includes/specials/SpecialDeadendpages.php

   1 <?php
   2 /**
   3  * Implements Special:Deadenpages
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * A special page that list pages that contain no link to other pages
  28  *
  29  * @ingroup SpecialPage
  30  */
  31 class DeadendPagesPage extends PageQueryPage {
  32
  33         function __construct( $name = 'Deadendpages' ) {
  34                 parent::__construct( $name );
  35         }
  36
  37         function getPageHeader() {
  38                 return $this->msg( 'deadendpagestext' )->parseAsBlock();
  39         }
  40
  41         /**
  42          * LEFT JOIN is expensive
  43          *
  44          * @return bool
  45          */
  46         function isExpensive() {
  47                 return true;
  48         }
  49
  50         function isSyndicated() {
  51                 return false;
  52         }
  53
  54         /**
  55          * @return bool
  56          */
  57         function sortDescending() {
  58                 return false;
  59         }
  60
  61         function getQueryInfo() {
  62                 return [
  63                         'tables' => [ 'page', 'pagelinks' ],
  64                         'fields' => [
  65                                 'namespace' => 'page_namespace',
  66                                 'title' => 'page_title',
  67                                 'value' => 'page_title'
  68                         ],
  69                         'conds' => [
  70                                 'pl_from IS NULL',
  71                                 'page_namespace' => MediaWikiServices::getInstance()->getNamespaceInfo()->
  72                                         getContentNamespaces(),
  73                                 'page_is_redirect' => 0
  74                         ],
  75                         'join_conds' => [
  76                                 'pagelinks' => [
  77                                         'LEFT JOIN',
  78                                         [ 'page_id=pl_from' ]
  79                                 ]
  80                         ]
  81                 ];
  82         }
  83
  84         function getOrderFields() {
  85                 // For some crazy reason ordering by a constant
  86                 // causes a filesort
  87                 if ( count( MediaWikiServices::getInstance()->getNamespaceInfo()->
  88                         getContentNamespaces() ) > 1
  89                 ) {
  90                         return [ 'page_namespace', 'page_title' ];
  91                 } else {
  92                         return [ 'page_title' ];
  93                 }
  94         }
  95
  96         protected function getGroupName() {
  97                 return 'maintenance';
  98         }
  99 }