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<?php
/*
* Created on May 12, 2007
*
* API for MediaWiki 1.8+
*
* Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
*
* 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* http://www.gnu.org/copyleft/gpl.html
*/
if ( !defined( 'MEDIAWIKI' ) ) {
// Eclipse helper - will be ignored in production
require_once ( "ApiQueryBase.php" );
}
/**
* A query module to list all wiki links on a given set of pages.
*
* @ingroup API
*/
class ApiQueryLinks extends ApiQueryGeneratorBase {
const LINKS = 'links';
const TEMPLATES = 'templates';
private $table, $prefix, $description;
public function __construct( $query, $moduleName ) {
switch ( $moduleName ) {
case self::LINKS :
$this->table = 'pagelinks';
$this->prefix = 'pl';
$this->description = 'link';
break;
case self::TEMPLATES :
$this->table = 'templatelinks';
$this->prefix = 'tl';
$this->description = 'template';
break;
default :
ApiBase :: dieDebug( __METHOD__, 'Unknown module name' );
}
parent :: __construct( $query, $moduleName, $this->prefix );
}
public function execute() {
$this->run();
}
public function getCacheMode( $params ) {
return 'public';
}
public function executeGenerator( $resultPageSet ) {
$this->run( $resultPageSet );
}
private function run( $resultPageSet = null ) {
if ( $this->getPageSet()->getGoodTitleCount() == 0 )
return; // nothing to do
$params = $this->extractRequestParams();
$this->addFields( array (
$this->prefix . '_from AS pl_from',
$this->prefix . '_namespace AS pl_namespace',
$this->prefix . '_title AS pl_title'
) );
$this->addTables( $this->table );
$this->addWhereFld( $this->prefix . '_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
$this->addWhereFld( $this->prefix . '_namespace', $params['namespace'] );
if ( !is_null( $params['continue'] ) ) {
$cont = explode( '|', $params['continue'] );
if ( count( $cont ) != 3 )
$this->dieUsage( "Invalid continue param. You should pass the " .
"original value returned by the previous query", "_badcontinue" );
$plfrom = intval( $cont[0] );
$plns = intval( $cont[1] );
$pltitle = $this->getDB()->strencode( $this->titleToKey( $cont[2] ) );
$this->addWhere( "{$this->prefix}_from > $plfrom OR " .
"({$this->prefix}_from = $plfrom AND " .
"({$this->prefix}_namespace > $plns OR " .
"({$this->prefix}_namespace = $plns AND " .
"{$this->prefix}_title >= '$pltitle')))" );
}
// Here's some MySQL craziness going on: if you use WHERE foo='bar'
// and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless
// but instead goes and filesorts, because the index for foo was used
// already. To work around this, we drop constant fields in the WHERE
// clause from the ORDER BY clause
$order = array();
if ( count( $this->getPageSet()->getGoodTitles() ) != 1 )
$order[] = "{$this->prefix}_from";
if ( count( $params['namespace'] ) != 1 )
$order[] = "{$this->prefix}_namespace";
$order[] = "{$this->prefix}_title";
$this->addOption( 'ORDER BY', implode( ", ", $order ) );
$this->addOption( 'USE INDEX', "{$this->prefix}_from" );
$this->addOption( 'LIMIT', $params['limit'] + 1 );
$db = $this->getDB();
$res = $this->select( __METHOD__ );
if ( is_null( $resultPageSet ) ) {
$count = 0;
while ( $row = $db->fetchObject( $res ) ) {
if ( ++$count > $params['limit'] ) {
// We've reached the one extra which shows that
// there are additional pages to be had. Stop here...
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|" .
$this->keyToTitle( $row->pl_title ) );
break;
}
$vals = array();
ApiQueryBase :: addTitleInfo( $vals, Title :: makeTitle( $row->pl_namespace, $row->pl_title ) );
$fit = $this->addPageSubItem( $row->pl_from, $vals );
if ( !$fit )
{
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|" .
$this->keyToTitle( $row->pl_title ) );
break;
}
}
} else {
$titles = array();
$count = 0;
while ( $row = $db->fetchObject( $res ) ) {
if ( ++$count > $params['limit'] ) {
// We've reached the one extra which shows that
// there are additional pages to be had. Stop here...
$this->setContinueEnumParameter( 'continue',
"{$row->pl_from}|{$row->pl_namespace}|" .
$this->keyToTitle( $row->pl_title ) );
break;
}
$titles[] = Title :: makeTitle( $row->pl_namespace, $row->pl_title );
}
$resultPageSet->populateFromTitles( $titles );
}
$db->freeResult( $res );
}
public function getAllowedParams()
{
return array(
'namespace' => array(
ApiBase :: PARAM_TYPE => 'namespace',
ApiBase :: PARAM_ISMULTI => true
),
'limit' => array(
ApiBase :: PARAM_DFLT => 10,
ApiBase :: PARAM_TYPE => 'limit',
ApiBase :: PARAM_MIN => 1,
ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
),
'continue' => null,
);
}
public function getParamDescription()
{
return array(
'namespace' => "Show {$this->description}s in this namespace(s) only",
'limit' => "How many {$this->description}s to return",
'continue' => 'When more results are available, use this to continue',
);
}
public function getDescription() {
return "Returns all {$this->description}s from the given page(s)";
}
protected function getExamples() {
return array (
"Get {$this->description}s from the [[Main Page]]:",
" api.php?action=query&prop={$this->getModuleName()}&titles=Main%20Page",
"Get information about the {$this->description} pages in the [[Main Page]]:",
" api.php?action=query&generator={$this->getModuleName()}&titles=Main%20Page&prop=info",
"Get {$this->description}s from the Main Page in the User and Template namespaces:",
" api.php?action=query&prop={$this->getModuleName()}&titles=Main%20Page&{$this->prefix}namespace=2|10"
);
}
public function getVersion() {
return __CLASS__ . ': $Id: ApiQueryLinks.php 69932 2010-07-26 08:03:21Z tstarling $';
}
}
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