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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 Wikimedia\Assert\Assert; |
25 | use Wikimedia\NonSerializable\NonSerializableTrait; |
26 | |
27 | /** |
28 | * Immutable value object representing a page reference. |
29 | * |
30 | * Instances of this class are expected to always represent a viewable pages, that is, |
31 | * pages that can at least potentially be visited on the wiki. |
32 | * This class may represent Special pages, but not interwiki links, section links, etc. |
33 | * |
34 | * Code that deserializes instances of PageReferenceValue must ensure that the original |
35 | * meaning of the "local" Wiki ID is preserved: When an instance of PageReferenceValue |
36 | * is created with self::LOCAL as the Wiki ID on one wiki, gets serialized, |
37 | * stored, and later read and unserialized on another wiki, the value of the Wiki ID |
38 | * must be adjusted to refer to the original wiki. |
39 | * |
40 | * @since 1.37 |
41 | */ |
42 | class PageReferenceValue implements PageReference { |
43 | |
44 | /* Use JSON, but beware the note on serialization above. */ |
45 | use NonSerializableTrait; |
46 | use WikiAwareEntityTrait; |
47 | |
48 | /** @var int */ |
49 | private $namespace; |
50 | |
51 | /** @var string */ |
52 | private $dbKey; |
53 | |
54 | /** @var string|false */ |
55 | private $wikiId; |
56 | |
57 | /** |
58 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
59 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
60 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
61 | * or self::LOCAL for the local wiki. |
62 | */ |
63 | public function __construct( int $namespace, string $dbKey, $wikiId ) { |
64 | $this->assertWikiIdParam( $wikiId ); |
65 | |
66 | Assert::parameter( $dbKey !== '', '$dbKey', 'must not be empty' ); |
67 | |
68 | // Replace spaces with underscores |
69 | $dbKey = str_replace( ' ', '_', $dbKey ); |
70 | |
71 | $this->wikiId = $wikiId; |
72 | $this->namespace = $namespace; |
73 | $this->dbKey = $dbKey; |
74 | } |
75 | |
76 | /** |
77 | * Create PageReference for a local page. |
78 | * |
79 | * @param int $namespace |
80 | * @param string $dbKey |
81 | * @return PageReferenceValue |
82 | */ |
83 | public static function localReference( int $namespace, string $dbKey ): self { |
84 | return new self( $namespace, $dbKey, self::LOCAL ); |
85 | } |
86 | |
87 | /** |
88 | * Get the ID of the wiki provided to the constructor. |
89 | * |
90 | * @return string|false |
91 | */ |
92 | public function getWikiId() { |
93 | return $this->wikiId; |
94 | } |
95 | |
96 | /** |
97 | * @inheritDoc |
98 | * |
99 | * @return int |
100 | */ |
101 | public function getNamespace(): int { |
102 | return $this->namespace; |
103 | } |
104 | |
105 | /** |
106 | * @inheritDoc |
107 | * |
108 | * @return string |
109 | */ |
110 | public function getDBkey(): string { |
111 | return $this->dbKey; |
112 | } |
113 | |
114 | /** |
115 | * @inheritDoc |
116 | */ |
117 | public function isSamePageAs( PageReference $other ): bool { |
118 | // NOTE: keep in sync with Title::isSamePageAs()! |
119 | // NOTE: keep in sync with WikiPage::isSamePageAs()! |
120 | return $this->getWikiId() === $other->getWikiId() |
121 | && $this->getNamespace() === $other->getNamespace() |
122 | && $this->getDBkey() === $other->getDBkey(); |
123 | } |
124 | |
125 | /** |
126 | * Returns a string representation of the title, for logging. This is purely informative |
127 | * and must not be used programmatically. |
128 | * |
129 | * @return string |
130 | */ |
131 | public function __toString(): string { |
132 | $s = '[' . $this->namespace . ':' . $this->dbKey . ']'; |
133 | |
134 | if ( $this->wikiId ) { |
135 | $s .= '@' . $this->wikiId; |
136 | } |
137 | |
138 | return $s; |
139 | } |
140 | |
141 | } |