make re-applying a role to an object instance a no-op. Previously, we ended up making...

[gitmo/Moose.git] / lib / Moose / Meta / Role / Application / ToInstance.pm

package Moose::Meta::Role::Application::ToInstance;

use strict;
use warnings;
use metaclass;

use Scalar::Util 'blessed';

our $VERSION   = '0.72';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';

use base 'Moose::Meta::Role::Application::ToClass';

__PACKAGE__->meta->add_attribute('rebless_params' => (
    reader  => 'rebless_params',
    default => sub { {} }
));

my %ANON_CLASSES;

sub apply {
    my ($self, $role, $object) = @_;

    return
        if $object->can('meta')
            && $object->meta->can('does_role')
            && $object->meta->does_role( $role->name );

    my $anon_role_key = (blessed($object) . $role->name);

    my $class;
    if (exists $ANON_CLASSES{$anon_role_key} && defined $ANON_CLASSES{$anon_role_key}) {
        $class = $ANON_CLASSES{$anon_role_key};
    }
    else {
        my $obj_meta = eval { $object->meta } || 'Moose::Meta::Class';
        $class = $obj_meta->create_anon_class(
            superclasses => [ blessed($object) ]
        );
        $ANON_CLASSES{$anon_role_key} = $class;
        $self->SUPER::apply($role, $class);
    }

    $class->rebless_instance($object, %{$self->rebless_params});
}

1;

__END__

=pod

=head1 NAME

Moose::Meta::Role::Application::ToInstance - Compose a role into an instance

=head1 DESCRIPTION

=head2 METHODS

=over 4

=item B<new>

=item B<meta>

=item B<apply>

=item B<rebless_params>

=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

Stevan Little E<lt>stevan@iinteractive.comE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2006-2009 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