Commit | Line | Data |
e2cf647c |
1 | package SQL::Translator::Schema::Trigger; |
2 | |
44659089 |
3 | # ---------------------------------------------------------------------- |
4 | # Copyright (C) 2002-2009 SQLFairy Authors |
5 | # |
6 | # This program is free software; you can redistribute it and/or |
7 | # modify it under the terms of the GNU General Public License as |
8 | # published by the Free Software Foundation; version 2. |
9 | # |
10 | # This program is distributed in the hope that it will be useful, but |
11 | # WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | # General Public License for more details. |
14 | # |
15 | # You should have received a copy of the GNU General Public License |
16 | # along with this program; if not, write to the Free Software |
17 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
18 | # 02111-1307 USA |
19 | # ------------------------------------------------------------------- |
20 | |
e2cf647c |
21 | =pod |
22 | |
23 | =head1 NAME |
24 | |
25 | SQL::Translator::Schema::Trigger - SQL::Translator trigger object |
26 | |
27 | =head1 SYNOPSIS |
28 | |
29 | use SQL::Translator::Schema::Trigger; |
30 | my $trigger = SQL::Translator::Schema::Trigger->new( |
4348b2b4 |
31 | name => 'foo', |
32 | perform_action_when => 'before', # or after |
33 | database_events => [qw/update insert/], # also update, update_on, delete |
34 | fields => [], # if event is "update" |
35 | on_table => 'foo', # table name |
36 | action => '...', # text of trigger |
37 | schema => $schema, # Schema object |
e2cf647c |
38 | ); |
39 | |
40 | =head1 DESCRIPTION |
41 | |
42 | C<SQL::Translator::Schema::Trigger> is the trigger object. |
43 | |
44 | =head1 METHODS |
45 | |
46 | =cut |
47 | |
48 | use strict; |
e2cf647c |
49 | use SQL::Translator::Utils 'parse_list_arg'; |
50 | |
b6a880d1 |
51 | use base 'SQL::Translator::Schema::Object'; |
52 | |
d0fcb05d |
53 | use Carp; |
54 | |
da06ac74 |
55 | use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT); |
56 | |
11ad2df9 |
57 | $VERSION = '1.59'; |
e2cf647c |
58 | |
9371be50 |
59 | __PACKAGE__->_attributes( qw/ |
ea93df61 |
60 | name schema perform_action_when database_events database_event |
4348b2b4 |
61 | fields table on_table action order |
9371be50 |
62 | /); |
e2cf647c |
63 | |
64 | =pod |
65 | |
66 | =head2 new |
67 | |
68 | Object constructor. |
69 | |
70 | my $schema = SQL::Translator::Schema::Trigger->new; |
71 | |
72 | =cut |
73 | |
e2cf647c |
74 | sub perform_action_when { |
75 | |
76 | =pod |
77 | |
78 | =head2 perform_action_when |
79 | |
ea93df61 |
80 | Gets or sets whether the event happens "before" or "after" the |
e2cf647c |
81 | C<database_event>. |
82 | |
83 | $trigger->perform_action_when('after'); |
84 | |
85 | =cut |
86 | |
87 | my $self = shift; |
ea93df61 |
88 | |
e2cf647c |
89 | if ( my $arg = shift ) { |
90 | $arg = lc $arg; |
91 | $arg =~ s/\s+/ /g; |
92 | if ( $arg =~ m/^(before|after)$/i ) { |
93 | $self->{'perform_action_when'} = $arg; |
94 | } |
95 | else { |
ea93df61 |
96 | return |
e2cf647c |
97 | $self->error("Invalid argument '$arg' to perform_action_when"); |
98 | } |
99 | } |
100 | |
101 | return $self->{'perform_action_when'}; |
102 | } |
103 | |
e2cf647c |
104 | sub database_event { |
105 | |
106 | =pod |
107 | |
108 | =head2 database_event |
109 | |
4348b2b4 |
110 | Obsolete please use database_events! |
e2cf647c |
111 | |
112 | =cut |
ea93df61 |
113 | |
4348b2b4 |
114 | my $self = shift; |
115 | |
116 | return $self->database_events( @_ ); |
8742e408 |
117 | } |
ea93df61 |
118 | |
8742e408 |
119 | sub database_events { |
e2cf647c |
120 | |
8742e408 |
121 | =pod |
e2cf647c |
122 | |
8742e408 |
123 | =head2 database_events |
e2cf647c |
124 | |
8742e408 |
125 | Gets or sets the events that triggers the trigger. |
126 | |
d0fcb05d |
127 | my $ok = $trigger->database_events('insert'); |
8742e408 |
128 | |
129 | =cut |
130 | |
4348b2b4 |
131 | my $self = shift; |
132 | my @args = ref $_[0] eq 'ARRAY' ? @{ $_[0] } : @_; |
133 | |
134 | if ( @args ) { |
135 | @args = map { s/\s+/ /g; lc $_ } @args; |
136 | my %valid = map { $_, 1 } qw[ insert update update_on delete ]; |
137 | my @invalid = grep { !defined $valid{ $_ } } @args; |
ea93df61 |
138 | |
4348b2b4 |
139 | if ( @invalid ) { |
140 | return $self->error( |
141 | sprintf("Invalid events '%s' in database_events", |
142 | join(', ', @invalid) |
143 | ) |
144 | ); |
145 | } |
146 | |
147 | $self->{'database_events'} = [ @args ]; |
148 | } |
149 | |
ea93df61 |
150 | return wantarray |
4348b2b4 |
151 | ? @{ $self->{'database_events'} || [] } |
152 | : $self->{'database_events'}; |
e2cf647c |
153 | } |
154 | |
e2cf647c |
155 | sub fields { |
156 | |
157 | =pod |
158 | |
159 | =head2 fields |
160 | |
161 | Gets and set which fields to monitor for C<database_event>. |
162 | |
163 | $view->fields('id'); |
164 | $view->fields('id', 'name'); |
165 | $view->fields( 'id, name' ); |
166 | $view->fields( [ 'id', 'name' ] ); |
167 | $view->fields( qw[ id name ] ); |
168 | |
169 | my @fields = $view->fields; |
170 | |
171 | =cut |
172 | |
173 | my $self = shift; |
174 | my $fields = parse_list_arg( @_ ); |
175 | |
176 | if ( @$fields ) { |
177 | my ( %unique, @unique ); |
178 | for my $f ( @$fields ) { |
179 | next if $unique{ $f }; |
180 | $unique{ $f } = 1; |
181 | push @unique, $f; |
182 | } |
183 | |
184 | $self->{'fields'} = \@unique; |
185 | } |
186 | |
187 | return wantarray ? @{ $self->{'fields'} || [] } : $self->{'fields'}; |
188 | } |
189 | |
8ce5d615 |
190 | sub table { |
191 | |
192 | =pod |
193 | |
194 | =head2 table |
195 | |
196 | Gets or set the table on which the trigger works, as a L<SQL::Translator::Schema::Table> object. |
197 | $trigger->table($triggered_table); |
198 | |
199 | =cut |
200 | |
201 | my ($self, $arg) = @_; |
202 | if ( @_ == 2 ) { |
203 | $self->error("Table attribute of a ".__PACKAGE__. |
ea93df61 |
204 | " must be a SQL::Translator::Schema::Table") |
8ce5d615 |
205 | unless ref $arg and $arg->isa('SQL::Translator::Schema::Table'); |
206 | $self->{table} = $arg; |
207 | } |
208 | return $self->{table}; |
209 | } |
210 | |
e2cf647c |
211 | sub on_table { |
212 | |
213 | =pod |
214 | |
215 | =head2 on_table |
216 | |
8ce5d615 |
217 | Gets or set the table name on which the trigger works, as a string. |
218 | $trigger->on_table('foo'); |
e2cf647c |
219 | |
220 | =cut |
221 | |
8ce5d615 |
222 | my ($self, $arg) = @_; |
223 | if ( @_ == 2 ) { |
224 | my $table = $self->schema->get_table($arg); |
225 | die "Table named $arg doesn't exist" |
226 | if !$table; |
227 | $self->table($table); |
228 | } |
229 | return $self->table->name; |
e2cf647c |
230 | } |
231 | |
e2cf647c |
232 | sub action { |
233 | |
234 | =pod |
235 | |
236 | =head2 action |
237 | |
cb490ce5 |
238 | Gets or set the action of the trigger. |
e2cf647c |
239 | |
cb490ce5 |
240 | $trigger->action( |
e2cf647c |
241 | q[ |
242 | BEGIN |
243 | select ...; |
244 | update ...; |
245 | END |
246 | ] |
247 | ); |
248 | |
249 | =cut |
250 | |
251 | my $self = shift; |
252 | my $arg = shift || ''; |
253 | $self->{'action'} = $arg if $arg; |
254 | return $self->{'action'}; |
255 | } |
256 | |
e2cf647c |
257 | sub is_valid { |
258 | |
259 | =pod |
260 | |
261 | =head2 is_valid |
262 | |
263 | Determine whether the trigger is valid or not. |
264 | |
265 | my $ok = $trigger->is_valid; |
266 | |
267 | =cut |
268 | |
269 | my $self = shift; |
270 | |
ea93df61 |
271 | for my $attr ( |
272 | qw[ name perform_action_when database_events on_table action ] |
e2cf647c |
273 | ) { |
4348b2b4 |
274 | return $self->error("Invalid: missing '$attr'") unless $self->$attr(); |
e2cf647c |
275 | } |
ea93df61 |
276 | |
277 | return $self->error("Missing fields for UPDATE ON") if |
e2cf647c |
278 | $self->database_event eq 'update_on' && !$self->fields; |
279 | |
280 | return 1; |
281 | } |
282 | |
e2cf647c |
283 | sub name { |
284 | |
285 | =pod |
286 | |
287 | =head2 name |
288 | |
289 | Get or set the trigger's name. |
290 | |
291 | my $name = $trigger->name('foo'); |
292 | |
293 | =cut |
294 | |
295 | my $self = shift; |
296 | $self->{'name'} = shift if @_; |
297 | return $self->{'name'} || ''; |
298 | } |
299 | |
e2cf647c |
300 | sub order { |
301 | |
302 | =pod |
303 | |
304 | =head2 order |
305 | |
306 | Get or set the trigger's order. |
307 | |
308 | my $order = $trigger->order(3); |
309 | |
310 | =cut |
311 | |
312 | my ( $self, $arg ) = @_; |
313 | |
314 | if ( defined $arg && $arg =~ /^\d+$/ ) { |
315 | $self->{'order'} = $arg; |
316 | } |
317 | |
318 | return $self->{'order'} || 0; |
319 | } |
320 | |
39ad1787 |
321 | sub schema { |
322 | |
323 | =pod |
324 | |
325 | =head2 schema |
326 | |
327 | Get or set the trigger's schema object. |
328 | |
329 | $trigger->schema( $schema ); |
330 | my $schema = $trigger->schema; |
331 | |
332 | =cut |
333 | |
334 | my $self = shift; |
335 | if ( my $arg = shift ) { |
336 | return $self->error('Not a schema object') unless |
337 | UNIVERSAL::isa( $arg, 'SQL::Translator::Schema' ); |
338 | $self->{'schema'} = $arg; |
339 | } |
340 | |
341 | return $self->{'schema'}; |
342 | } |
343 | |
8742e408 |
344 | sub compare_arrays { |
345 | |
346 | =pod |
347 | |
348 | =head2 compare_arrays |
349 | |
350 | Compare two arrays. |
351 | |
352 | =cut |
ea93df61 |
353 | |
4348b2b4 |
354 | my ($first, $second) = @_; |
355 | no warnings; # silence spurious -w undef complaints |
356 | |
357 | return 0 unless (ref $first eq 'ARRAY' and ref $second eq 'ARRAY' ) ; |
358 | |
359 | return 0 unless @$first == @$second; |
360 | |
361 | my @first = sort @$first; |
362 | |
363 | my @second = sort @$second; |
364 | |
365 | for (my $i = 0; $i < scalar @first; $i++) { |
366 | return 0 if @first[$i] ne @second[$i]; |
367 | } |
368 | |
369 | return 1; |
8742e408 |
370 | } |
371 | |
abf315bb |
372 | sub equals { |
373 | |
374 | =pod |
375 | |
376 | =head2 equals |
377 | |
378 | Determines if this trigger is the same as another |
379 | |
4348b2b4 |
380 | my $is_identical = $trigger1->equals( $trigger2 ); |
abf315bb |
381 | |
382 | =cut |
383 | |
4348b2b4 |
384 | my $self = shift; |
385 | my $other = shift; |
6be9534b |
386 | my $case_insensitive = shift; |
ea93df61 |
387 | |
abf315bb |
388 | return 0 unless $self->SUPER::equals($other); |
4348b2b4 |
389 | |
7f275a61 |
390 | my %names; |
ea93df61 |
391 | for my $name ( $self->name, $other->name ) { |
7f275a61 |
392 | $name = lc $name if $case_insensitive; |
393 | $names{ $name }++; |
394 | } |
4348b2b4 |
395 | |
7f275a61 |
396 | if ( keys %names > 1 ) { |
397 | return $self->error('Names not equal'); |
398 | } |
4348b2b4 |
399 | |
7f275a61 |
400 | if ( !$self->perform_action_when eq $other->perform_action_when ) { |
401 | return $self->error('perform_action_when differs'); |
402 | } |
403 | |
ea93df61 |
404 | if ( |
405 | !compare_arrays( [$self->database_events], [$other->database_events] ) |
7f275a61 |
406 | ) { |
407 | return $self->error('database_events differ'); |
408 | } |
4348b2b4 |
409 | |
7f275a61 |
410 | if ( $self->on_table ne $other->on_table ) { |
411 | return $self->error('on_table differs'); |
412 | } |
4348b2b4 |
413 | |
7f275a61 |
414 | if ( $self->action ne $other->action ) { |
415 | return $self->error('action differs'); |
416 | } |
4348b2b4 |
417 | |
ea93df61 |
418 | if ( |
7f275a61 |
419 | !$self->_compare_objects( scalar $self->extra, scalar $other->extra ) |
420 | ) { |
421 | return $self->error('extras differ'); |
422 | } |
4348b2b4 |
423 | |
abf315bb |
424 | return 1; |
425 | } |
426 | |
39ad1787 |
427 | sub DESTROY { |
428 | my $self = shift; |
429 | undef $self->{'schema'}; # destroy cyclical reference |
430 | } |
431 | |
e2cf647c |
432 | 1; |
433 | |
e2cf647c |
434 | =pod |
435 | |
4348b2b4 |
436 | =head1 AUTHORS |
e2cf647c |
437 | |
4348b2b4 |
438 | Anonymous, |
439 | Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>. |
e2cf647c |
440 | |
441 | =cut |