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package MooseX::ABC::Trait::Class;
use Moose::Role;
# ABSTRACT: 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 is_abstract => (
is => 'rw',
isa => 'Bool',
default => 0,
);
has required_methods => (
traits => ['Array'],
is => 'ro',
isa => 'ArrayRef[Str]',
default => sub { [] },
auto_deref => 1,
handles => {
add_required_method => 'push',
has_required_methods => 'count',
},
);
after _superclasses_updated => sub {
my $self = shift;
return if $self->is_abstract;
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');
next unless $super_meta->is_abstract;
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->is_abstract) {
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')
&& $constructor->get_original_method == Class::MOP::class_of('Moose::Object')->get_method('new')) {
push @options, replace_constructor => 1;
}
# if our parent has been inlined and we are not abstract, then it's
# safe to inline ourselves
elsif ($constructor->isa('Moose::Meta::Method::Constructor')) {
push @options, replace_constructor => 1;
}
return @options;
};
no Moose::Role;
1;
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