includes/api/ApiQueryImages.php

   1 <?php
   2 /**
   3  * API for MediaWiki 1.8+
   4  *
   5  * Created on May 13, 2007
   6  *
   7  * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( "ApiQueryBase.php" );
  30 }
  31
  32 /**
  33  * This query adds an <images> subelement to all pages with the list of images embedded into those pages.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryImages extends ApiQueryGeneratorBase {
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'im' );
  41         }
  42
  43         public function execute() {
  44                 $this->run();
  45         }
  46
  47         public function executeGenerator( $resultPageSet ) {
  48                 $this->run( $resultPageSet );
  49         }
  50
  51         private function run( $resultPageSet = null ) {
  52                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  53                         return; // nothing to do
  54                 }
  55
  56                 $params = $this->extractRequestParams();
  57                 $this->addFields( array(
  58                         'il_from',
  59                         'il_to'
  60                 ) );
  61
  62                 $this->addTables( 'imagelinks' );
  63                 $this->addWhereFld( 'il_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  64                 if ( !is_null( $params['continue'] ) ) {
  65                         $cont = explode( '|', $params['continue'] );
  66                         if ( count( $cont ) != 2 ) {
  67                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  68                                         'original value returned by the previous query', '_badcontinue' );
  69                         }
  70                         $ilfrom = intval( $cont[0] );
  71                         $ilto = $this->getDB()->strencode( $this->titleToKey( $cont[1] ) );
  72                         $this->addWhere(
  73                                 "il_from > $ilfrom OR " .
  74                                 "(il_from = $ilfrom AND " .
  75                                 "il_to >= '$ilto')"
  76                         );
  77                 }
  78
  79                 // Don't order by il_from if it's constant in the WHERE clause
  80                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  81                         $this->addOption( 'ORDER BY', 'il_to' );
  82                 } else {
  83                         $this->addOption( 'ORDER BY', 'il_from, il_to' );
  84                 }
  85                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  86
  87                 $res = $this->select( __METHOD__ );
  88
  89                 if ( is_null( $resultPageSet ) ) {
  90                         $count = 0;
  91                         foreach ( $res as $row ) {
  92                                 if ( ++$count > $params['limit'] ) {
  93                                         // We've reached the one extra which shows that
  94                                         // there are additional pages to be had. Stop here...
  95                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
  96                                                         '|' . $this->keyToTitle( $row->il_to ) );
  97                                         break;
  98                                 }
  99                                 $vals = array();
 100                                 ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
 101                                 $fit = $this->addPageSubItem( $row->il_from, $vals );
 102                                 if ( !$fit ) {
 103                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 104                                                         '|' . $this->keyToTitle( $row->il_to ) );
 105                                         break;
 106                                 }
 107                         }
 108                 } else {
 109                         $titles = array();
 110                         $count = 0;
 111                         foreach ( $res as $row ) {
 112                                 if ( ++$count > $params['limit'] ) {
 113                                         // We've reached the one extra which shows that
 114                                         // there are additional pages to be had. Stop here...
 115                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 116                                                         '|' . $this->keyToTitle( $row->il_to ) );
 117                                         break;
 118                                 }
 119                                 $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
 120                         }
 121                         $resultPageSet->populateFromTitles( $titles );
 122                 }
 123         }
 124
 125         public function getCacheMode( $params ) {
 126                 return 'public';
 127         }
 128
 129         public function getAllowedParams() {
 130                 return array(
 131                         'limit' => array(
 132                                 ApiBase::PARAM_DFLT => 10,
 133                                 ApiBase::PARAM_TYPE => 'limit',
 134                                 ApiBase::PARAM_MIN => 1,
 135                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 136                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 137                         ),
 138                         'continue' => null,
 139                 );
 140         }
 141
 142         public function getParamDescription() {
 143                 return array(
 144                         'limit' => 'How many images to return',
 145                         'continue' => 'When more results are available, use this to continue',
 146                 );
 147         }
 148
 149         public function getDescription() {
 150                 return 'Returns all images contained on the given page(s)';
 151         }
 152
 153         public function getPossibleErrors() {
 154                 return array_merge( parent::getPossibleErrors(), array(
 155                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 156                 ) );
 157         }
 158
 159         protected function getExamples() {
 160                 return array(
 161                         'Get a list of images used in the [[Main Page]]:',
 162                         '  api.php?action=query&prop=images&titles=Main%20Page',
 163                         'Get information about all images used in the [[Main Page]]:',
 164                         '  api.php?action=query&generator=images&titles=Main%20Page&prop=info'
 165                 );
 166         }
 167
 168         public function getVersion() {
 169                 return __CLASS__ . ': $Id$';
 170         }
 171 }