includes/api/ApiQueryPagePropNames.php

   1 <?php
   2 /**
   3  * Created on January 21, 2013
   4  *
   5  * Copyright © 2013 Brad Jorsch <bjorsch@wikimedia.org>
   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  * @author Brad Jorsch
  25  */
  26
  27 /**
  28  * A query module to list used page props
  29  *
  30  * @ingroup API
  31  * @since 1.21
  32  */
  33 class ApiQueryPagePropNames extends ApiQueryBase {
  34
  35         public function __construct( ApiQuery $query, $moduleName ) {
  36                 parent::__construct( $query, $moduleName, 'ppn' );
  37         }
  38
  39         public function getCacheMode( $params ) {
  40                 return 'public';
  41         }
  42
  43         public function execute() {
  44                 $params = $this->extractRequestParams();
  45
  46                 $this->addTables( 'page_props' );
  47                 $this->addFields( 'pp_propname' );
  48                 $this->addOption( 'DISTINCT' );
  49                 $this->addOption( 'ORDER BY', 'pp_propname' );
  50
  51                 if ( $params['continue'] ) {
  52                         $cont = explode( '|', $params['continue'] );
  53                         $this->dieContinueUsageIf( count( $cont ) != 1 );
  54
  55                         // Add a WHERE clause
  56                         $this->addWhereRange( 'pp_propname', 'newer', $cont[0], null );
  57                 }
  58
  59                 $limit = $params['limit'];
  60
  61                 // mysql has issues with limit in loose index T115825
  62                 if ( $this->getDB()->getType() !== 'mysql' ) {
  63                         $this->addOption( 'LIMIT', $limit + 1 );
  64                 }
  65
  66                 $result = $this->getResult();
  67                 $count = 0;
  68                 foreach ( $this->select( __METHOD__ ) as $row ) {
  69                         if ( ++$count > $limit ) {
  70                                 // We've reached the one extra which shows that there are
  71                                 // additional pages to be had. Stop here...
  72                                 $this->setContinueEnumParameter( 'continue', $row->pp_propname );
  73                                 break;
  74                         }
  75
  76                         $vals = [];
  77                         $vals['propname'] = $row->pp_propname;
  78                         $fit = $result->addValue( [ 'query', $this->getModuleName() ], null, $vals );
  79                         if ( !$fit ) {
  80                                 $this->setContinueEnumParameter( 'continue', $row->pp_propname );
  81                                 break;
  82                         }
  83                 }
  84
  85                 $result->addIndexedTagName( [ 'query', $this->getModuleName() ], 'p' );
  86         }
  87
  88         public function getAllowedParams() {
  89                 return [
  90                         'continue' => [
  91                                 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
  92                         ],
  93                         'limit' => [
  94                                 ApiBase::PARAM_TYPE => 'limit',
  95                                 ApiBase::PARAM_DFLT => 10,
  96                                 ApiBase::PARAM_MIN => 1,
  97                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
  98                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
  99                         ],
 100                 ];
 101         }
 102
 103         protected function getExamplesMessages() {
 104                 return [
 105                         'action=query&list=pagepropnames'
 106                                 => 'apihelp-query+pagepropnames-example-simple',
 107                 ];
 108         }
 109
 110         public function getHelpUrls() {
 111                 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Pagepropnames';
 112         }
 113 }