includes/api/ApiQueryPagePropNames.php

   1 <?php
   2 /**
   3  * Created on January 21, 2013
   4  *
   5  * Copyright © 2013 Wikimedia Foundation and contributors
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  * http://www.gnu.org/copyleft/gpl.html
  21  *
  22  * @file
  23  * @since 1.21
  24  */
  25
  26 /**
  27  * A query module to list used page props
  28  *
  29  * @ingroup API
  30  * @since 1.21
  31  */
  32 class ApiQueryPagePropNames extends ApiQueryBase {
  33
  34         public function __construct( ApiQuery $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'ppn' );
  36         }
  37
  38         public function getCacheMode( $params ) {
  39                 return 'public';
  40         }
  41
  42         public function execute() {
  43                 $params = $this->extractRequestParams();
  44
  45                 $this->addTables( 'page_props' );
  46                 $this->addFields( 'pp_propname' );
  47                 $this->addOption( 'DISTINCT' );
  48                 $this->addOption( 'ORDER BY', 'pp_propname' );
  49
  50                 if ( $params['continue'] ) {
  51                         $cont = explode( '|', $params['continue'] );
  52                         $this->dieContinueUsageIf( count( $cont ) != 1 );
  53
  54                         // Add a WHERE clause
  55                         $this->addWhereRange( 'pp_propname', 'newer', $cont[0], null );
  56                 }
  57
  58                 $limit = $params['limit'];
  59
  60                 // mysql has issues with limit in loose index T115825
  61                 if ( $this->getDB()->getType() !== 'mysql' ) {
  62                         $this->addOption( 'LIMIT', $limit + 1 );
  63                 }
  64
  65                 $result = $this->getResult();
  66                 $count = 0;
  67                 foreach ( $this->select( __METHOD__ ) as $row ) {
  68                         if ( ++$count > $limit ) {
  69                                 // We've reached the one extra which shows that there are
  70                                 // additional pages to be had. Stop here...
  71                                 $this->setContinueEnumParameter( 'continue', $row->pp_propname );
  72                                 break;
  73                         }
  74
  75                         $vals = [];
  76                         $vals['propname'] = $row->pp_propname;
  77                         $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
  78                         if ( !$fit ) {
  79                                 $this->setContinueEnumParameter( 'continue', $row->pp_propname );
  80                                 break;
  81                         }
  82                 }
  83
  84                 $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'p' );
  85         }
  86
  87         public function getAllowedParams() {
  88                 return [
  89                         'continue' => [
  90                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
  91                         ],
  92                         'limit' => [
  93                                 ApiBase::PARAM_TYPE => 'limit',
  94                                 ApiBase::PARAM_DFLT => 10,
  95                                 ApiBase::PARAM_MIN => 1,
  96                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
  97                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
  98                         ],
  99                 ];
 100         }
 101
 102         protected function getExamplesMessages() {
 103                 return [
 104                         'action=query&list=pagepropnames'
 105                                 => 'apihelp-query+pagepropnames-example-simple',
 106                 ];
 107         }
 108
 109         public function getHelpUrls() {
 110                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Pagepropnames';
 111         }
 112 }