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963a69a5 |
1 | package Class::Accessor::Grouped; |
2 | use strict; |
3 | use warnings; |
a0bce8bc |
4 | use Carp (); |
331e820d |
5 | use Class::Inspector (); |
a0bce8bc |
6 | use Scalar::Util (); |
8787799c |
7 | use MRO::Compat; |
1ee74bdd |
8 | use Sub::Name (); |
331e820d |
9 | |
af169484 |
10 | our $VERSION = '0.09003'; |
15cf8e32 |
11 | $VERSION = eval $VERSION; |
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12 | |
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13 | our $hasXS; |
af169484 |
14 | |
a2537c55 |
15 | sub _hasXS { |
a2537c55 |
16 | if (not defined $hasXS) { |
17 | $hasXS = 0; |
18 | |
8ef9b3ff |
19 | eval { |
20 | require Class::XSAccessor; |
21 | $hasXS = 1; |
22 | }; |
a2537c55 |
23 | } |
24 | |
25 | return $hasXS; |
26 | } |
27 | |
963a69a5 |
28 | =head1 NAME |
29 | |
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30 | Class::Accessor::Grouped - Lets you build groups of accessors |
963a69a5 |
31 | |
32 | =head1 SYNOPSIS |
33 | |
34 | =head1 DESCRIPTION |
35 | |
36 | This class lets you build groups of accessors that will call different |
37 | getters and setters. |
38 | |
39 | =head1 METHODS |
40 | |
41 | =head2 mk_group_accessors |
42 | |
43 | =over 4 |
44 | |
45 | =item Arguments: $group, @fieldspec |
46 | |
47 | Returns: none |
48 | |
49 | =back |
50 | |
51 | Creates a set of accessors in a given group. |
52 | |
53 | $group is the name of the accessor group for the generated accessors; they |
54 | will call get_$group($field) on get and set_$group($field, $value) on set. |
55 | |
22fa6720 |
56 | If you want to mimic Class::Accessor's mk_accessors $group has to be 'simple' |
57 | to tell Class::Accessor::Grouped to use its own get_simple and set_simple |
58 | methods. |
59 | |
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60 | @fieldspec is a list of field/accessor names; if a fieldspec is a scalar |
61 | this is used as both field and accessor name, if a listref it is expected to |
62 | be of the form [ $accessor, $field ]. |
63 | |
64 | =cut |
65 | |
66 | sub mk_group_accessors { |
67 | my ($self, $group, @fields) = @_; |
68 | |
69 | $self->_mk_group_accessors('make_group_accessor', $group, @fields); |
70 | return; |
71 | } |
72 | |
73 | |
74 | { |
75 | no strict 'refs'; |
76 | no warnings 'redefine'; |
77 | |
78 | sub _mk_group_accessors { |
79 | my($self, $maker, $group, @fields) = @_; |
a0bce8bc |
80 | my $class = Scalar::Util::blessed $self || $self; |
963a69a5 |
81 | |
82 | # So we don't have to do lots of lookups inside the loop. |
83 | $maker = $self->can($maker) unless ref $maker; |
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84 | |
85 | my $hasXS = _hasXS(); |
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86 | |
87 | foreach my $field (@fields) { |
88 | if( $field eq 'DESTROY' ) { |
a0bce8bc |
89 | Carp::carp("Having a data accessor named DESTROY in ". |
963a69a5 |
90 | "'$class' is unwise."); |
91 | } |
92 | |
93 | my $name = $field; |
94 | |
95 | ($name, $field) = @$field if ref $field; |
9540f4e4 |
96 | |
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97 | my $alias = "_${name}_accessor"; |
1ee74bdd |
98 | my $full_name = join('::', $class, $name); |
99 | my $full_alias = join('::', $class, $alias); |
9540f4e4 |
100 | if ( $hasXS && $group eq 'simple' ) { |
46f1ef81 |
101 | require Class::XSAccessor; |
96bd9337 |
102 | Class::XSAccessor->import({ |
103 | replace => 1, |
104 | class => $class, |
105 | accessors => { |
106 | $name => $field, |
107 | $alias => $field, |
108 | }, |
109 | }); |
9540f4e4 |
110 | } |
111 | else { |
112 | my $accessor = $self->$maker($group, $field); |
113 | my $alias_accessor = $self->$maker($group, $field); |
114 | |
115 | *$full_name = Sub::Name::subname($full_name, $accessor); |
116 | #unless defined &{$class."\:\:$field"} |
117 | |
118 | *$full_alias = Sub::Name::subname($full_alias, $alias_accessor); |
119 | #unless defined &{$class."\:\:$alias"} |
120 | } |
963a69a5 |
121 | } |
122 | } |
123 | } |
124 | |
125 | =head2 mk_group_ro_accessors |
126 | |
127 | =over 4 |
128 | |
129 | =item Arguments: $group, @fieldspec |
130 | |
131 | Returns: none |
132 | |
133 | =back |
134 | |
135 | Creates a set of read only accessors in a given group. Identical to |
a557f8ad |
136 | L</mk_group_accessors> but accessors will throw an error if passed a value |
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137 | rather than setting the value. |
138 | |
139 | =cut |
140 | |
141 | sub mk_group_ro_accessors { |
142 | my($self, $group, @fields) = @_; |
143 | |
144 | $self->_mk_group_accessors('make_group_ro_accessor', $group, @fields); |
145 | } |
146 | |
147 | =head2 mk_group_wo_accessors |
148 | |
149 | =over 4 |
150 | |
151 | =item Arguments: $group, @fieldspec |
152 | |
153 | Returns: none |
154 | |
155 | =back |
156 | |
157 | Creates a set of write only accessors in a given group. Identical to |
a557f8ad |
158 | L</mk_group_accessors> but accessors will throw an error if not passed a |
963a69a5 |
159 | value rather than getting the value. |
160 | |
161 | =cut |
162 | |
163 | sub mk_group_wo_accessors { |
164 | my($self, $group, @fields) = @_; |
165 | |
166 | $self->_mk_group_accessors('make_group_wo_accessor', $group, @fields); |
167 | } |
168 | |
169 | =head2 make_group_accessor |
170 | |
171 | =over 4 |
172 | |
173 | =item Arguments: $group, $field |
174 | |
175 | Returns: $sub (\CODE) |
176 | |
177 | =back |
178 | |
179 | Returns a single accessor in a given group; called by mk_group_accessors |
180 | for each entry in @fieldspec. |
181 | |
182 | =cut |
183 | |
184 | sub make_group_accessor { |
185 | my ($class, $group, $field) = @_; |
186 | |
187 | my $set = "set_$group"; |
188 | my $get = "get_$group"; |
189 | |
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190 | # eval for faster fastiness |
191 | return eval "sub { |
192 | if(\@_ > 1) { |
193 | return shift->$set('$field', \@_); |
963a69a5 |
194 | } |
195 | else { |
a0bce8bc |
196 | return shift->$get('$field'); |
963a69a5 |
197 | } |
a0bce8bc |
198 | };" |
963a69a5 |
199 | } |
200 | |
201 | =head2 make_group_ro_accessor |
202 | |
203 | =over 4 |
204 | |
205 | =item Arguments: $group, $field |
206 | |
207 | Returns: $sub (\CODE) |
208 | |
209 | =back |
210 | |
211 | Returns a single read-only accessor in a given group; called by |
212 | mk_group_ro_accessors for each entry in @fieldspec. |
213 | |
214 | =cut |
215 | |
216 | sub make_group_ro_accessor { |
217 | my($class, $group, $field) = @_; |
218 | |
219 | my $get = "get_$group"; |
220 | |
a0bce8bc |
221 | return eval "sub { |
222 | if(\@_ > 1) { |
223 | my \$caller = caller; |
224 | Carp::croak(\"'\$caller' cannot alter the value of '$field' on \". |
225 | \"objects of class '$class'\"); |
963a69a5 |
226 | } |
227 | else { |
a0bce8bc |
228 | return shift->$get('$field'); |
963a69a5 |
229 | } |
a0bce8bc |
230 | };" |
963a69a5 |
231 | } |
232 | |
233 | =head2 make_group_wo_accessor |
234 | |
235 | =over 4 |
236 | |
237 | =item Arguments: $group, $field |
238 | |
239 | Returns: $sub (\CODE) |
240 | |
241 | =back |
242 | |
243 | Returns a single write-only accessor in a given group; called by |
244 | mk_group_wo_accessors for each entry in @fieldspec. |
245 | |
246 | =cut |
247 | |
248 | sub make_group_wo_accessor { |
249 | my($class, $group, $field) = @_; |
250 | |
251 | my $set = "set_$group"; |
252 | |
a0bce8bc |
253 | return eval "sub { |
254 | unless (\@_ > 1) { |
255 | my \$caller = caller; |
256 | Carp::croak(\"'\$caller' cannot access the value of '$field' on \". |
257 | \"objects of class '$class'\"); |
963a69a5 |
258 | } |
259 | else { |
a0bce8bc |
260 | return shift->$set('$field', \@_); |
963a69a5 |
261 | } |
a0bce8bc |
262 | };" |
963a69a5 |
263 | } |
264 | |
265 | =head2 get_simple |
266 | |
267 | =over 4 |
268 | |
269 | =item Arguments: $field |
270 | |
271 | Returns: $value |
272 | |
273 | =back |
274 | |
275 | Simple getter for hash-based objects which returns the value for the field |
276 | name passed as an argument. |
277 | |
278 | =cut |
279 | |
280 | sub get_simple { |
a0bce8bc |
281 | return $_[0]->{$_[1]}; |
963a69a5 |
282 | } |
283 | |
284 | =head2 set_simple |
285 | |
286 | =over 4 |
287 | |
288 | =item Arguments: $field, $new_value |
289 | |
290 | Returns: $new_value |
291 | |
292 | =back |
293 | |
294 | Simple setter for hash-based objects which sets and then returns the value |
295 | for the field name passed as an argument. |
296 | |
297 | =cut |
298 | |
299 | sub set_simple { |
a0bce8bc |
300 | return $_[0]->{$_[1]} = $_[2]; |
963a69a5 |
301 | } |
302 | |
e6f2a0fd |
303 | |
304 | =head2 get_inherited |
305 | |
306 | =over 4 |
307 | |
308 | =item Arguments: $field |
309 | |
310 | Returns: $value |
311 | |
312 | =back |
313 | |
331e820d |
314 | Simple getter for Classes and hash-based objects which returns the value for |
315 | the field name passed as an argument. This behaves much like |
316 | L<Class::Data::Accessor> where the field can be set in a base class, |
317 | inherited and changed in subclasses, and inherited and changed for object |
318 | instances. |
e6f2a0fd |
319 | |
320 | =cut |
321 | |
322 | sub get_inherited { |
a49c32d9 |
323 | my $class; |
e6f2a0fd |
324 | |
62cf9924 |
325 | if ( ($class = ref $_[0]) && Scalar::Util::blessed $_[0]) { |
326 | if (Scalar::Util::reftype $_[0] eq 'HASH') { |
327 | return $_[0]->{$_[1]} if exists $_[0]->{$_[1]}; |
328 | } |
329 | else { |
330 | Carp::croak('Cannot get inherited value on an object instance that is not hash-based'); |
331 | } |
332 | } |
333 | else { |
a0bce8bc |
334 | $class = $_[0]; |
62cf9924 |
335 | } |
e6f2a0fd |
336 | |
337 | no strict 'refs'; |
fe63d727 |
338 | no warnings qw/uninitialized/; |
62cf9924 |
339 | |
340 | my $cag_slot = '::__cag_'. $_[1]; |
341 | return ${$class.$cag_slot} if defined(${$class.$cag_slot}); |
e6f2a0fd |
342 | |
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343 | # we need to be smarter about recalculation, as @ISA (thus supers) can very well change in-flight |
62cf9924 |
344 | my $cur_gen = mro::get_pkg_gen ($class); |
345 | if ( $cur_gen != ${$class.'::__cag_pkg_gen__'} ) { |
346 | @{$class.'::__cag_supers__'} = $_[0]->get_super_paths; |
347 | ${$class.'::__cag_pkg_gen__'} = $cur_gen; |
348 | } |
a49c32d9 |
349 | |
62cf9924 |
350 | for (@{$class.'::__cag_supers__'}) { |
351 | return ${$_.$cag_slot} if defined(${$_.$cag_slot}); |
e6f2a0fd |
352 | }; |
c46050d3 |
353 | |
9c3d5179 |
354 | return undef; |
e6f2a0fd |
355 | } |
356 | |
357 | =head2 set_inherited |
358 | |
359 | =over 4 |
360 | |
361 | =item Arguments: $field, $new_value |
362 | |
363 | Returns: $new_value |
364 | |
365 | =back |
366 | |
331e820d |
367 | Simple setter for Classes and hash-based objects which sets and then returns |
368 | the value for the field name passed as an argument. When called on a hash-based |
369 | object it will set the appropriate hash key value. When called on a class, it |
370 | will set a class level variable. |
e6f2a0fd |
371 | |
331e820d |
372 | B<Note:>: This method will die if you try to set an object variable on a non |
373 | hash-based object. |
e6f2a0fd |
374 | |
375 | =cut |
376 | |
377 | sub set_inherited { |
a0bce8bc |
378 | if (Scalar::Util::blessed $_[0]) { |
379 | if (Scalar::Util::reftype $_[0] eq 'HASH') { |
380 | return $_[0]->{$_[1]} = $_[2]; |
e6f2a0fd |
381 | } else { |
a0bce8bc |
382 | Carp::croak('Cannot set inherited value on an object instance that is not hash-based'); |
e6f2a0fd |
383 | }; |
384 | } else { |
385 | no strict 'refs'; |
386 | |
a0bce8bc |
387 | return ${$_[0].'::__cag_'.$_[1]} = $_[2]; |
e6f2a0fd |
388 | }; |
389 | } |
390 | |
331e820d |
391 | =head2 get_component_class |
392 | |
393 | =over 4 |
394 | |
395 | =item Arguments: $field |
396 | |
397 | Returns: $value |
398 | |
399 | =back |
400 | |
401 | Gets the value of the specified component class. |
402 | |
403 | __PACKAGE__->mk_group_accessors('component_class' => 'result_class'); |
97d76fb4 |
404 | |
331e820d |
405 | $self->result_class->method(); |
97d76fb4 |
406 | |
331e820d |
407 | ## same as |
408 | $self->get_component_class('result_class')->method(); |
409 | |
410 | =cut |
411 | |
412 | sub get_component_class { |
a0bce8bc |
413 | return $_[0]->get_inherited($_[1]); |
331e820d |
414 | }; |
415 | |
416 | =head2 set_component_class |
417 | |
418 | =over 4 |
419 | |
420 | =item Arguments: $field, $class |
421 | |
422 | Returns: $new_value |
423 | |
424 | =back |
425 | |
426 | Inherited accessor that automatically loads the specified class before setting |
427 | it. This method will die if the specified class could not be loaded. |
428 | |
429 | __PACKAGE__->mk_group_accessors('component_class' => 'result_class'); |
430 | __PACKAGE__->result_class('MyClass'); |
97d76fb4 |
431 | |
331e820d |
432 | $self->result_class->method(); |
433 | |
434 | =cut |
435 | |
436 | sub set_component_class { |
a0bce8bc |
437 | if ($_[2]) { |
bce7bdf8 |
438 | local $^W = 0; |
a0bce8bc |
439 | if (Class::Inspector->installed($_[2]) && !Class::Inspector->loaded($_[2])) { |
440 | eval "use $_[2]"; |
331e820d |
441 | |
a0bce8bc |
442 | Carp::croak("Could not load $_[1] '$_[2]': ", $@) if $@; |
331e820d |
443 | }; |
444 | }; |
445 | |
a0bce8bc |
446 | return $_[0]->set_inherited($_[1], $_[2]); |
331e820d |
447 | }; |
448 | |
a49c32d9 |
449 | =head2 get_super_paths |
450 | |
451 | Returns a list of 'parent' or 'super' class names that the current class inherited from. |
452 | |
453 | =cut |
454 | |
455 | sub get_super_paths { |
62cf9924 |
456 | return @{mro::get_linear_isa( ref($_[0]) || $_[0] )}; |
a49c32d9 |
457 | }; |
458 | |
a2537c55 |
459 | 1; |
b9a69571 |
460 | |
9d7d52da |
461 | =head1 PERFORMANCE |
15cf8e32 |
462 | |
a2537c55 |
463 | You can speed up accessors of type 'simple' by installing L<Class::XSAccessor>. |
963a69a5 |
464 | |
465 | =head1 AUTHORS |
466 | |
467 | Matt S. Trout <mst@shadowcatsystems.co.uk> |
97972dcb |
468 | Christopher H. Laco <claco@chrislaco.com> |
963a69a5 |
469 | |
8ef9b3ff |
470 | =head1 CONTRIBUTORS |
dfb86526 |
471 | |
8ef9b3ff |
472 | groditi: Guillermo Roditi <groditi@cpan.org> |
473 | ribasushi: Peter Rabbitson <ribasushi@cpan.org> |
dfb86526 |
474 | |
4fe25633 |
475 | =head1 COPYRIGHT & LICENSE |
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476 | |
af169484 |
477 | Copyright (c) 2006-2010 Matt S. Trout <mst@shadowcatsystems.co.uk> |
963a69a5 |
478 | |
4fe25633 |
479 | This program is free software; you can redistribute it and/or modify |
480 | it under the same terms as perl itself. |
963a69a5 |
481 | |
4fe25633 |
482 | =cut |