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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Utils; |
| 4 | |
| 5 | use BatchRowIterator; |
| 6 | use EchoCallbackIterator; |
| 7 | use Iterator; |
| 8 | use IteratorAggregate; |
| 9 | use MediaWiki\Title\Title; |
| 10 | use RecursiveIteratorIterator; |
| 11 | use Wikimedia\Rdbms\IDatabase; |
| 12 | |
| 13 | /** |
| 14 | * Iterates over all titles that have the specified page property |
| 15 | */ |
| 16 | class PagesWithPropertyIterator implements IteratorAggregate { |
| 17 | /** |
| 18 | * @var IDatabase |
| 19 | */ |
| 20 | protected $db; |
| 21 | |
| 22 | /** |
| 23 | * @var string |
| 24 | */ |
| 25 | protected $propName; |
| 26 | |
| 27 | /** |
| 28 | * Page id to start at (inclusive) |
| 29 | * |
| 30 | * @var int|null |
| 31 | */ |
| 32 | protected $startId = null; |
| 33 | |
| 34 | /** |
| 35 | * Page id to stop at (exclusive) |
| 36 | * |
| 37 | * @var int|null |
| 38 | */ |
| 39 | protected $stopId = null; |
| 40 | |
| 41 | /** |
| 42 | * @param IDatabase $db |
| 43 | * @param string $propName |
| 44 | * @param int|null $startId Page id to start at (inclusive) |
| 45 | * @param int|null $stopId Page id to stop at (exclusive) |
| 46 | */ |
| 47 | public function __construct( IDatabase $db, $propName, $startId = null, $stopId = null ) { |
| 48 | $this->db = $db; |
| 49 | $this->propName = $propName; |
| 50 | $this->startId = $startId; |
| 51 | $this->stopId = $stopId; |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * @return Iterator<Title> |
| 56 | */ |
| 57 | public function getIterator() { |
| 58 | $it = new BatchRowIterator( |
| 59 | $this->db, |
| 60 | /* tables */ [ 'page_props', 'page' ], |
| 61 | /* pk */ 'pp_page', |
| 62 | /* rows per batch */ 500 |
| 63 | ); |
| 64 | |
| 65 | $conditions = [ 'pp_propname' => $this->propName ]; |
| 66 | if ( $this->startId !== null ) { |
| 67 | $conditions[] = 'pp_page >= ' . $this->db->addQuotes( $this->startId ); |
| 68 | } |
| 69 | if ( $this->stopId !== null ) { |
| 70 | $conditions[] = 'pp_page < ' . $this->db->addQuotes( $this->stopId ); |
| 71 | } |
| 72 | $it->addConditions( $conditions ); |
| 73 | |
| 74 | $it->addJoinConditions( [ |
| 75 | 'page' => [ 'JOIN', 'pp_page=page_id' ], |
| 76 | ] ); |
| 77 | $it->setFetchColumns( [ 'page_namespace', 'page_title' ] ); |
| 78 | $it->setCaller( __METHOD__ ); |
| 79 | |
| 80 | $it = new RecursiveIteratorIterator( $it ); |
| 81 | |
| 82 | return new EchoCallbackIterator( $it, static function ( $row ) { |
| 83 | return Title::makeTitle( $row->page_namespace, $row->page_title ); |
| 84 | } ); |
| 85 | } |
| 86 | } |