } );
();
}
}
sub defered_save
{
use integer;
my ($self, $storage, $obj, $field, $def) = @_;
return if tied $obj->{$field}; # collection has not been loaded, thus not modified
my $coll_id = $storage->id($obj);
my ($ne, $modify, $add, $remove) =
$self->get_save_closures($storage, $obj, $def, $storage->id($obj));
my $new_state = $obj->{$field} || [];
my $new_size = @$new_state;
my $old_state = $self->get_load_state($storage, $obj, $field) || [];
my $old_size = @$old_state;
my ($common, $changed) = Tangram::Coll::array_diff($new_state, $old_state, $ne);
for my $slot (@$changed)
{
$modify->($slot, $new_state->[$slot], $old_state->[$slot]);
}
for my $slot ($old_size .. ($new_size-1))
{
$add->($slot, $new_state->[$slot]);
}
if ($old_size > $new_size)
{
$remove->($new_size, $old_size);
}
$self->set_load_state($storage, $obj, $field, [ @$new_state ] );
$storage->tx_on_rollback( sub { $self->set_load_state($storage, $obj, $field, $old_state) } );
}
1;
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