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<?php
/**
* Implements Special:ListDuplicatedFiles
*
* Copyright © 2013 Brian Wolff
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup SpecialPage
* @author Brian Wolff
*/
/**
* Special:ListDuplicatedFiles Lists all files where the current version is
* a duplicate of the current version of some other file.
* @ingroup SpecialPage
*/
class ListDuplicatedFilesPage extends QueryPage {
function __construct( $name = 'ListDuplicatedFiles' ) {
parent::__construct( $name );
}
public function isExpensive() {
return true;
}
function isSyndicated() {
return false;
}
/**
* Get all the duplicates by grouping on sha1s.
*
* A cheaper (but less useful) version of this
* query would be to not care how many duplicates a
* particular file has, and do a self-join on image table.
* However this version should be no more expensive then
* Special:MostLinked, which seems to get handled fine
* with however we are doing cached special pages.
* @return array
*/
public function getQueryInfo() {
return array(
'tables' => array( 'image' ),
'fields' => array(
'namespace' => NS_FILE,
'title' => 'MIN(img_name)',
'value' => 'count(*)'
),
'options' => array(
'GROUP BY' => 'img_sha1',
'HAVING' => 'count(*) > 1',
),
);
}
/**
* Pre-fill the link cache
*
* @param IDatabase $db
* @param ResultWrapper $res
*/
function preprocessResults( $db, $res ) {
if ( $res->numRows() > 0 ) {
$linkBatch = new LinkBatch();
foreach ( $res as $row ) {
$linkBatch->add( $row->namespace, $row->title );
}
$res->seek( 0 );
$linkBatch->execute();
}
}
/**
* @param Skin $skin
* @param object $result Result row
* @return string
*/
function formatResult( $skin, $result ) {
// Future version might include a list of the first 5 duplicates
// perhaps separated by an "↔".
$image1 = Title::makeTitle( $result->namespace, $result->title );
$dupeSearch = SpecialPage::getTitleFor( 'FileDuplicateSearch', $image1->getDBKey() );
$msg = $this->msg( 'listduplicatedfiles-entry' )
->params( $image1->getText() )
->numParams( $result->value - 1 )
->params( $dupeSearch->getPrefixedDBKey() );
return $msg->parse();
}
protected function getGroupName() {
return 'media';
}
}
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