includes/api/ApiQueryLangLinks.php

   1 <?php
   2
   3 /*
   4  * Created on May 13, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if (!defined('MEDIAWIKI')) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ("ApiQueryBase.php");
  29 }
  30
  31 /**
  32  * A query module to list all langlinks (links to correspanding foreign language pages).
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQueryLangLinks extends ApiQueryBase {
  37
  38         public function __construct($query, $moduleName) {
  39                 parent :: __construct($query, $moduleName, 'll');
  40         }
  41
  42         public function execute() {
  43                 if ( $this->getPageSet()->getGoodTitleCount() == 0 )
  44                         return;
  45
  46                 $params = $this->extractRequestParams();
  47                 $this->addFields(array (
  48                         'll_from',
  49                         'll_lang',
  50                         'll_title'
  51                 ));
  52
  53                 $this->addTables('langlinks');
  54                 $this->addWhereFld('ll_from', array_keys($this->getPageSet()->getGoodTitles()));
  55                 if(!is_null($params['continue'])) {
  56                         $cont = explode('|', $params['continue']);
  57                         if(count($cont) != 2)
  58                                 $this->dieUsage("Invalid continue param. You should pass the " .
  59                                         "original value returned by the previous query", "_badcontinue");
  60                         $llfrom = intval($cont[0]);
  61                         $lllang = $this->getDb()->strencode($cont[1]);
  62                         $this->addWhere("ll_from > $llfrom OR ".
  63                                         "(ll_from = $llfrom AND ".
  64                                         "ll_lang >= '$lllang')");
  65                 }
  66                 # Don't order by ll_from if it's constant in the WHERE clause
  67                 if(count($this->getPageSet()->getGoodTitles()) == 1)
  68                         $this->addOption('ORDER BY', 'll_lang');
  69                 else
  70                         $this->addOption('ORDER BY', 'll_from, ll_lang');
  71                 $this->addOption('LIMIT', $params['limit'] + 1);
  72                 $res = $this->select(__METHOD__);
  73
  74                 $data = array();
  75                 $lastId = 0;    // database has no ID 0
  76                 $count = 0;
  77                 $db = $this->getDB();
  78                 while ($row = $db->fetchObject($res)) {
  79                         if (++$count > $params['limit']) {
  80                                 // We've reached the one extra which shows that
  81                                 // there are additional pages to be had. Stop here...
  82                                 $this->setContinueEnumParameter('continue', "{$row->ll_from}|{$row->ll_lang}");
  83                                 break;
  84                         }
  85                         if ($lastId != $row->ll_from) {
  86                                 if($lastId != 0) {
  87                                         $this->addPageSubItems($lastId, $data);
  88                                         $data = array();
  89                                 }
  90                                 $lastId = $row->ll_from;
  91                         }
  92
  93                         $entry = array('lang' => $row->ll_lang);
  94                         ApiResult :: setContent($entry, $row->ll_title);
  95                         $data[] = $entry;
  96                 }
  97
  98                 if($lastId != 0) {
  99                         $this->addPageSubItems($lastId, $data);
 100                 }
 101
 102                 $db->freeResult($res);
 103         }
 104
 105         public function getAllowedParams() {
 106                 return array(
 107                                 'limit' => array(
 108                                         ApiBase :: PARAM_DFLT => 10,
 109                                         ApiBase :: PARAM_TYPE => 'limit',
 110                                         ApiBase :: PARAM_MIN => 1,
 111                                         ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 112                                         ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 113                                 ),
 114                                 'continue' => null,
 115                 );
 116         }
 117
 118         public function getParamDescription () {
 119                 return array(
 120                         'limit' => 'How many langlinks to return',
 121                         'continue' => 'When more results are available, use this to continue',
 122                 );
 123         }
 124
 125         public function getDescription() {
 126                 return 'Returns all interlanguage links from the given page(s)';
 127         }
 128
 129         protected function getExamples() {
 130                 return array (
 131                                 "Get interlanguage links from the [[Main Page]]:",
 132                                 "  api.php?action=query&prop=langlinks&titles=Main%20Page&redirects",
 133                         );
 134         }
 135
 136         public function getVersion() {
 137                 return __CLASS__ . ': $Id$';
 138         }
 139 }