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 | |
b6cca0d5 |
12 | our $VERSION = '1.14'; |
d44714be |
13 | our $AUTHORITY = 'cpan:STEVAN'; |
78cd1d3b |
14 | |
f1309155 |
15 | use Moose::Deprecated; |
8ee73eeb |
16 | use Moose::Meta::Method::Accessor; |
a05f85c1 |
17 | use Moose::Meta::Method::Delegation; |
d5c30e52 |
18 | use Moose::Util (); |
a3c7e2fe |
19 | use Moose::Util::TypeConstraints (); |
bc1e29b5 |
20 | |
f785aad8 |
21 | use base 'Class::MOP::Attribute', 'Moose::Meta::Mixin::AttributeCore'; |
c0e30cf5 |
22 | |
82a5b1a7 |
23 | __PACKAGE__->meta->add_attribute('traits' => ( |
24 | reader => 'applied_traits', |
25 | predicate => 'has_applied_traits', |
26 | )); |
82168dbb |
27 | |
d03bd989 |
28 | # we need to have a ->does method in here to |
29 | # more easily support traits, and the introspection |
0db4f1d7 |
30 | # of those traits. We extend the does check to look |
31 | # for metatrait aliases. |
32 | sub does { |
33 | my ($self, $role_name) = @_; |
1454efcc |
34 | my $name = try { |
0db4f1d7 |
35 | Moose::Util::resolve_metatrait_alias(Attribute => $role_name) |
36 | }; |
37 | return 0 if !defined($name); # failed to load class |
e8895723 |
38 | return $self->Moose::Object::does($name); |
0db4f1d7 |
39 | } |
587e457d |
40 | |
be05faea |
41 | sub throw_error { |
42 | my $self = shift; |
43 | my $class = ( ref $self && $self->associated_class ) || "Moose::Meta::Class"; |
44 | unshift @_, "message" if @_ % 2 == 1; |
45 | unshift @_, attr => $self if ref $self; |
46 | unshift @_, $class; |
18748ad6 |
47 | my $handler = $class->can("throw_error"); # to avoid incrementing depth by 1 |
48 | goto $handler; |
be05faea |
49 | } |
50 | |
78cd1d3b |
51 | sub new { |
f3c4e20e |
52 | my ($class, $name, %options) = @_; |
c32c2c61 |
53 | $class->_process_options($name, \%options) unless $options{__hack_no_process_options}; # used from clone()... YECHKKK FIXME ICKY YUCK GROSS |
aa4c3a8d |
54 | |
55 | delete $options{__hack_no_process_options}; |
56 | |
57 | my %attrs = |
58 | ( map { $_ => 1 } |
59 | grep { defined } |
60 | map { $_->init_arg() } |
61 | $class->meta()->get_all_attributes() |
62 | ); |
63 | |
64 | my @bad = sort grep { ! $attrs{$_} } keys %options; |
65 | |
66 | if (@bad) |
67 | { |
68 | Carp::cluck "Found unknown argument(s) passed to '$name' attribute constructor in '$class': @bad"; |
69 | } |
70 | |
f3c4e20e |
71 | return $class->SUPER::new($name, %options); |
1d768fb1 |
72 | } |
73 | |
d5c30e52 |
74 | sub interpolate_class_and_new { |
aa4c3a8d |
75 | my ($class, $name, %args) = @_; |
d5c30e52 |
76 | |
aa4c3a8d |
77 | my ( $new_class, @traits ) = $class->interpolate_class(\%args); |
d03bd989 |
78 | |
aa4c3a8d |
79 | $new_class->new($name, %args, ( scalar(@traits) ? ( traits => \@traits ) : () ) ); |
d5c30e52 |
80 | } |
81 | |
82 | sub interpolate_class { |
aa4c3a8d |
83 | my ($class, $options) = @_; |
d5c30e52 |
84 | |
c32c2c61 |
85 | $class = ref($class) || $class; |
86 | |
aa4c3a8d |
87 | if ( my $metaclass_name = delete $options->{metaclass} ) { |
c32c2c61 |
88 | my $new_class = Moose::Util::resolve_metaclass_alias( Attribute => $metaclass_name ); |
d03bd989 |
89 | |
c32c2c61 |
90 | if ( $class ne $new_class ) { |
91 | if ( $new_class->can("interpolate_class") ) { |
aa4c3a8d |
92 | return $new_class->interpolate_class($options); |
c32c2c61 |
93 | } else { |
94 | $class = $new_class; |
95 | } |
96 | } |
d5c30e52 |
97 | } |
98 | |
c32c2c61 |
99 | my @traits; |
100 | |
aa4c3a8d |
101 | if (my $traits = $options->{traits}) { |
8974015d |
102 | my $i = 0; |
103 | while ($i < @$traits) { |
104 | my $trait = $traits->[$i++]; |
105 | next if ref($trait); # options to a trait we discarded |
106 | |
107 | $trait = Moose::Util::resolve_metatrait_alias(Attribute => $trait) |
108 | || $trait; |
109 | |
110 | next if $class->does($trait); |
111 | |
112 | push @traits, $trait; |
113 | |
114 | # are there options? |
115 | push @traits, $traits->[$i++] |
116 | if $traits->[$i] && ref($traits->[$i]); |
117 | } |
965743fb |
118 | |
119 | if (@traits) { |
c32c2c61 |
120 | my $anon_class = Moose::Meta::Class->create_anon_class( |
121 | superclasses => [ $class ], |
122 | roles => [ @traits ], |
123 | cache => 1, |
124 | ); |
125 | |
126 | $class = $anon_class->name; |
127 | } |
d5c30e52 |
128 | } |
c32c2c61 |
129 | |
130 | return ( wantarray ? ( $class, @traits ) : $class ); |
d5c30e52 |
131 | } |
132 | |
e606ae5f |
133 | # ... |
134 | |
ec835085 |
135 | # method-generating options shouldn't be overridden |
136 | sub illegal_options_for_inheritance { |
d21262bd |
137 | qw(reader writer accessor clearer predicate) |
ec835085 |
138 | } |
e606ae5f |
139 | |
140 | # NOTE/TODO |
d03bd989 |
141 | # This method *must* be able to handle |
142 | # Class::MOP::Attribute instances as |
143 | # well. Yes, I know that is wrong, but |
144 | # apparently we didn't realize it was |
145 | # doing that and now we have some code |
146 | # which is dependent on it. The real |
147 | # solution of course is to push this |
e606ae5f |
148 | # feature back up into Class::MOP::Attribute |
149 | # but I not right now, I am too lazy. |
d03bd989 |
150 | # However if you are reading this and |
151 | # looking for something to do,.. please |
e606ae5f |
152 | # be my guest. |
153 | # - stevan |
ce0e8d63 |
154 | sub clone_and_inherit_options { |
155 | my ($self, %options) = @_; |
d03bd989 |
156 | |
e606ae5f |
157 | # NOTE: |
158 | # we may want to extends a Class::MOP::Attribute |
d03bd989 |
159 | # in which case we need to be able to use the |
160 | # core set of legal options that have always |
e606ae5f |
161 | # been here. But we allows Moose::Meta::Attribute |
162 | # instances to changes them. |
163 | # - SL |
7782e1da |
164 | my @illegal_options = $self->can('illegal_options_for_inheritance') |
165 | ? $self->illegal_options_for_inheritance |
166 | : (); |
167 | |
ec835085 |
168 | my @found_illegal_options = grep { exists $options{$_} && exists $self->{$_} ? $_ : undef } @illegal_options; |
7782e1da |
169 | (scalar @found_illegal_options == 0) |
170 | || $self->throw_error("Illegal inherited options => (" . (join ', ' => @found_illegal_options) . ")", data => \%options); |
26fbace8 |
171 | |
ce0e8d63 |
172 | if ($options{isa}) { |
173 | my $type_constraint; |
8de73ff1 |
174 | if (blessed($options{isa}) && $options{isa}->isa('Moose::Meta::TypeConstraint')) { |
175 | $type_constraint = $options{isa}; |
176 | } |
177 | else { |
d40ce9d5 |
178 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options{isa}); |
8de73ff1 |
179 | (defined $type_constraint) |
be05faea |
180 | || $self->throw_error("Could not find the type constraint '" . $options{isa} . "'", data => $options{isa}); |
8de73ff1 |
181 | } |
5e98d2b6 |
182 | |
7782e1da |
183 | $options{type_constraint} = $type_constraint; |
ce0e8d63 |
184 | } |
d03bd989 |
185 | |
2ea379cb |
186 | if ($options{does}) { |
187 | my $type_constraint; |
188 | if (blessed($options{does}) && $options{does}->isa('Moose::Meta::TypeConstraint')) { |
189 | $type_constraint = $options{does}; |
190 | } |
191 | else { |
d40ce9d5 |
192 | $type_constraint = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options{does}); |
2ea379cb |
193 | (defined $type_constraint) |
be05faea |
194 | || $self->throw_error("Could not find the type constraint '" . $options{does} . "'", data => $options{does}); |
2ea379cb |
195 | } |
196 | |
7782e1da |
197 | $options{type_constraint} = $type_constraint; |
d03bd989 |
198 | } |
c32c2c61 |
199 | |
cbd141ca |
200 | # NOTE: |
d03bd989 |
201 | # this doesn't apply to Class::MOP::Attributes, |
cbd141ca |
202 | # so we can ignore it for them. |
203 | # - SL |
204 | if ($self->can('interpolate_class')) { |
7782e1da |
205 | ( $options{metaclass}, my @traits ) = $self->interpolate_class(\%options); |
c32c2c61 |
206 | |
cbd141ca |
207 | my %seen; |
208 | my @all_traits = grep { $seen{$_}++ } @{ $self->applied_traits || [] }, @traits; |
7782e1da |
209 | $options{traits} = \@all_traits if @all_traits; |
cbd141ca |
210 | } |
c32c2c61 |
211 | |
7782e1da |
212 | $self->clone(%options); |
1d768fb1 |
213 | } |
214 | |
c32c2c61 |
215 | sub clone { |
216 | my ( $self, %params ) = @_; |
217 | |
aa4c3a8d |
218 | my $class = delete $params{metaclass} || ref $self; |
c32c2c61 |
219 | |
db72153d |
220 | my ( @init, @non_init ); |
c32c2c61 |
221 | |
0772362a |
222 | foreach my $attr ( grep { $_->has_value($self) } Class::MOP::class_of($self)->get_all_attributes ) { |
db72153d |
223 | push @{ $attr->has_init_arg ? \@init : \@non_init }, $attr; |
224 | } |
c32c2c61 |
225 | |
db72153d |
226 | my %new_params = ( ( map { $_->init_arg => $_->get_value($self) } @init ), %params ); |
c32c2c61 |
227 | |
db72153d |
228 | my $name = delete $new_params{name}; |
c32c2c61 |
229 | |
db72153d |
230 | my $clone = $class->new($name, %new_params, __hack_no_process_options => 1 ); |
c32c2c61 |
231 | |
db72153d |
232 | foreach my $attr ( @non_init ) { |
233 | $attr->set_value($clone, $attr->get_value($self)); |
c32c2c61 |
234 | } |
db72153d |
235 | |
236 | return $clone; |
c32c2c61 |
237 | } |
238 | |
1d768fb1 |
239 | sub _process_options { |
240 | my ($class, $name, $options) = @_; |
8de73ff1 |
241 | |
f3c4e20e |
242 | if (exists $options->{is}) { |
21f1e231 |
243 | |
012fcbd1 |
244 | ### ------------------------- |
245 | ## is => ro, writer => _foo # turns into (reader => foo, writer => _foo) as before |
246 | ## is => rw, writer => _foo # turns into (reader => foo, writer => _foo) |
247 | ## is => rw, accessor => _foo # turns into (accessor => _foo) |
248 | ## is => ro, accessor => _foo # error, accesor is rw |
249 | ### ------------------------- |
d03bd989 |
250 | |
8de73ff1 |
251 | if ($options->{is} eq 'ro') { |
be05faea |
252 | $class->throw_error("Cannot define an accessor name on a read-only attribute, accessors are read/write", data => $options) |
21f1e231 |
253 | if exists $options->{accessor}; |
8de73ff1 |
254 | $options->{reader} ||= $name; |
8de73ff1 |
255 | } |
256 | elsif ($options->{is} eq 'rw') { |
21f1e231 |
257 | if ($options->{writer}) { |
258 | $options->{reader} ||= $name; |
259 | } |
260 | else { |
261 | $options->{accessor} ||= $name; |
262 | } |
8de73ff1 |
263 | } |
ccd4cff9 |
264 | elsif ($options->{is} eq 'bare') { |
265 | # do nothing, but don't complain (later) about missing methods |
266 | } |
8de73ff1 |
267 | else { |
e606ae5f |
268 | $class->throw_error("I do not understand this option (is => " . $options->{is} . ") on attribute ($name)", data => $options->{is}); |
8de73ff1 |
269 | } |
f3c4e20e |
270 | } |
8de73ff1 |
271 | |
f3c4e20e |
272 | if (exists $options->{isa}) { |
f3c4e20e |
273 | if (exists $options->{does}) { |
1454efcc |
274 | if (try { $options->{isa}->can('does') }) { |
f3c4e20e |
275 | ($options->{isa}->does($options->{does})) |
e606ae5f |
276 | || $class->throw_error("Cannot have an isa option and a does option if the isa does not do the does on attribute ($name)", data => $options); |
f3c4e20e |
277 | } |
278 | else { |
e606ae5f |
279 | $class->throw_error("Cannot have an isa option which cannot ->does() on attribute ($name)", data => $options); |
26fbace8 |
280 | } |
26fbace8 |
281 | } |
8de73ff1 |
282 | |
f3c4e20e |
283 | # allow for anon-subtypes here ... |
284 | if (blessed($options->{isa}) && $options->{isa}->isa('Moose::Meta::TypeConstraint')) { |
8de73ff1 |
285 | $options->{type_constraint} = $options->{isa}; |
286 | } |
287 | else { |
620db045 |
288 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_isa_type_constraint($options->{isa}); |
8de73ff1 |
289 | } |
f3c4e20e |
290 | } |
291 | elsif (exists $options->{does}) { |
292 | # allow for anon-subtypes here ... |
293 | if (blessed($options->{does}) && $options->{does}->isa('Moose::Meta::TypeConstraint')) { |
238b424d |
294 | $options->{type_constraint} = $options->{does}; |
8de73ff1 |
295 | } |
296 | else { |
620db045 |
297 | $options->{type_constraint} = Moose::Util::TypeConstraints::find_or_create_does_type_constraint($options->{does}); |
8de73ff1 |
298 | } |
f3c4e20e |
299 | } |
8de73ff1 |
300 | |
f3c4e20e |
301 | if (exists $options->{coerce} && $options->{coerce}) { |
302 | (exists $options->{type_constraint}) |
e606ae5f |
303 | || $class->throw_error("You cannot have coercion without specifying a type constraint on attribute ($name)", data => $options); |
304 | $class->throw_error("You cannot have a weak reference to a coerced value on attribute ($name)", data => $options) |
8de73ff1 |
305 | if $options->{weak_ref}; |
2b54d2a6 |
306 | |
470bc652 |
307 | unless ( $options->{type_constraint}->has_coercion ) { |
308 | my $type = $options->{type_constraint}->name; |
f1309155 |
309 | |
310 | Moose::Deprecated::deprecated( |
311 | feature => 'coerce without coercion', |
312 | message => |
313 | "You cannot coerce an attribute ($name) unless its type ($type) has a coercion" |
314 | ); |
470bc652 |
315 | } |
f3c4e20e |
316 | } |
8de73ff1 |
317 | |
0b7df53c |
318 | if (exists $options->{trigger}) { |
21f1e231 |
319 | ('CODE' eq ref $options->{trigger}) |
e606ae5f |
320 | || $class->throw_error("Trigger must be a CODE ref on attribute ($name)", data => $options->{trigger}); |
0b7df53c |
321 | } |
322 | |
f3c4e20e |
323 | if (exists $options->{auto_deref} && $options->{auto_deref}) { |
324 | (exists $options->{type_constraint}) |
e606ae5f |
325 | || $class->throw_error("You cannot auto-dereference without specifying a type constraint on attribute ($name)", data => $options); |
f3c4e20e |
326 | ($options->{type_constraint}->is_a_type_of('ArrayRef') || |
8de73ff1 |
327 | $options->{type_constraint}->is_a_type_of('HashRef')) |
e606ae5f |
328 | || $class->throw_error("You cannot auto-dereference anything other than a ArrayRef or HashRef on attribute ($name)", data => $options); |
f3c4e20e |
329 | } |
8de73ff1 |
330 | |
f3c4e20e |
331 | if (exists $options->{lazy_build} && $options->{lazy_build} == 1) { |
e606ae5f |
332 | $class->throw_error("You can not use lazy_build and default for the same attribute ($name)", data => $options) |
8de73ff1 |
333 | if exists $options->{default}; |
a6c84c69 |
334 | $options->{lazy} = 1; |
a6c84c69 |
335 | $options->{builder} ||= "_build_${name}"; |
336 | if ($name =~ /^_/) { |
f3c4e20e |
337 | $options->{clearer} ||= "_clear${name}"; |
338 | $options->{predicate} ||= "_has${name}"; |
d03bd989 |
339 | } |
a6c84c69 |
340 | else { |
f3c4e20e |
341 | $options->{clearer} ||= "clear_${name}"; |
342 | $options->{predicate} ||= "has_${name}"; |
26fbace8 |
343 | } |
f3c4e20e |
344 | } |
8de73ff1 |
345 | |
f3c4e20e |
346 | if (exists $options->{lazy} && $options->{lazy}) { |
9edba990 |
347 | (exists $options->{default} || defined $options->{builder} ) |
be05faea |
348 | || $class->throw_error("You cannot have lazy attribute ($name) without specifying a default value for it", data => $options); |
f3c4e20e |
349 | } |
26fbace8 |
350 | |
9edba990 |
351 | if ( $options->{required} && !( ( !exists $options->{init_arg} || defined $options->{init_arg} ) || exists $options->{default} || defined $options->{builder} ) ) { |
be05faea |
352 | $class->throw_error("You cannot have a required attribute ($name) without a default, builder, or an init_arg", data => $options); |
9edba990 |
353 | } |
354 | |
78cd1d3b |
355 | } |
c0e30cf5 |
356 | |
d500266f |
357 | sub initialize_instance_slot { |
ddd0ec20 |
358 | my ($self, $meta_instance, $instance, $params) = @_; |
d500266f |
359 | my $init_arg = $self->init_arg(); |
360 | # try to fetch the init arg from the %params ... |
ddd0ec20 |
361 | |
26fbace8 |
362 | my $val; |
1ed0b94f |
363 | my $value_is_set; |
625d571f |
364 | if ( defined($init_arg) and exists $params->{$init_arg}) { |
d500266f |
365 | $val = $params->{$init_arg}; |
d03bd989 |
366 | $value_is_set = 1; |
d500266f |
367 | } |
368 | else { |
369 | # skip it if it's lazy |
370 | return if $self->is_lazy; |
371 | # and die if it's required and doesn't have a default value |
be05faea |
372 | $self->throw_error("Attribute (" . $self->name . ") is required", object => $instance, data => $params) |
26fbace8 |
373 | if $self->is_required && !$self->has_default && !$self->has_builder; |
ddd0ec20 |
374 | |
1ed0b94f |
375 | # if nothing was in the %params, we can use the |
376 | # attribute's default value (if it has one) |
377 | if ($self->has_default) { |
378 | $val = $self->default($instance); |
379 | $value_is_set = 1; |
d03bd989 |
380 | } |
a6c84c69 |
381 | elsif ($self->has_builder) { |
e606ae5f |
382 | $val = $self->_call_builder($instance); |
383 | $value_is_set = 1; |
a0748c37 |
384 | } |
26fbace8 |
385 | } |
386 | |
1ed0b94f |
387 | return unless $value_is_set; |
388 | |
9c9563c7 |
389 | $val = $self->_coerce_and_verify( $val, $instance ); |
ddd0ec20 |
390 | |
759e4e8f |
391 | $self->set_initial_value($instance, $val); |
312e0f0c |
392 | |
393 | if ( ref $val && $self->is_weak_ref ) { |
32881f68 |
394 | $self->_weaken_value($instance); |
312e0f0c |
395 | } |
d500266f |
396 | } |
397 | |
e606ae5f |
398 | sub _call_builder { |
399 | my ( $self, $instance ) = @_; |
400 | |
401 | my $builder = $self->builder(); |
402 | |
403 | return $instance->$builder() |
404 | if $instance->can( $self->builder ); |
405 | |
406 | $self->throw_error( blessed($instance) |
407 | . " does not support builder method '" |
408 | . $self->builder |
409 | . "' for attribute '" |
410 | . $self->name |
411 | . "'", |
412 | object => $instance, |
413 | ); |
414 | } |
415 | |
d617b644 |
416 | ## Slot management |
9e93dd19 |
417 | |
8abe9636 |
418 | # FIXME: |
d03bd989 |
419 | # this duplicates too much code from |
420 | # Class::MOP::Attribute, we need to |
8abe9636 |
421 | # refactor these bits eventually. |
422 | # - SL |
423 | sub _set_initial_slot_value { |
424 | my ($self, $meta_instance, $instance, $value) = @_; |
425 | |
426 | my $slot_name = $self->name; |
427 | |
428 | return $meta_instance->set_slot_value($instance, $slot_name, $value) |
429 | unless $self->has_initializer; |
430 | |
8abe9636 |
431 | my $callback = sub { |
9c9563c7 |
432 | my $val = $self->_coerce_and_verify( shift, $instance );; |
433 | |
8abe9636 |
434 | $meta_instance->set_slot_value($instance, $slot_name, $val); |
435 | }; |
d03bd989 |
436 | |
8abe9636 |
437 | my $initializer = $self->initializer; |
438 | |
439 | # most things will just want to set a value, so make it first arg |
440 | $instance->$initializer($value, $callback, $self); |
441 | } |
442 | |
946289d1 |
443 | sub set_value { |
b6af66f8 |
444 | my ($self, $instance, @args) = @_; |
445 | my $value = $args[0]; |
26fbace8 |
446 | |
946289d1 |
447 | my $attr_name = $self->name; |
26fbace8 |
448 | |
b6af66f8 |
449 | if ($self->is_required and not @args) { |
be05faea |
450 | $self->throw_error("Attribute ($attr_name) is required", object => $instance); |
946289d1 |
451 | } |
26fbace8 |
452 | |
9c9563c7 |
453 | $value = $self->_coerce_and_verify( $value, $instance ); |
26fbace8 |
454 | |
3dda07f5 |
455 | my @old; |
456 | if ( $self->has_trigger && $self->has_value($instance) ) { |
457 | @old = $self->get_value($instance, 'for trigger'); |
458 | } |
459 | |
312e0f0c |
460 | $self->SUPER::set_value($instance, $value); |
26fbace8 |
461 | |
312e0f0c |
462 | if ( ref $value && $self->is_weak_ref ) { |
32881f68 |
463 | $self->_weaken_value($instance); |
946289d1 |
464 | } |
26fbace8 |
465 | |
946289d1 |
466 | if ($self->has_trigger) { |
3dda07f5 |
467 | $self->trigger->($instance, $value, @old); |
946289d1 |
468 | } |
469 | } |
470 | |
32881f68 |
471 | sub _weaken_value { |
312e0f0c |
472 | my ( $self, $instance ) = @_; |
473 | |
32881f68 |
474 | my $meta_instance = Class::MOP::Class->initialize( blessed($instance) ) |
475 | ->get_meta_instance; |
312e0f0c |
476 | |
477 | $meta_instance->weaken_slot_value( $instance, $self->name ); |
478 | } |
479 | |
946289d1 |
480 | sub get_value { |
3dda07f5 |
481 | my ($self, $instance, $for_trigger) = @_; |
26fbace8 |
482 | |
946289d1 |
483 | if ($self->is_lazy) { |
8de73ff1 |
484 | unless ($self->has_value($instance)) { |
e606ae5f |
485 | my $value; |
8de73ff1 |
486 | if ($self->has_default) { |
e606ae5f |
487 | $value = $self->default($instance); |
3f11800d |
488 | } elsif ( $self->has_builder ) { |
e606ae5f |
489 | $value = $self->_call_builder($instance); |
490 | } |
9c9563c7 |
491 | |
492 | $value = $self->_coerce_and_verify( $value, $instance ); |
493 | |
e606ae5f |
494 | $self->set_initial_value($instance, $value); |
8de73ff1 |
495 | } |
946289d1 |
496 | } |
26fbace8 |
497 | |
3dda07f5 |
498 | if ( $self->should_auto_deref && ! $for_trigger ) { |
26fbace8 |
499 | |
946289d1 |
500 | my $type_constraint = $self->type_constraint; |
501 | |
502 | if ($type_constraint->is_a_type_of('ArrayRef')) { |
503 | my $rv = $self->SUPER::get_value($instance); |
504 | return unless defined $rv; |
505 | return wantarray ? @{ $rv } : $rv; |
26fbace8 |
506 | } |
946289d1 |
507 | elsif ($type_constraint->is_a_type_of('HashRef')) { |
508 | my $rv = $self->SUPER::get_value($instance); |
509 | return unless defined $rv; |
510 | return wantarray ? %{ $rv } : $rv; |
26fbace8 |
511 | } |
946289d1 |
512 | else { |
46cb090f |
513 | $self->throw_error("Can not auto de-reference the type constraint '" . $type_constraint->name . "'", object => $instance, type_constraint => $type_constraint); |
946289d1 |
514 | } |
26fbace8 |
515 | |
946289d1 |
516 | } |
517 | else { |
26fbace8 |
518 | |
946289d1 |
519 | return $self->SUPER::get_value($instance); |
26fbace8 |
520 | } |
946289d1 |
521 | } |
a15dff8d |
522 | |
26fbace8 |
523 | ## installing accessors |
c0e30cf5 |
524 | |
246bbeef |
525 | sub accessor_metaclass { 'Moose::Meta::Method::Accessor' } |
526 | |
527 | sub install_accessors { |
ae907ae0 |
528 | my $self = shift; |
246bbeef |
529 | $self->SUPER::install_accessors(@_); |
530 | $self->install_delegation if $self->has_handles; |
28af3424 |
531 | return; |
532 | } |
533 | |
9340e346 |
534 | sub _check_associated_methods { |
28af3424 |
535 | my $self = shift; |
86cf196b |
536 | unless ( |
0bbd378f |
537 | @{ $self->associated_methods } |
86cf196b |
538 | || ($self->_is_metadata || '') eq 'bare' |
539 | ) { |
540 | Carp::cluck( |
8f4450f3 |
541 | 'Attribute (' . $self->name . ') of class ' |
542 | . $self->associated_class->name |
543 | . ' has no associated methods' |
86cf196b |
544 | . ' (did you mean to provide an "is" argument?)' |
545 | . "\n" |
546 | ) |
547 | } |
e606ae5f |
548 | } |
26fbace8 |
549 | |
3b6e2290 |
550 | sub _process_accessors { |
551 | my $self = shift; |
552 | my ($type, $accessor, $generate_as_inline_methods) = @_; |
553 | $accessor = (keys %$accessor)[0] if (ref($accessor)||'') eq 'HASH'; |
99541dfd |
554 | my $method = $self->associated_class->get_method($accessor); |
555 | if ($method && !$method->isa('Class::MOP::Method::Accessor') |
556 | && (!$self->definition_context |
557 | || $method->package_name eq $self->definition_context->{package})) { |
3b6e2290 |
558 | Carp::cluck( |
1d18c898 |
559 | "You are overwriting a locally defined method ($accessor) with " |
3b6e2290 |
560 | . "an accessor" |
561 | ); |
562 | } |
3968746e |
563 | if (!$self->associated_class->has_method($accessor) |
564 | && $self->associated_class->has_package_symbol('&' . $accessor)) { |
565 | Carp::cluck( |
566 | "You are overwriting a locally defined function ($accessor) with " |
567 | . "an accessor" |
568 | ); |
569 | } |
3b6e2290 |
570 | $self->SUPER::_process_accessors(@_); |
e606ae5f |
571 | } |
26fbace8 |
572 | |
e1d6f0a3 |
573 | sub remove_accessors { |
574 | my $self = shift; |
575 | $self->SUPER::remove_accessors(@_); |
576 | $self->remove_delegation if $self->has_handles; |
577 | return; |
578 | } |
579 | |
e606ae5f |
580 | sub install_delegation { |
581 | my $self = shift; |
26fbace8 |
582 | |
e606ae5f |
583 | # NOTE: |
584 | # Here we canonicalize the 'handles' option |
585 | # this will sort out any details and always |
586 | # return an hash of methods which we want |
587 | # to delagate to, see that method for details |
588 | my %handles = $self->_canonicalize_handles; |
589 | |
e606ae5f |
590 | |
591 | # install the delegation ... |
592 | my $associated_class = $self->associated_class; |
593 | foreach my $handle (keys %handles) { |
594 | my $method_to_call = $handles{$handle}; |
595 | my $class_name = $associated_class->name; |
596 | my $name = "${class_name}::${handle}"; |
26fbace8 |
597 | |
452bac1b |
598 | (!$associated_class->has_method($handle)) |
cee532a1 |
599 | || $self->throw_error("You cannot overwrite a locally defined method ($handle) with a delegation", method_name => $handle); |
26fbace8 |
600 | |
e606ae5f |
601 | # NOTE: |
602 | # handles is not allowed to delegate |
603 | # any of these methods, as they will |
604 | # override the ones in your class, which |
605 | # is almost certainly not what you want. |
4fe78472 |
606 | |
e606ae5f |
607 | # FIXME warn when $handle was explicitly specified, but not if the source is a regex or something |
608 | #cluck("Not delegating method '$handle' because it is a core method") and |
609 | next if $class_name->isa("Moose::Object") and $handle =~ /^BUILD|DEMOLISH$/ || Moose::Object->can($handle); |
26fbace8 |
610 | |
46f7e6a5 |
611 | my $method = $self->_make_delegation_method($handle, $method_to_call); |
a05f85c1 |
612 | |
613 | $self->associated_class->add_method($method->name, $method); |
0bbd378f |
614 | $self->associate_method($method); |
d03bd989 |
615 | } |
452bac1b |
616 | } |
617 | |
e1d6f0a3 |
618 | sub remove_delegation { |
619 | my $self = shift; |
620 | my %handles = $self->_canonicalize_handles; |
621 | my $associated_class = $self->associated_class; |
622 | foreach my $handle (keys %handles) { |
684323b3 |
623 | next unless any { $handle eq $_ } |
624 | map { $_->name } |
625 | @{ $self->associated_methods }; |
e1d6f0a3 |
626 | $self->associated_class->remove_method($handle); |
627 | } |
628 | } |
629 | |
98aae381 |
630 | # private methods to help delegation ... |
631 | |
452bac1b |
632 | sub _canonicalize_handles { |
633 | my $self = shift; |
634 | my $handles = $self->handles; |
c84f324f |
635 | if (my $handle_type = ref($handles)) { |
636 | if ($handle_type eq 'HASH') { |
637 | return %{$handles}; |
638 | } |
639 | elsif ($handle_type eq 'ARRAY') { |
640 | return map { $_ => $_ } @{$handles}; |
641 | } |
642 | elsif ($handle_type eq 'Regexp') { |
643 | ($self->has_type_constraint) |
0286711b |
644 | || $self->throw_error("Cannot delegate methods based on a Regexp without a type constraint (isa)", data => $handles); |
26fbace8 |
645 | return map { ($_ => $_) } |
c84f324f |
646 | grep { /$handles/ } $self->_get_delegate_method_list; |
647 | } |
648 | elsif ($handle_type eq 'CODE') { |
649 | return $handles->($self, $self->_find_delegate_metaclass); |
650 | } |
6cbf4a23 |
651 | elsif (blessed($handles) && $handles->isa('Moose::Meta::TypeConstraint::DuckType')) { |
652 | return map { $_ => $_ } @{ $handles->methods }; |
653 | } |
c7761602 |
654 | elsif (blessed($handles) && $handles->isa('Moose::Meta::TypeConstraint::Role')) { |
655 | $handles = $handles->role; |
656 | } |
c84f324f |
657 | else { |
be05faea |
658 | $self->throw_error("Unable to canonicalize the 'handles' option with $handles", data => $handles); |
c84f324f |
659 | } |
452bac1b |
660 | } |
c84f324f |
661 | |
c7761602 |
662 | Class::MOP::load_class($handles); |
663 | my $role_meta = Class::MOP::class_of($handles); |
d03bd989 |
664 | |
c7761602 |
665 | (blessed $role_meta && $role_meta->isa('Moose::Meta::Role')) |
666 | || $self->throw_error("Unable to canonicalize the 'handles' option with $handles because its metaclass is not a Moose::Meta::Role", data => $handles); |
667 | |
668 | return map { $_ => $_ } |
669 | grep { $_ ne 'meta' } ( |
670 | $role_meta->get_method_list, |
671 | map { $_->name } $role_meta->get_required_method_list, |
672 | ); |
452bac1b |
673 | } |
674 | |
675 | sub _find_delegate_metaclass { |
676 | my $self = shift; |
98aae381 |
677 | if (my $class = $self->_isa_metadata) { |
9031e2c4 |
678 | # we might be dealing with a non-Moose class, |
679 | # and need to make our own metaclass. if there's |
680 | # already a metaclass, it will be returned |
88389e14 |
681 | return Class::MOP::Class->initialize($class); |
452bac1b |
682 | } |
98aae381 |
683 | elsif (my $role = $self->_does_metadata) { |
91e6653b |
684 | return Class::MOP::class_of($role); |
452bac1b |
685 | } |
686 | else { |
be05faea |
687 | $self->throw_error("Cannot find delegate metaclass for attribute " . $self->name); |
452bac1b |
688 | } |
689 | } |
690 | |
691 | sub _get_delegate_method_list { |
692 | my $self = shift; |
693 | my $meta = $self->_find_delegate_metaclass; |
694 | if ($meta->isa('Class::MOP::Class')) { |
e606ae5f |
695 | return map { $_->name } # NOTE: !never! delegate &meta |
696 | grep { $_->package_name ne 'Moose::Object' && $_->name ne 'meta' } |
697 | $meta->get_all_methods; |
452bac1b |
698 | } |
699 | elsif ($meta->isa('Moose::Meta::Role')) { |
26fbace8 |
700 | return $meta->get_method_list; |
452bac1b |
701 | } |
702 | else { |
be05faea |
703 | $self->throw_error("Unable to recognize the delegate metaclass '$meta'", data => $meta); |
452bac1b |
704 | } |
705 | } |
706 | |
bd1226e2 |
707 | sub delegation_metaclass { 'Moose::Meta::Method::Delegation' } |
708 | |
a05f85c1 |
709 | sub _make_delegation_method { |
46f7e6a5 |
710 | my ( $self, $handle_name, $method_to_call ) = @_; |
a05f85c1 |
711 | |
3c573ca4 |
712 | my @curried_arguments; |
2de18801 |
713 | |
3c573ca4 |
714 | ($method_to_call, @curried_arguments) = @$method_to_call |
2de18801 |
715 | if 'ARRAY' eq ref($method_to_call); |
716 | |
bd1226e2 |
717 | return $self->delegation_metaclass->new( |
46f7e6a5 |
718 | name => $handle_name, |
719 | package_name => $self->associated_class->name, |
720 | attribute => $self, |
721 | delegate_to_method => $method_to_call, |
3c573ca4 |
722 | curried_arguments => \@curried_arguments, |
a05f85c1 |
723 | ); |
724 | } |
725 | |
9c9563c7 |
726 | sub _coerce_and_verify { |
727 | my $self = shift; |
728 | my $val = shift; |
729 | my $instance = shift; |
730 | |
731 | return $val unless $self->has_type_constraint; |
732 | |
2b54d2a6 |
733 | $val = $self->type_constraint->coerce($val) |
5aab256d |
734 | if $self->should_coerce && $self->type_constraint->has_coercion; |
9c9563c7 |
735 | |
736 | $self->verify_against_type_constraint($val, instance => $instance); |
737 | |
738 | return $val; |
739 | } |
740 | |
5755a9b2 |
741 | sub verify_against_type_constraint { |
2b86e02b |
742 | my $self = shift; |
743 | my $val = shift; |
744 | |
745 | return 1 if !$self->has_type_constraint; |
746 | |
747 | my $type_constraint = $self->type_constraint; |
748 | |
749 | $type_constraint->check($val) |
750 | || $self->throw_error("Attribute (" |
751 | . $self->name |
752 | . ") does not pass the type constraint because: " |
753 | . $type_constraint->get_message($val), data => $val, @_); |
754 | } |
755 | |
21f1e231 |
756 | package Moose::Meta::Attribute::Custom::Moose; |
757 | sub register_implementation { 'Moose::Meta::Attribute' } |
758 | |
c0e30cf5 |
759 | 1; |
760 | |
761 | __END__ |
762 | |
763 | =pod |
764 | |
765 | =head1 NAME |
766 | |
6ba6d68c |
767 | Moose::Meta::Attribute - The Moose attribute metaclass |
c0e30cf5 |
768 | |
769 | =head1 DESCRIPTION |
770 | |
93a708fd |
771 | This class is a subclass of L<Class::MOP::Attribute> that provides |
772 | additional Moose-specific functionality. |
6ba6d68c |
773 | |
7854b409 |
774 | To really understand this class, you will need to start with the |
775 | L<Class::MOP::Attribute> documentation. This class can be understood |
776 | as a set of additional features on top of the basic feature provided |
777 | by that parent class. |
e522431d |
778 | |
d4b1449e |
779 | =head1 INHERITANCE |
780 | |
781 | C<Moose::Meta::Attribute> is a subclass of L<Class::MOP::Attribute>. |
782 | |
c0e30cf5 |
783 | =head1 METHODS |
784 | |
93a708fd |
785 | Many of the documented below override methods in |
786 | L<Class::MOP::Attribute> and add Moose specific features. |
6ba6d68c |
787 | |
93a708fd |
788 | =head2 Creation |
6ba6d68c |
789 | |
c0e30cf5 |
790 | =over 4 |
791 | |
93a708fd |
792 | =item B<< Moose::Meta::Attribute->new(%options) >> |
c0e30cf5 |
793 | |
93a708fd |
794 | This method overrides the L<Class::MOP::Attribute> constructor. |
c32c2c61 |
795 | |
93a708fd |
796 | Many of the options below are described in more detail in the |
797 | L<Moose::Manual::Attributes> document. |
6e2840b7 |
798 | |
93a708fd |
799 | It adds the following options to the constructor: |
d500266f |
800 | |
93a708fd |
801 | =over 8 |
452bac1b |
802 | |
996b8c8d |
803 | =item * is => 'ro', 'rw', 'bare' |
e1d6f0a3 |
804 | |
93a708fd |
805 | This provides a shorthand for specifying the C<reader>, C<writer>, or |
806 | C<accessor> names. If the attribute is read-only ('ro') then it will |
807 | have a C<reader> method with the same attribute as the name. |
e606ae5f |
808 | |
93a708fd |
809 | If it is read-write ('rw') then it will have an C<accessor> method |
810 | with the same name. If you provide an explicit C<writer> for a |
811 | read-write attribute, then you will have a C<reader> with the same |
812 | name as the attribute, and a C<writer> with the name you provided. |
e1d6f0a3 |
813 | |
996b8c8d |
814 | Use 'bare' when you are deliberately not installing any methods |
815 | (accessor, reader, etc.) associated with this attribute; otherwise, |
816 | Moose will issue a deprecation warning when this attribute is added to a |
9340e346 |
817 | metaclass. |
996b8c8d |
818 | |
93a708fd |
819 | =item * isa => $type |
39b3bc94 |
820 | |
93a708fd |
821 | This option accepts a type. The type can be a string, which should be |
822 | a type name. If the type name is unknown, it is assumed to be a class |
823 | name. |
824 | |
825 | This option can also accept a L<Moose::Meta::TypeConstraint> object. |
826 | |
827 | If you I<also> provide a C<does> option, then your C<isa> option must |
828 | be a class name, and that class must do the role specified with |
829 | C<does>. |
830 | |
831 | =item * does => $role |
832 | |
833 | This is short-hand for saying that the attribute's type must be an |
834 | object which does the named role. |
835 | |
836 | =item * coerce => $bool |
837 | |
838 | This option is only valid for objects with a type constraint |
3b98ba07 |
839 | (C<isa>) that defined a coercion. If this is true, then coercions will be applied whenever |
93a708fd |
840 | this attribute is set. |
841 | |
842 | You can make both this and the C<weak_ref> option true. |
843 | |
844 | =item * trigger => $sub |
845 | |
846 | This option accepts a subroutine reference, which will be called after |
847 | the attribute is set. |
848 | |
849 | =item * required => $bool |
850 | |
851 | An attribute which is required must be provided to the constructor. An |
852 | attribute which is required can also have a C<default> or C<builder>, |
36741534 |
853 | which will satisfy its required-ness. |
93a708fd |
854 | |
855 | A required attribute must have a C<default>, C<builder> or a |
856 | non-C<undef> C<init_arg> |
857 | |
858 | =item * lazy => $bool |
859 | |
860 | A lazy attribute must have a C<default> or C<builder>. When an |
861 | attribute is lazy, the default value will not be calculated until the |
862 | attribute is read. |
863 | |
864 | =item * weak_ref => $bool |
865 | |
866 | If this is true, the attribute's value will be stored as a weak |
867 | reference. |
868 | |
869 | =item * auto_deref => $bool |
870 | |
871 | If this is true, then the reader will dereference the value when it is |
872 | called. The attribute must have a type constraint which defines the |
873 | attribute as an array or hash reference. |
874 | |
875 | =item * lazy_build => $bool |
876 | |
877 | Setting this to true makes the attribute lazy and provides a number of |
878 | default methods. |
879 | |
880 | has 'size' => ( |
881 | is => 'ro', |
882 | lazy_build => 1, |
883 | ); |
884 | |
885 | is equivalent to this: |
886 | |
887 | has 'size' => ( |
888 | is => 'ro', |
889 | lazy => 1, |
890 | builder => '_build_size', |
891 | clearer => 'clear_size', |
892 | predicate => 'has_size', |
893 | ); |
894 | |
895 | =item * documentation |
896 | |
897 | An arbitrary string that can be retrieved later by calling C<< |
898 | $attr->documentation >>. |
899 | |
900 | =back |
901 | |
902 | =item B<< $attr->clone(%options) >> |
903 | |
904 | This creates a new attribute based on attribute being cloned. You must |
905 | supply a C<name> option to provide a new name for the attribute. |
906 | |
907 | The C<%options> can only specify options handled by |
908 | L<Class::MOP::Attribute>. |
909 | |
36741534 |
910 | =back |
911 | |
93a708fd |
912 | =head2 Value management |
913 | |
36741534 |
914 | =over 4 |
915 | |
93a708fd |
916 | =item B<< $attr->initialize_instance_slot($meta_instance, $instance, $params) >> |
917 | |
918 | This method is used internally to initialize the attribute's slot in |
919 | the object C<$instance>. |
920 | |
921 | This overrides the L<Class::MOP::Attribute> method to handle lazy |
922 | attributes, weak references, and type constraints. |
bd1226e2 |
923 | |
946289d1 |
924 | =item B<get_value> |
925 | |
926 | =item B<set_value> |
927 | |
6549b0d1 |
928 | eval { $point->meta->get_attribute('x')->set_value($point, 'forty-two') }; |
bcbaa845 |
929 | if($@) { |
930 | print "Oops: $@\n"; |
931 | } |
932 | |
6549b0d1 |
933 | I<Attribute (x) does not pass the type constraint (Int) with 'forty-two'> |
bcbaa845 |
934 | |
935 | Before setting the value, a check is made on the type constraint of |
936 | the attribute, if it has one, to see if the value passes it. If the |
cec39889 |
937 | value fails to pass, the set operation dies with a L</throw_error>. |
bcbaa845 |
938 | |
939 | Any coercion to convert values is done before checking the type constraint. |
940 | |
941 | To check a value against a type constraint before setting it, fetch the |
ec00fa75 |
942 | attribute instance using L<Class::MOP::Class/find_attribute_by_name>, |
bcbaa845 |
943 | fetch the type_constraint from the attribute using L<Moose::Meta::Attribute/type_constraint> |
e606ae5f |
944 | and call L<Moose::Meta::TypeConstraint/check>. See L<Moose::Cookbook::Basics::Recipe4> |
bcbaa845 |
945 | for an example. |
946 | |
a15dff8d |
947 | =back |
948 | |
93a708fd |
949 | =head2 Attribute Accessor generation |
6ba6d68c |
950 | |
a15dff8d |
951 | =over 4 |
952 | |
93a708fd |
953 | =item B<< $attr->install_accessors >> |
be05faea |
954 | |
93a708fd |
955 | This method overrides the parent to also install delegation methods. |
be05faea |
956 | |
7a582117 |
957 | If, after installing all methods, the attribute object has no associated |
958 | methods, it throws an error unless C<< is => 'bare' >> was passed to the |
959 | attribute constructor. (Trying to add an attribute that has no associated |
960 | methods is almost always an error.) |
961 | |
36741534 |
962 | =item B<< $attr->remove_accessors >> |
d5c30e52 |
963 | |
93a708fd |
964 | This method overrides the parent to also remove delegation methods. |
d5c30e52 |
965 | |
93a708fd |
966 | =item B<< $attr->install_delegation >> |
967 | |
968 | This method adds its delegation methods to the attribute's associated |
969 | class, if it has any to add. |
970 | |
971 | =item B<< $attr->remove_delegation >> |
972 | |
973 | This method remove its delegation methods from the attribute's |
974 | associated class. |
d5c30e52 |
975 | |
93a708fd |
976 | =item B<< $attr->accessor_metaclass >> |
9e93dd19 |
977 | |
93a708fd |
978 | Returns the accessor metaclass name, which defaults to |
979 | L<Moose::Meta::Method::Accessor>. |
980 | |
981 | =item B<< $attr->delegation_metaclass >> |
982 | |
983 | Returns the delegation metaclass name, which defaults to |
984 | L<Moose::Meta::Method::Delegation>. |
985 | |
986 | =back |
987 | |
988 | =head2 Additional Moose features |
989 | |
990 | These methods are not found in the superclass. They support features |
991 | provided by Moose. |
992 | |
36741534 |
993 | =over 4 |
994 | |
93a708fd |
995 | =item B<< $attr->does($role) >> |
996 | |
997 | This indicates whether the I<attribute itself> does the given |
36741534 |
998 | role. The role can be given as a full class name, or as a resolvable |
93a708fd |
999 | trait name. |
1000 | |
1001 | Note that this checks the attribute itself, not its type constraint, |
1002 | so it is checking the attribute's metaclass and any traits applied to |
1003 | the attribute. |
1004 | |
1005 | =item B<< Moose::Meta::Class->interpolate_class_and_new($name, %options) >> |
1006 | |
1007 | This is an alternate constructor that handles the C<metaclass> and |
1008 | C<traits> options. |
9e93dd19 |
1009 | |
93a708fd |
1010 | Effectively, this method is a factory that finds or creates the |
36741534 |
1011 | appropriate class for the given C<metaclass> and/or C<traits>. |
e606ae5f |
1012 | |
93a708fd |
1013 | Once it has the appropriate class, it will call C<< $class->new($name, |
1014 | %options) >> on that class. |
e606ae5f |
1015 | |
93a708fd |
1016 | =item B<< $attr->clone_and_inherit_options(%options) >> |
a15dff8d |
1017 | |
93a708fd |
1018 | This method supports the C<has '+foo'> feature. It does various bits |
1019 | of processing on the supplied C<%options> before ultimately calling |
1020 | the C<clone> method. |
6ba6d68c |
1021 | |
93a708fd |
1022 | One of its main tasks is to make sure that the C<%options> provided |
7782e1da |
1023 | does not include the options returned by the |
1024 | C<illegal_options_for_inheritance> method. |
a15dff8d |
1025 | |
7782e1da |
1026 | =item B<< $attr->illegal_options_for_inheritance >> |
a15dff8d |
1027 | |
7782e1da |
1028 | This returns a blacklist of options that can not be overridden in a |
93a708fd |
1029 | subclass's attribute definition. |
2b86e02b |
1030 | |
93a708fd |
1031 | This exists to allow a custom metaclass to change or add to the list |
7782e1da |
1032 | of options which can not be changed. |
2b86e02b |
1033 | |
93a708fd |
1034 | =item B<< $attr->type_constraint >> |
452bac1b |
1035 | |
93a708fd |
1036 | Returns the L<Moose::Meta::TypeConstraint> object for this attribute, |
1037 | if it has one. |
452bac1b |
1038 | |
93a708fd |
1039 | =item B<< $attr->has_type_constraint >> |
452bac1b |
1040 | |
93a708fd |
1041 | Returns true if this attribute has a type constraint. |
452bac1b |
1042 | |
93a708fd |
1043 | =item B<< $attr->verify_against_type_constraint($value) >> |
a15dff8d |
1044 | |
93a708fd |
1045 | Given a value, this method returns true if the value is valid for the |
1046 | attribute's type constraint. If the value is not valid, it throws an |
1047 | error. |
4b598ea3 |
1048 | |
93a708fd |
1049 | =item B<< $attr->handles >> |
ca01a97b |
1050 | |
93a708fd |
1051 | This returns the value of the C<handles> option passed to the |
1052 | constructor. |
ca01a97b |
1053 | |
93a708fd |
1054 | =item B<< $attr->has_handles >> |
ca01a97b |
1055 | |
93a708fd |
1056 | Returns true if this attribute performs delegation. |
ca01a97b |
1057 | |
93a708fd |
1058 | =item B<< $attr->is_weak_ref >> |
26fbace8 |
1059 | |
93a708fd |
1060 | Returns true if this attribute stores its value as a weak reference. |
26fbace8 |
1061 | |
93a708fd |
1062 | =item B<< $attr->is_required >> |
26fbace8 |
1063 | |
93a708fd |
1064 | Returns true if this attribute is required to have a value. |
26fbace8 |
1065 | |
93a708fd |
1066 | =item B<< $attr->is_lazy >> |
58f85113 |
1067 | |
93a708fd |
1068 | Returns true if this attribute is lazy. |
26fbace8 |
1069 | |
93a708fd |
1070 | =item B<< $attr->is_lazy_build >> |
ca01a97b |
1071 | |
93a708fd |
1072 | Returns true if the C<lazy_build> option was true when passed to the |
1073 | constructor. |
4b598ea3 |
1074 | |
93a708fd |
1075 | =item B<< $attr->should_coerce >> |
6ba6d68c |
1076 | |
93a708fd |
1077 | Returns true if the C<coerce> option passed to the constructor was |
1078 | true. |
536f0b17 |
1079 | |
93a708fd |
1080 | =item B<< $attr->should_auto_deref >> |
536f0b17 |
1081 | |
93a708fd |
1082 | Returns true if the C<auto_deref> option passed to the constructor was |
1083 | true. |
536f0b17 |
1084 | |
93a708fd |
1085 | =item B<< $attr->trigger >> |
8c9d74e7 |
1086 | |
93a708fd |
1087 | This is the subroutine reference that was in the C<trigger> option |
1088 | passed to the constructor, if any. |
02a0fb52 |
1089 | |
36741534 |
1090 | =item B<< $attr->has_trigger >> |
8c9d74e7 |
1091 | |
93a708fd |
1092 | Returns true if this attribute has a trigger set. |
02a0fb52 |
1093 | |
93a708fd |
1094 | =item B<< $attr->documentation >> |
ddbdc0cb |
1095 | |
93a708fd |
1096 | Returns the value that was in the C<documentation> option passed to |
1097 | the constructor, if any. |
ddbdc0cb |
1098 | |
93a708fd |
1099 | =item B<< $attr->has_documentation >> |
ddbdc0cb |
1100 | |
93a708fd |
1101 | Returns true if this attribute has any documentation. |
ddbdc0cb |
1102 | |
93a708fd |
1103 | =item B<< $attr->applied_traits >> |
88f23977 |
1104 | |
93a708fd |
1105 | This returns an array reference of all the traits which were applied |
1106 | to this attribute. If none were applied, this returns C<undef>. |
88f23977 |
1107 | |
93a708fd |
1108 | =item B<< $attr->has_applied_traits >> |
88f23977 |
1109 | |
93a708fd |
1110 | Returns true if this attribute has any traits applied. |
88f23977 |
1111 | |
c0e30cf5 |
1112 | =back |
1113 | |
1114 | =head1 BUGS |
1115 | |
d4048ef3 |
1116 | See L<Moose/BUGS> for details on reporting bugs. |
c0e30cf5 |
1117 | |
c0e30cf5 |
1118 | =head1 AUTHOR |
1119 | |
1120 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
1121 | |
98aae381 |
1122 | Yuval Kogman E<lt>nothingmuch@woobling.comE<gt> |
1123 | |
c0e30cf5 |
1124 | =head1 COPYRIGHT AND LICENSE |
1125 | |
7e0492d3 |
1126 | Copyright 2006-2010 by Infinity Interactive, Inc. |
c0e30cf5 |
1127 | |
1128 | L<http://www.iinteractive.com> |
1129 | |
1130 | This library is free software; you can redistribute it and/or modify |
26fbace8 |
1131 | it under the same terms as Perl itself. |
c0e30cf5 |
1132 | |
8a7a9c53 |
1133 | =cut |