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1 | |
2 | package MooseX::AttributeHelpers::Counter; |
3 | use Moose; |
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4 | use Moose::Util::TypeConstraints; |
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5 | |
6 | our $VERSION = '0.01'; |
7 | our $AUTHORITY = 'cpan:STEVAN'; |
8 | |
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9 | extends 'MooseX::AttributeHelpers::Base'; |
10 | |
11 | has '+method_constructors' => ( |
12 | default => sub { |
13 | return +{ |
14 | inc => sub { |
15 | my $attr = shift; |
16 | return sub { $attr->set_value($_[0], $attr->get_value($_[0]) + 1) }; |
17 | }, |
18 | dec => sub { |
19 | my $attr = shift; |
20 | return sub { $attr->set_value($_[0], $attr->get_value($_[0]) - 1) }; |
21 | }, |
22 | } |
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23 | } |
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24 | ); |
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25 | |
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26 | sub _process_options_for_provides { |
27 | my ($self, $options) = @_; |
28 | (exists $options->{isa}) |
29 | || confess "You must define a type with the Counter metaclass"; |
30 | |
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31 | (find_type_constraint($options->{isa})->is_a_type_of('Num')) |
32 | || confess "The type constraint for a Counter ($options->{isa}) must be a subtype of Num"; |
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33 | } |
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34 | |
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35 | no Moose; |
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36 | no Moose::Util::TypeConstraints; |
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37 | |
38 | # register the alias ... |
39 | package Moose::Meta::Attribute::Custom::Counter; |
40 | sub register_implementation { 'MooseX::AttributeHelpers::Counter' } |
41 | |
42 | 1; |
43 | |
44 | __END__ |
45 | |
46 | =pod |
47 | |
48 | =head1 NAME |
49 | |
50 | MooseX::AttributeHelpers::Counter |
51 | |
52 | =head1 SYNOPSIS |
53 | |
54 | package MyHomePage; |
55 | use Moose; |
56 | |
57 | has 'counter' => ( |
58 | metaclass => 'Counter', |
59 | is => 'rw', |
60 | isa => 'Int', |
61 | default => sub { 0 }, |
62 | provides => { |
63 | inc => 'inc_counter', |
64 | } |
65 | ); |
66 | |
67 | my $page = MyHomePage->new(); |
68 | $page->inc_counter; # same as $page->counter($page->counter + 1); |
69 | |
70 | =head1 DESCRIPTION |
71 | |
72 | =head1 METHODS |
73 | |
74 | =head1 BUGS |
75 | |
76 | All complex software has bugs lurking in it, and this module is no |
77 | exception. If you find a bug please either email me, or add the bug |
78 | to cpan-RT. |
79 | |
80 | =head1 AUTHOR |
81 | |
82 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
83 | |
84 | =head1 COPYRIGHT AND LICENSE |
85 | |
86 | Copyright 2007 by Infinity Interactive, Inc. |
87 | |
88 | L<http://www.iinteractive.com> |
89 | |
90 | This library is free software; you can redistribute it and/or modify |
91 | it under the same terms as Perl itself. |
92 | |
93 | =cut |