SpecialDeadendPages.php

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<?php
use MediaWiki\Cache\LinkBatchFactory;
use MediaWiki\Languages\LanguageConverterFactory;
use Wikimedia\Rdbms\ILoadBalancer;
 
class SpecialDeadendPages extends PageQueryPage {
 
    private $namespaceInfo;
 
    public function __construct(
        NamespaceInfo $namespaceInfo,
        ILoadBalancer $loadBalancer,
        LinkBatchFactory $linkBatchFactory,
        LanguageConverterFactory $languageConverterFactory
    ) {
        parent::__construct( 'Deadendpages' );
        $this->namespaceInfo = $namespaceInfo;
        $this->setDBLoadBalancer( $loadBalancer );
        $this->setLinkBatchFactory( $linkBatchFactory );
        $this->setLanguageConverter( $languageConverterFactory->getLanguageConverter( $this->getContentLanguage() ) );
    }
 
    protected function getPageHeader() {
        return $this->msg( 'deadendpagestext' )->parseAsBlock();
    }
 
    public function isExpensive() {
        return true;
    }
 
    public function isSyndicated() {
        return false;
    }
 
    protected function sortDescending() {
        return false;
    }
 
    public function getQueryInfo() {
        return [
            'tables' => [ 'page', 'pagelinks' ],
            'fields' => [
                'namespace' => 'page_namespace',
                'title' => 'page_title',
            ],
            'conds' => [
                'pl_from IS NULL',
                'page_namespace' => $this->namespaceInfo->getContentNamespaces(),
                'page_is_redirect' => 0
            ],
            'join_conds' => [
                'pagelinks' => [
                    'LEFT JOIN',
                    [ 'page_id=pl_from' ]
                ]
            ]
        ];
    }
 
    protected function getOrderFields() {
        // For some crazy reason ordering by a constant
        // causes a filesort
        if ( count( $this->namespaceInfo->getContentNamespaces() ) > 1 ) {
            return [ 'page_namespace', 'page_title' ];
        } else {
            return [ 'page_title' ];
        }
    }
 
    protected function getGroupName() {
        return 'maintenance';
    }
}