use Moose;
has 'storage' => (
- is => 'rw',
- isa => 'HashRef',
+ is => 'rw',
+ isa => 'HashRef',
default => sub {{}}
);
-has 'object' => (
- is => 'rw',
- isa => 'Object',
-);
+has 'object' => (is => 'rw', isa => 'Object');
+has 'class' => (is => 'rw', isa => 'Str');
-sub BUILD {
- (shift)->collapse_object;
-}
+## this is the API used by other modules ...
sub collapse_object {
my $self = shift;
- $self->process_attributes;
+ $self->map_attributes('collapse_attribute');
+ $self->storage->{'__class__'} = $self->object->meta->name;
return $self->storage;
}
-sub extract_attributes {
- my $self = shift;
- return $self->object->meta->compute_all_applicable_attributes;
+sub expand_object {
+ my ($self, $data) = @_;
+ $self->map_attributes('expand_attribute', $data);
+ return $self->storage;
}
-sub process_attributes {
- my $self = shift;
- foreach my $attr ($self->extract_attributes) {
- next if $attr->name eq '_storage';
- $self->process_attribute($attr);
- }
+## this is the internal API ...
+
+sub collapse_attribute {
+ my ($self, $attr) = @_;
+ $self->storage->{$attr->name} = $self->collapse_attribute_value($attr) || return;
+}
+
+sub expand_attribute {
+ my ($self, $attr, $data) = @_;
+ $self->storage->{$attr->name} = $self->expand_attribute_value($attr, $data->{$attr->name}) || return;
}
-sub process_attribute {
+sub collapse_attribute_value {
my ($self, $attr) = @_;
- $self->storage->{$attr->name} = $self->collapse_attribute($attr);
+ my $value = $attr->get_value($self->object);
+ # TODO:
+ # we want to explicitly disallow
+ # cycles here, because the base
+ # storage engine does not support
+ # them
+ if (defined $value && $attr->has_type_constraint) {
+ my $type_converter = $self->match_type($attr->type_constraint);
+ (defined $type_converter)
+ || confess "Cannot convert " . $attr->type_constraint->name;
+ $value = $type_converter->{collapse}->($value);
+ }
+ return $value;
+}
+
+sub expand_attribute_value {
+ my ($self, $attr, $value) = @_;
+ # TODO:
+ # we need to check $value here to
+ # make sure that we do not have
+ # a cycle here.
+ if (defined $value && $attr->has_type_constraint) {
+ my $type_converter = $self->match_type($attr->type_constraint);
+ $value = $type_converter->{expand}->($value);
+ }
+ return $value;
+}
+
+# util methods ...
+
+sub map_attributes {
+ my ($self, $method_name, @args) = @_;
+ map {
+ $self->$method_name($_, @args)
+ } ($self->object || $self->class)->meta->compute_all_applicable_attributes;
}
my %TYPES = (
- 'Int' => sub { shift },
- 'Num' => sub { shift },
- 'Str' => sub { shift },
- 'ArrayRef' => sub { shift },
- 'HashRef' => sub { shift },
- 'GlobRef' => sub { confess "FOO" },
- 'CodeRef' => sub { confess "This should use B::Deparse" },
- 'Object' => sub {
- my $obj = shift;
- $obj || confess("Object Not Defined");
- ($obj->does('MooseX::Storage::Base'))
- || confess "Bad object";
- $obj->pack();
- }
+ 'Int' => { expand => sub { shift }, collapse => sub { shift } },
+ 'Num' => { expand => sub { shift }, collapse => sub { shift } },
+ 'Str' => { expand => sub { shift }, collapse => sub { shift } },
+ 'ArrayRef' => { expand => sub { shift }, collapse => sub { shift } },
+ 'HashRef' => { expand => sub { shift }, collapse => sub { shift } },
+ 'Object' => {
+ expand => sub {
+ my $data = shift;
+ (exists $data->{'__class__'})
+ || confess "Serialized item has no class marker";
+ $data->{'__class__'}->unpack($data);
+ },
+ collapse => sub {
+ my $obj = shift;
+ ($obj->can('does') && $obj->does('MooseX::Storage::Basic'))
+ || confess "Bad object ($obj) does not do MooseX::Storage::Base role";
+ $obj->pack();
+ },
+ }
);
sub match_type {
return $TYPES{$type}
if $type_constraint->is_subtype_of($type);
}
-}
+ # TODO:
+ # from here we can expand this to support the following:
+ # - if it is subtype of Ref
+ # -- if it is a subtype of Object
+ # --- treat it like an object
+ # -- else
+ # --- treat it like any other Ref
+ # - else
+ # -- if it is a subtype of Num or Str
+ # --- treat it like Num or Str
+ # -- else
+ # --- pass it on
+ # this should cover 80% of all use cases
-sub collapse_attribute {
- my ($self, $attr) = @_;
- my $value = $attr->get_value($self->object);
- if (defined $value && $attr->has_type_constraint) {
- my $type_converter = $self->match_type($attr->type_constraint);
- (defined $type_converter)
- || confess "Cannot convert " . $attr->type_constraint->name;
- $value = $type_converter->($value);
- }
- return $value;
+ # CHRIS: To cover the last 20% we need a way
+ # for people to extend this process.
+
+ # NOTE:
+ # if this method hasnt returned by now
+ # then we have no been able to find a
+ # type constraint handler to match
+ confess "Cannot handle type constraint (" . $type_constraint->name . ")";
}
1;
-__END__
\ No newline at end of file
+
+__END__
+
+=pod
+
+=head1 NAME
+
+MooseX::Storage::Engine
+
+=head1 SYNOPSIS
+
+=head1 DESCRIPTION
+
+=head1 METHODS
+
+=head2 Accessors
+
+=over 4
+
+=item B<class>
+
+=item B<object>
+
+=item B<storage>
+
+=back
+
+=head2 API
+
+=over 4
+
+=item B<expand_object>
+
+=item B<collapse_object>
+
+=back
+
+=head2 ...
+
+=over 4
+
+=item B<collapse_attribute>
+
+=item B<collapse_attribute_value>
+
+=item B<expand_attribute>
+
+=item B<expand_attribute_value>
+
+=item B<map_attributes>
+
+=item B<match_type>
+
+=back
+
+=head2 Introspection
+
+=over 4
+
+=item B<meta>
+
+=back
+
+=head1 BUGS
+
+All complex software has bugs lurking in it, and this module is no
+exception. If you find a bug please either email me, or add the bug
+to cpan-RT.
+
+=head1 AUTHOR
+
+Chris Prather E<lt>chris.prather@iinteractive.comE<gt>
+
+Stevan Little E<lt>stevan.little@iinteractive.comE<gt>
+
+=head1 COPYRIGHT AND LICENSE
+
+Copyright 2007 by Infinity Interactive, Inc.
+
+L<http://www.iinteractive.com>
+
+This library is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=cut
+
+
+
projects / gitmo/MooseX-Storage.git / blobdiff