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1 | package SQL::Translator::Schema::Index; |
2 | |
3 | # ---------------------------------------------------------------------- |
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4 | # Copyright (C) 2002-2009 SQLFairy Authors |
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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 | |
21 | =pod |
22 | |
23 | =head1 NAME |
24 | |
25 | SQL::Translator::Schema::Index - SQL::Translator index object |
26 | |
27 | =head1 SYNOPSIS |
28 | |
29 | use SQL::Translator::Schema::Index; |
30 | my $index = SQL::Translator::Schema::Index->new( |
31 | name => 'foo', |
32 | fields => [ id ], |
33 | type => 'unique', |
34 | ); |
35 | |
36 | =head1 DESCRIPTION |
37 | |
38 | C<SQL::Translator::Schema::Index> is the index object. |
39 | |
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40 | Primary and unique keys are table constraints, not indices. |
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41 | |
42 | =head1 METHODS |
43 | |
44 | =cut |
45 | |
46 | use strict; |
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47 | use SQL::Translator::Schema::Constants; |
48 | use SQL::Translator::Utils 'parse_list_arg'; |
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49 | |
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50 | use base 'SQL::Translator::Schema::Object'; |
51 | |
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52 | use vars qw($VERSION $TABLE_COUNT $VIEW_COUNT); |
53 | |
54 | $VERSION = '1.99'; |
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55 | |
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56 | my %VALID_INDEX_TYPE = ( |
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57 | UNIQUE => 1, |
58 | NORMAL => 1, |
59 | FULL_TEXT => 1, # MySQL only (?) |
60 | SPATIAL => 1, # MySQL only (?) |
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61 | ); |
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62 | |
63 | # ---------------------------------------------------------------------- |
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64 | |
65 | __PACKAGE__->_attributes( qw/ |
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66 | name type fields table options |
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67 | /); |
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68 | |
69 | =pod |
70 | |
71 | =head2 new |
72 | |
73 | Object constructor. |
74 | |
75 | my $schema = SQL::Translator::Schema::Index->new; |
76 | |
77 | =cut |
78 | |
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79 | # ---------------------------------------------------------------------- |
80 | sub fields { |
81 | |
82 | =pod |
83 | |
84 | =head2 fields |
85 | |
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86 | Gets and set the fields the index is on. Accepts a string, list or |
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87 | arrayref; returns an array or array reference. Will unique the field |
88 | names and keep them in order by the first occurrence of a field name. |
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89 | |
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90 | $index->fields('id'); |
91 | $index->fields('id', 'name'); |
92 | $index->fields( 'id, name' ); |
93 | $index->fields( [ 'id', 'name' ] ); |
94 | $index->fields( qw[ id name ] ); |
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95 | |
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96 | my @fields = $index->fields; |
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97 | |
98 | =cut |
99 | |
100 | my $self = shift; |
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101 | my $fields = parse_list_arg( @_ ); |
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102 | |
103 | if ( @$fields ) { |
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104 | my ( %unique, @unique ); |
105 | for my $f ( @$fields ) { |
106 | next if $unique{ $f }; |
107 | $unique{ $f } = 1; |
108 | push @unique, $f; |
109 | } |
110 | |
111 | $self->{'fields'} = \@unique; |
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112 | } |
113 | |
114 | return wantarray ? @{ $self->{'fields'} || [] } : $self->{'fields'}; |
115 | } |
116 | |
117 | # ---------------------------------------------------------------------- |
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118 | sub is_valid { |
119 | |
120 | =pod |
121 | |
122 | =head2 is_valid |
123 | |
124 | Determine whether the index is valid or not. |
125 | |
126 | my $ok = $index->is_valid; |
127 | |
128 | =cut |
129 | |
130 | my $self = shift; |
131 | my $table = $self->table or return $self->error('No table'); |
132 | my @fields = $self->fields or return $self->error('No fields'); |
133 | |
134 | for my $field ( @fields ) { |
135 | return $self->error( |
136 | "Field '$field' does not exist in table '", $table->name, "'" |
137 | ) unless $table->get_field( $field ); |
138 | } |
139 | |
140 | return 1; |
141 | } |
142 | |
143 | # ---------------------------------------------------------------------- |
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144 | sub name { |
145 | |
146 | =pod |
147 | |
148 | =head2 name |
149 | |
150 | Get or set the index's name. |
151 | |
152 | my $name = $index->name('foo'); |
153 | |
154 | =cut |
155 | |
156 | my $self = shift; |
157 | $self->{'name'} = shift if @_; |
158 | return $self->{'name'} || ''; |
159 | } |
160 | |
161 | # ---------------------------------------------------------------------- |
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162 | sub options { |
163 | |
164 | =pod |
165 | |
166 | =head2 options |
167 | |
168 | Get or set the index's options (e.g., "using" or "where" for PG). Returns |
169 | an array or array reference. |
170 | |
171 | my @options = $index->options; |
172 | |
173 | =cut |
174 | |
175 | my $self = shift; |
176 | my $options = parse_list_arg( @_ ); |
177 | |
178 | push @{ $self->{'options'} }, @$options; |
179 | |
180 | if ( ref $self->{'options'} ) { |
181 | return wantarray ? @{ $self->{'options'} || [] } : $self->{'options'}; |
182 | } |
183 | else { |
184 | return wantarray ? () : []; |
185 | } |
186 | } |
187 | |
188 | # ---------------------------------------------------------------------- |
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189 | sub table { |
190 | |
191 | =pod |
192 | |
193 | =head2 table |
194 | |
195 | Get or set the index's table object. |
196 | |
197 | my $table = $index->table; |
198 | |
199 | =cut |
200 | |
201 | my $self = shift; |
202 | if ( my $arg = shift ) { |
203 | return $self->error('Not a table object') unless |
204 | UNIVERSAL::isa( $arg, 'SQL::Translator::Schema::Table' ); |
205 | $self->{'table'} = $arg; |
206 | } |
207 | |
208 | return $self->{'table'}; |
209 | } |
210 | |
211 | # ---------------------------------------------------------------------- |
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212 | sub type { |
213 | |
214 | =pod |
215 | |
216 | =head2 type |
217 | |
218 | Get or set the index's type. |
219 | |
220 | my $type = $index->type('unique'); |
221 | |
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222 | Get or set the index's options (e.g., "using" or "where" for PG). Returns |
223 | |
224 | Currently there are only four acceptable types: UNIQUE, NORMAL, FULL_TEXT, |
225 | and SPATIAL. The latter two might be MySQL-specific. While both lowercase |
226 | and uppercase types are acceptable input, this method returns the type in |
227 | uppercase. |
228 | |
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229 | =cut |
230 | |
231 | my $self = shift; |
232 | |
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233 | if ( my $type = uc shift ) { |
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234 | return $self->error("Invalid index type: $type") |
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235 | unless $VALID_INDEX_TYPE{ $type }; |
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236 | $self->{'type'} = $type; |
237 | } |
238 | |
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239 | return $self->{'type'} || 'NORMAL'; |
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240 | } |
241 | |
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242 | # ---------------------------------------------------------------------- |
243 | sub equals { |
244 | |
245 | =pod |
246 | |
247 | =head2 equals |
248 | |
249 | Determines if this index is the same as another |
250 | |
251 | my $isIdentical = $index1->equals( $index2 ); |
252 | |
253 | =cut |
254 | |
255 | my $self = shift; |
256 | my $other = shift; |
257 | my $case_insensitive = shift; |
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258 | my $ignore_index_names = shift; |
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259 | |
260 | return 0 unless $self->SUPER::equals($other); |
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261 | |
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262 | unless ($ignore_index_names) { |
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263 | unless ((!$self->name && ($other->name eq $other->fields->[0])) || |
264 | (!$other->name && ($self->name eq $self->fields->[0]))) { |
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265 | return 0 unless $case_insensitive ? uc($self->name) eq uc($other->name) : $self->name eq $other->name; |
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266 | } |
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267 | } |
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268 | #return 0 unless $self->is_valid eq $other->is_valid; |
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269 | return 0 unless $self->type eq $other->type; |
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270 | |
271 | # Check fields, regardless of order |
272 | my %otherFields = (); # create a hash of the other fields |
273 | foreach my $otherField ($other->fields) { |
274 | $otherField = uc($otherField) if $case_insensitive; |
275 | $otherFields{$otherField} = 1; |
276 | } |
277 | foreach my $selfField ($self->fields) { # check for self fields in hash |
278 | $selfField = uc($selfField) if $case_insensitive; |
279 | return 0 unless $otherFields{$selfField}; |
280 | delete $otherFields{$selfField}; |
281 | } |
282 | # Check all other fields were accounted for |
283 | return 0 unless keys %otherFields == 0; |
284 | |
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285 | return 0 unless $self->_compare_objects(scalar $self->options, scalar $other->options); |
286 | return 0 unless $self->_compare_objects(scalar $self->extra, scalar $other->extra); |
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287 | return 1; |
288 | } |
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289 | |
290 | # ---------------------------------------------------------------------- |
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291 | sub DESTROY { |
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292 | my $self = shift; |
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293 | undef $self->{'table'}; # destroy cyclical reference |
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294 | } |
295 | |
296 | 1; |
297 | |
298 | # ---------------------------------------------------------------------- |
299 | |
300 | =pod |
301 | |
302 | =head1 AUTHOR |
303 | |
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304 | Ken Y. Clark E<lt>kclark@cpan.orgE<gt>. |
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305 | |
306 | =cut |