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 | |
9e4ed568 |
10 | our $VERSION = '0.84'; |
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 |
aa4c3a8d |
80 | |
81 | delete $options{__hack_no_process_options}; |
82 | |
83 | my %attrs = |
84 | ( map { $_ => 1 } |
85 | grep { defined } |
86 | map { $_->init_arg() } |
87 | $class->meta()->get_all_attributes() |
88 | ); |
89 | |
90 | my @bad = sort grep { ! $attrs{$_} } keys %options; |
91 | |
92 | if (@bad) |
93 | { |
94 | Carp::cluck "Found unknown argument(s) passed to '$name' attribute constructor in '$class': @bad"; |
95 | } |
96 | |
f3c4e20e |
97 | return $class->SUPER::new($name, %options); |
1d768fb1 |
98 | } |
99 | |
d5c30e52 |
100 | sub interpolate_class_and_new { |
aa4c3a8d |
101 | my ($class, $name, %args) = @_; |
d5c30e52 |
102 | |
aa4c3a8d |
103 | my ( $new_class, @traits ) = $class->interpolate_class(\%args); |
d03bd989 |
104 | |
aa4c3a8d |
105 | $new_class->new($name, %args, ( scalar(@traits) ? ( traits => \@traits ) : () ) ); |
d5c30e52 |
106 | } |
107 | |
108 | sub interpolate_class { |
aa4c3a8d |
109 | my ($class, $options) = @_; |
d5c30e52 |
110 | |
c32c2c61 |
111 | $class = ref($class) || $class; |
112 | |
aa4c3a8d |
113 | if ( my $metaclass_name = delete $options->{metaclass} ) { |
c32c2c61 |
114 | my $new_class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name ); |
d03bd989 |
115 | |
c32c2c61 |
116 | if ( $class ne $new_class ) { |
117 | if ( $new_class->can("interpolate_class") ) { |
aa4c3a8d |
118 | return $new_class->interpolate_class($options); |
c32c2c61 |
119 | } else { |
120 | $class = $new_class; |
121 | } |
122 | } |
d5c30e52 |
123 | } |
124 | |
c32c2c61 |
125 | my @traits; |
126 | |
aa4c3a8d |
127 | if (my $traits = $options->{traits}) { |
8974015d |
128 | my $i = 0; |
129 | while ($i < @$traits) { |
130 | my $trait = $traits->[$i++]; |
131 | next if ref($trait); # options to a trait we discarded |
132 | |
133 | $trait = Moose::Util::resolve_metatrait_alias(Attribute => $trait) |
134 | || $trait; |
135 | |
136 | next if $class->does($trait); |
137 | |
138 | push @traits, $trait; |
139 | |
140 | # are there options? |
141 | push @traits, $traits->[$i++] |
142 | if $traits->[$i] && ref($traits->[$i]); |
143 | } |
965743fb |
144 | |
145 | if (@traits) { |
c32c2c61 |
146 | my $anon_class = Moose::Meta::Class->create_anon_class( |
147 | superclasses => [ $class ], |
148 | roles => [ @traits ], |
149 | cache => 1, |
150 | ); |
151 | |
152 | $class = $anon_class->name; |
153 | } |
d5c30e52 |
154 | } |
c32c2c61 |
155 | |
156 | return ( wantarray ? ( $class, @traits ) : $class ); |
d5c30e52 |
157 | } |
158 | |
e606ae5f |
159 | # ... |
160 | |
161 | my @legal_options_for_inheritance = qw( |
d03bd989 |
162 | default coerce required |
163 | documentation lazy handles |
e606ae5f |
164 | builder type_constraint |
5f06098e |
165 | definition_context |
449559bf |
166 | lazy_build |
e606ae5f |
167 | ); |
168 | |
169 | sub legal_options_for_inheritance { @legal_options_for_inheritance } |
170 | |
171 | # NOTE/TODO |
d03bd989 |
172 | # This method *must* be able to handle |
173 | # Class::MOP::Attribute instances as |
174 | # well. Yes, I know that is wrong, but |
175 | # apparently we didn't realize it was |
176 | # doing that and now we have some code |
177 | # which is dependent on it. The real |
178 | # solution of course is to push this |
e606ae5f |
179 | # feature back up into Class::MOP::Attribute |
180 | # but I not right now, I am too lazy. |
d03bd989 |
181 | # However if you are reading this and |
182 | # looking for something to do,.. please |
e606ae5f |
183 | # be my guest. |
184 | # - stevan |
ce0e8d63 |
185 | sub clone_and_inherit_options { |
186 | my ($self, %options) = @_; |
d03bd989 |
187 | |
c32c2c61 |
188 | my %copy = %options; |
d03bd989 |
189 | |
ce0e8d63 |
190 | my %actual_options; |
d03bd989 |
191 | |
e606ae5f |
192 | # NOTE: |
193 | # we may want to extends a Class::MOP::Attribute |
d03bd989 |
194 | # in which case we need to be able to use the |
195 | # core set of legal options that have always |
e606ae5f |
196 | # been here. But we allows Moose::Meta::Attribute |
197 | # instances to changes them. |
198 | # - SL |
199 | my @legal_options = $self->can('legal_options_for_inheritance') |
200 | ? $self->legal_options_for_inheritance |
201 | : @legal_options_for_inheritance; |
d03bd989 |
202 | |
e606ae5f |
203 | foreach my $legal_option (@legal_options) { |
ce0e8d63 |
204 | if (exists $options{$legal_option}) { |
205 | $actual_options{$legal_option} = $options{$legal_option}; |
206 | delete $options{$legal_option}; |
207 | } |
d03bd989 |
208 | } |
26fbace8 |
209 | |
ce0e8d63 |
210 | if ($options{isa}) { |
211 | my $type_constraint; |
8de73ff1 |
212 | if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) { |
213 | $type_constraint = $options{isa}; |
214 | } |
215 | else { |
d40ce9d5 |
216 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa}); |
8de73ff1 |
217 | (defined $type_constraint) |
be05faea |
218 | || $self->throw_error("Could not find the type constraint '" . $options{isa} . "'", data => $options{isa}); |
8de73ff1 |
219 | } |
5e98d2b6 |
220 | |
8de73ff1 |
221 | $actual_options{type_constraint} = $type_constraint; |
ce0e8d63 |
222 | delete $options{isa}; |
223 | } |
d03bd989 |
224 | |
2ea379cb |
225 | if ($options{does}) { |
226 | my $type_constraint; |
227 | if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) { |
228 | $type_constraint = $options{does}; |
229 | } |
230 | else { |
d40ce9d5 |
231 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does}); |
2ea379cb |
232 | (defined $type_constraint) |
be05faea |
233 | || $self->throw_error("Could not find the type constraint '" . $options{does} . "'", data => $options{does}); |
2ea379cb |
234 | } |
235 | |
236 | $actual_options{type_constraint} = $type_constraint; |
237 | delete $options{does}; |
d03bd989 |
238 | } |
c32c2c61 |
239 | |
cbd141ca |
240 | # NOTE: |
d03bd989 |
241 | # this doesn't apply to Class::MOP::Attributes, |
cbd141ca |
242 | # so we can ignore it for them. |
243 | # - SL |
244 | if ($self->can('interpolate_class')) { |
aa4c3a8d |
245 | ( $actual_options{metaclass}, my @traits ) = $self->interpolate_class(\%options); |
c32c2c61 |
246 | |
cbd141ca |
247 | my %seen; |
248 | my @all_traits = grep { $seen{$_}++ } @{ $self->applied_traits || [] }, @traits; |
249 | $actual_options{traits} = \@all_traits if @all_traits; |
c32c2c61 |
250 | |
cbd141ca |
251 | delete @options{qw(metaclass traits)}; |
252 | } |
c32c2c61 |
253 | |
26fbace8 |
254 | (scalar keys %options == 0) |
be05faea |
255 | || $self->throw_error("Illegal inherited options => (" . (join ', ' => keys %options) . ")", data => \%options); |
c32c2c61 |
256 | |
257 | |
ce0e8d63 |
258 | $self->clone(%actual_options); |
1d768fb1 |
259 | } |
260 | |
c32c2c61 |
261 | sub clone { |
262 | my ( $self, %params ) = @_; |
263 | |
aa4c3a8d |
264 | my $class = delete $params{metaclass} || ref $self; |
c32c2c61 |
265 | |
db72153d |
266 | my ( @init, @non_init ); |
c32c2c61 |
267 | |
0772362a |
268 | foreach my $attr ( grep { $_->has_value($self) } Class::MOP::class_of($self)->get_all_attributes ) { |
db72153d |
269 | push @{ $attr->has_init_arg ? \@init : \@non_init }, $attr; |
270 | } |
c32c2c61 |
271 | |
db72153d |
272 | my %new_params = ( ( map { $_->init_arg => $_->get_value($self) } @init ), %params ); |
c32c2c61 |
273 | |
db72153d |
274 | my $name = delete $new_params{name}; |
c32c2c61 |
275 | |
db72153d |
276 | my $clone = $class->new($name, %new_params, __hack_no_process_options => 1 ); |
c32c2c61 |
277 | |
db72153d |
278 | foreach my $attr ( @non_init ) { |
279 | $attr->set_value($clone, $attr->get_value($self)); |
c32c2c61 |
280 | } |
db72153d |
281 | |
282 | return $clone; |
c32c2c61 |
283 | } |
284 | |
1d768fb1 |
285 | sub _process_options { |
286 | my ($class, $name, $options) = @_; |
8de73ff1 |
287 | |
f3c4e20e |
288 | if (exists $options->{is}) { |
21f1e231 |
289 | |
012fcbd1 |
290 | ### ------------------------- |
291 | ## is => ro, writer => _foo # turns into (reader => foo, writer => _foo) as before |
292 | ## is => rw, writer => _foo # turns into (reader => foo, writer => _foo) |
293 | ## is => rw, accessor => _foo # turns into (accessor => _foo) |
294 | ## is => ro, accessor => _foo # error, accesor is rw |
295 | ### ------------------------- |
d03bd989 |
296 | |
8de73ff1 |
297 | if ($options->{is} eq 'ro') { |
be05faea |
298 | $class->throw_error("Cannot define an accessor name on a read-only attribute, accessors are read/write", data => $options) |
21f1e231 |
299 | if exists $options->{accessor}; |
8de73ff1 |
300 | $options->{reader} ||= $name; |
8de73ff1 |
301 | } |
302 | elsif ($options->{is} eq 'rw') { |
21f1e231 |
303 | if ($options->{writer}) { |
304 | $options->{reader} ||= $name; |
305 | } |
306 | else { |
307 | $options->{accessor} ||= $name; |
308 | } |
8de73ff1 |
309 | } |
ccd4cff9 |
310 | elsif ($options->{is} eq 'bare') { |
311 | # do nothing, but don't complain (later) about missing methods |
312 | } |
8de73ff1 |
313 | else { |
e606ae5f |
314 | $class->throw_error("I do not understand this option (is => " . $options->{is} . ") on attribute ($name)", data => $options->{is}); |
8de73ff1 |
315 | } |
f3c4e20e |
316 | } |
8de73ff1 |
317 | |
f3c4e20e |
318 | if (exists $options->{isa}) { |
f3c4e20e |
319 | if (exists $options->{does}) { |
320 | if (eval { $options->{isa}->can('does') }) { |
321 | ($options->{isa}->does($options->{does})) |
e606ae5f |
322 | || $class->throw_error("Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)", data => $options); |
f3c4e20e |
323 | } |
324 | else { |
e606ae5f |
325 | $class->throw_error("Cannot have an isa option which cannot ->does() on attribute ($name)", data => $options); |
26fbace8 |
326 | } |
26fbace8 |
327 | } |
8de73ff1 |
328 | |
f3c4e20e |
329 | # allow for anon-subtypes here ... |
330 | if (blessed($options->{isa}) && $options->{isa}->isa('Moose::Meta::TypeConstraint')) { |
8de73ff1 |
331 | $options->{type_constraint} = $options->{isa}; |
332 | } |
333 | else { |
620db045 |
334 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa}); |
8de73ff1 |
335 | } |
f3c4e20e |
336 | } |
337 | elsif (exists $options->{does}) { |
338 | # allow for anon-subtypes here ... |
339 | if (blessed($options->{does}) && $options->{does}->isa('Moose::Meta::TypeConstraint')) { |
238b424d |
340 | $options->{type_constraint} = $options->{does}; |
8de73ff1 |
341 | } |
342 | else { |
620db045 |
343 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does}); |
8de73ff1 |
344 | } |
f3c4e20e |
345 | } |
8de73ff1 |
346 | |
f3c4e20e |
347 | if (exists $options->{coerce} && $options->{coerce}) { |
348 | (exists $options->{type_constraint}) |
e606ae5f |
349 | || $class->throw_error("You cannot have coercion without specifying a type constraint on attribute ($name)", data => $options); |
350 | $class->throw_error("You cannot have a weak reference to a coerced value on attribute ($name)", data => $options) |
8de73ff1 |
351 | if $options->{weak_ref}; |
f3c4e20e |
352 | } |
8de73ff1 |
353 | |
0b7df53c |
354 | if (exists $options->{trigger}) { |
21f1e231 |
355 | ('CODE' eq ref $options->{trigger}) |
e606ae5f |
356 | || $class->throw_error("Trigger must be a CODE ref on attribute ($name)", data => $options->{trigger}); |
0b7df53c |
357 | } |
358 | |
f3c4e20e |
359 | if (exists $options->{auto_deref} && $options->{auto_deref}) { |
360 | (exists $options->{type_constraint}) |
e606ae5f |
361 | || $class->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)", data => $options); |
f3c4e20e |
362 | ($options->{type_constraint}->is_a_type_of('ArrayRef') || |
8de73ff1 |
363 | $options->{type_constraint}->is_a_type_of('HashRef')) |
e606ae5f |
364 | || $class->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)", data => $options); |
f3c4e20e |
365 | } |
8de73ff1 |
366 | |
f3c4e20e |
367 | if (exists $options->{lazy_build} && $options->{lazy_build} == 1) { |
e606ae5f |
368 | $class->throw_error("You can not use lazy_build and default for the same attribute ($name)", data => $options) |
8de73ff1 |
369 | if exists $options->{default}; |
a6c84c69 |
370 | $options->{lazy} = 1; |
a6c84c69 |
371 | $options->{builder} ||= "_build_${name}"; |
372 | if ($name =~ /^_/) { |
f3c4e20e |
373 | $options->{clearer} ||= "_clear${name}"; |
374 | $options->{predicate} ||= "_has${name}"; |
d03bd989 |
375 | } |
a6c84c69 |
376 | else { |
f3c4e20e |
377 | $options->{clearer} ||= "clear_${name}"; |
378 | $options->{predicate} ||= "has_${name}"; |
26fbace8 |
379 | } |
f3c4e20e |
380 | } |
8de73ff1 |
381 | |
f3c4e20e |
382 | if (exists $options->{lazy} && $options->{lazy}) { |
9edba990 |
383 | (exists $options->{default} || defined $options->{builder} ) |
be05faea |
384 | || $class->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it", data => $options); |
f3c4e20e |
385 | } |
26fbace8 |
386 | |
9edba990 |
387 | if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) { |
be05faea |
388 | $class->throw_error("You cannot have a required attribute ($name) without a default, builder, or an init_arg", data => $options); |
9edba990 |
389 | } |
390 | |
78cd1d3b |
391 | } |
c0e30cf5 |
392 | |
d500266f |
393 | sub initialize_instance_slot { |
ddd0ec20 |
394 | my ($self, $meta_instance, $instance, $params) = @_; |
d500266f |
395 | my $init_arg = $self->init_arg(); |
396 | # try to fetch the init arg from the %params ... |
ddd0ec20 |
397 | |
26fbace8 |
398 | my $val; |
1ed0b94f |
399 | my $value_is_set; |
625d571f |
400 | if ( defined($init_arg) and exists $params->{$init_arg}) { |
d500266f |
401 | $val = $params->{$init_arg}; |
d03bd989 |
402 | $value_is_set = 1; |
d500266f |
403 | } |
404 | else { |
405 | # skip it if it's lazy |
406 | return if $self->is_lazy; |
407 | # and die if it's required and doesn't have a default value |
be05faea |
408 | $self->throw_error("Attribute (" . $self->name . ") is required", object => $instance, data => $params) |
26fbace8 |
409 | if $self->is_required && !$self->has_default && !$self->has_builder; |
ddd0ec20 |
410 | |
1ed0b94f |
411 | # if nothing was in the %params, we can use the |
412 | # attribute's default value (if it has one) |
413 | if ($self->has_default) { |
414 | $val = $self->default($instance); |
415 | $value_is_set = 1; |
d03bd989 |
416 | } |
a6c84c69 |
417 | elsif ($self->has_builder) { |
e606ae5f |
418 | $val = $self->_call_builder($instance); |
419 | $value_is_set = 1; |
a0748c37 |
420 | } |
26fbace8 |
421 | } |
422 | |
1ed0b94f |
423 | return unless $value_is_set; |
424 | |
9c9563c7 |
425 | $val = $self->_coerce_and_verify( $val, $instance ); |
ddd0ec20 |
426 | |
759e4e8f |
427 | $self->set_initial_value($instance, $val); |
26fbace8 |
428 | $meta_instance->weaken_slot_value($instance, $self->name) |
a6c84c69 |
429 | if ref $val && $self->is_weak_ref; |
d500266f |
430 | } |
431 | |
e606ae5f |
432 | sub _call_builder { |
433 | my ( $self, $instance ) = @_; |
434 | |
435 | my $builder = $self->builder(); |
436 | |
437 | return $instance->$builder() |
438 | if $instance->can( $self->builder ); |
439 | |
440 | $self->throw_error( blessed($instance) |
441 | . " does not support builder method '" |
442 | . $self->builder |
443 | . "' for attribute '" |
444 | . $self->name |
445 | . "'", |
446 | object => $instance, |
447 | ); |
448 | } |
449 | |
d617b644 |
450 | ## Slot management |
9e93dd19 |
451 | |
8abe9636 |
452 | # FIXME: |
d03bd989 |
453 | # this duplicates too much code from |
454 | # Class::MOP::Attribute, we need to |
8abe9636 |
455 | # refactor these bits eventually. |
456 | # - SL |
457 | sub _set_initial_slot_value { |
458 | my ($self, $meta_instance, $instance, $value) = @_; |
459 | |
460 | my $slot_name = $self->name; |
461 | |
462 | return $meta_instance->set_slot_value($instance, $slot_name, $value) |
463 | unless $self->has_initializer; |
464 | |
465 | my ($type_constraint, $can_coerce); |
466 | if ($self->has_type_constraint) { |
467 | $type_constraint = $self->type_constraint; |
468 | $can_coerce = ($self->should_coerce && $type_constraint->has_coercion); |
469 | } |
470 | |
471 | my $callback = sub { |
9c9563c7 |
472 | my $val = $self->_coerce_and_verify( shift, $instance );; |
473 | |
8abe9636 |
474 | $meta_instance->set_slot_value($instance, $slot_name, $val); |
475 | }; |
d03bd989 |
476 | |
8abe9636 |
477 | my $initializer = $self->initializer; |
478 | |
479 | # most things will just want to set a value, so make it first arg |
480 | $instance->$initializer($value, $callback, $self); |
481 | } |
482 | |
946289d1 |
483 | sub set_value { |
b6af66f8 |
484 | my ($self, $instance, @args) = @_; |
485 | my $value = $args[0]; |
26fbace8 |
486 | |
946289d1 |
487 | my $attr_name = $self->name; |
26fbace8 |
488 | |
b6af66f8 |
489 | if ($self->is_required and not @args) { |
be05faea |
490 | $self->throw_error("Attribute ($attr_name) is required", object => $instance); |
946289d1 |
491 | } |
26fbace8 |
492 | |
9c9563c7 |
493 | $value = $self->_coerce_and_verify( $value, $instance ); |
26fbace8 |
494 | |
946289d1 |
495 | my $meta_instance = Class::MOP::Class->initialize(blessed($instance)) |
496 | ->get_meta_instance; |
26fbace8 |
497 | |
498 | $meta_instance->set_slot_value($instance, $attr_name, $value); |
499 | |
946289d1 |
500 | if (ref $value && $self->is_weak_ref) { |
26fbace8 |
501 | $meta_instance->weaken_slot_value($instance, $attr_name); |
946289d1 |
502 | } |
26fbace8 |
503 | |
946289d1 |
504 | if ($self->has_trigger) { |
525129a5 |
505 | $self->trigger->($instance, $value); |
946289d1 |
506 | } |
507 | } |
508 | |
509 | sub get_value { |
510 | my ($self, $instance) = @_; |
26fbace8 |
511 | |
946289d1 |
512 | if ($self->is_lazy) { |
8de73ff1 |
513 | unless ($self->has_value($instance)) { |
e606ae5f |
514 | my $value; |
8de73ff1 |
515 | if ($self->has_default) { |
e606ae5f |
516 | $value = $self->default($instance); |
3f11800d |
517 | } elsif ( $self->has_builder ) { |
e606ae5f |
518 | $value = $self->_call_builder($instance); |
519 | } |
9c9563c7 |
520 | |
521 | $value = $self->_coerce_and_verify( $value, $instance ); |
522 | |
e606ae5f |
523 | $self->set_initial_value($instance, $value); |
8de73ff1 |
524 | } |
946289d1 |
525 | } |
26fbace8 |
526 | |
946289d1 |
527 | if ($self->should_auto_deref) { |
26fbace8 |
528 | |
946289d1 |
529 | my $type_constraint = $self->type_constraint; |
530 | |
531 | if ($type_constraint->is_a_type_of('ArrayRef')) { |
532 | my $rv = $self->SUPER::get_value($instance); |
533 | return unless defined $rv; |
534 | return wantarray ? @{ $rv } : $rv; |
26fbace8 |
535 | } |
946289d1 |
536 | elsif ($type_constraint->is_a_type_of('HashRef')) { |
537 | my $rv = $self->SUPER::get_value($instance); |
538 | return unless defined $rv; |
539 | return wantarray ? %{ $rv } : $rv; |
26fbace8 |
540 | } |
946289d1 |
541 | else { |
46cb090f |
542 | $self->throw_error("Can not auto de-reference the type constraint '" . $type_constraint->name . "'", object => $instance, type_constraint => $type_constraint); |
946289d1 |
543 | } |
26fbace8 |
544 | |
946289d1 |
545 | } |
546 | else { |
26fbace8 |
547 | |
946289d1 |
548 | return $self->SUPER::get_value($instance); |
26fbace8 |
549 | } |
946289d1 |
550 | } |
a15dff8d |
551 | |
26fbace8 |
552 | ## installing accessors |
c0e30cf5 |
553 | |
246bbeef |
554 | sub accessor_metaclass { 'Moose::Meta::Method::Accessor' } |
555 | |
556 | sub install_accessors { |
ae907ae0 |
557 | my $self = shift; |
246bbeef |
558 | $self->SUPER::install_accessors(@_); |
559 | $self->install_delegation if $self->has_handles; |
86cf196b |
560 | unless ( |
0bbd378f |
561 | @{ $self->associated_methods } |
86cf196b |
562 | || ($self->_is_metadata || '') eq 'bare' |
563 | ) { |
564 | Carp::cluck( |
8f4450f3 |
565 | 'Attribute (' . $self->name . ') of class ' |
566 | . $self->associated_class->name |
567 | . ' has no associated methods' |
86cf196b |
568 | . ' (did you mean to provide an "is" argument?)' |
569 | . "\n" |
570 | ) |
571 | } |
e606ae5f |
572 | return; |
573 | } |
26fbace8 |
574 | |
3b6e2290 |
575 | sub _process_accessors { |
576 | my $self = shift; |
577 | my ($type, $accessor, $generate_as_inline_methods) = @_; |
578 | $accessor = (keys %$accessor)[0] if (ref($accessor)||'') eq 'HASH'; |
99541dfd |
579 | my $method = $self->associated_class->get_method($accessor); |
580 | if ($method && !$method->isa('Class::MOP::Method::Accessor') |
581 | && (!$self->definition_context |
582 | || $method->package_name eq $self->definition_context->{package})) { |
3b6e2290 |
583 | Carp::cluck( |
584 | "You cannot overwrite a locally defined method ($accessor) with " |
585 | . "an accessor" |
586 | ); |
587 | } |
588 | $self->SUPER::_process_accessors(@_); |
589 | } |
590 | |
e1d6f0a3 |
591 | sub remove_accessors { |
592 | my $self = shift; |
593 | $self->SUPER::remove_accessors(@_); |
594 | $self->remove_delegation if $self->has_handles; |
595 | return; |
596 | } |
597 | |
e606ae5f |
598 | sub install_delegation { |
599 | my $self = shift; |
26fbace8 |
600 | |
e606ae5f |
601 | # NOTE: |
602 | # Here we canonicalize the 'handles' option |
603 | # this will sort out any details and always |
604 | # return an hash of methods which we want |
605 | # to delagate to, see that method for details |
606 | my %handles = $self->_canonicalize_handles; |
607 | |
e606ae5f |
608 | |
609 | # install the delegation ... |
610 | my $associated_class = $self->associated_class; |
611 | foreach my $handle (keys %handles) { |
612 | my $method_to_call = $handles{$handle}; |
613 | my $class_name = $associated_class->name; |
614 | my $name = "${class_name}::${handle}"; |
26fbace8 |
615 | |
452bac1b |
616 | (!$associated_class->has_method($handle)) |
cee532a1 |
617 | || $self->throw_error("You cannot overwrite a locally defined method ($handle) with a delegation", method_name => $handle); |
26fbace8 |
618 | |
e606ae5f |
619 | # NOTE: |
620 | # handles is not allowed to delegate |
621 | # any of these methods, as they will |
622 | # override the ones in your class, which |
623 | # is almost certainly not what you want. |
4fe78472 |
624 | |
e606ae5f |
625 | # FIXME warn when $handle was explicitly specified, but not if the source is a regex or something |
626 | #cluck("Not delegating method '$handle' because it is a core method") and |
627 | next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle); |
26fbace8 |
628 | |
46f7e6a5 |
629 | my $method = $self->_make_delegation_method($handle, $method_to_call); |
a05f85c1 |
630 | |
631 | $self->associated_class->add_method($method->name, $method); |
0bbd378f |
632 | $self->associate_method($method); |
d03bd989 |
633 | } |
452bac1b |
634 | } |
635 | |
e1d6f0a3 |
636 | sub remove_delegation { |
637 | my $self = shift; |
638 | my %handles = $self->_canonicalize_handles; |
639 | my $associated_class = $self->associated_class; |
640 | foreach my $handle (keys %handles) { |
641 | $self->associated_class->remove_method($handle); |
642 | } |
643 | } |
644 | |
98aae381 |
645 | # private methods to help delegation ... |
646 | |
452bac1b |
647 | sub _canonicalize_handles { |
648 | my $self = shift; |
649 | my $handles = $self->handles; |
c84f324f |
650 | if (my $handle_type = ref($handles)) { |
651 | if ($handle_type eq 'HASH') { |
652 | return %{$handles}; |
653 | } |
654 | elsif ($handle_type eq 'ARRAY') { |
655 | return map { $_ => $_ } @{$handles}; |
656 | } |
657 | elsif ($handle_type eq 'Regexp') { |
658 | ($self->has_type_constraint) |
0286711b |
659 | || $self->throw_error("Cannot delegate methods based on a Regexp without a type constraint (isa)", data => $handles); |
26fbace8 |
660 | return map { ($_ => $_) } |
c84f324f |
661 | grep { /$handles/ } $self->_get_delegate_method_list; |
662 | } |
663 | elsif ($handle_type eq 'CODE') { |
664 | return $handles->($self, $self->_find_delegate_metaclass); |
665 | } |
6cbf4a23 |
666 | elsif (blessed($handles) && $handles->isa('Moose::Meta::TypeConstraint::DuckType')) { |
667 | return map { $_ => $_ } @{ $handles->methods }; |
668 | } |
c84f324f |
669 | else { |
be05faea |
670 | $self->throw_error("Unable to canonicalize the 'handles' option with $handles", data => $handles); |
c84f324f |
671 | } |
452bac1b |
672 | } |
673 | else { |
c8d9f1e2 |
674 | Class::MOP::load_class($handles); |
675 | my $role_meta = Class::MOP::class_of($handles); |
c84f324f |
676 | |
677 | (blessed $role_meta && $role_meta->isa('Moose::Meta::Role')) |
425ca605 |
678 | || $self->throw_error("Unable to canonicalize the 'handles' option with $handles because its metaclass is not a Moose::Meta::Role", data => $handles); |
d03bd989 |
679 | |
c84f324f |
680 | return map { $_ => $_ } ( |
26fbace8 |
681 | $role_meta->get_method_list, |
b07a4e6d |
682 | map { $_->name } $role_meta->get_required_method_list, |
c84f324f |
683 | ); |
452bac1b |
684 | } |
685 | } |
686 | |
687 | sub _find_delegate_metaclass { |
688 | my $self = shift; |
98aae381 |
689 | if (my $class = $self->_isa_metadata) { |
9031e2c4 |
690 | # we might be dealing with a non-Moose class, |
691 | # and need to make our own metaclass. if there's |
692 | # already a metaclass, it will be returned |
452bac1b |
693 | return Moose::Meta::Class->initialize($class); |
694 | } |
98aae381 |
695 | elsif (my $role = $self->_does_metadata) { |
91e6653b |
696 | return Class::MOP::class_of($role); |
452bac1b |
697 | } |
698 | else { |
be05faea |
699 | $self->throw_error("Cannot find delegate metaclass for attribute " . $self->name); |
452bac1b |
700 | } |
701 | } |
702 | |
703 | sub _get_delegate_method_list { |
704 | my $self = shift; |
705 | my $meta = $self->_find_delegate_metaclass; |
706 | if ($meta->isa('Class::MOP::Class')) { |
e606ae5f |
707 | return map { $_->name } # NOTE: !never! delegate &meta |
708 | grep { $_->package_name ne 'Moose::Object' && $_->name ne 'meta' } |
709 | $meta->get_all_methods; |
452bac1b |
710 | } |
711 | elsif ($meta->isa('Moose::Meta::Role')) { |
26fbace8 |
712 | return $meta->get_method_list; |
452bac1b |
713 | } |
714 | else { |
be05faea |
715 | $self->throw_error("Unable to recognize the delegate metaclass '$meta'", data => $meta); |
452bac1b |
716 | } |
717 | } |
718 | |
bd1226e2 |
719 | sub delegation_metaclass { 'Moose::Meta::Method::Delegation' } |
720 | |
a05f85c1 |
721 | sub _make_delegation_method { |
46f7e6a5 |
722 | my ( $self, $handle_name, $method_to_call ) = @_; |
a05f85c1 |
723 | |
724 | my $method_body; |
725 | |
46f7e6a5 |
726 | $method_body = $method_to_call |
727 | if 'CODE' eq ref($method_to_call); |
a05f85c1 |
728 | |
bd1226e2 |
729 | return $self->delegation_metaclass->new( |
46f7e6a5 |
730 | name => $handle_name, |
731 | package_name => $self->associated_class->name, |
732 | attribute => $self, |
733 | delegate_to_method => $method_to_call, |
a05f85c1 |
734 | ); |
735 | } |
736 | |
9c9563c7 |
737 | sub _coerce_and_verify { |
738 | my $self = shift; |
739 | my $val = shift; |
740 | my $instance = shift; |
741 | |
742 | return $val unless $self->has_type_constraint; |
743 | |
744 | my $type_constraint = $self->type_constraint; |
745 | if ($self->should_coerce && $type_constraint->has_coercion) { |
746 | $val = $type_constraint->coerce($val); |
747 | } |
748 | |
749 | $self->verify_against_type_constraint($val, instance => $instance); |
750 | |
751 | return $val; |
752 | } |
753 | |
5755a9b2 |
754 | sub verify_against_type_constraint { |
2b86e02b |
755 | my $self = shift; |
756 | my $val = shift; |
757 | |
758 | return 1 if !$self->has_type_constraint; |
759 | |
760 | my $type_constraint = $self->type_constraint; |
761 | |
762 | $type_constraint->check($val) |
763 | || $self->throw_error("Attribute (" |
764 | . $self->name |
765 | . ") does not pass the type constraint because: " |
766 | . $type_constraint->get_message($val), data => $val, @_); |
767 | } |
768 | |
21f1e231 |
769 | package Moose::Meta::Attribute::Custom::Moose; |
770 | sub register_implementation { 'Moose::Meta::Attribute' } |
771 | |
c0e30cf5 |
772 | 1; |
773 | |
774 | __END__ |
775 | |
776 | =pod |
777 | |
778 | =head1 NAME |
779 | |
6ba6d68c |
780 | Moose::Meta::Attribute - The Moose attribute metaclass |
c0e30cf5 |
781 | |
782 | =head1 DESCRIPTION |
783 | |
93a708fd |
784 | This class is a subclass of L<Class::MOP::Attribute> that provides |
785 | additional Moose-specific functionality. |
6ba6d68c |
786 | |
7854b409 |
787 | To really understand this class, you will need to start with the |
788 | L<Class::MOP::Attribute> documentation. This class can be understood |
789 | as a set of additional features on top of the basic feature provided |
790 | by that parent class. |
e522431d |
791 | |
d4b1449e |
792 | =head1 INHERITANCE |
793 | |
794 | C<Moose::Meta::Attribute> is a subclass of L<Class::MOP::Attribute>. |
795 | |
c0e30cf5 |
796 | =head1 METHODS |
797 | |
93a708fd |
798 | Many of the documented below override methods in |
799 | L<Class::MOP::Attribute> and add Moose specific features. |
6ba6d68c |
800 | |
93a708fd |
801 | =head2 Creation |
6ba6d68c |
802 | |
c0e30cf5 |
803 | =over 4 |
804 | |
93a708fd |
805 | =item B<< Moose::Meta::Attribute->new(%options) >> |
c0e30cf5 |
806 | |
93a708fd |
807 | This method overrides the L<Class::MOP::Attribute> constructor. |
c32c2c61 |
808 | |
93a708fd |
809 | Many of the options below are described in more detail in the |
810 | L<Moose::Manual::Attributes> document. |
6e2840b7 |
811 | |
93a708fd |
812 | It adds the following options to the constructor: |
d500266f |
813 | |
93a708fd |
814 | =over 8 |
452bac1b |
815 | |
996b8c8d |
816 | =item * is => 'ro', 'rw', 'bare' |
e1d6f0a3 |
817 | |
93a708fd |
818 | This provides a shorthand for specifying the C<reader>, C<writer>, or |
819 | C<accessor> names. If the attribute is read-only ('ro') then it will |
820 | have a C<reader> method with the same attribute as the name. |
e606ae5f |
821 | |
93a708fd |
822 | If it is read-write ('rw') then it will have an C<accessor> method |
823 | with the same name. If you provide an explicit C<writer> for a |
824 | read-write attribute, then you will have a C<reader> with the same |
825 | name as the attribute, and a C<writer> with the name you provided. |
e1d6f0a3 |
826 | |
996b8c8d |
827 | Use 'bare' when you are deliberately not installing any methods |
828 | (accessor, reader, etc.) associated with this attribute; otherwise, |
829 | Moose will issue a deprecation warning when this attribute is added to a |
830 | metaclass. |
831 | |
93a708fd |
832 | =item * isa => $type |
39b3bc94 |
833 | |
93a708fd |
834 | This option accepts a type. The type can be a string, which should be |
835 | a type name. If the type name is unknown, it is assumed to be a class |
836 | name. |
837 | |
838 | This option can also accept a L<Moose::Meta::TypeConstraint> object. |
839 | |
840 | If you I<also> provide a C<does> option, then your C<isa> option must |
841 | be a class name, and that class must do the role specified with |
842 | C<does>. |
843 | |
844 | =item * does => $role |
845 | |
846 | This is short-hand for saying that the attribute's type must be an |
847 | object which does the named role. |
848 | |
849 | =item * coerce => $bool |
850 | |
851 | This option is only valid for objects with a type constraint |
852 | (C<isa>). If this is true, then coercions will be applied whenever |
853 | this attribute is set. |
854 | |
855 | You can make both this and the C<weak_ref> option true. |
856 | |
857 | =item * trigger => $sub |
858 | |
859 | This option accepts a subroutine reference, which will be called after |
860 | the attribute is set. |
861 | |
862 | =item * required => $bool |
863 | |
864 | An attribute which is required must be provided to the constructor. An |
865 | attribute which is required can also have a C<default> or C<builder>, |
36741534 |
866 | which will satisfy its required-ness. |
93a708fd |
867 | |
868 | A required attribute must have a C<default>, C<builder> or a |
869 | non-C<undef> C<init_arg> |
870 | |
871 | =item * lazy => $bool |
872 | |
873 | A lazy attribute must have a C<default> or C<builder>. When an |
874 | attribute is lazy, the default value will not be calculated until the |
875 | attribute is read. |
876 | |
877 | =item * weak_ref => $bool |
878 | |
879 | If this is true, the attribute's value will be stored as a weak |
880 | reference. |
881 | |
882 | =item * auto_deref => $bool |
883 | |
884 | If this is true, then the reader will dereference the value when it is |
885 | called. The attribute must have a type constraint which defines the |
886 | attribute as an array or hash reference. |
887 | |
888 | =item * lazy_build => $bool |
889 | |
890 | Setting this to true makes the attribute lazy and provides a number of |
891 | default methods. |
892 | |
893 | has 'size' => ( |
894 | is => 'ro', |
895 | lazy_build => 1, |
896 | ); |
897 | |
898 | is equivalent to this: |
899 | |
900 | has 'size' => ( |
901 | is => 'ro', |
902 | lazy => 1, |
903 | builder => '_build_size', |
904 | clearer => 'clear_size', |
905 | predicate => 'has_size', |
906 | ); |
907 | |
908 | =item * documentation |
909 | |
910 | An arbitrary string that can be retrieved later by calling C<< |
911 | $attr->documentation >>. |
912 | |
913 | =back |
914 | |
915 | =item B<< $attr->clone(%options) >> |
916 | |
917 | This creates a new attribute based on attribute being cloned. You must |
918 | supply a C<name> option to provide a new name for the attribute. |
919 | |
920 | The C<%options> can only specify options handled by |
921 | L<Class::MOP::Attribute>. |
922 | |
36741534 |
923 | =back |
924 | |
93a708fd |
925 | =head2 Value management |
926 | |
36741534 |
927 | =over 4 |
928 | |
93a708fd |
929 | =item B<< $attr->initialize_instance_slot($meta_instance, $instance, $params) >> |
930 | |
931 | This method is used internally to initialize the attribute's slot in |
932 | the object C<$instance>. |
933 | |
934 | This overrides the L<Class::MOP::Attribute> method to handle lazy |
935 | attributes, weak references, and type constraints. |
bd1226e2 |
936 | |
946289d1 |
937 | =item B<get_value> |
938 | |
939 | =item B<set_value> |
940 | |
6549b0d1 |
941 | eval { $point->meta->get_attribute('x')->set_value($point, 'forty-two') }; |
bcbaa845 |
942 | if($@) { |
943 | print "Oops: $@\n"; |
944 | } |
945 | |
6549b0d1 |
946 | I<Attribute (x) does not pass the type constraint (Int) with 'forty-two'> |
bcbaa845 |
947 | |
948 | Before setting the value, a check is made on the type constraint of |
949 | the attribute, if it has one, to see if the value passes it. If the |
46cb090f |
950 | value fails to pass, the set operation dies with a L<throw_error>. |
bcbaa845 |
951 | |
952 | Any coercion to convert values is done before checking the type constraint. |
953 | |
954 | To check a value against a type constraint before setting it, fetch the |
ec00fa75 |
955 | attribute instance using L<Class::MOP::Class/find_attribute_by_name>, |
bcbaa845 |
956 | fetch the type_constraint from the attribute using L<Moose::Meta::Attribute/type_constraint> |
e606ae5f |
957 | and call L<Moose::Meta::TypeConstraint/check>. See L<Moose::Cookbook::Basics::Recipe4> |
bcbaa845 |
958 | for an example. |
959 | |
a15dff8d |
960 | =back |
961 | |
93a708fd |
962 | =head2 Attribute Accessor generation |
6ba6d68c |
963 | |
a15dff8d |
964 | =over 4 |
965 | |
93a708fd |
966 | =item B<< $attr->install_accessors >> |
be05faea |
967 | |
93a708fd |
968 | This method overrides the parent to also install delegation methods. |
be05faea |
969 | |
7a582117 |
970 | If, after installing all methods, the attribute object has no associated |
971 | methods, it throws an error unless C<< is => 'bare' >> was passed to the |
972 | attribute constructor. (Trying to add an attribute that has no associated |
973 | methods is almost always an error.) |
974 | |
36741534 |
975 | =item B<< $attr->remove_accessors >> |
d5c30e52 |
976 | |
93a708fd |
977 | This method overrides the parent to also remove delegation methods. |
d5c30e52 |
978 | |
93a708fd |
979 | =item B<< $attr->install_delegation >> |
980 | |
981 | This method adds its delegation methods to the attribute's associated |
982 | class, if it has any to add. |
983 | |
984 | =item B<< $attr->remove_delegation >> |
985 | |
986 | This method remove its delegation methods from the attribute's |
987 | associated class. |
d5c30e52 |
988 | |
93a708fd |
989 | =item B<< $attr->accessor_metaclass >> |
9e93dd19 |
990 | |
93a708fd |
991 | Returns the accessor metaclass name, which defaults to |
992 | L<Moose::Meta::Method::Accessor>. |
993 | |
994 | =item B<< $attr->delegation_metaclass >> |
995 | |
996 | Returns the delegation metaclass name, which defaults to |
997 | L<Moose::Meta::Method::Delegation>. |
998 | |
999 | =back |
1000 | |
1001 | =head2 Additional Moose features |
1002 | |
1003 | These methods are not found in the superclass. They support features |
1004 | provided by Moose. |
1005 | |
36741534 |
1006 | =over 4 |
1007 | |
93a708fd |
1008 | =item B<< $attr->does($role) >> |
1009 | |
1010 | This indicates whether the I<attribute itself> does the given |
36741534 |
1011 | role. The role can be given as a full class name, or as a resolvable |
93a708fd |
1012 | trait name. |
1013 | |
1014 | Note that this checks the attribute itself, not its type constraint, |
1015 | so it is checking the attribute's metaclass and any traits applied to |
1016 | the attribute. |
1017 | |
1018 | =item B<< Moose::Meta::Class->interpolate_class_and_new($name, %options) >> |
1019 | |
1020 | This is an alternate constructor that handles the C<metaclass> and |
1021 | C<traits> options. |
9e93dd19 |
1022 | |
93a708fd |
1023 | Effectively, this method is a factory that finds or creates the |
36741534 |
1024 | appropriate class for the given C<metaclass> and/or C<traits>. |
e606ae5f |
1025 | |
93a708fd |
1026 | Once it has the appropriate class, it will call C<< $class->new($name, |
1027 | %options) >> on that class. |
e606ae5f |
1028 | |
93a708fd |
1029 | =item B<< $attr->clone_and_inherit_options(%options) >> |
a15dff8d |
1030 | |
93a708fd |
1031 | This method supports the C<has '+foo'> feature. It does various bits |
1032 | of processing on the supplied C<%options> before ultimately calling |
1033 | the C<clone> method. |
6ba6d68c |
1034 | |
93a708fd |
1035 | One of its main tasks is to make sure that the C<%options> provided |
1036 | only includes the options returned by the |
1037 | C<legal_options_for_inheritance> method. |
a15dff8d |
1038 | |
93a708fd |
1039 | =item B<< $attr->legal_options_for_inheritance >> |
a15dff8d |
1040 | |
93a708fd |
1041 | This returns a whitelist of options that can be overridden in a |
1042 | subclass's attribute definition. |
2b86e02b |
1043 | |
93a708fd |
1044 | This exists to allow a custom metaclass to change or add to the list |
1045 | of options which can be changed. |
2b86e02b |
1046 | |
93a708fd |
1047 | =item B<< $attr->type_constraint >> |
452bac1b |
1048 | |
93a708fd |
1049 | Returns the L<Moose::Meta::TypeConstraint> object for this attribute, |
1050 | if it has one. |
452bac1b |
1051 | |
93a708fd |
1052 | =item B<< $attr->has_type_constraint >> |
452bac1b |
1053 | |
93a708fd |
1054 | Returns true if this attribute has a type constraint. |
452bac1b |
1055 | |
93a708fd |
1056 | =item B<< $attr->verify_against_type_constraint($value) >> |
a15dff8d |
1057 | |
93a708fd |
1058 | Given a value, this method returns true if the value is valid for the |
1059 | attribute's type constraint. If the value is not valid, it throws an |
1060 | error. |
4b598ea3 |
1061 | |
93a708fd |
1062 | =item B<< $attr->handles >> |
ca01a97b |
1063 | |
93a708fd |
1064 | This returns the value of the C<handles> option passed to the |
1065 | constructor. |
ca01a97b |
1066 | |
93a708fd |
1067 | =item B<< $attr->has_handles >> |
ca01a97b |
1068 | |
93a708fd |
1069 | Returns true if this attribute performs delegation. |
ca01a97b |
1070 | |
93a708fd |
1071 | =item B<< $attr->is_weak_ref >> |
26fbace8 |
1072 | |
93a708fd |
1073 | Returns true if this attribute stores its value as a weak reference. |
26fbace8 |
1074 | |
93a708fd |
1075 | =item B<< $attr->is_required >> |
26fbace8 |
1076 | |
93a708fd |
1077 | Returns true if this attribute is required to have a value. |
26fbace8 |
1078 | |
93a708fd |
1079 | =item B<< $attr->is_lazy >> |
58f85113 |
1080 | |
93a708fd |
1081 | Returns true if this attribute is lazy. |
26fbace8 |
1082 | |
93a708fd |
1083 | =item B<< $attr->is_lazy_build >> |
ca01a97b |
1084 | |
93a708fd |
1085 | Returns true if the C<lazy_build> option was true when passed to the |
1086 | constructor. |
4b598ea3 |
1087 | |
93a708fd |
1088 | =item B<< $attr->should_coerce >> |
6ba6d68c |
1089 | |
93a708fd |
1090 | Returns true if the C<coerce> option passed to the constructor was |
1091 | true. |
536f0b17 |
1092 | |
93a708fd |
1093 | =item B<< $attr->should_auto_deref >> |
536f0b17 |
1094 | |
93a708fd |
1095 | Returns true if the C<auto_deref> option passed to the constructor was |
1096 | true. |
536f0b17 |
1097 | |
93a708fd |
1098 | =item B<< $attr->trigger >> |
8c9d74e7 |
1099 | |
93a708fd |
1100 | This is the subroutine reference that was in the C<trigger> option |
1101 | passed to the constructor, if any. |
02a0fb52 |
1102 | |
36741534 |
1103 | =item B<< $attr->has_trigger >> |
8c9d74e7 |
1104 | |
93a708fd |
1105 | Returns true if this attribute has a trigger set. |
02a0fb52 |
1106 | |
93a708fd |
1107 | =item B<< $attr->documentation >> |
ddbdc0cb |
1108 | |
93a708fd |
1109 | Returns the value that was in the C<documentation> option passed to |
1110 | the constructor, if any. |
ddbdc0cb |
1111 | |
93a708fd |
1112 | =item B<< $attr->has_documentation >> |
ddbdc0cb |
1113 | |
93a708fd |
1114 | Returns true if this attribute has any documentation. |
ddbdc0cb |
1115 | |
93a708fd |
1116 | =item B<< $attr->applied_traits >> |
88f23977 |
1117 | |
93a708fd |
1118 | This returns an array reference of all the traits which were applied |
1119 | to this attribute. If none were applied, this returns C<undef>. |
88f23977 |
1120 | |
93a708fd |
1121 | =item B<< $attr->has_applied_traits >> |
88f23977 |
1122 | |
93a708fd |
1123 | Returns true if this attribute has any traits applied. |
88f23977 |
1124 | |
c0e30cf5 |
1125 | =back |
1126 | |
1127 | =head1 BUGS |
1128 | |
26fbace8 |
1129 | All complex software has bugs lurking in it, and this module is no |
c0e30cf5 |
1130 | exception. If you find a bug please either email me, or add the bug |
1131 | to cpan-RT. |
1132 | |
c0e30cf5 |
1133 | =head1 AUTHOR |
1134 | |
1135 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
1136 | |
98aae381 |
1137 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
1138 | |
c0e30cf5 |
1139 | =head1 COPYRIGHT AND LICENSE |
1140 | |
2840a3b2 |
1141 | Copyright 2006-2009 by Infinity Interactive, Inc. |
c0e30cf5 |
1142 | |
1143 | L<http://www.iinteractive.com> |
1144 | |
1145 | This library is free software; you can redistribute it and/or modify |
26fbace8 |
1146 | it under the same terms as Perl itself. |
c0e30cf5 |
1147 | |
8a7a9c53 |
1148 | =cut |