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1 | package Class::MOP::Mixin::HasAttributes; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
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6 | our $VERSION = '1.11'; |
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7 | $VERSION = eval $VERSION; |
8 | our $AUTHORITY = 'cpan:STEVAN'; |
9 | |
10 | use Carp 'confess'; |
11 | use Scalar::Util 'blessed'; |
12 | |
13 | use base 'Class::MOP::Mixin'; |
14 | |
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15 | sub add_attribute { |
16 | my $self = shift; |
17 | |
18 | my $attribute |
19 | = blessed( $_[0] ) ? $_[0] : $self->attribute_metaclass->new(@_); |
20 | |
21 | ( $attribute->isa('Class::MOP::Mixin::AttributeCore') ) |
22 | || confess |
23 | "Your attribute must be an instance of Class::MOP::Mixin::AttributeCore (or a subclass)"; |
24 | |
25 | $self->_attach_attribute($attribute); |
26 | |
27 | my $attr_name = $attribute->name; |
28 | |
29 | $self->remove_attribute($attr_name) |
30 | if $self->has_attribute($attr_name); |
31 | |
32 | my $order = ( scalar keys %{ $self->_attribute_map } ); |
33 | $attribute->_set_insertion_order($order); |
34 | |
35 | $self->_attribute_map->{$attr_name} = $attribute; |
36 | |
37 | # This method is called to allow for installing accessors. Ideally, we'd |
38 | # use method overriding, but then the subclass would be responsible for |
39 | # making the attribute, which would end up with lots of code |
40 | # duplication. Even more ideally, we'd use augment/inner, but this is |
41 | # Class::MOP! |
42 | $self->_post_add_attribute($attribute) |
43 | if $self->can('_post_add_attribute'); |
44 | |
45 | return $attribute; |
46 | } |
47 | |
48 | sub has_attribute { |
49 | my ( $self, $attribute_name ) = @_; |
50 | |
51 | ( defined $attribute_name ) |
52 | || confess "You must define an attribute name"; |
53 | |
54 | exists $self->_attribute_map->{$attribute_name}; |
55 | } |
56 | |
57 | sub get_attribute { |
58 | my ( $self, $attribute_name ) = @_; |
59 | |
60 | ( defined $attribute_name ) |
61 | || confess "You must define an attribute name"; |
62 | |
63 | return $self->_attribute_map->{$attribute_name}; |
64 | } |
65 | |
66 | sub remove_attribute { |
67 | my ( $self, $attribute_name ) = @_; |
68 | |
69 | ( defined $attribute_name ) |
70 | || confess "You must define an attribute name"; |
71 | |
72 | my $removed_attribute = $self->_attribute_map->{$attribute_name}; |
73 | return unless defined $removed_attribute; |
74 | |
75 | delete $self->_attribute_map->{$attribute_name}; |
76 | |
77 | return $removed_attribute; |
78 | } |
79 | |
80 | sub get_attribute_list { |
81 | my $self = shift; |
82 | keys %{ $self->_attribute_map }; |
83 | } |
84 | |
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85 | sub _restore_metaattributes_from { |
86 | my $self = shift; |
87 | my ($old_meta) = @_; |
88 | |
89 | for my $attr (sort { $a->insertion_order <=> $b->insertion_order } |
90 | map { $old_meta->get_attribute($_) } |
91 | $old_meta->get_attribute_list) { |
92 | $attr->_make_compatible_with($self->attribute_metaclass); |
93 | $self->add_attribute($attr); |
94 | } |
95 | } |
96 | |
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97 | 1; |
98 | |
99 | __END__ |
100 | |
101 | =pod |
102 | |
103 | =head1 NAME |
104 | |
105 | Class::MOP::Mixin::HasMethods - Methods for metaclasses which have attributes |
106 | |
107 | =head1 DESCRIPTION |
108 | |
109 | This class implements methods for metaclasses which have attributes |
110 | (L<Class::MOP::Class> and L<Moose::Meta::Role>). See L<Class::MOP::Class> for |
111 | API details. |
112 | |
113 | =head1 AUTHORS |
114 | |
115 | Dave Rolsky E<lt>autarch@urth.orgE<gt> |
116 | |
117 | =head1 COPYRIGHT AND LICENSE |
118 | |
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119 | Copyright 2006-2010 by Infinity Interactive, Inc. |
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120 | |
121 | L<http://www.iinteractive.com> |
122 | |
123 | This library is free software; you can redistribute it and/or modify |
124 | it under the same terms as Perl itself. |
125 | |
126 | =cut |