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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 InvalidArgumentException; |
24 | use Wikimedia\Assert\Assert; |
25 | |
26 | /** |
27 | * Immutable value object representing a page identity. |
28 | * |
29 | * Instances of this class are expected to always represent proper pages, that is, |
30 | * pages that can at least potentially exist as editable pages on the wiki. |
31 | * This class cannot represent Special pages, interwiki links, section links, etc. |
32 | * |
33 | * Code that deserializes instances of PageIdentityValue must ensure that the original |
34 | * meaning of the "local" Wiki ID is preserved: When an instance of PageIdentityValue |
35 | * is created with self::LOCAL as the Wiki ID on one wiki, gets serialized, |
36 | * stored, and later read and unserialized on another wiki, the value of the Wiki ID |
37 | * must be adjusted to refer to the original wiki. |
38 | * |
39 | * @see https://www.mediawiki.org/wiki/Manual:Modeling_pages |
40 | * |
41 | * @since 1.36 |
42 | */ |
43 | class PageIdentityValue extends PageReferenceValue implements ProperPageIdentity { |
44 | |
45 | /** @var int */ |
46 | private $pageId; |
47 | |
48 | /** |
49 | * Constructs a PageIdentityValue, or returns null if the parameters are not valid. |
50 | * |
51 | * @note This does not perform any normalization, and only basic validation. |
52 | * For full normalization and validation, use TitleParser::makeTitleValueSafe() |
53 | * together with PageLookup::getPageForLink(). |
54 | * |
55 | * @param int $pageId The ID of this page, or 0 if the page does not exist. |
56 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
57 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
58 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
59 | * or self::LOCAL for the local wiki. |
60 | * |
61 | * @return PageIdentityValue|null |
62 | */ |
63 | public static function tryNew( int $pageId, int $namespace, string $dbKey, $wikiId ) { |
64 | try { |
65 | return new static( $pageId, $namespace, $dbKey, $wikiId ); |
66 | } catch ( InvalidArgumentException $ex ) { |
67 | return null; |
68 | } |
69 | } |
70 | |
71 | /** |
72 | * @param int $pageId The ID of this page, or 0 if the page does not exist. |
73 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
74 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
75 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
76 | * or self::LOCAL for the local wiki. |
77 | */ |
78 | public function __construct( int $pageId, int $namespace, string $dbKey, $wikiId ) { |
79 | Assert::parameter( $pageId >= 0, '$pageId', 'must not be negative' ); |
80 | Assert::parameter( $namespace >= 0, '$namespace', 'must not be negative' ); |
81 | |
82 | // Not full validation, intended to help detect lack of validation in the caller. |
83 | Assert::parameter( |
84 | !preg_match( '/[#|]/', $dbKey ), |
85 | '$dbKey', |
86 | 'must not contain pipes or hashes: ' . $dbKey |
87 | ); |
88 | |
89 | parent::__construct( $namespace, $dbKey, $wikiId ); |
90 | |
91 | $this->pageId = $pageId; |
92 | } |
93 | |
94 | /** |
95 | * Create PageIdentity for a local page. |
96 | * |
97 | * @param int $pageId |
98 | * @param int $namespace |
99 | * @param string $dbKey |
100 | * @return PageIdentityValue |
101 | */ |
102 | public static function localIdentity( int $pageId, int $namespace, string $dbKey ): self { |
103 | return new self( $pageId, $namespace, $dbKey, self::LOCAL ); |
104 | } |
105 | |
106 | /** |
107 | * The numerical page ID provided to the constructor. |
108 | * |
109 | * @param string|false $wikiId The wiki ID expected by the caller. |
110 | * Omit if expecting the local wiki. |
111 | * |
112 | * @return int |
113 | */ |
114 | public function getId( $wikiId = self::LOCAL ): int { |
115 | $this->assertWiki( $wikiId ); |
116 | return $this->pageId; |
117 | } |
118 | |
119 | /** |
120 | * Returns whether the page currently exists. |
121 | * Returns true if getId() returns a value greater than zero. |
122 | * @return bool |
123 | */ |
124 | public function exists(): bool { |
125 | return $this->getId( $this->getWikiId() ) > 0; |
126 | } |
127 | |
128 | /** |
129 | * @return bool always true |
130 | */ |
131 | public function canExist(): bool { |
132 | return true; |
133 | } |
134 | |
135 | } |