includes/api/ApiQueryLangLinks.php

   1 <?php
   2
   3 /**
   4  * Created on May 13, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright © 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  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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
  47                 $params = $this->extractRequestParams();
  48                 $this->addFields( array(
  49                         'll_from',
  50                         'll_lang',
  51                         'll_title'
  52                 ) );
  53
  54                 $this->addTables( 'langlinks' );
  55                 $this->addWhereFld( 'll_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  56                 if ( !is_null( $params['continue'] ) ) {
  57                         $cont = explode( '|', $params['continue'] );
  58                         if ( count( $cont ) != 2 ) {
  59                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  60                                         'original value returned by the previous query', '_badcontinue' );
  61                         }
  62                         $llfrom = intval( $cont[0] );
  63                         $lllang = $this->getDB()->strencode( $cont[1] );
  64                         $this->addWhere(
  65                                 "ll_from > $llfrom OR " .
  66                                 "(ll_from = $llfrom AND " .
  67                                 "ll_lang >= '$lllang')"
  68                         );
  69                 }
  70
  71                 // Don't order by ll_from if it's constant in the WHERE clause
  72                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  73                         $this->addOption( 'ORDER BY', 'll_lang' );
  74                 } else {
  75                         $this->addOption( 'ORDER BY', 'll_from, ll_lang' );
  76                 }
  77                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  78                 $res = $this->select( __METHOD__ );
  79
  80                 $count = 0;
  81                 $db = $this->getDB();
  82                 foreach ( $res as $row ) {
  83                         if ( ++$count > $params['limit'] ) {
  84                                 // We've reached the one extra which shows that
  85                                 // there are additional pages to be had. Stop here...
  86                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
  87                                 break;
  88                         }
  89                         $entry = array( 'lang' => $row->ll_lang );
  90                         ApiResult::setContent( $entry, $row->ll_title );
  91                         $fit = $this->addPageSubItem( $row->ll_from, $entry );
  92                         if ( !$fit ) {
  93                                 $this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
  94                                 break;
  95                         }
  96                 }
  97         }
  98
  99         public function getAllowedParams() {
 100                 return array(
 101                         'limit' => array(
 102                                 ApiBase::PARAM_DFLT => 10,
 103                                 ApiBase::PARAM_TYPE => 'limit',
 104                                 ApiBase::PARAM_MIN => 1,
 105                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 106                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 107                         ),
 108                         'continue' => null,
 109                 );
 110         }
 111
 112         public function getParamDescription() {
 113                 return array(
 114                         'limit' => 'How many langlinks to return',
 115                         'continue' => 'When more results are available, use this to continue',
 116                 );
 117         }
 118
 119         public function getDescription() {
 120                 return 'Returns all interlanguage links from the given page(s)';
 121         }
 122
 123         public function getPossibleErrors() {
 124                 return array_merge( parent::getPossibleErrors(), array(
 125                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 126                 ) );
 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 }