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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | |
21 | namespace MediaWiki\Page; |
22 | |
23 | use MediaWiki\DAO\WikiAwareEntityTrait; |
24 | use Stringable; |
25 | use Wikimedia\Assert\Assert; |
26 | use Wikimedia\NonSerializable\NonSerializableTrait; |
27 | |
28 | /** |
29 | * Immutable value object representing a page reference. |
30 | * |
31 | * Instances of this class are expected to always represent a viewable pages, that is, |
32 | * pages that can at least potentially be visited on the wiki. |
33 | * This class may represent Special pages, but not interwiki links, section links, etc. |
34 | * |
35 | * Code that deserializes instances of PageReferenceValue must ensure that the original |
36 | * meaning of the "local" Wiki ID is preserved: When an instance of PageReferenceValue |
37 | * is created with self::LOCAL as the Wiki ID on one wiki, gets serialized, |
38 | * stored, and later read and unserialized on another wiki, the value of the Wiki ID |
39 | * must be adjusted to refer to the original wiki. |
40 | * |
41 | * @since 1.37 |
42 | */ |
43 | class PageReferenceValue implements Stringable, PageReference { |
44 | |
45 | /* Use JSON, but beware the note on serialization above. */ |
46 | use NonSerializableTrait; |
47 | use WikiAwareEntityTrait; |
48 | |
49 | /** @var int */ |
50 | private $namespace; |
51 | |
52 | /** @var string */ |
53 | private $dbKey; |
54 | |
55 | /** @var string|false */ |
56 | private $wikiId; |
57 | |
58 | /** |
59 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
60 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
61 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
62 | * or self::LOCAL for the local wiki. |
63 | */ |
64 | public function __construct( int $namespace, string $dbKey, $wikiId ) { |
65 | $this->assertWikiIdParam( $wikiId ); |
66 | |
67 | Assert::parameter( $dbKey !== '', '$dbKey', 'must not be empty' ); |
68 | |
69 | // Replace spaces with underscores |
70 | $dbKey = str_replace( ' ', '_', $dbKey ); |
71 | |
72 | $this->wikiId = $wikiId; |
73 | $this->namespace = $namespace; |
74 | $this->dbKey = $dbKey; |
75 | } |
76 | |
77 | /** |
78 | * Create PageReference for a local page. |
79 | * |
80 | * @param int $namespace |
81 | * @param string $dbKey |
82 | * @return PageReferenceValue |
83 | */ |
84 | public static function localReference( int $namespace, string $dbKey ): self { |
85 | return new self( $namespace, $dbKey, self::LOCAL ); |
86 | } |
87 | |
88 | /** |
89 | * Get the ID of the wiki provided to the constructor. |
90 | * |
91 | * @return string|false |
92 | */ |
93 | public function getWikiId() { |
94 | return $this->wikiId; |
95 | } |
96 | |
97 | /** |
98 | * @inheritDoc |
99 | * |
100 | * @return int |
101 | */ |
102 | public function getNamespace(): int { |
103 | return $this->namespace; |
104 | } |
105 | |
106 | /** |
107 | * @inheritDoc |
108 | * |
109 | * @return string |
110 | */ |
111 | public function getDBkey(): string { |
112 | return $this->dbKey; |
113 | } |
114 | |
115 | /** |
116 | * @inheritDoc |
117 | */ |
118 | public function isSamePageAs( PageReference $other ): bool { |
119 | // NOTE: keep in sync with Title::isSamePageAs()! |
120 | // NOTE: keep in sync with WikiPage::isSamePageAs()! |
121 | return $this->getWikiId() === $other->getWikiId() |
122 | && $this->getNamespace() === $other->getNamespace() |
123 | && $this->getDBkey() === $other->getDBkey(); |
124 | } |
125 | |
126 | /** |
127 | * Returns a string representation of the title, for logging. This is purely informative |
128 | * and must not be used programmatically. |
129 | * |
130 | * @return string |
131 | */ |
132 | public function __toString(): string { |
133 | $s = '[' . $this->namespace . ':' . $this->dbKey . ']'; |
134 | |
135 | if ( $this->wikiId ) { |
136 | $s .= '@' . $this->wikiId; |
137 | } |
138 | |
139 | return $s; |
140 | } |
141 | |
142 | } |