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