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3fea05b9 |
1 | package MooseX::Role::Parameterized::Meta::Role::Parameterizable; |
2 | use Moose; |
3 | extends 'Moose::Meta::Role'; |
4 | |
5 | our $VERSION = '0.10'; |
6 | |
7 | use MooseX::Role::Parameterized::Meta::Role::Parameterized; |
8 | use MooseX::Role::Parameterized::Meta::Parameter; |
9 | use MooseX::Role::Parameterized::Parameters; |
10 | |
11 | use constant parameterized_role_metaclass => 'MooseX::Role::Parameterized::Meta::Role::Parameterized'; |
12 | use constant parameter_metaclass => 'MooseX::Role::Parameterized::Meta::Parameter'; |
13 | |
14 | has parameters_class => ( |
15 | is => 'ro', |
16 | isa => 'ClassName', |
17 | default => 'MooseX::Role::Parameterized::Parameters', |
18 | ); |
19 | |
20 | has parameters_metaclass => ( |
21 | is => 'rw', |
22 | isa => 'Moose::Meta::Class', |
23 | lazy => 1, |
24 | default => sub { |
25 | my $self = shift; |
26 | |
27 | $self->parameters_class->meta->create_anon_class( |
28 | superclasses => [$self->parameters_class], |
29 | attribute_metaclass => $self->parameter_metaclass, |
30 | ); |
31 | }, |
32 | handles => { |
33 | has_parameter => 'has_attribute', |
34 | }, |
35 | ); |
36 | |
37 | has role_generator => ( |
38 | is => 'rw', |
39 | isa => 'CodeRef', |
40 | predicate => 'has_role_generator', |
41 | ); |
42 | |
43 | sub add_parameter { |
44 | my $self = shift; |
45 | my $name = shift; |
46 | |
47 | confess "You must provide a name for the parameter" |
48 | if !defined($name); |
49 | |
50 | # need to figure out a plan for these guys.. |
51 | confess "The parameter name ($name) is currently forbidden" |
52 | if $name eq 'alias' |
53 | || $name eq 'excludes'; |
54 | |
55 | $self->parameters_metaclass->add_attribute($name => @_); |
56 | } |
57 | |
58 | sub construct_parameters { |
59 | my $self = shift; |
60 | my %args = @_; |
61 | |
62 | # need to figure out a plan for these guys.. |
63 | for my $name ('alias', 'excludes') { |
64 | confess "The parameter name ($name) is currently forbidden" |
65 | if exists $args{$name}; |
66 | } |
67 | |
68 | $self->parameters_metaclass->new_object(\%args); |
69 | } |
70 | |
71 | sub generate_role { |
72 | my $self = shift; |
73 | my %args = @_; |
74 | |
75 | my $parameters = blessed($args{parameters}) |
76 | ? $args{parameters} |
77 | : $self->construct_parameters(%{ $args{parameters} }); |
78 | |
79 | confess "A role generator is required to generate roles" |
80 | unless $self->has_role_generator; |
81 | |
82 | my $role = $self->parameterized_role_metaclass->create_anon_role( |
83 | genitor => $self, |
84 | parameters => $parameters, |
85 | ); |
86 | |
87 | local $MooseX::Role::Parameterized::CURRENT_METACLASS = $role; |
88 | |
89 | $self->apply_parameterizable_role($role); |
90 | |
91 | $self->role_generator->($parameters, |
92 | operating_on => $role, |
93 | consumer => $args{consumer}, |
94 | ); |
95 | |
96 | return $role; |
97 | } |
98 | |
99 | sub _role_for_combination { |
100 | my $self = shift; |
101 | my $parameters = shift; |
102 | |
103 | return $self->generate_role( |
104 | parameters => $parameters, |
105 | ); |
106 | } |
107 | |
108 | sub apply { |
109 | my $self = shift; |
110 | my $consumer = shift; |
111 | my %args = @_; |
112 | |
113 | my $role = $self->generate_role( |
114 | consumer => $consumer, |
115 | parameters => \%args, |
116 | ); |
117 | |
118 | $role->apply($consumer, %args); |
119 | } |
120 | |
121 | sub apply_parameterizable_role { |
122 | my $self = shift; |
123 | |
124 | $self->SUPER::apply(@_); |
125 | } |
126 | |
127 | __PACKAGE__->meta->make_immutable; |
128 | no Moose; |
129 | |
130 | 1; |
131 | |
132 | __END__ |
133 | |
134 | =head1 NAME |
135 | |
136 | MooseX::Role::Parameterized::Meta::Role::Parameterizable - metaclass for parameterizable roles |
137 | |
138 | =head1 DESCRIPTION |
139 | |
140 | This is the metaclass for parameterizable roles, roles that have their |
141 | parameters currently unbound. These are the roles that you use L<Moose/with>, |
142 | but instead of composing the parameterizable role, we construct a new |
143 | parameterized role |
144 | (L<MooseX::Role::Parameterized::Meta::Role::Parameterized>). |
145 | |
146 | =head1 ATTRIBUTES |
147 | |
148 | =head2 parameters_class |
149 | |
150 | The name of the class that will be used to construct the parameters object. |
151 | |
152 | =head2 parameters_metaclass |
153 | |
154 | A metaclass representing this roles's parameters. It will be an anonymous |
155 | subclass of L</parameters_class>. Each call to |
156 | L<MooseX::Role::Parameters/parameter> adds an attribute to this metaclass. |
157 | |
158 | When this role is consumed, the parameters object will be instantiated using |
159 | this metaclass. |
160 | |
161 | =head2 role_generator |
162 | |
163 | A code reference that is used to generate a role based on the parameters |
164 | provided by the consumer. The user usually specifies it using the |
165 | L<MooseX::Role::Parameterized/role> keyword. |
166 | |
167 | =head1 METHODS |
168 | |
169 | =head2 add_parameter $name, %options |
170 | |
171 | Basically delegates to L<Moose::Meta::Class/add_attribute> on the |
172 | L</parameters_metaclass> but with error messages that refer to a "parameter" |
173 | not an "attribute". |
174 | |
175 | =head2 construct_parameters %arguments |
176 | |
177 | Creates a new L<MooseX::Role::Parameterized::Parameters> object using metaclass |
178 | L</parameters_metaclass>. |
179 | |
180 | The arguments are those specified by the consumer as parameter values. |
181 | |
182 | =head2 generate_role %arguments |
183 | |
184 | Returns a new instance of |
185 | L<MooseX::Role::Parameterized::Meta::Role::Parameterized> based on the |
186 | arguments. The arguments are a hash reference of C<parameters> and, if |
187 | available, a C<consumer> metaobject. |
188 | |
189 | =head2 apply |
190 | |
191 | Overrides L<Moose::Meta::Role/apply> to automatically generate the |
192 | parameterized role. |
193 | |
194 | =cut |
195 | |