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8a44b0a6 |
1 | package MooseX::ClassAttribute::Trait::CompositeRole; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use Moose::Util::MetaRole; |
7 | use Moose::Util qw(does_role); |
8 | |
9 | use namespace::autoclean; |
10 | use Moose::Role; |
11 | with 'MooseX::ClassAttribute::Trait::Role'; |
12 | |
13 | sub _merge_class_attributes { |
14 | my $self = shift; |
15 | |
16 | my @all_attributes; |
17 | foreach my $role (@{ $self->get_roles }) { |
18 | if (does_role($role, 'MooseX::ClassAttribute::Trait::Role')) { |
19 | push @all_attributes, |
20 | map { $role->get_class_attribute($_) } |
21 | $role->get_class_attribute_list; |
22 | } |
23 | } |
24 | |
25 | my %seen; |
26 | |
27 | foreach my $attribute (@all_attributes) { |
28 | my $name = $attribute->name; |
29 | if (exists $seen{$name}) { |
30 | next if $seen{$name} == $attribute; |
31 | |
32 | require Moose; |
33 | Moose->throw_error( "Role '" |
34 | . $self->name() |
35 | . "' has encountered a class attribute conflict " |
36 | . "during composition. This is fatal error and cannot be disambiguated." |
37 | ); |
38 | } |
39 | $seen{$name} = $attribute; |
40 | } |
41 | foreach my $attribute (@all_attributes) { |
42 | $self->add_class_attribute( $attribute->clone() ); |
43 | } |
44 | |
45 | return keys %seen; |
46 | } |
47 | |
48 | around apply_params => sub { |
49 | my ($orig, $self, @args) = @_; |
50 | |
51 | my $metarole = Moose::Util::MetaRole::apply_metaroles( |
52 | for => $self->$orig(@args), |
53 | role_metaroles => { |
54 | application_to_class => |
55 | ['MooseX::ClassAttribute::Trait::Application::ToClass'], |
56 | application_to_role => |
57 | ['MooseX::ClassAttribute::Trait::Application::ToRole'], |
58 | }, |
59 | ); |
60 | $metarole->_merge_class_attributes; |
61 | return $metarole; |
62 | }; |
63 | |
64 | 1; |
65 | |
66 | # ABSTRACT: A trait that supports applying multiple roles at once |
67 | |
68 | __END__ |
69 | |
70 | =pod |
71 | |
72 | =head1 DESCRIPTION |
73 | |
74 | This trait is used to allow the application of multiple roles (one |
75 | or more of which contain class attributes) to a class or role. |
76 | |
77 | =head1 BUGS |
78 | |
79 | See L<MooseX::ClassAttribute> for details. |
80 | |
81 | =cut |