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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Deferred\LinksUpdate; |
| 4 | |
| 5 | use MediaWiki\Page\PageReferenceValue; |
| 6 | use MediaWiki\Title\Title; |
| 7 | |
| 8 | /** |
| 9 | * Shared code for pagelinks, templatelinks and existencelinks. These tables |
| 10 | * all link to an arbitrary page identified by namespace and title. |
| 11 | * |
| 12 | * Link ID format: string[]: |
| 13 | * - 0: namespace ID |
| 14 | * - 1: title DB key |
| 15 | * |
| 16 | * @since 1.38 |
| 17 | */ |
| 18 | abstract class GenericPageLinksTable extends TitleLinksTable { |
| 19 | /** |
| 20 | * A 2d array representing the new links, with the namespace ID in the |
| 21 | * first key, the DB key in the second key, and the value arbitrary. |
| 22 | * |
| 23 | * @var array |
| 24 | */ |
| 25 | protected $newLinks = []; |
| 26 | |
| 27 | /** |
| 28 | * The existing links in the same format as self::$newLinks, or null if it |
| 29 | * has not been loaded yet. |
| 30 | * |
| 31 | * @var array|null |
| 32 | */ |
| 33 | private $existingLinks; |
| 34 | |
| 35 | /** |
| 36 | * @return string|null |
| 37 | */ |
| 38 | abstract protected function getFromNamespaceField(); |
| 39 | |
| 40 | /** @inheritDoc */ |
| 41 | protected function getExistingFields() { |
| 42 | return [ |
| 43 | 'ns' => 'lt_namespace', |
| 44 | 'title' => 'lt_title', |
| 45 | ]; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Get existing links as an associative array |
| 50 | * |
| 51 | * @return array |
| 52 | */ |
| 53 | private function getExistingLinks() { |
| 54 | if ( $this->existingLinks === null ) { |
| 55 | $this->existingLinks = []; |
| 56 | foreach ( $this->fetchExistingRows() as $row ) { |
| 57 | $this->existingLinks[$row->ns][$row->title] = 1; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | return $this->existingLinks; |
| 62 | } |
| 63 | |
| 64 | /** @inheritDoc */ |
| 65 | protected function getNewLinkIDs() { |
| 66 | foreach ( $this->newLinks as $ns => $links ) { |
| 67 | foreach ( $links as $dbk => $unused ) { |
| 68 | yield [ $ns, (string)$dbk ]; |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | /** @inheritDoc */ |
| 74 | protected function getExistingLinkIDs() { |
| 75 | foreach ( $this->getExistingLinks() as $ns => $links ) { |
| 76 | foreach ( $links as $dbk => $unused ) { |
| 77 | yield [ $ns, (string)$dbk ]; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /** @inheritDoc */ |
| 83 | protected function isExisting( $linkId ) { |
| 84 | [ $ns, $dbk ] = $linkId; |
| 85 | return isset( $this->getExistingLinks()[$ns][$dbk] ); |
| 86 | } |
| 87 | |
| 88 | /** @inheritDoc */ |
| 89 | protected function isInNewSet( $linkId ) { |
| 90 | [ $ns, $dbk ] = $linkId; |
| 91 | return isset( $this->newLinks[$ns][$dbk] ); |
| 92 | } |
| 93 | |
| 94 | /** @inheritDoc */ |
| 95 | protected function insertLink( $linkId ) { |
| 96 | $row = []; |
| 97 | $fromNamespaceField = $this->getFromNamespaceField(); |
| 98 | if ( $fromNamespaceField !== null ) { |
| 99 | $row[$fromNamespaceField] = $this->getSourcePage()->getNamespace(); |
| 100 | } |
| 101 | $row[$this->getTargetIdField()] = $this->linkTargetLookup->acquireLinkTargetId( |
| 102 | $this->makeTitle( $linkId ), |
| 103 | $this->getDB() |
| 104 | ); |
| 105 | $this->insertRow( $row ); |
| 106 | } |
| 107 | |
| 108 | /** @inheritDoc */ |
| 109 | protected function deleteLink( $linkId ) { |
| 110 | $this->deleteRow( [ |
| 111 | $this->getTargetIdField() => $this->linkTargetLookup->acquireLinkTargetId( |
| 112 | $this->makeTitle( $linkId ), |
| 113 | $this->getDB() |
| 114 | ) |
| 115 | ] ); |
| 116 | } |
| 117 | |
| 118 | /** @inheritDoc */ |
| 119 | protected function needForcedLinkRefresh() { |
| 120 | return $this->isCrossNamespaceMove(); |
| 121 | } |
| 122 | |
| 123 | /** @inheritDoc */ |
| 124 | protected function makePageReferenceValue( $linkId ): PageReferenceValue { |
| 125 | return PageReferenceValue::localReference( $linkId[0], $linkId[1] ); |
| 126 | } |
| 127 | |
| 128 | /** @inheritDoc */ |
| 129 | protected function makeTitle( $linkId ): Title { |
| 130 | return Title::makeTitle( $linkId[0], $linkId[1] ); |
| 131 | } |
| 132 | |
| 133 | /** @inheritDoc */ |
| 134 | protected function deduplicateLinkIds( $linkIds ) { |
| 135 | $seen = []; |
| 136 | foreach ( $linkIds as $linkId ) { |
| 137 | if ( !isset( $seen[$linkId[0]][$linkId[1]] ) ) { |
| 138 | $seen[$linkId[0]][$linkId[1]] = true; |
| 139 | yield $linkId; |
| 140 | } |
| 141 | } |
| 142 | } |
| 143 | } |