Commit | Line | Data |
c0e30cf5 |
1 | |
2 | package Moose::Meta::Attribute; |
3 | |
4 | use strict; |
5 | use warnings; |
6 | |
21f1e231 |
7 | use Scalar::Util 'blessed', 'weaken'; |
a909a4df |
8 | use overload (); |
a15dff8d |
9 | |
e6ab9ca5 |
10 | our $VERSION = '0.83'; |
d44714be |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
78cd1d3b |
12 | |
8ee73eeb |
13 | use Moose::Meta::Method::Accessor; |
a05f85c1 |
14 | use Moose::Meta::Method::Delegation; |
d5c30e52 |
15 | use Moose::Util (); |
a3c7e2fe |
16 | use Moose::Util::TypeConstraints (); |
bc1e29b5 |
17 | |
c0e30cf5 |
18 | use base 'Class::MOP::Attribute'; |
19 | |
452bac1b |
20 | # options which are not directly used |
21 | # but we store them for metadata purposes |
98aae381 |
22 | __PACKAGE__->meta->add_attribute('isa' => (reader => '_isa_metadata')); |
23 | __PACKAGE__->meta->add_attribute('does' => (reader => '_does_metadata')); |
24 | __PACKAGE__->meta->add_attribute('is' => (reader => '_is_metadata')); |
452bac1b |
25 | |
26 | # these are actual options for the attrs |
1a563243 |
27 | __PACKAGE__->meta->add_attribute('required' => (reader => 'is_required' )); |
28 | __PACKAGE__->meta->add_attribute('lazy' => (reader => 'is_lazy' )); |
26fbace8 |
29 | __PACKAGE__->meta->add_attribute('lazy_build' => (reader => 'is_lazy_build' )); |
1a563243 |
30 | __PACKAGE__->meta->add_attribute('coerce' => (reader => 'should_coerce' )); |
31 | __PACKAGE__->meta->add_attribute('weak_ref' => (reader => 'is_weak_ref' )); |
32 | __PACKAGE__->meta->add_attribute('auto_deref' => (reader => 'should_auto_deref')); |
82168dbb |
33 | __PACKAGE__->meta->add_attribute('type_constraint' => ( |
34 | reader => 'type_constraint', |
35 | predicate => 'has_type_constraint', |
36 | )); |
8c9d74e7 |
37 | __PACKAGE__->meta->add_attribute('trigger' => ( |
38 | reader => 'trigger', |
39 | predicate => 'has_trigger', |
40 | )); |
452bac1b |
41 | __PACKAGE__->meta->add_attribute('handles' => ( |
42 | reader => 'handles', |
43 | predicate => 'has_handles', |
44 | )); |
ddbdc0cb |
45 | __PACKAGE__->meta->add_attribute('documentation' => ( |
46 | reader => 'documentation', |
47 | predicate => 'has_documentation', |
48 | )); |
82a5b1a7 |
49 | __PACKAGE__->meta->add_attribute('traits' => ( |
50 | reader => 'applied_traits', |
51 | predicate => 'has_applied_traits', |
52 | )); |
82168dbb |
53 | |
d03bd989 |
54 | # we need to have a ->does method in here to |
55 | # more easily support traits, and the introspection |
0db4f1d7 |
56 | # of those traits. We extend the does check to look |
57 | # for metatrait aliases. |
58 | sub does { |
59 | my ($self, $role_name) = @_; |
60 | my $name = eval { |
61 | Moose::Util::resolve_metatrait_alias(Attribute => $role_name) |
62 | }; |
63 | return 0 if !defined($name); # failed to load class |
e8895723 |
64 | return $self->Moose::Object::does($name); |
0db4f1d7 |
65 | } |
587e457d |
66 | |
be05faea |
67 | sub throw_error { |
68 | my $self = shift; |
69 | my $class = ( ref $self && $self->associated_class ) || "Moose::Meta::Class"; |
70 | unshift @_, "message" if @_ % 2 == 1; |
71 | unshift @_, attr => $self if ref $self; |
72 | unshift @_, $class; |
18748ad6 |
73 | my $handler = $class->can("throw_error"); # to avoid incrementing depth by 1 |
74 | goto $handler; |
be05faea |
75 | } |
76 | |
78cd1d3b |
77 | sub new { |
f3c4e20e |
78 | my ($class, $name, %options) = @_; |
c32c2c61 |
79 | $class->_process_options($name, \%options) unless $options{__hack_no_process_options}; # used from clone()... YECHKKK FIXME ICKY YUCK GROSS |
f3c4e20e |
80 | return $class->SUPER::new($name, %options); |
1d768fb1 |
81 | } |
82 | |
d5c30e52 |
83 | sub interpolate_class_and_new { |
84 | my ($class, $name, @args) = @_; |
85 | |
c32c2c61 |
86 | my ( $new_class, @traits ) = $class->interpolate_class(@args); |
d03bd989 |
87 | |
c32c2c61 |
88 | $new_class->new($name, @args, ( scalar(@traits) ? ( traits => \@traits ) : () ) ); |
d5c30e52 |
89 | } |
90 | |
91 | sub interpolate_class { |
92 | my ($class, %options) = @_; |
93 | |
c32c2c61 |
94 | $class = ref($class) || $class; |
95 | |
96 | if ( my $metaclass_name = delete $options{metaclass} ) { |
97 | my $new_class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name ); |
d03bd989 |
98 | |
c32c2c61 |
99 | if ( $class ne $new_class ) { |
100 | if ( $new_class->can("interpolate_class") ) { |
101 | return $new_class->interpolate_class(%options); |
102 | } else { |
103 | $class = $new_class; |
104 | } |
105 | } |
d5c30e52 |
106 | } |
107 | |
c32c2c61 |
108 | my @traits; |
109 | |
d5c30e52 |
110 | if (my $traits = $options{traits}) { |
8974015d |
111 | my $i = 0; |
112 | while ($i < @$traits) { |
113 | my $trait = $traits->[$i++]; |
114 | next if ref($trait); # options to a trait we discarded |
115 | |
116 | $trait = Moose::Util::resolve_metatrait_alias(Attribute => $trait) |
117 | || $trait; |
118 | |
119 | next if $class->does($trait); |
120 | |
121 | push @traits, $trait; |
122 | |
123 | # are there options? |
124 | push @traits, $traits->[$i++] |
125 | if $traits->[$i] && ref($traits->[$i]); |
126 | } |
965743fb |
127 | |
128 | if (@traits) { |
c32c2c61 |
129 | my $anon_class = Moose::Meta::Class->create_anon_class( |
130 | superclasses => [ $class ], |
131 | roles => [ @traits ], |
132 | cache => 1, |
133 | ); |
134 | |
135 | $class = $anon_class->name; |
136 | } |
d5c30e52 |
137 | } |
c32c2c61 |
138 | |
139 | return ( wantarray ? ( $class, @traits ) : $class ); |
d5c30e52 |
140 | } |
141 | |
e606ae5f |
142 | # ... |
143 | |
144 | my @legal_options_for_inheritance = qw( |
d03bd989 |
145 | default coerce required |
146 | documentation lazy handles |
e606ae5f |
147 | builder type_constraint |
5f06098e |
148 | definition_context |
449559bf |
149 | lazy_build |
e606ae5f |
150 | ); |
151 | |
152 | sub legal_options_for_inheritance { @legal_options_for_inheritance } |
153 | |
154 | # NOTE/TODO |
d03bd989 |
155 | # This method *must* be able to handle |
156 | # Class::MOP::Attribute instances as |
157 | # well. Yes, I know that is wrong, but |
158 | # apparently we didn't realize it was |
159 | # doing that and now we have some code |
160 | # which is dependent on it. The real |
161 | # solution of course is to push this |
e606ae5f |
162 | # feature back up into Class::MOP::Attribute |
163 | # but I not right now, I am too lazy. |
d03bd989 |
164 | # However if you are reading this and |
165 | # looking for something to do,.. please |
e606ae5f |
166 | # be my guest. |
167 | # - stevan |
ce0e8d63 |
168 | sub clone_and_inherit_options { |
169 | my ($self, %options) = @_; |
d03bd989 |
170 | |
c32c2c61 |
171 | my %copy = %options; |
d03bd989 |
172 | |
ce0e8d63 |
173 | my %actual_options; |
d03bd989 |
174 | |
e606ae5f |
175 | # NOTE: |
176 | # we may want to extends a Class::MOP::Attribute |
d03bd989 |
177 | # in which case we need to be able to use the |
178 | # core set of legal options that have always |
e606ae5f |
179 | # been here. But we allows Moose::Meta::Attribute |
180 | # instances to changes them. |
181 | # - SL |
182 | my @legal_options = $self->can('legal_options_for_inheritance') |
183 | ? $self->legal_options_for_inheritance |
184 | : @legal_options_for_inheritance; |
d03bd989 |
185 | |
e606ae5f |
186 | foreach my $legal_option (@legal_options) { |
ce0e8d63 |
187 | if (exists $options{$legal_option}) { |
188 | $actual_options{$legal_option} = $options{$legal_option}; |
189 | delete $options{$legal_option}; |
190 | } |
d03bd989 |
191 | } |
26fbace8 |
192 | |
ce0e8d63 |
193 | if ($options{isa}) { |
194 | my $type_constraint; |
8de73ff1 |
195 | if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) { |
196 | $type_constraint = $options{isa}; |
197 | } |
198 | else { |
d40ce9d5 |
199 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa}); |
8de73ff1 |
200 | (defined $type_constraint) |
be05faea |
201 | || $self->throw_error("Could not find the type constraint '" . $options{isa} . "'", data => $options{isa}); |
8de73ff1 |
202 | } |
5e98d2b6 |
203 | |
8de73ff1 |
204 | $actual_options{type_constraint} = $type_constraint; |
ce0e8d63 |
205 | delete $options{isa}; |
206 | } |
d03bd989 |
207 | |
2ea379cb |
208 | if ($options{does}) { |
209 | my $type_constraint; |
210 | if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) { |
211 | $type_constraint = $options{does}; |
212 | } |
213 | else { |
d40ce9d5 |
214 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does}); |
2ea379cb |
215 | (defined $type_constraint) |
be05faea |
216 | || $self->throw_error("Could not find the type constraint '" . $options{does} . "'", data => $options{does}); |
2ea379cb |
217 | } |
218 | |
219 | $actual_options{type_constraint} = $type_constraint; |
220 | delete $options{does}; |
d03bd989 |
221 | } |
c32c2c61 |
222 | |
cbd141ca |
223 | # NOTE: |
d03bd989 |
224 | # this doesn't apply to Class::MOP::Attributes, |
cbd141ca |
225 | # so we can ignore it for them. |
226 | # - SL |
227 | if ($self->can('interpolate_class')) { |
228 | ( $actual_options{metaclass}, my @traits ) = $self->interpolate_class(%options); |
c32c2c61 |
229 | |
cbd141ca |
230 | my %seen; |
231 | my @all_traits = grep { $seen{$_}++ } @{ $self->applied_traits || [] }, @traits; |
232 | $actual_options{traits} = \@all_traits if @all_traits; |
c32c2c61 |
233 | |
cbd141ca |
234 | delete @options{qw(metaclass traits)}; |
235 | } |
c32c2c61 |
236 | |
26fbace8 |
237 | (scalar keys %options == 0) |
be05faea |
238 | || $self->throw_error("Illegal inherited options => (" . (join ', ' => keys %options) . ")", data => \%options); |
c32c2c61 |
239 | |
240 | |
ce0e8d63 |
241 | $self->clone(%actual_options); |
1d768fb1 |
242 | } |
243 | |
c32c2c61 |
244 | sub clone { |
245 | my ( $self, %params ) = @_; |
246 | |
247 | my $class = $params{metaclass} || ref $self; |
248 | |
db72153d |
249 | my ( @init, @non_init ); |
c32c2c61 |
250 | |
0772362a |
251 | foreach my $attr ( grep { $_->has_value($self) } Class::MOP::class_of($self)->get_all_attributes ) { |
db72153d |
252 | push @{ $attr->has_init_arg ? \@init : \@non_init }, $attr; |
253 | } |
c32c2c61 |
254 | |
db72153d |
255 | my %new_params = ( ( map { $_->init_arg => $_->get_value($self) } @init ), %params ); |
c32c2c61 |
256 | |
db72153d |
257 | my $name = delete $new_params{name}; |
c32c2c61 |
258 | |
db72153d |
259 | my $clone = $class->new($name, %new_params, __hack_no_process_options => 1 ); |
c32c2c61 |
260 | |
db72153d |
261 | foreach my $attr ( @non_init ) { |
262 | $attr->set_value($clone, $attr->get_value($self)); |
c32c2c61 |
263 | } |
db72153d |
264 | |
265 | return $clone; |
c32c2c61 |
266 | } |
267 | |
1d768fb1 |
268 | sub _process_options { |
269 | my ($class, $name, $options) = @_; |
8de73ff1 |
270 | |
f3c4e20e |
271 | if (exists $options->{is}) { |
21f1e231 |
272 | |
012fcbd1 |
273 | ### ------------------------- |
274 | ## is => ro, writer => _foo # turns into (reader => foo, writer => _foo) as before |
275 | ## is => rw, writer => _foo # turns into (reader => foo, writer => _foo) |
276 | ## is => rw, accessor => _foo # turns into (accessor => _foo) |
277 | ## is => ro, accessor => _foo # error, accesor is rw |
278 | ### ------------------------- |
d03bd989 |
279 | |
8de73ff1 |
280 | if ($options->{is} eq 'ro') { |
be05faea |
281 | $class->throw_error("Cannot define an accessor name on a read-only attribute, accessors are read/write", data => $options) |
21f1e231 |
282 | if exists $options->{accessor}; |
8de73ff1 |
283 | $options->{reader} ||= $name; |
8de73ff1 |
284 | } |
285 | elsif ($options->{is} eq 'rw') { |
21f1e231 |
286 | if ($options->{writer}) { |
287 | $options->{reader} ||= $name; |
288 | } |
289 | else { |
290 | $options->{accessor} ||= $name; |
291 | } |
8de73ff1 |
292 | } |
293 | else { |
e606ae5f |
294 | $class->throw_error("I do not understand this option (is => " . $options->{is} . ") on attribute ($name)", data => $options->{is}); |
8de73ff1 |
295 | } |
f3c4e20e |
296 | } |
8de73ff1 |
297 | |
f3c4e20e |
298 | if (exists $options->{isa}) { |
f3c4e20e |
299 | if (exists $options->{does}) { |
300 | if (eval { $options->{isa}->can('does') }) { |
301 | ($options->{isa}->does($options->{does})) |
e606ae5f |
302 | || $class->throw_error("Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)", data => $options); |
f3c4e20e |
303 | } |
304 | else { |
e606ae5f |
305 | $class->throw_error("Cannot have an isa option which cannot ->does() on attribute ($name)", data => $options); |
26fbace8 |
306 | } |
26fbace8 |
307 | } |
8de73ff1 |
308 | |
f3c4e20e |
309 | # allow for anon-subtypes here ... |
310 | if (blessed($options->{isa}) && $options->{isa}->isa('Moose::Meta::TypeConstraint')) { |
8de73ff1 |
311 | $options->{type_constraint} = $options->{isa}; |
312 | } |
313 | else { |
620db045 |
314 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa}); |
8de73ff1 |
315 | } |
f3c4e20e |
316 | } |
317 | elsif (exists $options->{does}) { |
318 | # allow for anon-subtypes here ... |
319 | if (blessed($options->{does}) && $options->{does}->isa('Moose::Meta::TypeConstraint')) { |
238b424d |
320 | $options->{type_constraint} = $options->{does}; |
8de73ff1 |
321 | } |
322 | else { |
620db045 |
323 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does}); |
8de73ff1 |
324 | } |
f3c4e20e |
325 | } |
8de73ff1 |
326 | |
f3c4e20e |
327 | if (exists $options->{coerce} && $options->{coerce}) { |
328 | (exists $options->{type_constraint}) |
e606ae5f |
329 | || $class->throw_error("You cannot have coercion without specifying a type constraint on attribute ($name)", data => $options); |
330 | $class->throw_error("You cannot have a weak reference to a coerced value on attribute ($name)", data => $options) |
8de73ff1 |
331 | if $options->{weak_ref}; |
f3c4e20e |
332 | } |
8de73ff1 |
333 | |
0b7df53c |
334 | if (exists $options->{trigger}) { |
21f1e231 |
335 | ('CODE' eq ref $options->{trigger}) |
e606ae5f |
336 | || $class->throw_error("Trigger must be a CODE ref on attribute ($name)", data => $options->{trigger}); |
0b7df53c |
337 | } |
338 | |
f3c4e20e |
339 | if (exists $options->{auto_deref} && $options->{auto_deref}) { |
340 | (exists $options->{type_constraint}) |
e606ae5f |
341 | || $class->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)", data => $options); |
f3c4e20e |
342 | ($options->{type_constraint}->is_a_type_of('ArrayRef') || |
8de73ff1 |
343 | $options->{type_constraint}->is_a_type_of('HashRef')) |
e606ae5f |
344 | || $class->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)", data => $options); |
f3c4e20e |
345 | } |
8de73ff1 |
346 | |
f3c4e20e |
347 | if (exists $options->{lazy_build} && $options->{lazy_build} == 1) { |
e606ae5f |
348 | $class->throw_error("You can not use lazy_build and default for the same attribute ($name)", data => $options) |
8de73ff1 |
349 | if exists $options->{default}; |
a6c84c69 |
350 | $options->{lazy} = 1; |
a6c84c69 |
351 | $options->{builder} ||= "_build_${name}"; |
352 | if ($name =~ /^_/) { |
f3c4e20e |
353 | $options->{clearer} ||= "_clear${name}"; |
354 | $options->{predicate} ||= "_has${name}"; |
d03bd989 |
355 | } |
a6c84c69 |
356 | else { |
f3c4e20e |
357 | $options->{clearer} ||= "clear_${name}"; |
358 | $options->{predicate} ||= "has_${name}"; |
26fbace8 |
359 | } |
f3c4e20e |
360 | } |
8de73ff1 |
361 | |
f3c4e20e |
362 | if (exists $options->{lazy} && $options->{lazy}) { |
9edba990 |
363 | (exists $options->{default} || defined $options->{builder} ) |
be05faea |
364 | || $class->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it", data => $options); |
f3c4e20e |
365 | } |
26fbace8 |
366 | |
9edba990 |
367 | if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) { |
be05faea |
368 | $class->throw_error("You cannot have a required attribute ($name) without a default, builder, or an init_arg", data => $options); |
9edba990 |
369 | } |
370 | |
78cd1d3b |
371 | } |
c0e30cf5 |
372 | |
d500266f |
373 | sub initialize_instance_slot { |
ddd0ec20 |
374 | my ($self, $meta_instance, $instance, $params) = @_; |
d500266f |
375 | my $init_arg = $self->init_arg(); |
376 | # try to fetch the init arg from the %params ... |
ddd0ec20 |
377 | |
26fbace8 |
378 | my $val; |
1ed0b94f |
379 | my $value_is_set; |
625d571f |
380 | if ( defined($init_arg) and exists $params->{$init_arg}) { |
d500266f |
381 | $val = $params->{$init_arg}; |
d03bd989 |
382 | $value_is_set = 1; |
d500266f |
383 | } |
384 | else { |
385 | # skip it if it's lazy |
386 | return if $self->is_lazy; |
387 | # and die if it's required and doesn't have a default value |
be05faea |
388 | $self->throw_error("Attribute (" . $self->name . ") is required", object => $instance, data => $params) |
26fbace8 |
389 | if $self->is_required && !$self->has_default && !$self->has_builder; |
ddd0ec20 |
390 | |
1ed0b94f |
391 | # if nothing was in the %params, we can use the |
392 | # attribute's default value (if it has one) |
393 | if ($self->has_default) { |
394 | $val = $self->default($instance); |
395 | $value_is_set = 1; |
d03bd989 |
396 | } |
a6c84c69 |
397 | elsif ($self->has_builder) { |
e606ae5f |
398 | $val = $self->_call_builder($instance); |
399 | $value_is_set = 1; |
a0748c37 |
400 | } |
26fbace8 |
401 | } |
402 | |
1ed0b94f |
403 | return unless $value_is_set; |
404 | |
9c9563c7 |
405 | $val = $self->_coerce_and_verify( $val, $instance ); |
ddd0ec20 |
406 | |
759e4e8f |
407 | $self->set_initial_value($instance, $val); |
26fbace8 |
408 | $meta_instance->weaken_slot_value($instance, $self->name) |
a6c84c69 |
409 | if ref $val && $self->is_weak_ref; |
d500266f |
410 | } |
411 | |
e606ae5f |
412 | sub _call_builder { |
413 | my ( $self, $instance ) = @_; |
414 | |
415 | my $builder = $self->builder(); |
416 | |
417 | return $instance->$builder() |
418 | if $instance->can( $self->builder ); |
419 | |
420 | $self->throw_error( blessed($instance) |
421 | . " does not support builder method '" |
422 | . $self->builder |
423 | . "' for attribute '" |
424 | . $self->name |
425 | . "'", |
426 | object => $instance, |
427 | ); |
428 | } |
429 | |
d617b644 |
430 | ## Slot management |
9e93dd19 |
431 | |
8abe9636 |
432 | # FIXME: |
d03bd989 |
433 | # this duplicates too much code from |
434 | # Class::MOP::Attribute, we need to |
8abe9636 |
435 | # refactor these bits eventually. |
436 | # - SL |
437 | sub _set_initial_slot_value { |
438 | my ($self, $meta_instance, $instance, $value) = @_; |
439 | |
440 | my $slot_name = $self->name; |
441 | |
442 | return $meta_instance->set_slot_value($instance, $slot_name, $value) |
443 | unless $self->has_initializer; |
444 | |
445 | my ($type_constraint, $can_coerce); |
446 | if ($self->has_type_constraint) { |
447 | $type_constraint = $self->type_constraint; |
448 | $can_coerce = ($self->should_coerce && $type_constraint->has_coercion); |
449 | } |
450 | |
451 | my $callback = sub { |
9c9563c7 |
452 | my $val = $self->_coerce_and_verify( shift, $instance );; |
453 | |
8abe9636 |
454 | $meta_instance->set_slot_value($instance, $slot_name, $val); |
455 | }; |
d03bd989 |
456 | |
8abe9636 |
457 | my $initializer = $self->initializer; |
458 | |
459 | # most things will just want to set a value, so make it first arg |
460 | $instance->$initializer($value, $callback, $self); |
461 | } |
462 | |
946289d1 |
463 | sub set_value { |
b6af66f8 |
464 | my ($self, $instance, @args) = @_; |
465 | my $value = $args[0]; |
26fbace8 |
466 | |
946289d1 |
467 | my $attr_name = $self->name; |
26fbace8 |
468 | |
b6af66f8 |
469 | if ($self->is_required and not @args) { |
be05faea |
470 | $self->throw_error("Attribute ($attr_name) is required", object => $instance); |
946289d1 |
471 | } |
26fbace8 |
472 | |
9c9563c7 |
473 | $value = $self->_coerce_and_verify( $value, $instance ); |
26fbace8 |
474 | |
946289d1 |
475 | my $meta_instance = Class::MOP::Class->initialize(blessed($instance)) |
476 | ->get_meta_instance; |
26fbace8 |
477 | |
478 | $meta_instance->set_slot_value($instance, $attr_name, $value); |
479 | |
946289d1 |
480 | if (ref $value && $self->is_weak_ref) { |
26fbace8 |
481 | $meta_instance->weaken_slot_value($instance, $attr_name); |
946289d1 |
482 | } |
26fbace8 |
483 | |
946289d1 |
484 | if ($self->has_trigger) { |
525129a5 |
485 | $self->trigger->($instance, $value); |
946289d1 |
486 | } |
487 | } |
488 | |
489 | sub get_value { |
490 | my ($self, $instance) = @_; |
26fbace8 |
491 | |
946289d1 |
492 | if ($self->is_lazy) { |
8de73ff1 |
493 | unless ($self->has_value($instance)) { |
e606ae5f |
494 | my $value; |
8de73ff1 |
495 | if ($self->has_default) { |
e606ae5f |
496 | $value = $self->default($instance); |
3f11800d |
497 | } elsif ( $self->has_builder ) { |
e606ae5f |
498 | $value = $self->_call_builder($instance); |
499 | } |
9c9563c7 |
500 | |
501 | $value = $self->_coerce_and_verify( $value, $instance ); |
502 | |
e606ae5f |
503 | $self->set_initial_value($instance, $value); |
8de73ff1 |
504 | } |
946289d1 |
505 | } |
26fbace8 |
506 | |
946289d1 |
507 | if ($self->should_auto_deref) { |
26fbace8 |
508 | |
946289d1 |
509 | my $type_constraint = $self->type_constraint; |
510 | |
511 | if ($type_constraint->is_a_type_of('ArrayRef')) { |
512 | my $rv = $self->SUPER::get_value($instance); |
513 | return unless defined $rv; |
514 | return wantarray ? @{ $rv } : $rv; |
26fbace8 |
515 | } |
946289d1 |
516 | elsif ($type_constraint->is_a_type_of('HashRef')) { |
517 | my $rv = $self->SUPER::get_value($instance); |
518 | return unless defined $rv; |
519 | return wantarray ? %{ $rv } : $rv; |
26fbace8 |
520 | } |
946289d1 |
521 | else { |
46cb090f |
522 | $self->throw_error("Can not auto de-reference the type constraint '" . $type_constraint->name . "'", object => $instance, type_constraint => $type_constraint); |
946289d1 |
523 | } |
26fbace8 |
524 | |
946289d1 |
525 | } |
526 | else { |
26fbace8 |
527 | |
946289d1 |
528 | return $self->SUPER::get_value($instance); |
26fbace8 |
529 | } |
946289d1 |
530 | } |
a15dff8d |
531 | |
26fbace8 |
532 | ## installing accessors |
c0e30cf5 |
533 | |
246bbeef |
534 | sub accessor_metaclass { 'Moose::Meta::Method::Accessor' } |
535 | |
536 | sub install_accessors { |
ae907ae0 |
537 | my $self = shift; |
246bbeef |
538 | $self->SUPER::install_accessors(@_); |
539 | $self->install_delegation if $self->has_handles; |
86cf196b |
540 | unless ( |
541 | # XXX handles should be in associated_methods |
542 | $self->has_handles |
543 | || @{ $self->associated_methods } |
544 | || ($self->_is_metadata || '') eq 'bare' |
545 | ) { |
546 | Carp::cluck( |
547 | 'Attribute (' . $self->name . ') has no associated methods' |
548 | . ' (did you mean to provide an "is" argument?)' |
549 | . "\n" |
550 | ) |
551 | } |
e606ae5f |
552 | return; |
553 | } |
26fbace8 |
554 | |
e1d6f0a3 |
555 | sub remove_accessors { |
556 | my $self = shift; |
557 | $self->SUPER::remove_accessors(@_); |
558 | $self->remove_delegation if $self->has_handles; |
559 | return; |
560 | } |
561 | |
e606ae5f |
562 | sub install_delegation { |
563 | my $self = shift; |
26fbace8 |
564 | |
e606ae5f |
565 | # NOTE: |
566 | # Here we canonicalize the 'handles' option |
567 | # this will sort out any details and always |
568 | # return an hash of methods which we want |
569 | # to delagate to, see that method for details |
570 | my %handles = $self->_canonicalize_handles; |
571 | |
e606ae5f |
572 | |
573 | # install the delegation ... |
574 | my $associated_class = $self->associated_class; |
575 | foreach my $handle (keys %handles) { |
576 | my $method_to_call = $handles{$handle}; |
577 | my $class_name = $associated_class->name; |
578 | my $name = "${class_name}::${handle}"; |
26fbace8 |
579 | |
452bac1b |
580 | (!$associated_class->has_method($handle)) |
cee532a1 |
581 | || $self->throw_error("You cannot overwrite a locally defined method ($handle) with a delegation", method_name => $handle); |
26fbace8 |
582 | |
e606ae5f |
583 | # NOTE: |
584 | # handles is not allowed to delegate |
585 | # any of these methods, as they will |
586 | # override the ones in your class, which |
587 | # is almost certainly not what you want. |
4fe78472 |
588 | |
e606ae5f |
589 | # FIXME warn when $handle was explicitly specified, but not if the source is a regex or something |
590 | #cluck("Not delegating method '$handle' because it is a core method") and |
591 | next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle); |
26fbace8 |
592 | |
46f7e6a5 |
593 | my $method = $self->_make_delegation_method($handle, $method_to_call); |
a05f85c1 |
594 | |
595 | $self->associated_class->add_method($method->name, $method); |
d03bd989 |
596 | } |
452bac1b |
597 | } |
598 | |
e1d6f0a3 |
599 | sub remove_delegation { |
600 | my $self = shift; |
601 | my %handles = $self->_canonicalize_handles; |
602 | my $associated_class = $self->associated_class; |
603 | foreach my $handle (keys %handles) { |
604 | $self->associated_class->remove_method($handle); |
605 | } |
606 | } |
607 | |
98aae381 |
608 | # private methods to help delegation ... |
609 | |
452bac1b |
610 | sub _canonicalize_handles { |
611 | my $self = shift; |
612 | my $handles = $self->handles; |
c84f324f |
613 | if (my $handle_type = ref($handles)) { |
614 | if ($handle_type eq 'HASH') { |
615 | return %{$handles}; |
616 | } |
617 | elsif ($handle_type eq 'ARRAY') { |
618 | return map { $_ => $_ } @{$handles}; |
619 | } |
620 | elsif ($handle_type eq 'Regexp') { |
621 | ($self->has_type_constraint) |
0286711b |
622 | || $self->throw_error("Cannot delegate methods based on a Regexp without a type constraint (isa)", data => $handles); |
26fbace8 |
623 | return map { ($_ => $_) } |
c84f324f |
624 | grep { /$handles/ } $self->_get_delegate_method_list; |
625 | } |
626 | elsif ($handle_type eq 'CODE') { |
627 | return $handles->($self, $self->_find_delegate_metaclass); |
628 | } |
629 | else { |
be05faea |
630 | $self->throw_error("Unable to canonicalize the 'handles' option with $handles", data => $handles); |
c84f324f |
631 | } |
452bac1b |
632 | } |
633 | else { |
c8d9f1e2 |
634 | Class::MOP::load_class($handles); |
635 | my $role_meta = Class::MOP::class_of($handles); |
c84f324f |
636 | |
637 | (blessed $role_meta && $role_meta->isa('Moose::Meta::Role')) |
425ca605 |
638 | || $self->throw_error("Unable to canonicalize the 'handles' option with $handles because its metaclass is not a Moose::Meta::Role", data => $handles); |
d03bd989 |
639 | |
c84f324f |
640 | return map { $_ => $_ } ( |
26fbace8 |
641 | $role_meta->get_method_list, |
b07a4e6d |
642 | map { $_->name } $role_meta->get_required_method_list, |
c84f324f |
643 | ); |
452bac1b |
644 | } |
645 | } |
646 | |
647 | sub _find_delegate_metaclass { |
648 | my $self = shift; |
98aae381 |
649 | if (my $class = $self->_isa_metadata) { |
9031e2c4 |
650 | # we might be dealing with a non-Moose class, |
651 | # and need to make our own metaclass. if there's |
652 | # already a metaclass, it will be returned |
452bac1b |
653 | return Moose::Meta::Class->initialize($class); |
654 | } |
98aae381 |
655 | elsif (my $role = $self->_does_metadata) { |
91e6653b |
656 | return Class::MOP::class_of($role); |
452bac1b |
657 | } |
658 | else { |
be05faea |
659 | $self->throw_error("Cannot find delegate metaclass for attribute " . $self->name); |
452bac1b |
660 | } |
661 | } |
662 | |
663 | sub _get_delegate_method_list { |
664 | my $self = shift; |
665 | my $meta = $self->_find_delegate_metaclass; |
666 | if ($meta->isa('Class::MOP::Class')) { |
e606ae5f |
667 | return map { $_->name } # NOTE: !never! delegate &meta |
668 | grep { $_->package_name ne 'Moose::Object' && $_->name ne 'meta' } |
669 | $meta->get_all_methods; |
452bac1b |
670 | } |
671 | elsif ($meta->isa('Moose::Meta::Role')) { |
26fbace8 |
672 | return $meta->get_method_list; |
452bac1b |
673 | } |
674 | else { |
be05faea |
675 | $self->throw_error("Unable to recognize the delegate metaclass '$meta'", data => $meta); |
452bac1b |
676 | } |
677 | } |
678 | |
bd1226e2 |
679 | sub delegation_metaclass { 'Moose::Meta::Method::Delegation' } |
680 | |
a05f85c1 |
681 | sub _make_delegation_method { |
46f7e6a5 |
682 | my ( $self, $handle_name, $method_to_call ) = @_; |
a05f85c1 |
683 | |
684 | my $method_body; |
685 | |
46f7e6a5 |
686 | $method_body = $method_to_call |
687 | if 'CODE' eq ref($method_to_call); |
a05f85c1 |
688 | |
bd1226e2 |
689 | return $self->delegation_metaclass->new( |
46f7e6a5 |
690 | name => $handle_name, |
691 | package_name => $self->associated_class->name, |
692 | attribute => $self, |
693 | delegate_to_method => $method_to_call, |
a05f85c1 |
694 | ); |
695 | } |
696 | |
9c9563c7 |
697 | sub _coerce_and_verify { |
698 | my $self = shift; |
699 | my $val = shift; |
700 | my $instance = shift; |
701 | |
702 | return $val unless $self->has_type_constraint; |
703 | |
704 | my $type_constraint = $self->type_constraint; |
705 | if ($self->should_coerce && $type_constraint->has_coercion) { |
706 | $val = $type_constraint->coerce($val); |
707 | } |
708 | |
709 | $self->verify_against_type_constraint($val, instance => $instance); |
710 | |
711 | return $val; |
712 | } |
713 | |
5755a9b2 |
714 | sub verify_against_type_constraint { |
2b86e02b |
715 | my $self = shift; |
716 | my $val = shift; |
717 | |
718 | return 1 if !$self->has_type_constraint; |
719 | |
720 | my $type_constraint = $self->type_constraint; |
721 | |
722 | $type_constraint->check($val) |
723 | || $self->throw_error("Attribute (" |
724 | . $self->name |
725 | . ") does not pass the type constraint because: " |
726 | . $type_constraint->get_message($val), data => $val, @_); |
727 | } |
728 | |
21f1e231 |
729 | package Moose::Meta::Attribute::Custom::Moose; |
730 | sub register_implementation { 'Moose::Meta::Attribute' } |
731 | |
c0e30cf5 |
732 | 1; |
733 | |
734 | __END__ |
735 | |
736 | =pod |
737 | |
738 | =head1 NAME |
739 | |
6ba6d68c |
740 | Moose::Meta::Attribute - The Moose attribute metaclass |
c0e30cf5 |
741 | |
742 | =head1 DESCRIPTION |
743 | |
93a708fd |
744 | This class is a subclass of L<Class::MOP::Attribute> that provides |
745 | additional Moose-specific functionality. |
6ba6d68c |
746 | |
7854b409 |
747 | To really understand this class, you will need to start with the |
748 | L<Class::MOP::Attribute> documentation. This class can be understood |
749 | as a set of additional features on top of the basic feature provided |
750 | by that parent class. |
e522431d |
751 | |
d4b1449e |
752 | =head1 INHERITANCE |
753 | |
754 | C<Moose::Meta::Attribute> is a subclass of L<Class::MOP::Attribute>. |
755 | |
c0e30cf5 |
756 | =head1 METHODS |
757 | |
93a708fd |
758 | Many of the documented below override methods in |
759 | L<Class::MOP::Attribute> and add Moose specific features. |
6ba6d68c |
760 | |
93a708fd |
761 | =head2 Creation |
6ba6d68c |
762 | |
c0e30cf5 |
763 | =over 4 |
764 | |
93a708fd |
765 | =item B<< Moose::Meta::Attribute->new(%options) >> |
c0e30cf5 |
766 | |
93a708fd |
767 | This method overrides the L<Class::MOP::Attribute> constructor. |
c32c2c61 |
768 | |
93a708fd |
769 | Many of the options below are described in more detail in the |
770 | L<Moose::Manual::Attributes> document. |
6e2840b7 |
771 | |
93a708fd |
772 | It adds the following options to the constructor: |
d500266f |
773 | |
93a708fd |
774 | =over 8 |
452bac1b |
775 | |
93a708fd |
776 | =item * is => 'ro' or 'rw' |
e1d6f0a3 |
777 | |
93a708fd |
778 | This provides a shorthand for specifying the C<reader>, C<writer>, or |
779 | C<accessor> names. If the attribute is read-only ('ro') then it will |
780 | have a C<reader> method with the same attribute as the name. |
e606ae5f |
781 | |
93a708fd |
782 | If it is read-write ('rw') then it will have an C<accessor> method |
783 | with the same name. If you provide an explicit C<writer> for a |
784 | read-write attribute, then you will have a C<reader> with the same |
785 | name as the attribute, and a C<writer> with the name you provided. |
e1d6f0a3 |
786 | |
93a708fd |
787 | =item * isa => $type |
39b3bc94 |
788 | |
93a708fd |
789 | This option accepts a type. The type can be a string, which should be |
790 | a type name. If the type name is unknown, it is assumed to be a class |
791 | name. |
792 | |
793 | This option can also accept a L<Moose::Meta::TypeConstraint> object. |
794 | |
795 | If you I<also> provide a C<does> option, then your C<isa> option must |
796 | be a class name, and that class must do the role specified with |
797 | C<does>. |
798 | |
799 | =item * does => $role |
800 | |
801 | This is short-hand for saying that the attribute's type must be an |
802 | object which does the named role. |
803 | |
804 | =item * coerce => $bool |
805 | |
806 | This option is only valid for objects with a type constraint |
807 | (C<isa>). If this is true, then coercions will be applied whenever |
808 | this attribute is set. |
809 | |
810 | You can make both this and the C<weak_ref> option true. |
811 | |
812 | =item * trigger => $sub |
813 | |
814 | This option accepts a subroutine reference, which will be called after |
815 | the attribute is set. |
816 | |
817 | =item * required => $bool |
818 | |
819 | An attribute which is required must be provided to the constructor. An |
820 | attribute which is required can also have a C<default> or C<builder>, |
36741534 |
821 | which will satisfy its required-ness. |
93a708fd |
822 | |
823 | A required attribute must have a C<default>, C<builder> or a |
824 | non-C<undef> C<init_arg> |
825 | |
826 | =item * lazy => $bool |
827 | |
828 | A lazy attribute must have a C<default> or C<builder>. When an |
829 | attribute is lazy, the default value will not be calculated until the |
830 | attribute is read. |
831 | |
832 | =item * weak_ref => $bool |
833 | |
834 | If this is true, the attribute's value will be stored as a weak |
835 | reference. |
836 | |
837 | =item * auto_deref => $bool |
838 | |
839 | If this is true, then the reader will dereference the value when it is |
840 | called. The attribute must have a type constraint which defines the |
841 | attribute as an array or hash reference. |
842 | |
843 | =item * lazy_build => $bool |
844 | |
845 | Setting this to true makes the attribute lazy and provides a number of |
846 | default methods. |
847 | |
848 | has 'size' => ( |
849 | is => 'ro', |
850 | lazy_build => 1, |
851 | ); |
852 | |
853 | is equivalent to this: |
854 | |
855 | has 'size' => ( |
856 | is => 'ro', |
857 | lazy => 1, |
858 | builder => '_build_size', |
859 | clearer => 'clear_size', |
860 | predicate => 'has_size', |
861 | ); |
862 | |
863 | =item * documentation |
864 | |
865 | An arbitrary string that can be retrieved later by calling C<< |
866 | $attr->documentation >>. |
867 | |
868 | =back |
869 | |
870 | =item B<< $attr->clone(%options) >> |
871 | |
872 | This creates a new attribute based on attribute being cloned. You must |
873 | supply a C<name> option to provide a new name for the attribute. |
874 | |
875 | The C<%options> can only specify options handled by |
876 | L<Class::MOP::Attribute>. |
877 | |
36741534 |
878 | =back |
879 | |
93a708fd |
880 | =head2 Value management |
881 | |
36741534 |
882 | =over 4 |
883 | |
93a708fd |
884 | =item B<< $attr->initialize_instance_slot($meta_instance, $instance, $params) >> |
885 | |
886 | This method is used internally to initialize the attribute's slot in |
887 | the object C<$instance>. |
888 | |
889 | This overrides the L<Class::MOP::Attribute> method to handle lazy |
890 | attributes, weak references, and type constraints. |
bd1226e2 |
891 | |
946289d1 |
892 | =item B<get_value> |
893 | |
894 | =item B<set_value> |
895 | |
6549b0d1 |
896 | eval { $point->meta->get_attribute('x')->set_value($point, 'forty-two') }; |
bcbaa845 |
897 | if($@) { |
898 | print "Oops: $@\n"; |
899 | } |
900 | |
6549b0d1 |
901 | I<Attribute (x) does not pass the type constraint (Int) with 'forty-two'> |
bcbaa845 |
902 | |
903 | Before setting the value, a check is made on the type constraint of |
904 | the attribute, if it has one, to see if the value passes it. If the |
46cb090f |
905 | value fails to pass, the set operation dies with a L<throw_error>. |
bcbaa845 |
906 | |
907 | Any coercion to convert values is done before checking the type constraint. |
908 | |
909 | To check a value against a type constraint before setting it, fetch the |
ec00fa75 |
910 | attribute instance using L<Class::MOP::Class/find_attribute_by_name>, |
bcbaa845 |
911 | fetch the type_constraint from the attribute using L<Moose::Meta::Attribute/type_constraint> |
e606ae5f |
912 | and call L<Moose::Meta::TypeConstraint/check>. See L<Moose::Cookbook::Basics::Recipe4> |
bcbaa845 |
913 | for an example. |
914 | |
a15dff8d |
915 | =back |
916 | |
93a708fd |
917 | =head2 Attribute Accessor generation |
6ba6d68c |
918 | |
a15dff8d |
919 | =over 4 |
920 | |
93a708fd |
921 | =item B<< $attr->install_accessors >> |
be05faea |
922 | |
93a708fd |
923 | This method overrides the parent to also install delegation methods. |
be05faea |
924 | |
7a582117 |
925 | If, after installing all methods, the attribute object has no associated |
926 | methods, it throws an error unless C<< is => 'bare' >> was passed to the |
927 | attribute constructor. (Trying to add an attribute that has no associated |
928 | methods is almost always an error.) |
929 | |
36741534 |
930 | =item B<< $attr->remove_accessors >> |
d5c30e52 |
931 | |
93a708fd |
932 | This method overrides the parent to also remove delegation methods. |
d5c30e52 |
933 | |
93a708fd |
934 | =item B<< $attr->install_delegation >> |
935 | |
936 | This method adds its delegation methods to the attribute's associated |
937 | class, if it has any to add. |
938 | |
939 | =item B<< $attr->remove_delegation >> |
940 | |
941 | This method remove its delegation methods from the attribute's |
942 | associated class. |
d5c30e52 |
943 | |
93a708fd |
944 | =item B<< $attr->accessor_metaclass >> |
9e93dd19 |
945 | |
93a708fd |
946 | Returns the accessor metaclass name, which defaults to |
947 | L<Moose::Meta::Method::Accessor>. |
948 | |
949 | =item B<< $attr->delegation_metaclass >> |
950 | |
951 | Returns the delegation metaclass name, which defaults to |
952 | L<Moose::Meta::Method::Delegation>. |
953 | |
954 | =back |
955 | |
956 | =head2 Additional Moose features |
957 | |
958 | These methods are not found in the superclass. They support features |
959 | provided by Moose. |
960 | |
36741534 |
961 | =over 4 |
962 | |
93a708fd |
963 | =item B<< $attr->does($role) >> |
964 | |
965 | This indicates whether the I<attribute itself> does the given |
36741534 |
966 | role. The role can be given as a full class name, or as a resolvable |
93a708fd |
967 | trait name. |
968 | |
969 | Note that this checks the attribute itself, not its type constraint, |
970 | so it is checking the attribute's metaclass and any traits applied to |
971 | the attribute. |
972 | |
973 | =item B<< Moose::Meta::Class->interpolate_class_and_new($name, %options) >> |
974 | |
975 | This is an alternate constructor that handles the C<metaclass> and |
976 | C<traits> options. |
9e93dd19 |
977 | |
93a708fd |
978 | Effectively, this method is a factory that finds or creates the |
36741534 |
979 | appropriate class for the given C<metaclass> and/or C<traits>. |
e606ae5f |
980 | |
93a708fd |
981 | Once it has the appropriate class, it will call C<< $class->new($name, |
982 | %options) >> on that class. |
e606ae5f |
983 | |
93a708fd |
984 | =item B<< $attr->clone_and_inherit_options(%options) >> |
a15dff8d |
985 | |
93a708fd |
986 | This method supports the C<has '+foo'> feature. It does various bits |
987 | of processing on the supplied C<%options> before ultimately calling |
988 | the C<clone> method. |
6ba6d68c |
989 | |
93a708fd |
990 | One of its main tasks is to make sure that the C<%options> provided |
991 | only includes the options returned by the |
992 | C<legal_options_for_inheritance> method. |
a15dff8d |
993 | |
93a708fd |
994 | =item B<< $attr->legal_options_for_inheritance >> |
a15dff8d |
995 | |
93a708fd |
996 | This returns a whitelist of options that can be overridden in a |
997 | subclass's attribute definition. |
2b86e02b |
998 | |
93a708fd |
999 | This exists to allow a custom metaclass to change or add to the list |
1000 | of options which can be changed. |
2b86e02b |
1001 | |
93a708fd |
1002 | =item B<< $attr->type_constraint >> |
452bac1b |
1003 | |
93a708fd |
1004 | Returns the L<Moose::Meta::TypeConstraint> object for this attribute, |
1005 | if it has one. |
452bac1b |
1006 | |
93a708fd |
1007 | =item B<< $attr->has_type_constraint >> |
452bac1b |
1008 | |
93a708fd |
1009 | Returns true if this attribute has a type constraint. |
452bac1b |
1010 | |
93a708fd |
1011 | =item B<< $attr->verify_against_type_constraint($value) >> |
a15dff8d |
1012 | |
93a708fd |
1013 | Given a value, this method returns true if the value is valid for the |
1014 | attribute's type constraint. If the value is not valid, it throws an |
1015 | error. |
4b598ea3 |
1016 | |
93a708fd |
1017 | =item B<< $attr->handles >> |
ca01a97b |
1018 | |
93a708fd |
1019 | This returns the value of the C<handles> option passed to the |
1020 | constructor. |
ca01a97b |
1021 | |
93a708fd |
1022 | =item B<< $attr->has_handles >> |
ca01a97b |
1023 | |
93a708fd |
1024 | Returns true if this attribute performs delegation. |
ca01a97b |
1025 | |
93a708fd |
1026 | =item B<< $attr->is_weak_ref >> |
26fbace8 |
1027 | |
93a708fd |
1028 | Returns true if this attribute stores its value as a weak reference. |
26fbace8 |
1029 | |
93a708fd |
1030 | =item B<< $attr->is_required >> |
26fbace8 |
1031 | |
93a708fd |
1032 | Returns true if this attribute is required to have a value. |
26fbace8 |
1033 | |
93a708fd |
1034 | =item B<< $attr->is_lazy >> |
58f85113 |
1035 | |
93a708fd |
1036 | Returns true if this attribute is lazy. |
26fbace8 |
1037 | |
93a708fd |
1038 | =item B<< $attr->is_lazy_build >> |
ca01a97b |
1039 | |
93a708fd |
1040 | Returns true if the C<lazy_build> option was true when passed to the |
1041 | constructor. |
4b598ea3 |
1042 | |
93a708fd |
1043 | =item B<< $attr->should_coerce >> |
6ba6d68c |
1044 | |
93a708fd |
1045 | Returns true if the C<coerce> option passed to the constructor was |
1046 | true. |
536f0b17 |
1047 | |
93a708fd |
1048 | =item B<< $attr->should_auto_deref >> |
536f0b17 |
1049 | |
93a708fd |
1050 | Returns true if the C<auto_deref> option passed to the constructor was |
1051 | true. |
536f0b17 |
1052 | |
93a708fd |
1053 | =item B<< $attr->trigger >> |
8c9d74e7 |
1054 | |
93a708fd |
1055 | This is the subroutine reference that was in the C<trigger> option |
1056 | passed to the constructor, if any. |
02a0fb52 |
1057 | |
36741534 |
1058 | =item B<< $attr->has_trigger >> |
8c9d74e7 |
1059 | |
93a708fd |
1060 | Returns true if this attribute has a trigger set. |
02a0fb52 |
1061 | |
93a708fd |
1062 | =item B<< $attr->documentation >> |
ddbdc0cb |
1063 | |
93a708fd |
1064 | Returns the value that was in the C<documentation> option passed to |
1065 | the constructor, if any. |
ddbdc0cb |
1066 | |
93a708fd |
1067 | =item B<< $attr->has_documentation >> |
ddbdc0cb |
1068 | |
93a708fd |
1069 | Returns true if this attribute has any documentation. |
ddbdc0cb |
1070 | |
93a708fd |
1071 | =item B<< $attr->applied_traits >> |
88f23977 |
1072 | |
93a708fd |
1073 | This returns an array reference of all the traits which were applied |
1074 | to this attribute. If none were applied, this returns C<undef>. |
88f23977 |
1075 | |
93a708fd |
1076 | =item B<< $attr->has_applied_traits >> |
88f23977 |
1077 | |
93a708fd |
1078 | Returns true if this attribute has any traits applied. |
88f23977 |
1079 | |
c0e30cf5 |
1080 | =back |
1081 | |
1082 | =head1 BUGS |
1083 | |
26fbace8 |
1084 | All complex software has bugs lurking in it, and this module is no |
c0e30cf5 |
1085 | exception. If you find a bug please either email me, or add the bug |
1086 | to cpan-RT. |
1087 | |
c0e30cf5 |
1088 | =head1 AUTHOR |
1089 | |
1090 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
1091 | |
98aae381 |
1092 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
1093 | |
c0e30cf5 |
1094 | =head1 COPYRIGHT AND LICENSE |
1095 | |
2840a3b2 |
1096 | Copyright 2006-2009 by Infinity Interactive, Inc. |
c0e30cf5 |
1097 | |
1098 | L<http://www.iinteractive.com> |
1099 | |
1100 | This library is free software; you can redistribute it and/or modify |
26fbace8 |
1101 | it under the same terms as Perl itself. |
c0e30cf5 |
1102 | |
8a7a9c53 |
1103 | =cut |