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1 | |
2 | package MooseX::AttributeHelpers::Counter; |
3 | use Moose; |
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4 | |
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5 | our $VERSION = '0.02'; |
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6 | our $AUTHORITY = 'cpan:STEVAN'; |
7 | |
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8 | use MooseX::AttributeHelpers::MethodProvider::Counter; |
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9 | |
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10 | extends 'MooseX::AttributeHelpers::Base'; |
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11 | |
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12 | has '+method_provider' => ( |
13 | default => 'MooseX::AttributeHelpers::MethodProvider::Counter' |
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14 | ); |
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15 | |
16 | sub helper_type { 'Num' } |
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17 | |
18 | before 'process_options_for_provides' => sub { |
19 | my ($self, $options, $name) = @_; |
20 | |
21 | # Set some default attribute options here unless already defined |
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22 | if (my $type = $self->helper_type && !exists $options->{isa}){ |
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23 | $options->{isa} = $self->helper_type; |
24 | } |
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25 | |
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26 | $options->{is} = 'ro' unless exists $options->{is}; |
27 | $options->{default} = 0 unless exists $options->{default}; |
28 | }; |
29 | |
30 | after 'check_provides_values' => sub { |
31 | my $self = shift; |
32 | my $provides = $self->provides; |
33 | |
34 | unless (scalar keys %$provides) { |
35 | my $method_constructors = $self->method_constructors; |
36 | my $attr_name = $self->name; |
37 | |
38 | foreach my $method (keys %$method_constructors) { |
39 | $provides->{$method} = ($method . '_' . $attr_name); |
40 | } |
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41 | } |
42 | }; |
43 | |
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44 | no Moose; |
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45 | |
46 | # register the alias ... |
47 | package Moose::Meta::Attribute::Custom::Counter; |
48 | sub register_implementation { 'MooseX::AttributeHelpers::Counter' } |
49 | |
50 | 1; |
51 | |
52 | __END__ |
53 | |
54 | =pod |
55 | |
56 | =head1 NAME |
57 | |
58 | MooseX::AttributeHelpers::Counter |
59 | |
60 | =head1 SYNOPSIS |
61 | |
62 | package MyHomePage; |
63 | use Moose; |
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64 | use MooseX::AttributeHelpers; |
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65 | |
66 | has 'counter' => ( |
67 | metaclass => 'Counter', |
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68 | is => 'ro', |
69 | isa => 'Num', |
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70 | default => sub { 0 }, |
71 | provides => { |
72 | inc => 'inc_counter', |
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73 | dec => 'dec_counter', |
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74 | reset => 'reset_counter', |
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75 | } |
76 | ); |
77 | |
78 | my $page = MyHomePage->new(); |
79 | $page->inc_counter; # same as $page->counter($page->counter + 1); |
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80 | $page->dec_counter; # same as $page->counter($page->counter - 1); |
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81 | |
82 | =head1 DESCRIPTION |
83 | |
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84 | This module provides a simple counter attribute, which can be |
85 | incremented and decremeneted. |
86 | |
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87 | If your attribute definition does not include any of I<is>, I<isa>, |
88 | I<default> or I<provides> but does use the C<Counter> metaclass, |
89 | then this module applies defaults as in the L</SYNOPSIS> |
90 | above. This allows for a very basic counter definition: |
91 | |
92 | has 'foo' => (metaclass => 'Counter'); |
93 | $obj->inc_foo; |
94 | |
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95 | =head1 METHODS |
96 | |
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97 | =over 4 |
98 | |
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99 | =item B<meta> |
100 | |
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101 | =item B<method_provider> |
102 | |
103 | =item B<has_method_provider> |
104 | |
105 | =item B<helper_type> |
106 | |
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107 | =item B<process_options_for_provides> |
108 | |
109 | Run before its superclass method. |
110 | |
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111 | =item B<check_provides_values> |
112 | |
113 | Run after its superclass method. |
114 | |
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115 | =back |
116 | |
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117 | =head1 PROVIDED METHODS |
118 | |
119 | It is important to note that all those methods do in place |
120 | modification of the value stored in the attribute. |
121 | |
122 | =over 4 |
123 | |
124 | =item I<inc> |
125 | |
126 | Increments the value stored in this slot by 1. |
127 | |
128 | =item I<dec> |
129 | |
130 | Decrements the value stored in this slot by 1. |
131 | |
132 | =item I<reset> |
133 | |
134 | Resets the value stored in this slot to it's default value. |
135 | |
136 | =back |
137 | |
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138 | =head1 BUGS |
139 | |
140 | All complex software has bugs lurking in it, and this module is no |
141 | exception. If you find a bug please either email me, or add the bug |
142 | to cpan-RT. |
143 | |
144 | =head1 AUTHOR |
145 | |
146 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
147 | |
148 | =head1 COPYRIGHT AND LICENSE |
149 | |
150 | Copyright 2007 by Infinity Interactive, Inc. |
151 | |
152 | L<http://www.iinteractive.com> |
153 | |
154 | This library is free software; you can redistribute it and/or modify |
155 | it under the same terms as Perl itself. |
156 | |
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157 | =cut |