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1 | |
2 | package Moose::AttributeHelpers::Trait::Counter; |
3 | use Moose::Role; |
4 | |
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5 | our $VERSION = '0.85'; |
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6 | $VERSION = eval $VERSION; |
7 | our $AUTHORITY = 'cpan:STEVAN'; |
8 | |
9 | use Moose::AttributeHelpers::MethodProvider::Counter; |
10 | |
11 | with 'Moose::AttributeHelpers::Trait::Base'; |
12 | |
13 | has 'method_provider' => ( |
14 | is => 'ro', |
15 | isa => 'ClassName', |
16 | predicate => 'has_method_provider', |
17 | default => 'Moose::AttributeHelpers::MethodProvider::Counter', |
18 | ); |
19 | |
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20 | sub _default_default { 0 } |
21 | sub _default_is { 'ro' } |
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22 | |
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23 | sub helper_type { 'Num' } |
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24 | |
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25 | after '_check_handles_values' => sub { |
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26 | my $self = shift; |
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27 | my $handles = $self->handles; |
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28 | |
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29 | unless ( scalar keys %$handles ) { |
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30 | my $method_constructors = $self->method_constructors; |
31 | my $attr_name = $self->name; |
32 | |
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33 | foreach my $method ( keys %$method_constructors ) { |
34 | $handles->{ $method . '_' . $attr_name } = $method; |
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35 | } |
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36 | |
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37 | $self->_set_handles($handles); |
38 | } |
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39 | }; |
40 | |
41 | no Moose::Role; |
42 | |
43 | # register the alias ... |
44 | package # hide me from search.cpan.org |
45 | Moose::Meta::Attribute::Custom::Trait::Counter; |
46 | sub register_implementation { 'Moose::AttributeHelpers::Trait::Counter' } |
47 | |
48 | 1; |
49 | |
50 | __END__ |
51 | |
52 | =pod |
53 | |
54 | =head1 NAME |
55 | |
56 | Moose::AttributeHelpers::Counter |
57 | |
58 | =head1 SYNOPSIS |
59 | |
60 | package MyHomePage; |
61 | use Moose; |
62 | use Moose::AttributeHelpers; |
63 | |
64 | has 'counter' => ( |
65 | metaclass => 'Counter', |
66 | is => 'ro', |
67 | isa => 'Num', |
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68 | default => 0, |
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69 | handles => { |
70 | inc_counter => 'inc', |
71 | dec_counter => 'dec', |
72 | reset_counter => 'reset', |
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73 | } |
74 | ); |
75 | |
76 | my $page = MyHomePage->new(); |
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77 | $page->inc_counter; # same as $page->counter( $page->counter + 1 ); |
78 | $page->dec_counter; # same as $page->counter( $page->counter - 1 ); |
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79 | |
80 | =head1 DESCRIPTION |
81 | |
82 | This module provides a simple counter attribute, which can be |
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83 | incremented and decremented. |
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84 | |
85 | If your attribute definition does not include any of I<is>, I<isa>, |
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86 | I<default> or I<handles> but does use the C<Counter> metaclass, |
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87 | then this module applies defaults as in the L</SYNOPSIS> |
88 | above. This allows for a very basic counter definition: |
89 | |
90 | has 'foo' => (metaclass => 'Counter'); |
91 | $obj->inc_foo; |
92 | |
93 | =head1 METHODS |
94 | |
95 | =over 4 |
96 | |
97 | =item B<meta> |
98 | |
99 | =item B<method_provider> |
100 | |
101 | =item B<has_method_provider> |
102 | |
103 | =item B<helper_type> |
104 | |
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105 | =back |
106 | |
107 | =head1 PROVIDED METHODS |
108 | |
109 | It is important to note that all those methods do in place |
110 | modification of the value stored in the attribute. |
111 | |
112 | =over 4 |
113 | |
114 | =item I<set> |
115 | |
116 | Set the counter to the specified value. |
117 | |
118 | =item I<inc> |
119 | |
120 | Increments the value stored in this slot by 1. Providing an argument will |
121 | cause the counter to be increased by specified amount. |
122 | |
123 | =item I<dec> |
124 | |
125 | Decrements the value stored in this slot by 1. Providing an argument will |
126 | cause the counter to be increased by specified amount. |
127 | |
128 | =item I<reset> |
129 | |
130 | Resets the value stored in this slot to it's default value. |
131 | |
132 | =back |
133 | |
134 | =head1 BUGS |
135 | |
136 | All complex software has bugs lurking in it, and this module is no |
137 | exception. If you find a bug please either email me, or add the bug |
138 | to cpan-RT. |
139 | |
140 | =head1 AUTHOR |
141 | |
142 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
143 | |
144 | =head1 COPYRIGHT AND LICENSE |
145 | |
146 | Copyright 2007-2009 by Infinity Interactive, Inc. |
147 | |
148 | L<http://www.iinteractive.com> |
149 | |
150 | This library is free software; you can redistribute it and/or modify |
151 | it under the same terms as Perl itself. |
152 | |
153 | =cut |