includes/api/ApiQueryImages.php

   1 <?php
   2 /**
   3  *
   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 /**
  28  * This query adds an <images> subelement to all pages with the list of images embedded into those pages.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryImages extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'im' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function executeGenerator( $resultPageSet ) {
  43                 $this->run( $resultPageSet );
  44         }
  45
  46         /**
  47          * @param $resultPageSet ApiPageSet
  48          */
  49         private function run( $resultPageSet = null ) {
  50                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  51                         return; // nothing to do
  52                 }
  53
  54                 $params = $this->extractRequestParams();
  55                 $this->addFields( array(
  56                         'il_from',
  57                         'il_to'
  58                 ) );
  59
  60                 $this->addTables( 'imagelinks' );
  61                 $this->addWhereFld( 'il_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  62                 if ( !is_null( $params['continue'] ) ) {
  63                         $cont = explode( '|', $params['continue'] );
  64                         if ( count( $cont ) != 2 ) {
  65                                 $this->dieUsage( 'Invalid continue param. You should pass the ' .
  66                                         'original value returned by the previous query', '_badcontinue' );
  67                         }
  68                         $ilfrom = intval( $cont[0] );
  69                         $ilto = $this->getDB()->strencode( $this->titleToKey( $cont[1] ) );
  70                         $this->addWhere(
  71                                 "il_from > $ilfrom OR " .
  72                                 "(il_from = $ilfrom AND " .
  73                                 "il_to >= '$ilto')"
  74                         );
  75                 }
  76
  77                 $dir = ( $params['dir'] == 'descending' ? ' DESC' : '' );
  78                 // Don't order by il_from if it's constant in the WHERE clause
  79                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
  80                         $this->addOption( 'ORDER BY', 'il_to' . $dir );
  81                 } else {
  82                         $this->addOption( 'ORDER BY', array(
  83                                                 'il_from' . $dir,
  84                                                 'il_to' . $dir
  85                         ));
  86                 }
  87                 $this->addOption( 'LIMIT', $params['limit'] + 1 );
  88
  89                 if ( !is_null( $params['images'] ) ) {
  90                         $images = array();
  91                         foreach ( $params['images'] as $img ) {
  92                                 $title = Title::newFromText( $img );
  93                                 if ( !$title || $title->getNamespace() != NS_FILE ) {
  94                                         $this->setWarning( "``$img'' is not a file" );
  95                                 } else {
  96                                         $images[] = $title->getDBkey();
  97                                 }
  98                         }
  99                         $this->addWhereFld( 'il_to', $images );
 100                 }
 101
 102                 $res = $this->select( __METHOD__ );
 103
 104                 if ( is_null( $resultPageSet ) ) {
 105                         $count = 0;
 106                         foreach ( $res as $row ) {
 107                                 if ( ++$count > $params['limit'] ) {
 108                                         // We've reached the one extra which shows that
 109                                         // there are additional pages to be had. Stop here...
 110                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 111                                                         '|' . $this->keyToTitle( $row->il_to ) );
 112                                         break;
 113                                 }
 114                                 $vals = array();
 115                                 ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( NS_FILE, $row->il_to ) );
 116                                 $fit = $this->addPageSubItem( $row->il_from, $vals );
 117                                 if ( !$fit ) {
 118                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 119                                                         '|' . $this->keyToTitle( $row->il_to ) );
 120                                         break;
 121                                 }
 122                         }
 123                 } else {
 124                         $titles = array();
 125                         $count = 0;
 126                         foreach ( $res as $row ) {
 127                                 if ( ++$count > $params['limit'] ) {
 128                                         // We've reached the one extra which shows that
 129                                         // there are additional pages to be had. Stop here...
 130                                         $this->setContinueEnumParameter( 'continue', $row->il_from .
 131                                                         '|' . $this->keyToTitle( $row->il_to ) );
 132                                         break;
 133                                 }
 134                                 $titles[] = Title::makeTitle( NS_FILE, $row->il_to );
 135                         }
 136                         $resultPageSet->populateFromTitles( $titles );
 137                 }
 138         }
 139
 140         public function getCacheMode( $params ) {
 141                 return 'public';
 142         }
 143
 144         public function getAllowedParams() {
 145                 return array(
 146                         'limit' => array(
 147                                 ApiBase::PARAM_DFLT => 10,
 148                                 ApiBase::PARAM_TYPE => 'limit',
 149                                 ApiBase::PARAM_MIN => 1,
 150                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 151                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 152                         ),
 153                         'continue' => null,
 154                         'images' => array(
 155                                 ApiBase::PARAM_ISMULTI => true,
 156                         ),
 157                         'dir' => array(
 158                                 ApiBase::PARAM_DFLT => 'ascending',
 159                                 ApiBase::PARAM_TYPE => array(
 160                                         'ascending',
 161                                         'descending'
 162                                 )
 163                         ),
 164                 );
 165         }
 166
 167         public function getParamDescription() {
 168                 return array(
 169                         'limit' => 'How many images to return',
 170                         'continue' => 'When more results are available, use this to continue',
 171                         'images' => 'Only list these images. Useful for checking whether a certain page has a certain Image.',
 172                         'dir' => 'The direction in which to list',
 173                 );
 174         }
 175
 176         public function getDescription() {
 177                 return 'Returns all images contained on the given page(s)';
 178         }
 179
 180         public function getPossibleErrors() {
 181                 return array_merge( parent::getPossibleErrors(), array(
 182                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 183                 ) );
 184         }
 185
 186         public function getExamples() {
 187                 return array(
 188                         'Get a list of images used in the [[Main Page]]:',
 189                         '  api.php?action=query&prop=images&titles=Main%20Page',
 190                         'Get information about all images used in the [[Main Page]]:',
 191                         '  api.php?action=query&generator=images&titles=Main%20Page&prop=info'
 192                 );
 193         }
 194
 195         public function getHelpUrls() {
 196                 return 'http://www.mediawiki.org/wiki/API:Properties#images_.2F_im';
 197         }
 198
 199         public function getVersion() {
 200                 return __CLASS__ . ': $Id$';
 201         }
 202 }