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1 | package Moose::Meta::Role::Composite; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use metaclass; |
6 | |
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7 | use Scalar::Util 'blessed'; |
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8 | |
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9 | our $VERSION = '1.05'; |
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10 | $VERSION = eval $VERSION; |
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11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
13 | use base 'Moose::Meta::Role'; |
14 | |
15 | # NOTE: |
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16 | # we need to override the ->name |
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17 | # method from Class::MOP::Package |
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18 | # since we don't have an actual |
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19 | # package for this. |
20 | # - SL |
21 | __PACKAGE__->meta->add_attribute('name' => (reader => 'name')); |
22 | |
23 | # NOTE: |
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24 | # Again, since we don't have a real |
25 | # package to store our methods in, |
26 | # we use a HASH ref instead. |
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27 | # - SL |
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28 | __PACKAGE__->meta->add_attribute('_methods' => ( |
29 | reader => '_method_map', |
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30 | default => sub { {} } |
31 | )); |
32 | |
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33 | __PACKAGE__->meta->add_attribute( |
34 | 'application_role_summation_class', |
35 | reader => 'application_role_summation_class', |
36 | default => 'Moose::Meta::Role::Application::RoleSummation', |
37 | ); |
38 | |
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39 | sub new { |
40 | my ($class, %params) = @_; |
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41 | |
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42 | # the roles param is required ... |
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43 | foreach ( @{$params{roles}} ) { |
44 | unless ( $_->isa('Moose::Meta::Role') ) { |
45 | require Moose; |
46 | Moose->throw_error("The list of roles must be instances of Moose::Meta::Role, not $_"); |
47 | } |
48 | } |
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49 | |
50 | my @composition_roles = map { |
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51 | $_->composition_class_roles |
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52 | } @{ $params{roles} }; |
53 | |
54 | if (@composition_roles) { |
55 | my $meta = Moose::Meta::Class->create_anon_class( |
56 | superclasses => [ $class ], |
57 | roles => [ @composition_roles ], |
58 | cache => 1, |
59 | ); |
60 | $meta->add_method(meta => sub { $meta }); |
61 | $class = $meta->name; |
62 | } |
63 | |
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64 | # and the name is created from the |
65 | # roles if one has not been provided |
66 | $params{name} ||= (join "|" => map { $_->name } @{$params{roles}}); |
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67 | $class->_new(\%params); |
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68 | } |
69 | |
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70 | # This is largely a cope of what's in Moose::Meta::Role (itself |
71 | # largely a copy of Class::MOP::Class). However, we can't actually |
72 | # call add_package_symbol, because there's no package to which which |
73 | # add the symbol. |
74 | sub add_method { |
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75 | my ($self, $method_name, $method) = @_; |
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76 | |
77 | unless ( defined $method_name && $method_name ) { |
78 | Moose->throw_error("You must define a method name"); |
79 | } |
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80 | |
81 | my $body; |
82 | if (blessed($method)) { |
83 | $body = $method->body; |
84 | if ($method->package_name ne $self->name) { |
85 | $method = $method->clone( |
86 | package_name => $self->name, |
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87 | name => $method_name |
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88 | ) if $method->can('clone'); |
89 | } |
90 | } |
91 | else { |
92 | $body = $method; |
93 | $method = $self->wrap_method_body( body => $body, name => $method_name ); |
94 | } |
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95 | |
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96 | $self->_method_map->{$method_name} = $method; |
97 | } |
98 | |
99 | sub get_method_list { |
100 | my $self = shift; |
101 | return keys %{ $self->_method_map }; |
102 | } |
103 | |
104 | sub has_method { |
105 | my ($self, $method_name) = @_; |
106 | |
107 | return exists $self->_method_map->{$method_name}; |
108 | } |
109 | |
110 | sub get_method { |
111 | my ($self, $method_name) = @_; |
112 | |
113 | return $self->_method_map->{$method_name}; |
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114 | } |
115 | |
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116 | sub apply_params { |
117 | my ($self, $role_params) = @_; |
118 | Class::MOP::load_class($self->application_role_summation_class); |
119 | |
120 | $self->application_role_summation_class->new( |
121 | role_params => $role_params, |
122 | )->apply($self); |
123 | |
124 | return $self; |
125 | } |
126 | |
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127 | sub reinitialize { |
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128 | my ( $class, $old_meta, @args ) = @_; |
129 | |
130 | Moose->throw_error( |
131 | 'Moose::Meta::Role::Composite instances can only be reinitialized from an existing metaclass instance' |
132 | ) |
133 | if !blessed $old_meta |
134 | || !$old_meta->isa('Moose::Meta::Role::Composite'); |
135 | |
136 | my %existing_classes = map { $_ => $old_meta->$_() } qw( |
137 | application_role_summation_class |
138 | ); |
139 | |
140 | return $old_meta->meta->clone_object( $old_meta, %existing_classes, @args ); |
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141 | } |
142 | |
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143 | 1; |
144 | |
145 | __END__ |
146 | |
147 | =pod |
148 | |
149 | =head1 NAME |
150 | |
151 | Moose::Meta::Role::Composite - An object to represent the set of roles |
152 | |
153 | =head1 DESCRIPTION |
154 | |
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155 | A composite is a role that consists of a set of two or more roles. |
156 | |
157 | The API of a composite role is almost identical to that of a regular |
158 | role. |
159 | |
160 | =head1 INHERITANCE |
161 | |
162 | C<Moose::Meta::Role::Composite> is a subclass of L<Moose::Meta::Role>. |
163 | |
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164 | =head2 METHODS |
165 | |
166 | =over 4 |
167 | |
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168 | =item B<< Moose::Meta::Role::Composite->new(%options) >> |
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169 | |
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170 | This returns a new composite role object. It accepts the same |
171 | options as its parent class, with a few changes: |
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172 | |
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173 | =over 8 |
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174 | |
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175 | =item * roles |
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176 | |
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177 | This option is an array reference containing a list of |
178 | L<Moose::Meta::Role> object. This is a required option. |
179 | |
180 | =item * name |
181 | |
182 | If a name is not given, one is generated from the roles provided. |
183 | |
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184 | =item * apply_params(\%role_params) |
185 | |
186 | Creates a new RoleSummation role application with C<%role_params> and applies |
187 | the composite role to it. The RoleSummation role application class used is |
188 | determined by the composite role's C<application_role_summation_class> |
189 | attribute. |
190 | |
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191 | =item * reinitialize($metaclass) |
192 | |
193 | Like C<< Class::MOP::Package->reinitialize >>, but doesn't allow passing a |
194 | string with the package name, as there is no real package for composite roles. |
195 | |
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196 | =back |
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197 | |
198 | =back |
199 | |
200 | =head1 BUGS |
201 | |
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202 | See L<Moose/BUGS> for details on reporting bugs. |
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203 | |
204 | =head1 AUTHOR |
205 | |
206 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
207 | |
208 | =head1 COPYRIGHT AND LICENSE |
209 | |
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210 | Copyright 2006-2010 by Infinity Interactive, Inc. |
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211 | |
212 | L<http://www.iinteractive.com> |
213 | |
214 | This library is free software; you can redistribute it and/or modify |
215 | it under the same terms as Perl itself. |
216 | |
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217 | =cut |