includes/specials/SpecialMostlinked.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup SpecialPage
   5  */
   6
   7 /**
   8  * A special page to show pages ordered by the number of pages linking to them.
   9  * Implements Special:Mostlinked
  10  *
  11  * @ingroup SpecialPage
  12  *
  13  * @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
  14  * @author Rob Church <robchur@gmail.com>
  15  * @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason
  16  * @copyright © 2006 Rob Church
  17  * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License 2.0 or later
  18  */
  19 class MostlinkedPage extends QueryPage {
  20
  21         function getName() { return 'Mostlinked'; }
  22         function isExpensive() { return true; }
  23         function isSyndicated() { return false; }
  24
  25         function getSQL() {
  26                 global $wgMiserMode;
  27
  28                 $dbr = wfGetDB( DB_SLAVE );
  29
  30                 # In miser mode, reduce the query cost by adding a threshold for large wikis
  31                 if ( $wgMiserMode ) {
  32                         $numPages = SiteStats::pages();
  33                         if ( $numPages > 10000 ) {
  34                                 $cutoff = 100;
  35                         } elseif ( $numPages > 100 ) {
  36                                 $cutoff = intval( sqrt( $numPages ) );
  37                         } else {
  38                                 $cutoff = 1;
  39                         }
  40                 } else {
  41                         $cutoff = 1;
  42                 }
  43
  44                 list( $pagelinks, $page ) = $dbr->tableNamesN( 'pagelinks', 'page' );
  45                 return
  46                         "SELECT 'Mostlinked' AS type,
  47                                 pl_namespace AS namespace,
  48                                 pl_title AS title,
  49                                 COUNT(*) AS value
  50                         FROM $pagelinks
  51                         LEFT JOIN $page ON pl_namespace=page_namespace AND pl_title=page_title
  52                         GROUP BY pl_namespace, pl_title
  53                         HAVING COUNT(*) > $cutoff";
  54         }
  55
  56         /**
  57          * Pre-fill the link cache
  58          */
  59         function preprocessResults( $db, $res ) {
  60                 if( $db->numRows( $res ) > 0 ) {
  61                         $linkBatch = new LinkBatch();
  62                         while( $row = $db->fetchObject( $res ) )
  63                                 $linkBatch->add( $row->namespace, $row->title );
  64                         $db->dataSeek( $res, 0 );
  65                         $linkBatch->execute();
  66                 }
  67         }
  68
  69         /**
  70          * Make a link to "what links here" for the specified title
  71          *
  72          * @param $title Title being queried
  73          * @param $caption String: text to display on the link
  74          * @param $skin Skin to use
  75          * @return String
  76          */
  77         function makeWlhLink( &$title, $caption, &$skin ) {
  78                 $wlh = SpecialPage::getTitleFor( 'Whatlinkshere', $title->getPrefixedDBkey() );
  79                 return $skin->linkKnown( $wlh, $caption );
  80         }
  81
  82         /**
  83          * Make links to the page corresponding to the item, and the "what links here" page for it
  84          *
  85          * @param $skin Skin to be used
  86          * @param $result Result row
  87          * @return string
  88          */
  89         function formatResult( $skin, $result ) {
  90                 global $wgLang;
  91                 $title = Title::makeTitleSafe( $result->namespace, $result->title );
  92                 if ( !$title ) {
  93                         return '<!-- ' . htmlspecialchars( "Invalid title: [[$title]]" ) . ' -->';
  94                 }
  95                 $link = $skin->link( $title );
  96                 $wlh = $this->makeWlhLink( $title,
  97                         wfMsgExt( 'nlinks', array( 'parsemag', 'escape'),
  98                                 $wgLang->formatNum( $result->value ) ), $skin );
  99                 return wfSpecialList( $link, $wlh );
 100         }
 101 }
 102
 103 /**
 104  * constructor
 105  */
 106 function wfSpecialMostlinked() {
 107         list( $limit, $offset ) = wfCheckLimits();
 108
 109         $wpp = new MostlinkedPage();
 110
 111         $wpp->doQuery( $offset, $limit );
 112 }