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 /**
  25  * A special page that list pages that contain no link to other pages
  26  *
  27  * @ingroup SpecialPage
  28  */
  29 class DeadendPagesPage extends PageQueryPage {
  30
  31         function __construct( $name = 'Deadendpages' ) {
  32                 parent::__construct( $name );
  33         }
  34
  35         function getPageHeader() {
  36                 return wfMsgExt( 'deadendpagestext', array( 'parse' ) );
  37         }
  38
  39         /**
  40          * LEFT JOIN is expensive
  41          *
  42          * @return true
  43          */
  44         function isExpensive() {
  45                 return true;
  46         }
  47
  48         function isSyndicated() {
  49                 return false;
  50         }
  51
  52         /**
  53          * @return false
  54          */
  55         function sortDescending() {
  56                 return false;
  57         }
  58
  59         function getQueryInfo() {
  60                 return array(
  61                         'tables' => array( 'page', 'pagelinks' ),
  62                         'fields' => array( 'page_namespace AS namespace',
  63                                         'page_title AS title',
  64                                         'page_title AS value'
  65                         ),
  66                         'conds' => array( 'pl_from IS NULL',
  67                                         'page_namespace' => MWNamespace::getContentNamespaces(),
  68                                         'page_is_redirect' => 0
  69                         ),
  70                         'join_conds' => array( 'pagelinks' => array( 'LEFT JOIN', array(
  71                                         'page_id=pl_from'
  72                         ) ) )
  73                 );
  74         }
  75
  76         function getOrderFields() {
  77                 // For some crazy reason ordering by a constant
  78                 // causes a filesort
  79                 if( count( MWNamespace::getContentNamespaces() ) > 1 ) {
  80                         return array( 'page_namespace', 'page_title' );
  81                 } else {
  82                         return array( 'page_title' );
  83                 }
  84         }
  85 }