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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace MediaWiki\Page; |
| 8 | |
| 9 | use MediaWiki\DAO\WikiAwareEntityTrait; |
| 10 | use Stringable; |
| 11 | use Wikimedia\Assert\Assert; |
| 12 | use Wikimedia\NonSerializable\NonSerializableTrait; |
| 13 | |
| 14 | /** |
| 15 | * Immutable value object representing a page reference. |
| 16 | * |
| 17 | * Instances of this class are expected to always represent a viewable pages, that is, |
| 18 | * pages that can at least potentially be visited on the wiki. |
| 19 | * This class may represent Special pages, but not interwiki links, section links, etc. |
| 20 | * |
| 21 | * Code that deserializes instances of PageReferenceValue must ensure that the original |
| 22 | * meaning of the "local" Wiki ID is preserved: When an instance of PageReferenceValue |
| 23 | * is created with self::LOCAL as the Wiki ID on one wiki, gets serialized, |
| 24 | * stored, and later read and unserialized on another wiki, the value of the Wiki ID |
| 25 | * must be adjusted to refer to the original wiki. |
| 26 | * |
| 27 | * @since 1.37 |
| 28 | */ |
| 29 | class PageReferenceValue implements Stringable, PageReference { |
| 30 | |
| 31 | /* Use JSON, but beware the note on serialization above. */ |
| 32 | use NonSerializableTrait; |
| 33 | use WikiAwareEntityTrait; |
| 34 | |
| 35 | /** @var int */ |
| 36 | private $namespace; |
| 37 | |
| 38 | /** @var string */ |
| 39 | private $dbKey; |
| 40 | |
| 41 | /** @var string|false */ |
| 42 | private $wikiId; |
| 43 | |
| 44 | /** |
| 45 | * @param int $namespace A valid namespace ID. Validation is the caller's responsibility! |
| 46 | * @param string $dbKey A valid DB key. Validation is the caller's responsibility! |
| 47 | * @param string|false $wikiId The Id of the wiki this page belongs to, |
| 48 | * or self::LOCAL for the local wiki. The method {@link PageReferenceValue::localReference} |
| 49 | * is available as a shorthand for local wikis (only requires 2 parameters). |
| 50 | */ |
| 51 | public function __construct( int $namespace, string $dbKey, $wikiId ) { |
| 52 | $this->assertWikiIdParam( $wikiId ); |
| 53 | |
| 54 | Assert::parameter( $dbKey !== '', '$dbKey', 'must not be empty' ); |
| 55 | |
| 56 | // Replace spaces with underscores |
| 57 | $dbKey = str_replace( ' ', '_', $dbKey ); |
| 58 | |
| 59 | $this->wikiId = $wikiId; |
| 60 | $this->namespace = $namespace; |
| 61 | $this->dbKey = $dbKey; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Create PageReference for a local page. |
| 66 | * |
| 67 | * @param int $namespace |
| 68 | * @param string $dbKey |
| 69 | * @return PageReferenceValue |
| 70 | */ |
| 71 | public static function localReference( int $namespace, string $dbKey ): self { |
| 72 | return new self( $namespace, $dbKey, self::LOCAL ); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Get the ID of the wiki provided to the constructor. |
| 77 | * |
| 78 | * @return string|false |
| 79 | */ |
| 80 | public function getWikiId() { |
| 81 | return $this->wikiId; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * @inheritDoc |
| 86 | * |
| 87 | * @return int |
| 88 | */ |
| 89 | public function getNamespace(): int { |
| 90 | return $this->namespace; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * @inheritDoc |
| 95 | * |
| 96 | * @return string |
| 97 | */ |
| 98 | public function getDBkey(): string { |
| 99 | return $this->dbKey; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * @inheritDoc |
| 104 | */ |
| 105 | public function isSamePageAs( PageReference $other ): bool { |
| 106 | // NOTE: keep in sync with Title::isSamePageAs()! |
| 107 | // NOTE: keep in sync with WikiPage::isSamePageAs()! |
| 108 | return $this->getWikiId() === $other->getWikiId() |
| 109 | && $this->getNamespace() === $other->getNamespace() |
| 110 | && $this->getDBkey() === $other->getDBkey(); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Returns a string representation of the title, for logging. This is purely informative |
| 115 | * and must not be used programmatically. |
| 116 | */ |
| 117 | public function __toString(): string { |
| 118 | $s = '[' . $this->namespace . ':' . $this->dbKey . ']'; |
| 119 | |
| 120 | if ( $this->wikiId ) { |
| 121 | $s .= '@' . $this->wikiId; |
| 122 | } |
| 123 | |
| 124 | return $s; |
| 125 | } |
| 126 | |
| 127 | } |