SubpageImportTitleFactory.php

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<?php
class SubpageImportTitleFactory implements ImportTitleFactory {
    private $titleFactory;
 
    private $rootPage;
 
    public function __construct(
        NamespaceInfo $namespaceInfo,
        TitleFactory $titleFactory,
        Title $rootPage
    ) {
        if ( !$namespaceInfo->hasSubpages( $rootPage->getNamespace() ) ) {
            throw new MWException( "The root page you specified, $rootPage, is in a " .
                "namespace where subpages are not allowed" );
        }
        $this->titleFactory = $titleFactory;
        $this->rootPage = $rootPage;
    }
 
    public function createTitleFromForeignTitle( ForeignTitle $foreignTitle ) {
        return $this->titleFactory->newFromText(
            $this->rootPage->getPrefixedDBkey() . '/' . $foreignTitle->getFullText()
        );
    }
}