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'; |
fe11f190 |
8 | use List::MoreUtils 'any'; |
1454efcc |
9 | use Try::Tiny; |
a909a4df |
10 | use overload (); |
a15dff8d |
11 | |
2e7576bd |
12 | our $VERSION = '0.96'; |
d44714be |
13 | our $AUTHORITY = 'cpan:STEVAN'; |
78cd1d3b |
14 | |
8ee73eeb |
15 | use Moose::Meta::Method::Accessor; |
a05f85c1 |
16 | use Moose::Meta::Method::Delegation; |
d5c30e52 |
17 | use Moose::Util (); |
a3c7e2fe |
18 | use Moose::Util::TypeConstraints (); |
bc1e29b5 |
19 | |
f785aad8 |
20 | use base 'Class::MOP::Attribute', 'Moose::Meta::Mixin::AttributeCore'; |
c0e30cf5 |
21 | |
82a5b1a7 |
22 | __PACKAGE__->meta->add_attribute('traits' => ( |
23 | reader => 'applied_traits', |
24 | predicate => 'has_applied_traits', |
25 | )); |
82168dbb |
26 | |
d03bd989 |
27 | # we need to have a ->does method in here to |
28 | # more easily support traits, and the introspection |
0db4f1d7 |
29 | # of those traits. We extend the does check to look |
30 | # for metatrait aliases. |
31 | sub does { |
32 | my ($self, $role_name) = @_; |
1454efcc |
33 | my $name = try { |
0db4f1d7 |
34 | Moose::Util::resolve_metatrait_alias(Attribute => $role_name) |
35 | }; |
36 | return 0 if !defined($name); # failed to load class |
e8895723 |
37 | return $self->Moose::Object::does($name); |
0db4f1d7 |
38 | } |
587e457d |
39 | |
be05faea |
40 | sub throw_error { |
41 | my $self = shift; |
42 | my $class = ( ref $self && $self->associated_class ) || "Moose::Meta::Class"; |
43 | unshift @_, "message" if @_ % 2 == 1; |
44 | unshift @_, attr => $self if ref $self; |
45 | unshift @_, $class; |
18748ad6 |
46 | my $handler = $class->can("throw_error"); # to avoid incrementing depth by 1 |
47 | goto $handler; |
be05faea |
48 | } |
49 | |
78cd1d3b |
50 | sub new { |
f3c4e20e |
51 | my ($class, $name, %options) = @_; |
c32c2c61 |
52 | $class->_process_options($name, \%options) unless $options{__hack_no_process_options}; # used from clone()... YECHKKK FIXME ICKY YUCK GROSS |
aa4c3a8d |
53 | |
54 | delete $options{__hack_no_process_options}; |
55 | |
56 | my %attrs = |
57 | ( map { $_ => 1 } |
58 | grep { defined } |
59 | map { $_->init_arg() } |
60 | $class->meta()->get_all_attributes() |
61 | ); |
62 | |
63 | my @bad = sort grep { ! $attrs{$_} } keys %options; |
64 | |
65 | if (@bad) |
66 | { |
67 | Carp::cluck "Found unknown argument(s) passed to '$name' attribute constructor in '$class': @bad"; |
68 | } |
69 | |
f3c4e20e |
70 | return $class->SUPER::new($name, %options); |
1d768fb1 |
71 | } |
72 | |
d5c30e52 |
73 | sub interpolate_class_and_new { |
aa4c3a8d |
74 | my ($class, $name, %args) = @_; |
d5c30e52 |
75 | |
aa4c3a8d |
76 | my ( $new_class, @traits ) = $class->interpolate_class(\%args); |
d03bd989 |
77 | |
aa4c3a8d |
78 | $new_class->new($name, %args, ( scalar(@traits) ? ( traits => \@traits ) : () ) ); |
d5c30e52 |
79 | } |
80 | |
81 | sub interpolate_class { |
aa4c3a8d |
82 | my ($class, $options) = @_; |
d5c30e52 |
83 | |
c32c2c61 |
84 | $class = ref($class) || $class; |
85 | |
aa4c3a8d |
86 | if ( my $metaclass_name = delete $options->{metaclass} ) { |
c32c2c61 |
87 | my $new_class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name ); |
d03bd989 |
88 | |
c32c2c61 |
89 | if ( $class ne $new_class ) { |
90 | if ( $new_class->can("interpolate_class") ) { |
aa4c3a8d |
91 | return $new_class->interpolate_class($options); |
c32c2c61 |
92 | } else { |
93 | $class = $new_class; |
94 | } |
95 | } |
d5c30e52 |
96 | } |
97 | |
c32c2c61 |
98 | my @traits; |
99 | |
aa4c3a8d |
100 | if (my $traits = $options->{traits}) { |
8974015d |
101 | my $i = 0; |
102 | while ($i < @$traits) { |
103 | my $trait = $traits->[$i++]; |
104 | next if ref($trait); # options to a trait we discarded |
105 | |
106 | $trait = Moose::Util::resolve_metatrait_alias(Attribute => $trait) |
107 | || $trait; |
108 | |
109 | next if $class->does($trait); |
110 | |
111 | push @traits, $trait; |
112 | |
113 | # are there options? |
114 | push @traits, $traits->[$i++] |
115 | if $traits->[$i] && ref($traits->[$i]); |
116 | } |
965743fb |
117 | |
118 | if (@traits) { |
c32c2c61 |
119 | my $anon_class = Moose::Meta::Class->create_anon_class( |
120 | superclasses => [ $class ], |
121 | roles => [ @traits ], |
122 | cache => 1, |
123 | ); |
124 | |
125 | $class = $anon_class->name; |
126 | } |
d5c30e52 |
127 | } |
c32c2c61 |
128 | |
129 | return ( wantarray ? ( $class, @traits ) : $class ); |
d5c30e52 |
130 | } |
131 | |
e606ae5f |
132 | # ... |
133 | |
134 | my @legal_options_for_inheritance = qw( |
d03bd989 |
135 | default coerce required |
136 | documentation lazy handles |
e606ae5f |
137 | builder type_constraint |
5f06098e |
138 | definition_context |
d7e7abd9 |
139 | lazy_build weak_ref |
e606ae5f |
140 | ); |
141 | |
142 | sub legal_options_for_inheritance { @legal_options_for_inheritance } |
143 | |
144 | # NOTE/TODO |
d03bd989 |
145 | # This method *must* be able to handle |
146 | # Class::MOP::Attribute instances as |
147 | # well. Yes, I know that is wrong, but |
148 | # apparently we didn't realize it was |
149 | # doing that and now we have some code |
150 | # which is dependent on it. The real |
151 | # solution of course is to push this |
e606ae5f |
152 | # feature back up into Class::MOP::Attribute |
153 | # but I not right now, I am too lazy. |
d03bd989 |
154 | # However if you are reading this and |
155 | # looking for something to do,.. please |
e606ae5f |
156 | # be my guest. |
157 | # - stevan |
ce0e8d63 |
158 | sub clone_and_inherit_options { |
159 | my ($self, %options) = @_; |
d03bd989 |
160 | |
c32c2c61 |
161 | my %copy = %options; |
d03bd989 |
162 | |
ce0e8d63 |
163 | my %actual_options; |
d03bd989 |
164 | |
e606ae5f |
165 | # NOTE: |
166 | # we may want to extends a Class::MOP::Attribute |
d03bd989 |
167 | # in which case we need to be able to use the |
168 | # core set of legal options that have always |
e606ae5f |
169 | # been here. But we allows Moose::Meta::Attribute |
170 | # instances to changes them. |
171 | # - SL |
172 | my @legal_options = $self->can('legal_options_for_inheritance') |
173 | ? $self->legal_options_for_inheritance |
174 | : @legal_options_for_inheritance; |
d03bd989 |
175 | |
e606ae5f |
176 | foreach my $legal_option (@legal_options) { |
ce0e8d63 |
177 | if (exists $options{$legal_option}) { |
178 | $actual_options{$legal_option} = $options{$legal_option}; |
179 | delete $options{$legal_option}; |
180 | } |
d03bd989 |
181 | } |
26fbace8 |
182 | |
ce0e8d63 |
183 | if ($options{isa}) { |
184 | my $type_constraint; |
8de73ff1 |
185 | if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) { |
186 | $type_constraint = $options{isa}; |
187 | } |
188 | else { |
d40ce9d5 |
189 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa}); |
8de73ff1 |
190 | (defined $type_constraint) |
be05faea |
191 | || $self->throw_error("Could not find the type constraint '" . $options{isa} . "'", data => $options{isa}); |
8de73ff1 |
192 | } |
5e98d2b6 |
193 | |
8de73ff1 |
194 | $actual_options{type_constraint} = $type_constraint; |
ce0e8d63 |
195 | delete $options{isa}; |
196 | } |
d03bd989 |
197 | |
2ea379cb |
198 | if ($options{does}) { |
199 | my $type_constraint; |
200 | if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) { |
201 | $type_constraint = $options{does}; |
202 | } |
203 | else { |
d40ce9d5 |
204 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does}); |
2ea379cb |
205 | (defined $type_constraint) |
be05faea |
206 | || $self->throw_error("Could not find the type constraint '" . $options{does} . "'", data => $options{does}); |
2ea379cb |
207 | } |
208 | |
209 | $actual_options{type_constraint} = $type_constraint; |
210 | delete $options{does}; |
d03bd989 |
211 | } |
c32c2c61 |
212 | |
cbd141ca |
213 | # NOTE: |
d03bd989 |
214 | # this doesn't apply to Class::MOP::Attributes, |
cbd141ca |
215 | # so we can ignore it for them. |
216 | # - SL |
217 | if ($self->can('interpolate_class')) { |
aa4c3a8d |
218 | ( $actual_options{metaclass}, my @traits ) = $self->interpolate_class(\%options); |
c32c2c61 |
219 | |
cbd141ca |
220 | my %seen; |
221 | my @all_traits = grep { $seen{$_}++ } @{ $self->applied_traits || [] }, @traits; |
222 | $actual_options{traits} = \@all_traits if @all_traits; |
c32c2c61 |
223 | |
cbd141ca |
224 | delete @options{qw(metaclass traits)}; |
225 | } |
c32c2c61 |
226 | |
26fbace8 |
227 | (scalar keys %options == 0) |
be05faea |
228 | || $self->throw_error("Illegal inherited options => (" . (join ', ' => keys %options) . ")", data => \%options); |
c32c2c61 |
229 | |
230 | |
ce0e8d63 |
231 | $self->clone(%actual_options); |
1d768fb1 |
232 | } |
233 | |
c32c2c61 |
234 | sub clone { |
235 | my ( $self, %params ) = @_; |
236 | |
aa4c3a8d |
237 | my $class = delete $params{metaclass} || ref $self; |
c32c2c61 |
238 | |
db72153d |
239 | my ( @init, @non_init ); |
c32c2c61 |
240 | |
0772362a |
241 | foreach my $attr ( grep { $_->has_value($self) } Class::MOP::class_of($self)->get_all_attributes ) { |
db72153d |
242 | push @{ $attr->has_init_arg ? \@init : \@non_init }, $attr; |
243 | } |
c32c2c61 |
244 | |
db72153d |
245 | my %new_params = ( ( map { $_->init_arg => $_->get_value($self) } @init ), %params ); |
c32c2c61 |
246 | |
db72153d |
247 | my $name = delete $new_params{name}; |
c32c2c61 |
248 | |
db72153d |
249 | my $clone = $class->new($name, %new_params, __hack_no_process_options => 1 ); |
c32c2c61 |
250 | |
db72153d |
251 | foreach my $attr ( @non_init ) { |
252 | $attr->set_value($clone, $attr->get_value($self)); |
c32c2c61 |
253 | } |
db72153d |
254 | |
255 | return $clone; |
c32c2c61 |
256 | } |
257 | |
1d768fb1 |
258 | sub _process_options { |
259 | my ($class, $name, $options) = @_; |
8de73ff1 |
260 | |
f3c4e20e |
261 | if (exists $options->{is}) { |
21f1e231 |
262 | |
012fcbd1 |
263 | ### ------------------------- |
264 | ## is => ro, writer => _foo # turns into (reader => foo, writer => _foo) as before |
265 | ## is => rw, writer => _foo # turns into (reader => foo, writer => _foo) |
266 | ## is => rw, accessor => _foo # turns into (accessor => _foo) |
267 | ## is => ro, accessor => _foo # error, accesor is rw |
268 | ### ------------------------- |
d03bd989 |
269 | |
8de73ff1 |
270 | if ($options->{is} eq 'ro') { |
be05faea |
271 | $class->throw_error("Cannot define an accessor name on a read-only attribute, accessors are read/write", data => $options) |
21f1e231 |
272 | if exists $options->{accessor}; |
8de73ff1 |
273 | $options->{reader} ||= $name; |
8de73ff1 |
274 | } |
275 | elsif ($options->{is} eq 'rw') { |
21f1e231 |
276 | if ($options->{writer}) { |
277 | $options->{reader} ||= $name; |
278 | } |
279 | else { |
280 | $options->{accessor} ||= $name; |
281 | } |
8de73ff1 |
282 | } |
ccd4cff9 |
283 | elsif ($options->{is} eq 'bare') { |
284 | # do nothing, but don't complain (later) about missing methods |
285 | } |
8de73ff1 |
286 | else { |
e606ae5f |
287 | $class->throw_error("I do not understand this option (is => " . $options->{is} . ") on attribute ($name)", data => $options->{is}); |
8de73ff1 |
288 | } |
f3c4e20e |
289 | } |
8de73ff1 |
290 | |
f3c4e20e |
291 | if (exists $options->{isa}) { |
f3c4e20e |
292 | if (exists $options->{does}) { |
1454efcc |
293 | if (try { $options->{isa}->can('does') }) { |
f3c4e20e |
294 | ($options->{isa}->does($options->{does})) |
e606ae5f |
295 | || $class->throw_error("Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)", data => $options); |
f3c4e20e |
296 | } |
297 | else { |
e606ae5f |
298 | $class->throw_error("Cannot have an isa option which cannot ->does() on attribute ($name)", data => $options); |
26fbace8 |
299 | } |
26fbace8 |
300 | } |
8de73ff1 |
301 | |
f3c4e20e |
302 | # allow for anon-subtypes here ... |
303 | if (blessed($options->{isa}) && $options->{isa}->isa('Moose::Meta::TypeConstraint')) { |
8de73ff1 |
304 | $options->{type_constraint} = $options->{isa}; |
305 | } |
306 | else { |
620db045 |
307 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa}); |
8de73ff1 |
308 | } |
f3c4e20e |
309 | } |
310 | elsif (exists $options->{does}) { |
311 | # allow for anon-subtypes here ... |
312 | if (blessed($options->{does}) && $options->{does}->isa('Moose::Meta::TypeConstraint')) { |
238b424d |
313 | $options->{type_constraint} = $options->{does}; |
8de73ff1 |
314 | } |
315 | else { |
620db045 |
316 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does}); |
8de73ff1 |
317 | } |
f3c4e20e |
318 | } |
8de73ff1 |
319 | |
f3c4e20e |
320 | if (exists $options->{coerce} && $options->{coerce}) { |
321 | (exists $options->{type_constraint}) |
e606ae5f |
322 | || $class->throw_error("You cannot have coercion without specifying a type constraint on attribute ($name)", data => $options); |
323 | $class->throw_error("You cannot have a weak reference to a coerced value on attribute ($name)", data => $options) |
8de73ff1 |
324 | if $options->{weak_ref}; |
f3c4e20e |
325 | } |
8de73ff1 |
326 | |
0b7df53c |
327 | if (exists $options->{trigger}) { |
21f1e231 |
328 | ('CODE' eq ref $options->{trigger}) |
e606ae5f |
329 | || $class->throw_error("Trigger must be a CODE ref on attribute ($name)", data => $options->{trigger}); |
0b7df53c |
330 | } |
331 | |
f3c4e20e |
332 | if (exists $options->{auto_deref} && $options->{auto_deref}) { |
333 | (exists $options->{type_constraint}) |
e606ae5f |
334 | || $class->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)", data => $options); |
f3c4e20e |
335 | ($options->{type_constraint}->is_a_type_of('ArrayRef') || |
8de73ff1 |
336 | $options->{type_constraint}->is_a_type_of('HashRef')) |
e606ae5f |
337 | || $class->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)", data => $options); |
f3c4e20e |
338 | } |
8de73ff1 |
339 | |
f3c4e20e |
340 | if (exists $options->{lazy_build} && $options->{lazy_build} == 1) { |
e606ae5f |
341 | $class->throw_error("You can not use lazy_build and default for the same attribute ($name)", data => $options) |
8de73ff1 |
342 | if exists $options->{default}; |
a6c84c69 |
343 | $options->{lazy} = 1; |
a6c84c69 |
344 | $options->{builder} ||= "_build_${name}"; |
345 | if ($name =~ /^_/) { |
f3c4e20e |
346 | $options->{clearer} ||= "_clear${name}"; |
347 | $options->{predicate} ||= "_has${name}"; |
d03bd989 |
348 | } |
a6c84c69 |
349 | else { |
f3c4e20e |
350 | $options->{clearer} ||= "clear_${name}"; |
351 | $options->{predicate} ||= "has_${name}"; |
26fbace8 |
352 | } |
f3c4e20e |
353 | } |
8de73ff1 |
354 | |
f3c4e20e |
355 | if (exists $options->{lazy} && $options->{lazy}) { |
9edba990 |
356 | (exists $options->{default} || defined $options->{builder} ) |
be05faea |
357 | || $class->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it", data => $options); |
f3c4e20e |
358 | } |
26fbace8 |
359 | |
9edba990 |
360 | if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) { |
be05faea |
361 | $class->throw_error("You cannot have a required attribute ($name) without a default, builder, or an init_arg", data => $options); |
9edba990 |
362 | } |
363 | |
78cd1d3b |
364 | } |
c0e30cf5 |
365 | |
d500266f |
366 | sub initialize_instance_slot { |
ddd0ec20 |
367 | my ($self, $meta_instance, $instance, $params) = @_; |
d500266f |
368 | my $init_arg = $self->init_arg(); |
369 | # try to fetch the init arg from the %params ... |
ddd0ec20 |
370 | |
26fbace8 |
371 | my $val; |
1ed0b94f |
372 | my $value_is_set; |
625d571f |
373 | if ( defined($init_arg) and exists $params->{$init_arg}) { |
d500266f |
374 | $val = $params->{$init_arg}; |
d03bd989 |
375 | $value_is_set = 1; |
d500266f |
376 | } |
377 | else { |
378 | # skip it if it's lazy |
379 | return if $self->is_lazy; |
380 | # and die if it's required and doesn't have a default value |
be05faea |
381 | $self->throw_error("Attribute (" . $self->name . ") is required", object => $instance, data => $params) |
26fbace8 |
382 | if $self->is_required && !$self->has_default && !$self->has_builder; |
ddd0ec20 |
383 | |
1ed0b94f |
384 | # if nothing was in the %params, we can use the |
385 | # attribute's default value (if it has one) |
386 | if ($self->has_default) { |
387 | $val = $self->default($instance); |
388 | $value_is_set = 1; |
d03bd989 |
389 | } |
a6c84c69 |
390 | elsif ($self->has_builder) { |
e606ae5f |
391 | $val = $self->_call_builder($instance); |
392 | $value_is_set = 1; |
a0748c37 |
393 | } |
26fbace8 |
394 | } |
395 | |
1ed0b94f |
396 | return unless $value_is_set; |
397 | |
9c9563c7 |
398 | $val = $self->_coerce_and_verify( $val, $instance ); |
ddd0ec20 |
399 | |
759e4e8f |
400 | $self->set_initial_value($instance, $val); |
312e0f0c |
401 | |
402 | if ( ref $val && $self->is_weak_ref ) { |
32881f68 |
403 | $self->_weaken_value($instance); |
312e0f0c |
404 | } |
d500266f |
405 | } |
406 | |
e606ae5f |
407 | sub _call_builder { |
408 | my ( $self, $instance ) = @_; |
409 | |
410 | my $builder = $self->builder(); |
411 | |
412 | return $instance->$builder() |
413 | if $instance->can( $self->builder ); |
414 | |
415 | $self->throw_error( blessed($instance) |
416 | . " does not support builder method '" |
417 | . $self->builder |
418 | . "' for attribute '" |
419 | . $self->name |
420 | . "'", |
421 | object => $instance, |
422 | ); |
423 | } |
424 | |
d617b644 |
425 | ## Slot management |
9e93dd19 |
426 | |
8abe9636 |
427 | # FIXME: |
d03bd989 |
428 | # this duplicates too much code from |
429 | # Class::MOP::Attribute, we need to |
8abe9636 |
430 | # refactor these bits eventually. |
431 | # - SL |
432 | sub _set_initial_slot_value { |
433 | my ($self, $meta_instance, $instance, $value) = @_; |
434 | |
435 | my $slot_name = $self->name; |
436 | |
437 | return $meta_instance->set_slot_value($instance, $slot_name, $value) |
438 | unless $self->has_initializer; |
439 | |
440 | my ($type_constraint, $can_coerce); |
441 | if ($self->has_type_constraint) { |
442 | $type_constraint = $self->type_constraint; |
443 | $can_coerce = ($self->should_coerce && $type_constraint->has_coercion); |
444 | } |
445 | |
446 | my $callback = sub { |
9c9563c7 |
447 | my $val = $self->_coerce_and_verify( shift, $instance );; |
448 | |
8abe9636 |
449 | $meta_instance->set_slot_value($instance, $slot_name, $val); |
450 | }; |
d03bd989 |
451 | |
8abe9636 |
452 | my $initializer = $self->initializer; |
453 | |
454 | # most things will just want to set a value, so make it first arg |
455 | $instance->$initializer($value, $callback, $self); |
456 | } |
457 | |
946289d1 |
458 | sub set_value { |
b6af66f8 |
459 | my ($self, $instance, @args) = @_; |
460 | my $value = $args[0]; |
26fbace8 |
461 | |
946289d1 |
462 | my $attr_name = $self->name; |
26fbace8 |
463 | |
b6af66f8 |
464 | if ($self->is_required and not @args) { |
be05faea |
465 | $self->throw_error("Attribute ($attr_name) is required", object => $instance); |
946289d1 |
466 | } |
26fbace8 |
467 | |
9c9563c7 |
468 | $value = $self->_coerce_and_verify( $value, $instance ); |
26fbace8 |
469 | |
3dda07f5 |
470 | my @old; |
471 | if ( $self->has_trigger && $self->has_value($instance) ) { |
472 | @old = $self->get_value($instance, 'for trigger'); |
473 | } |
474 | |
312e0f0c |
475 | $self->SUPER::set_value($instance, $value); |
26fbace8 |
476 | |
312e0f0c |
477 | if ( ref $value && $self->is_weak_ref ) { |
32881f68 |
478 | $self->_weaken_value($instance); |
946289d1 |
479 | } |
26fbace8 |
480 | |
946289d1 |
481 | if ($self->has_trigger) { |
3dda07f5 |
482 | $self->trigger->($instance, $value, @old); |
946289d1 |
483 | } |
484 | } |
485 | |
32881f68 |
486 | sub _weaken_value { |
312e0f0c |
487 | my ( $self, $instance ) = @_; |
488 | |
32881f68 |
489 | my $meta_instance = Class::MOP::Class->initialize( blessed($instance) ) |
490 | ->get_meta_instance; |
312e0f0c |
491 | |
492 | $meta_instance->weaken_slot_value( $instance, $self->name ); |
493 | } |
494 | |
946289d1 |
495 | sub get_value { |
3dda07f5 |
496 | my ($self, $instance, $for_trigger) = @_; |
26fbace8 |
497 | |
946289d1 |
498 | if ($self->is_lazy) { |
8de73ff1 |
499 | unless ($self->has_value($instance)) { |
e606ae5f |
500 | my $value; |
8de73ff1 |
501 | if ($self->has_default) { |
e606ae5f |
502 | $value = $self->default($instance); |
3f11800d |
503 | } elsif ( $self->has_builder ) { |
e606ae5f |
504 | $value = $self->_call_builder($instance); |
505 | } |
9c9563c7 |
506 | |
507 | $value = $self->_coerce_and_verify( $value, $instance ); |
508 | |
e606ae5f |
509 | $self->set_initial_value($instance, $value); |
8de73ff1 |
510 | } |
946289d1 |
511 | } |
26fbace8 |
512 | |
3dda07f5 |
513 | if ( $self->should_auto_deref && ! $for_trigger ) { |
26fbace8 |
514 | |
946289d1 |
515 | my $type_constraint = $self->type_constraint; |
516 | |
517 | if ($type_constraint->is_a_type_of('ArrayRef')) { |
518 | my $rv = $self->SUPER::get_value($instance); |
519 | return unless defined $rv; |
520 | return wantarray ? @{ $rv } : $rv; |
26fbace8 |
521 | } |
946289d1 |
522 | elsif ($type_constraint->is_a_type_of('HashRef')) { |
523 | my $rv = $self->SUPER::get_value($instance); |
524 | return unless defined $rv; |
525 | return wantarray ? %{ $rv } : $rv; |
26fbace8 |
526 | } |
946289d1 |
527 | else { |
46cb090f |
528 | $self->throw_error("Can not auto de-reference the type constraint '" . $type_constraint->name . "'", object => $instance, type_constraint => $type_constraint); |
946289d1 |
529 | } |
26fbace8 |
530 | |
946289d1 |
531 | } |
532 | else { |
26fbace8 |
533 | |
946289d1 |
534 | return $self->SUPER::get_value($instance); |
26fbace8 |
535 | } |
946289d1 |
536 | } |
a15dff8d |
537 | |
26fbace8 |
538 | ## installing accessors |
c0e30cf5 |
539 | |
246bbeef |
540 | sub accessor_metaclass { 'Moose::Meta::Method::Accessor' } |
541 | |
542 | sub install_accessors { |
ae907ae0 |
543 | my $self = shift; |
246bbeef |
544 | $self->SUPER::install_accessors(@_); |
545 | $self->install_delegation if $self->has_handles; |
28af3424 |
546 | return; |
547 | } |
548 | |
9340e346 |
549 | sub _check_associated_methods { |
28af3424 |
550 | my $self = shift; |
86cf196b |
551 | unless ( |
0bbd378f |
552 | @{ $self->associated_methods } |
86cf196b |
553 | || ($self->_is_metadata || '') eq 'bare' |
554 | ) { |
555 | Carp::cluck( |
8f4450f3 |
556 | 'Attribute (' . $self->name . ') of class ' |
557 | . $self->associated_class->name |
558 | . ' has no associated methods' |
86cf196b |
559 | . ' (did you mean to provide an "is" argument?)' |
560 | . "\n" |
561 | ) |
562 | } |
e606ae5f |
563 | } |
26fbace8 |
564 | |
3b6e2290 |
565 | sub _process_accessors { |
566 | my $self = shift; |
567 | my ($type, $accessor, $generate_as_inline_methods) = @_; |
568 | $accessor = (keys %$accessor)[0] if (ref($accessor)||'') eq 'HASH'; |
99541dfd |
569 | my $method = $self->associated_class->get_method($accessor); |
570 | if ($method && !$method->isa('Class::MOP::Method::Accessor') |
571 | && (!$self->definition_context |
572 | || $method->package_name eq $self->definition_context->{package})) { |
3b6e2290 |
573 | Carp::cluck( |
1d18c898 |
574 | "You are overwriting a locally defined method ($accessor) with " |
3b6e2290 |
575 | . "an accessor" |
576 | ); |
577 | } |
578 | $self->SUPER::_process_accessors(@_); |
e606ae5f |
579 | } |
26fbace8 |
580 | |
e1d6f0a3 |
581 | sub remove_accessors { |
582 | my $self = shift; |
583 | $self->SUPER::remove_accessors(@_); |
584 | $self->remove_delegation if $self->has_handles; |
585 | return; |
586 | } |
587 | |
e606ae5f |
588 | sub install_delegation { |
589 | my $self = shift; |
26fbace8 |
590 | |
e606ae5f |
591 | # NOTE: |
592 | # Here we canonicalize the 'handles' option |
593 | # this will sort out any details and always |
594 | # return an hash of methods which we want |
595 | # to delagate to, see that method for details |
596 | my %handles = $self->_canonicalize_handles; |
597 | |
e606ae5f |
598 | |
599 | # install the delegation ... |
600 | my $associated_class = $self->associated_class; |
601 | foreach my $handle (keys %handles) { |
602 | my $method_to_call = $handles{$handle}; |
603 | my $class_name = $associated_class->name; |
604 | my $name = "${class_name}::${handle}"; |
26fbace8 |
605 | |
452bac1b |
606 | (!$associated_class->has_method($handle)) |
cee532a1 |
607 | || $self->throw_error("You cannot overwrite a locally defined method ($handle) with a delegation", method_name => $handle); |
26fbace8 |
608 | |
e606ae5f |
609 | # NOTE: |
610 | # handles is not allowed to delegate |
611 | # any of these methods, as they will |
612 | # override the ones in your class, which |
613 | # is almost certainly not what you want. |
4fe78472 |
614 | |
e606ae5f |
615 | # FIXME warn when $handle was explicitly specified, but not if the source is a regex or something |
616 | #cluck("Not delegating method '$handle' because it is a core method") and |
617 | next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle); |
26fbace8 |
618 | |
46f7e6a5 |
619 | my $method = $self->_make_delegation_method($handle, $method_to_call); |
a05f85c1 |
620 | |
621 | $self->associated_class->add_method($method->name, $method); |
0bbd378f |
622 | $self->associate_method($method); |
d03bd989 |
623 | } |
452bac1b |
624 | } |
625 | |
e1d6f0a3 |
626 | sub remove_delegation { |
627 | my $self = shift; |
628 | my %handles = $self->_canonicalize_handles; |
629 | my $associated_class = $self->associated_class; |
630 | foreach my $handle (keys %handles) { |
684323b3 |
631 | next unless any { $handle eq $_ } |
632 | map { $_->name } |
633 | @{ $self->associated_methods }; |
e1d6f0a3 |
634 | $self->associated_class->remove_method($handle); |
635 | } |
636 | } |
637 | |
98aae381 |
638 | # private methods to help delegation ... |
639 | |
452bac1b |
640 | sub _canonicalize_handles { |
641 | my $self = shift; |
642 | my $handles = $self->handles; |
c84f324f |
643 | if (my $handle_type = ref($handles)) { |
644 | if ($handle_type eq 'HASH') { |
645 | return %{$handles}; |
646 | } |
647 | elsif ($handle_type eq 'ARRAY') { |
648 | return map { $_ => $_ } @{$handles}; |
649 | } |
650 | elsif ($handle_type eq 'Regexp') { |
651 | ($self->has_type_constraint) |
0286711b |
652 | || $self->throw_error("Cannot delegate methods based on a Regexp without a type constraint (isa)", data => $handles); |
26fbace8 |
653 | return map { ($_ => $_) } |
c84f324f |
654 | grep { /$handles/ } $self->_get_delegate_method_list; |
655 | } |
656 | elsif ($handle_type eq 'CODE') { |
657 | return $handles->($self, $self->_find_delegate_metaclass); |
658 | } |
6cbf4a23 |
659 | elsif (blessed($handles) && $handles->isa('Moose::Meta::TypeConstraint::DuckType')) { |
660 | return map { $_ => $_ } @{ $handles->methods }; |
661 | } |
c84f324f |
662 | else { |
be05faea |
663 | $self->throw_error("Unable to canonicalize the 'handles' option with $handles", data => $handles); |
c84f324f |
664 | } |
452bac1b |
665 | } |
666 | else { |
c8d9f1e2 |
667 | Class::MOP::load_class($handles); |
668 | my $role_meta = Class::MOP::class_of($handles); |
c84f324f |
669 | |
670 | (blessed $role_meta && $role_meta->isa('Moose::Meta::Role')) |
425ca605 |
671 | || $self->throw_error("Unable to canonicalize the 'handles' option with $handles because its metaclass is not a Moose::Meta::Role", data => $handles); |
d03bd989 |
672 | |
a8547bc0 |
673 | return map { $_ => $_ } |
674 | grep { $_ ne 'meta' } ( |
26fbace8 |
675 | $role_meta->get_method_list, |
b07a4e6d |
676 | map { $_->name } $role_meta->get_required_method_list, |
a8547bc0 |
677 | ); |
452bac1b |
678 | } |
679 | } |
680 | |
681 | sub _find_delegate_metaclass { |
682 | my $self = shift; |
98aae381 |
683 | if (my $class = $self->_isa_metadata) { |
9031e2c4 |
684 | # we might be dealing with a non-Moose class, |
685 | # and need to make our own metaclass. if there's |
686 | # already a metaclass, it will be returned |
452bac1b |
687 | return Moose::Meta::Class->initialize($class); |
688 | } |
98aae381 |
689 | elsif (my $role = $self->_does_metadata) { |
91e6653b |
690 | return Class::MOP::class_of($role); |
452bac1b |
691 | } |
692 | else { |
be05faea |
693 | $self->throw_error("Cannot find delegate metaclass for attribute " . $self->name); |
452bac1b |
694 | } |
695 | } |
696 | |
697 | sub _get_delegate_method_list { |
698 | my $self = shift; |
699 | my $meta = $self->_find_delegate_metaclass; |
700 | if ($meta->isa('Class::MOP::Class')) { |
e606ae5f |
701 | return map { $_->name } # NOTE: !never! delegate &meta |
702 | grep { $_->package_name ne 'Moose::Object' && $_->name ne 'meta' } |
703 | $meta->get_all_methods; |
452bac1b |
704 | } |
705 | elsif ($meta->isa('Moose::Meta::Role')) { |
26fbace8 |
706 | return $meta->get_method_list; |
452bac1b |
707 | } |
708 | else { |
be05faea |
709 | $self->throw_error("Unable to recognize the delegate metaclass '$meta'", data => $meta); |
452bac1b |
710 | } |
711 | } |
712 | |
bd1226e2 |
713 | sub delegation_metaclass { 'Moose::Meta::Method::Delegation' } |
714 | |
a05f85c1 |
715 | sub _make_delegation_method { |
46f7e6a5 |
716 | my ( $self, $handle_name, $method_to_call ) = @_; |
a05f85c1 |
717 | |
3c573ca4 |
718 | my @curried_arguments; |
2de18801 |
719 | |
3c573ca4 |
720 | ($method_to_call, @curried_arguments) = @$method_to_call |
2de18801 |
721 | if 'ARRAY' eq ref($method_to_call); |
722 | |
bd1226e2 |
723 | return $self->delegation_metaclass->new( |
46f7e6a5 |
724 | name => $handle_name, |
725 | package_name => $self->associated_class->name, |
726 | attribute => $self, |
727 | delegate_to_method => $method_to_call, |
3c573ca4 |
728 | curried_arguments => \@curried_arguments, |
a05f85c1 |
729 | ); |
730 | } |
731 | |
9c9563c7 |
732 | sub _coerce_and_verify { |
733 | my $self = shift; |
734 | my $val = shift; |
735 | my $instance = shift; |
736 | |
737 | return $val unless $self->has_type_constraint; |
738 | |
739 | my $type_constraint = $self->type_constraint; |
740 | if ($self->should_coerce && $type_constraint->has_coercion) { |
741 | $val = $type_constraint->coerce($val); |
742 | } |
743 | |
744 | $self->verify_against_type_constraint($val, instance => $instance); |
745 | |
746 | return $val; |
747 | } |
748 | |
5755a9b2 |
749 | sub verify_against_type_constraint { |
2b86e02b |
750 | my $self = shift; |
751 | my $val = shift; |
752 | |
753 | return 1 if !$self->has_type_constraint; |
754 | |
755 | my $type_constraint = $self->type_constraint; |
756 | |
757 | $type_constraint->check($val) |
758 | || $self->throw_error("Attribute (" |
759 | . $self->name |
760 | . ") does not pass the type constraint because: " |
761 | . $type_constraint->get_message($val), data => $val, @_); |
762 | } |
763 | |
21f1e231 |
764 | package Moose::Meta::Attribute::Custom::Moose; |
765 | sub register_implementation { 'Moose::Meta::Attribute' } |
766 | |
c0e30cf5 |
767 | 1; |
768 | |
769 | __END__ |
770 | |
771 | =pod |
772 | |
773 | =head1 NAME |
774 | |
6ba6d68c |
775 | Moose::Meta::Attribute - The Moose attribute metaclass |
c0e30cf5 |
776 | |
777 | =head1 DESCRIPTION |
778 | |
93a708fd |
779 | This class is a subclass of L<Class::MOP::Attribute> that provides |
780 | additional Moose-specific functionality. |
6ba6d68c |
781 | |
7854b409 |
782 | To really understand this class, you will need to start with the |
783 | L<Class::MOP::Attribute> documentation. This class can be understood |
784 | as a set of additional features on top of the basic feature provided |
785 | by that parent class. |
e522431d |
786 | |
d4b1449e |
787 | =head1 INHERITANCE |
788 | |
789 | C<Moose::Meta::Attribute> is a subclass of L<Class::MOP::Attribute>. |
790 | |
c0e30cf5 |
791 | =head1 METHODS |
792 | |
93a708fd |
793 | Many of the documented below override methods in |
794 | L<Class::MOP::Attribute> and add Moose specific features. |
6ba6d68c |
795 | |
93a708fd |
796 | =head2 Creation |
6ba6d68c |
797 | |
c0e30cf5 |
798 | =over 4 |
799 | |
93a708fd |
800 | =item B<< Moose::Meta::Attribute->new(%options) >> |
c0e30cf5 |
801 | |
93a708fd |
802 | This method overrides the L<Class::MOP::Attribute> constructor. |
c32c2c61 |
803 | |
93a708fd |
804 | Many of the options below are described in more detail in the |
805 | L<Moose::Manual::Attributes> document. |
6e2840b7 |
806 | |
93a708fd |
807 | It adds the following options to the constructor: |
d500266f |
808 | |
93a708fd |
809 | =over 8 |
452bac1b |
810 | |
996b8c8d |
811 | =item * is => 'ro', 'rw', 'bare' |
e1d6f0a3 |
812 | |
93a708fd |
813 | This provides a shorthand for specifying the C<reader>, C<writer>, or |
814 | C<accessor> names. If the attribute is read-only ('ro') then it will |
815 | have a C<reader> method with the same attribute as the name. |
e606ae5f |
816 | |
93a708fd |
817 | If it is read-write ('rw') then it will have an C<accessor> method |
818 | with the same name. If you provide an explicit C<writer> for a |
819 | read-write attribute, then you will have a C<reader> with the same |
820 | name as the attribute, and a C<writer> with the name you provided. |
e1d6f0a3 |
821 | |
996b8c8d |
822 | Use 'bare' when you are deliberately not installing any methods |
823 | (accessor, reader, etc.) associated with this attribute; otherwise, |
824 | Moose will issue a deprecation warning when this attribute is added to a |
9340e346 |
825 | metaclass. |
996b8c8d |
826 | |
93a708fd |
827 | =item * isa => $type |
39b3bc94 |
828 | |
93a708fd |
829 | This option accepts a type. The type can be a string, which should be |
830 | a type name. If the type name is unknown, it is assumed to be a class |
831 | name. |
832 | |
833 | This option can also accept a L<Moose::Meta::TypeConstraint> object. |
834 | |
835 | If you I<also> provide a C<does> option, then your C<isa> option must |
836 | be a class name, and that class must do the role specified with |
837 | C<does>. |
838 | |
839 | =item * does => $role |
840 | |
841 | This is short-hand for saying that the attribute's type must be an |
842 | object which does the named role. |
843 | |
844 | =item * coerce => $bool |
845 | |
846 | This option is only valid for objects with a type constraint |
847 | (C<isa>). If this is true, then coercions will be applied whenever |
848 | this attribute is set. |
849 | |
850 | You can make both this and the C<weak_ref> option true. |
851 | |
852 | =item * trigger => $sub |
853 | |
854 | This option accepts a subroutine reference, which will be called after |
855 | the attribute is set. |
856 | |
857 | =item * required => $bool |
858 | |
859 | An attribute which is required must be provided to the constructor. An |
860 | attribute which is required can also have a C<default> or C<builder>, |
36741534 |
861 | which will satisfy its required-ness. |
93a708fd |
862 | |
863 | A required attribute must have a C<default>, C<builder> or a |
864 | non-C<undef> C<init_arg> |
865 | |
866 | =item * lazy => $bool |
867 | |
868 | A lazy attribute must have a C<default> or C<builder>. When an |
869 | attribute is lazy, the default value will not be calculated until the |
870 | attribute is read. |
871 | |
872 | =item * weak_ref => $bool |
873 | |
874 | If this is true, the attribute's value will be stored as a weak |
875 | reference. |
876 | |
877 | =item * auto_deref => $bool |
878 | |
879 | If this is true, then the reader will dereference the value when it is |
880 | called. The attribute must have a type constraint which defines the |
881 | attribute as an array or hash reference. |
882 | |
883 | =item * lazy_build => $bool |
884 | |
885 | Setting this to true makes the attribute lazy and provides a number of |
886 | default methods. |
887 | |
888 | has 'size' => ( |
889 | is => 'ro', |
890 | lazy_build => 1, |
891 | ); |
892 | |
893 | is equivalent to this: |
894 | |
895 | has 'size' => ( |
896 | is => 'ro', |
897 | lazy => 1, |
898 | builder => '_build_size', |
899 | clearer => 'clear_size', |
900 | predicate => 'has_size', |
901 | ); |
902 | |
903 | =item * documentation |
904 | |
905 | An arbitrary string that can be retrieved later by calling C<< |
906 | $attr->documentation >>. |
907 | |
908 | =back |
909 | |
910 | =item B<< $attr->clone(%options) >> |
911 | |
912 | This creates a new attribute based on attribute being cloned. You must |
913 | supply a C<name> option to provide a new name for the attribute. |
914 | |
915 | The C<%options> can only specify options handled by |
916 | L<Class::MOP::Attribute>. |
917 | |
36741534 |
918 | =back |
919 | |
93a708fd |
920 | =head2 Value management |
921 | |
36741534 |
922 | =over 4 |
923 | |
93a708fd |
924 | =item B<< $attr->initialize_instance_slot($meta_instance, $instance, $params) >> |
925 | |
926 | This method is used internally to initialize the attribute's slot in |
927 | the object C<$instance>. |
928 | |
929 | This overrides the L<Class::MOP::Attribute> method to handle lazy |
930 | attributes, weak references, and type constraints. |
bd1226e2 |
931 | |
946289d1 |
932 | =item B<get_value> |
933 | |
934 | =item B<set_value> |
935 | |
6549b0d1 |
936 | eval { $point->meta->get_attribute('x')->set_value($point, 'forty-two') }; |
bcbaa845 |
937 | if($@) { |
938 | print "Oops: $@\n"; |
939 | } |
940 | |
6549b0d1 |
941 | I<Attribute (x) does not pass the type constraint (Int) with 'forty-two'> |
bcbaa845 |
942 | |
943 | Before setting the value, a check is made on the type constraint of |
944 | the attribute, if it has one, to see if the value passes it. If the |
46cb090f |
945 | value fails to pass, the set operation dies with a L<throw_error>. |
bcbaa845 |
946 | |
947 | Any coercion to convert values is done before checking the type constraint. |
948 | |
949 | To check a value against a type constraint before setting it, fetch the |
ec00fa75 |
950 | attribute instance using L<Class::MOP::Class/find_attribute_by_name>, |
bcbaa845 |
951 | fetch the type_constraint from the attribute using L<Moose::Meta::Attribute/type_constraint> |
e606ae5f |
952 | and call L<Moose::Meta::TypeConstraint/check>. See L<Moose::Cookbook::Basics::Recipe4> |
bcbaa845 |
953 | for an example. |
954 | |
a15dff8d |
955 | =back |
956 | |
93a708fd |
957 | =head2 Attribute Accessor generation |
6ba6d68c |
958 | |
a15dff8d |
959 | =over 4 |
960 | |
93a708fd |
961 | =item B<< $attr->install_accessors >> |
be05faea |
962 | |
93a708fd |
963 | This method overrides the parent to also install delegation methods. |
be05faea |
964 | |
7a582117 |
965 | If, after installing all methods, the attribute object has no associated |
966 | methods, it throws an error unless C<< is => 'bare' >> was passed to the |
967 | attribute constructor. (Trying to add an attribute that has no associated |
968 | methods is almost always an error.) |
969 | |
36741534 |
970 | =item B<< $attr->remove_accessors >> |
d5c30e52 |
971 | |
93a708fd |
972 | This method overrides the parent to also remove delegation methods. |
d5c30e52 |
973 | |
93a708fd |
974 | =item B<< $attr->install_delegation >> |
975 | |
976 | This method adds its delegation methods to the attribute's associated |
977 | class, if it has any to add. |
978 | |
979 | =item B<< $attr->remove_delegation >> |
980 | |
981 | This method remove its delegation methods from the attribute's |
982 | associated class. |
d5c30e52 |
983 | |
93a708fd |
984 | =item B<< $attr->accessor_metaclass >> |
9e93dd19 |
985 | |
93a708fd |
986 | Returns the accessor metaclass name, which defaults to |
987 | L<Moose::Meta::Method::Accessor>. |
988 | |
989 | =item B<< $attr->delegation_metaclass >> |
990 | |
991 | Returns the delegation metaclass name, which defaults to |
992 | L<Moose::Meta::Method::Delegation>. |
993 | |
994 | =back |
995 | |
996 | =head2 Additional Moose features |
997 | |
998 | These methods are not found in the superclass. They support features |
999 | provided by Moose. |
1000 | |
36741534 |
1001 | =over 4 |
1002 | |
93a708fd |
1003 | =item B<< $attr->does($role) >> |
1004 | |
1005 | This indicates whether the I<attribute itself> does the given |
36741534 |
1006 | role. The role can be given as a full class name, or as a resolvable |
93a708fd |
1007 | trait name. |
1008 | |
1009 | Note that this checks the attribute itself, not its type constraint, |
1010 | so it is checking the attribute's metaclass and any traits applied to |
1011 | the attribute. |
1012 | |
1013 | =item B<< Moose::Meta::Class->interpolate_class_and_new($name, %options) >> |
1014 | |
1015 | This is an alternate constructor that handles the C<metaclass> and |
1016 | C<traits> options. |
9e93dd19 |
1017 | |
93a708fd |
1018 | Effectively, this method is a factory that finds or creates the |
36741534 |
1019 | appropriate class for the given C<metaclass> and/or C<traits>. |
e606ae5f |
1020 | |
93a708fd |
1021 | Once it has the appropriate class, it will call C<< $class->new($name, |
1022 | %options) >> on that class. |
e606ae5f |
1023 | |
93a708fd |
1024 | =item B<< $attr->clone_and_inherit_options(%options) >> |
a15dff8d |
1025 | |
93a708fd |
1026 | This method supports the C<has '+foo'> feature. It does various bits |
1027 | of processing on the supplied C<%options> before ultimately calling |
1028 | the C<clone> method. |
6ba6d68c |
1029 | |
93a708fd |
1030 | One of its main tasks is to make sure that the C<%options> provided |
1031 | only includes the options returned by the |
1032 | C<legal_options_for_inheritance> method. |
a15dff8d |
1033 | |
93a708fd |
1034 | =item B<< $attr->legal_options_for_inheritance >> |
a15dff8d |
1035 | |
93a708fd |
1036 | This returns a whitelist of options that can be overridden in a |
1037 | subclass's attribute definition. |
2b86e02b |
1038 | |
93a708fd |
1039 | This exists to allow a custom metaclass to change or add to the list |
1040 | of options which can be changed. |
2b86e02b |
1041 | |
93a708fd |
1042 | =item B<< $attr->type_constraint >> |
452bac1b |
1043 | |
93a708fd |
1044 | Returns the L<Moose::Meta::TypeConstraint> object for this attribute, |
1045 | if it has one. |
452bac1b |
1046 | |
93a708fd |
1047 | =item B<< $attr->has_type_constraint >> |
452bac1b |
1048 | |
93a708fd |
1049 | Returns true if this attribute has a type constraint. |
452bac1b |
1050 | |
93a708fd |
1051 | =item B<< $attr->verify_against_type_constraint($value) >> |
a15dff8d |
1052 | |
93a708fd |
1053 | Given a value, this method returns true if the value is valid for the |
1054 | attribute's type constraint. If the value is not valid, it throws an |
1055 | error. |
4b598ea3 |
1056 | |
93a708fd |
1057 | =item B<< $attr->handles >> |
ca01a97b |
1058 | |
93a708fd |
1059 | This returns the value of the C<handles> option passed to the |
1060 | constructor. |
ca01a97b |
1061 | |
93a708fd |
1062 | =item B<< $attr->has_handles >> |
ca01a97b |
1063 | |
93a708fd |
1064 | Returns true if this attribute performs delegation. |
ca01a97b |
1065 | |
93a708fd |
1066 | =item B<< $attr->is_weak_ref >> |
26fbace8 |
1067 | |
93a708fd |
1068 | Returns true if this attribute stores its value as a weak reference. |
26fbace8 |
1069 | |
93a708fd |
1070 | =item B<< $attr->is_required >> |
26fbace8 |
1071 | |
93a708fd |
1072 | Returns true if this attribute is required to have a value. |
26fbace8 |
1073 | |
93a708fd |
1074 | =item B<< $attr->is_lazy >> |
58f85113 |
1075 | |
93a708fd |
1076 | Returns true if this attribute is lazy. |
26fbace8 |
1077 | |
93a708fd |
1078 | =item B<< $attr->is_lazy_build >> |
ca01a97b |
1079 | |
93a708fd |
1080 | Returns true if the C<lazy_build> option was true when passed to the |
1081 | constructor. |
4b598ea3 |
1082 | |
93a708fd |
1083 | =item B<< $attr->should_coerce >> |
6ba6d68c |
1084 | |
93a708fd |
1085 | Returns true if the C<coerce> option passed to the constructor was |
1086 | true. |
536f0b17 |
1087 | |
93a708fd |
1088 | =item B<< $attr->should_auto_deref >> |
536f0b17 |
1089 | |
93a708fd |
1090 | Returns true if the C<auto_deref> option passed to the constructor was |
1091 | true. |
536f0b17 |
1092 | |
93a708fd |
1093 | =item B<< $attr->trigger >> |
8c9d74e7 |
1094 | |
93a708fd |
1095 | This is the subroutine reference that was in the C<trigger> option |
1096 | passed to the constructor, if any. |
02a0fb52 |
1097 | |
36741534 |
1098 | =item B<< $attr->has_trigger >> |
8c9d74e7 |
1099 | |
93a708fd |
1100 | Returns true if this attribute has a trigger set. |
02a0fb52 |
1101 | |
93a708fd |
1102 | =item B<< $attr->documentation >> |
ddbdc0cb |
1103 | |
93a708fd |
1104 | Returns the value that was in the C<documentation> option passed to |
1105 | the constructor, if any. |
ddbdc0cb |
1106 | |
93a708fd |
1107 | =item B<< $attr->has_documentation >> |
ddbdc0cb |
1108 | |
93a708fd |
1109 | Returns true if this attribute has any documentation. |
ddbdc0cb |
1110 | |
93a708fd |
1111 | =item B<< $attr->applied_traits >> |
88f23977 |
1112 | |
93a708fd |
1113 | This returns an array reference of all the traits which were applied |
1114 | to this attribute. If none were applied, this returns C<undef>. |
88f23977 |
1115 | |
93a708fd |
1116 | =item B<< $attr->has_applied_traits >> |
88f23977 |
1117 | |
93a708fd |
1118 | Returns true if this attribute has any traits applied. |
88f23977 |
1119 | |
c0e30cf5 |
1120 | =back |
1121 | |
1122 | =head1 BUGS |
1123 | |
d4048ef3 |
1124 | See L<Moose/BUGS> for details on reporting bugs. |
c0e30cf5 |
1125 | |
c0e30cf5 |
1126 | =head1 AUTHOR |
1127 | |
1128 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
1129 | |
98aae381 |
1130 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
1131 | |
c0e30cf5 |
1132 | =head1 COPYRIGHT AND LICENSE |
1133 | |
7e0492d3 |
1134 | Copyright 2006-2010 by Infinity Interactive, Inc. |
c0e30cf5 |
1135 | |
1136 | L<http://www.iinteractive.com> |
1137 | |
1138 | This library is free software; you can redistribute it and/or modify |
26fbace8 |
1139 | it under the same terms as Perl itself. |
c0e30cf5 |
1140 | |
8a7a9c53 |
1141 | =cut |