SpecialLonelypages.php

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<?php
class LonelyPagesPage extends PageQueryPage {

        function __construct( $name = 'Lonelypages' ) {
                parent::__construct( $name );
        }

        function getPageHeader() {
                return $this->msg( 'lonelypagestext' )->parseAsBlock();
        }

        function sortDescending() {
                return false;
        }

        function isExpensive() {
                return true;
        }

        function isSyndicated() {
                return false;
        }

        function getQueryInfo() {
                return array (
                        'tables' => array ( 'page', 'pagelinks',
                                        'templatelinks' ),
                        'fields' => array ( 'namespace' => 'page_namespace',
                                        'title' => 'page_title',
                                        'value' => 'page_title' ),
                        'conds' => array ( 'pl_namespace IS NULL',
                                        'page_namespace' => MWNamespace::getContentNamespaces(),
                                        'page_is_redirect' => 0,
                                        'tl_namespace IS NULL' ),
                        'join_conds' => array (
                                        'pagelinks' => array (
                                                'LEFT JOIN', array (
                                                'pl_namespace = page_namespace',
                                                'pl_title = page_title' ) ),
                                        'templatelinks' => array (
                                                'LEFT JOIN', array (
                                                'tl_namespace = page_namespace',
                                                'tl_title = page_title' ) ) )
                );
        }

        function getOrderFields() {
                // For some crazy reason ordering by a constant
                // causes a filesort in MySQL 5
                if( count( MWNamespace::getContentNamespaces() ) > 1 ) {
                        return array( 'page_namespace', 'page_title' );
                } else {
                        return array( 'page_title' );
                }
        }

        protected function getGroupName() {
                return 'maintenance';
        }
}