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package MooseX::ABC::Trait::Class;
use Moose::Role;
use MooseX::AttributeHelpers;
=head1 NAME
MooseX::ABC::Trait::Class - metaclass trait for L<MooseX::ABC>
=head1 DESCRIPTION
This is a metaclass trait for L<MooseX::ABC> which implements the behavior of
dying if a subclass doesn't implement the required methods.
=cut
has required_methods => (
metaclass => 'Collection::Array',
is => 'ro',
isa => 'ArrayRef[Str]',
default => sub { [] },
auto_deref => 1,
provides => {
push => 'add_required_method',
empty => 'has_required_methods',
},
);
after _superclasses_updated => sub {
my $self = shift;
my @supers = $self->linearized_isa;
shift @supers;
for my $superclass (@supers) {
my $super_meta = Class::MOP::class_of($superclass);
next unless $super_meta->meta->can('does_role')
&& $super_meta->meta->does_role('MooseX::ABC::Trait::Class');
for my $method ($super_meta->required_methods) {
if (!$self->find_method_by_name($method)) {
my $classname = $self->name;
$self->throw_error(
"$superclass requires $classname to implement $method"
);
}
}
}
};
around _immutable_options => sub {
my $orig = shift;
my $self = shift;
my @options = $self->$orig(@_);
my $constructor = $self->find_method_by_name('new');
if ($self->has_required_methods) {
push @options, inline_constructor => 0;
}
# we know that the base class has at least our base class role applied,
# so it's safe to replace it if there is only one wrapper.
elsif ($constructor->isa('Class::MOP::Method::Wrapped')
&& $constructor->get_original_method == Class::MOP::class_of('Moose::Object')->get_method('new')) {
push @options, replace_constructor => 1;
}
return @options;
};
no Moose::Role;
=head1 SUPPORT
You can find this documentation for this module with the perldoc command.
perldoc MooseX::ABC
You can also look for information at:
=over 4
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/MooseX-ABC>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/MooseX-ABC>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=MooseX-ABC>
=item * Search CPAN
L<http://search.cpan.org/dist/MooseX-ABC>
=back
=head1 AUTHOR
Jesse Luehrs <doy at tozt dot net>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2009 by Jesse Luehrs.
This is free software; you can redistribute it and/or modify it under
the same terms as perl itself.
=cut
1;
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