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* Created on May 13, 2007
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* API for MediaWiki 1.8+
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* Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* http://www.gnu.org/copyleft/gpl.html
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if (!defined('MEDIAWIKI')) {
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// Eclipse helper - will be ignored in production
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require_once ("ApiQueryBase.php");
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* A query module to list all langlinks (links to correspanding foreign language pages).
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class ApiQueryLangLinks extends ApiQueryBase {
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public function __construct($query, $moduleName) {
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parent :: __construct($query, $moduleName, 'll');
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public function execute() {
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if ( $this->getPageSet()->getGoodTitleCount() == 0 )
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$params = $this->extractRequestParams();
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$this->addFields(array (
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$this->addTables('langlinks');
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$this->addWhereFld('ll_from', array_keys($this->getPageSet()->getGoodTitles()));
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if(!is_null($params['continue'])) {
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$cont = explode('|', $params['continue']);
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$this->dieUsage("Invalid continue param. You should pass the " .
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"original value returned by the previous query", "_badcontinue");
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$llfrom = intval($cont[0]);
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$lllang = $this->getDB()->strencode($cont[1]);
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$this->addWhere("ll_from > $llfrom OR ".
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"(ll_from = $llfrom AND ".
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"ll_lang >= '$lllang')");
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# Don't order by ll_from if it's constant in the WHERE clause
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if(count($this->getPageSet()->getGoodTitles()) == 1)
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$this->addOption('ORDER BY', 'll_lang');
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$this->addOption('ORDER BY', 'll_from, ll_lang');
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$this->addOption('LIMIT', $params['limit'] + 1);
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$res = $this->select(__METHOD__);
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$lastId = 0; // database has no ID 0
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while ($row = $db->fetchObject($res)) {
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if (++$count > $params['limit']) {
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// We've reached the one extra which shows that
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// there are additional pages to be had. Stop here...
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$this->setContinueEnumParameter('continue', "{$row->ll_from}|{$row->ll_lang}");
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if ($lastId != $row->ll_from) {
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$this->addPageSubItems($lastId, $data);
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$lastId = $row->ll_from;
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$entry = array('lang' => $row->ll_lang);
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ApiResult :: setContent($entry, $row->ll_title);
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$this->addPageSubItems($lastId, $data);
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$db->freeResult($res);
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public function getAllowedParams() {
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ApiBase :: PARAM_DFLT => 10,
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ApiBase :: PARAM_TYPE => 'limit',
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ApiBase :: PARAM_MIN => 1,
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ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
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ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
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public function getParamDescription () {
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'limit' => 'How many langlinks to return',
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'continue' => 'When more results are available, use this to continue',
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public function getDescription() {
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return 'Returns all interlanguage links from the given page(s)';
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protected function getExamples() {
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"Get interlanguage links from the [[Main Page]]:",
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" api.php?action=query&prop=langlinks&titles=Main%20Page&redirects",
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public function getVersion() {
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return __CLASS__ . ': $Id: ApiQueryLangLinks.php 43271 2008-11-06 22:38:42Z siebrand $';