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<?php
namespace MediaWiki\Page;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\Page\Hook\WikiPageFactoryHook;
use MediaWiki\Title\Title;
use MediaWiki\Title\TitleFactory;
use stdClass;
use Wikimedia\Rdbms\DBAccessObjectUtils;
use Wikimedia\Rdbms\IConnectionProvider;
/**
* Service for creating WikiPage objects.
*
* @since 1.36
*/
class WikiPageFactory {
private TitleFactory $titleFactory;
private WikiPageFactoryHook $wikiPageFactoryHookRunner;
private IConnectionProvider $dbProvider;
public function __construct(
TitleFactory $titleFactory,
WikiPageFactoryHook $wikiPageFactoryHookRunner,
IConnectionProvider $dbProvider
) {
$this->titleFactory = $titleFactory;
$this->wikiPageFactoryHookRunner = $wikiPageFactoryHookRunner;
$this->dbProvider = $dbProvider;
}
/**
* Create a WikiPage object from a title.
*
* @param PageIdentity $pageIdentity
* @return WikiPage
*/
public function newFromTitle( PageIdentity $pageIdentity ): WikiPage {
if ( $pageIdentity instanceof WikiPage ) {
return $pageIdentity;
}
if ( !$pageIdentity->canExist() ) {
// BC with the Title class
throw new PageAssertionException(
'The given PageIdentity {pageIdentity} does not represent a proper page',
[ 'pageIdentity' => $pageIdentity ]
);
}
$ns = $pageIdentity->getNamespace();
// TODO: remove the need for casting to Title. We'll have to create a new hook to
// replace the WikiPageFactory hook.
$title = Title::newFromPageIdentity( $pageIdentity );
$page = null;
if ( !$this->wikiPageFactoryHookRunner->onWikiPageFactory( $title, $page ) ) {
return $page;
}
switch ( $ns ) {
case NS_FILE:
$page = new WikiFilePage( $title );
break;
case NS_CATEGORY:
$page = new WikiCategoryPage( $title );
break;
default:
$page = new WikiPage( $title );
}
return $page;
}
/**
* Create a WikiPage object from a link target.
*
* @param LinkTarget $title
* @return WikiPage
*/
public function newFromLinkTarget( LinkTarget $title ): WikiPage {
return $this->newFromTitle( $this->titleFactory->newFromLinkTarget( $title ) );
}
/**
* Create a WikiPage object from a database row
*
* @param stdClass $row Database row containing at least fields returned by getQueryInfo().
* @param string|int $from Source of $data:
* - "fromdb" or IDBAccessObject::READ_NORMAL: from a replica DB
* - "fromdbmaster" or IDBAccessObject::READ_LATEST: from the primary DB
* - "forupdate" or IDBAccessObject::READ_LOCKING: from the primary DB using SELECT FOR UPDATE
*
* @return WikiPage
*/
public function newFromRow( $row, $from = 'fromdb' ) {
$page = $this->newFromTitle( $this->titleFactory->newFromRow( $row ) );
$page->loadFromRow( $row, $from );
return $page;
}
/**
* Create a WikiPage object from a page ID
*
* @param int $id Article ID to load
* @param string|int $from One of the following values:
* - "fromdb" or IDBAccessObject::READ_NORMAL to select from a replica DB
* - "fromdbmaster" or IDBAccessObject::READ_LATEST to select from the primary database
*
* @return WikiPage|null Null when no page exists with that ID
*/
public function newFromID( $id, $from = 'fromdb' ) {
// page ids are never 0 or negative, see T63166
if ( $id < 1 ) {
return null;
}
$db = DBAccessObjectUtils::getDBFromRecency( $this->dbProvider, WikiPage::convertSelectType( $from ) );
$pageQuery = WikiPage::getQueryInfo();
$row = $db->newSelectQueryBuilder()
->queryInfo( $pageQuery )
->where( [ 'page_id' => $id ] )
->caller( __METHOD__ )
->fetchRow();
if ( !$row ) {
return null;
}
return $this->newFromRow( $row, $from );
}
}