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1 | |
2 | package Moose::AttributeHelpers::Trait::Base; |
3 | use Moose::Role; |
4 | use Moose::Util::TypeConstraints; |
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5 | use Moose::AttributeHelpers::Meta::Method::Delegation; |
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6 | |
7 | our $VERSION = '0.19'; |
8 | $VERSION = eval $VERSION; |
9 | our $AUTHORITY = 'cpan:STEVAN'; |
10 | |
11 | requires 'helper_type'; |
12 | |
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13 | # these next two are the possible methods |
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14 | # you can use in the 'handles' map. |
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15 | |
16 | # provide a Class or Role which we can |
17 | # collect the method providers from |
18 | |
19 | # requires_attr 'method_provider' |
20 | |
21 | # or you can provide a HASH ref of anon subs |
22 | # yourself. This will also collect and store |
23 | # the methods from a method_provider as well |
24 | has 'method_constructors' => ( |
25 | is => 'ro', |
26 | isa => 'HashRef', |
27 | lazy => 1, |
28 | default => sub { |
29 | my $self = shift; |
30 | return +{} unless $self->has_method_provider; |
31 | # or grab them from the role/class |
32 | my $method_provider = $self->method_provider->meta; |
33 | return +{ |
34 | map { |
35 | $_ => $method_provider->get_method($_) |
36 | } $method_provider->get_method_list |
37 | }; |
38 | }, |
39 | ); |
40 | |
41 | # extend the parents stuff to make sure |
42 | # certain bits are now required ... |
43 | has '+default' => (required => 1); |
44 | has '+type_constraint' => (required => 1); |
45 | |
46 | ## Methods called prior to instantiation |
47 | |
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48 | sub process_options_for_handles { |
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49 | my ($self, $options) = @_; |
50 | |
51 | if (my $type = $self->helper_type) { |
52 | (exists $options->{isa}) |
53 | || confess "You must define a type with the $type metaclass"; |
54 | |
55 | my $isa = $options->{isa}; |
56 | |
57 | unless (blessed($isa) && $isa->isa('Moose::Meta::TypeConstraint')) { |
58 | $isa = Moose::Util::TypeConstraints::find_or_create_type_constraint($isa); |
59 | } |
60 | |
61 | ($isa->is_a_type_of($type)) |
62 | || confess "The type constraint for a $type ($options->{isa}) must be a subtype of $type"; |
63 | } |
64 | } |
65 | |
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66 | sub delegation_metaclass { |
67 | 'Moose::AttributeHelpers::Meta::Method::Delegation' |
68 | } |
69 | |
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70 | before '_process_options' => sub { |
71 | my ($self, $name, $options) = @_; |
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72 | $self->process_options_for_handles($options, $name); |
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73 | }; |
74 | |
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75 | around '_canonicalize_handles' => sub { |
76 | my $next = shift; |
77 | my $self = shift; |
78 | my $handles = $self->handles; |
79 | return unless $handles; |
80 | unless ('HASH' eq ref $handles) { |
81 | $self->throw_error( |
82 | "The 'handles' option must be a HASH reference, not $handles" |
83 | ); |
84 | } |
85 | return map { |
86 | my $to = $handles->{$_}; |
87 | $to = [ $to ] unless ref $to; |
88 | $_ => $to |
89 | } keys %$handles; |
90 | }; |
91 | |
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92 | ## methods called after instantiation |
93 | |
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94 | before 'install_delegation' => sub { (shift)->check_handles_values }; |
95 | |
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96 | sub check_handles_values { |
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97 | my $self = shift; |
98 | |
99 | my $method_constructors = $self->method_constructors; |
100 | |
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101 | my %handles = $self->_canonicalize_handles; |
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102 | |
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103 | for my $original_method (values %handles) { |
104 | my $name = $original_method->[0]; |
105 | (exists $method_constructors->{$name}) |
106 | || confess "$name is an unsupported method type"; |
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107 | } |
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108 | |
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109 | } |
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110 | |
111 | no Moose::Role; |
112 | no Moose::Util::TypeConstraints; |
113 | |
114 | 1; |
115 | |
116 | __END__ |
117 | |
118 | =head1 NAME |
119 | |
120 | Moose::AttributeHelpers::Trait::Base - base role for helpers |
121 | |
122 | =head1 METHODS |
123 | |
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124 | =head2 check_handles_values |
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125 | |
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126 | Confirms that handles has all valid possibilities in it. |
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127 | |
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128 | =head2 process_options_for_handles |
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129 | |
130 | Ensures that the type constraint (C<isa>) matches the helper type. |
131 | |
132 | =head1 BUGS |
133 | |
134 | All complex software has bugs lurking in it, and this module is no |
135 | exception. If you find a bug please either email me, or add the bug |
136 | to cpan-RT. |
137 | |
138 | =head1 AUTHORS |
139 | |
140 | Yuval Kogman |
141 | |
142 | Shawn M Moore |
143 | |
144 | Jesse Luehrs |
145 | |
146 | =head1 COPYRIGHT AND LICENSE |
147 | |
148 | Copyright 2007-2009 by Infinity Interactive, Inc. |
149 | |
150 | L<http://www.iinteractive.com> |
151 | |
152 | This library is free software; you can redistribute it and/or modify |
153 | it under the same terms as Perl itself. |
154 | |
155 | =cut |