includes/api/ApiQueryImages.php

   1 <?php
   2
   3 /*
   4  * Created on May 13, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 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  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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  * This query adds an <images> subelement to all pages with the list of images embedded into those pages.
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQueryImages extends ApiQueryGeneratorBase {
  37
  38         public function __construct($query, $moduleName) {
  39                 parent :: __construct($query, $moduleName, 'im');
  40         }
  41
  42         public function execute() {
  43                 $this->run();
  44         }
  45
  46         public function executeGenerator($resultPageSet) {
  47                 $this->run($resultPageSet);
  48         }
  49
  50         private function run($resultPageSet = null) {
  51
  52                 if ($this->getPageSet()->getGoodTitleCount() == 0)
  53                         return; // nothing to do
  54
  55                 $params = $this->extractRequestParams();
  56                 $this->addFields(array (
  57                         'il_from',
  58                         'il_to'
  59                 ));
  60
  61                 $this->addTables('imagelinks');
  62                 $this->addWhereFld('il_from', array_keys($this->getPageSet()->getGoodTitles()));
  63                 if(!is_null($params['continue'])) {
  64                         $cont = explode('|', $params['continue']);
  65                         if(count($cont) != 2)
  66                                 $this->dieUsage("Invalid continue param. You should pass the " .
  67                                         "original value returned by the previous query", "_badcontinue");
  68                         $ilfrom = intval($cont[0]);
  69                         $ilto = $this->getDB()->strencode($this->titleToKey($cont[1]));
  70                         $this->addWhere("il_from > $ilfrom OR ".
  71                                         "(il_from = $ilfrom AND ".
  72                                         "il_to >= '$ilto')");
  73                 }
  74                 # Don't order by il_from if it's constant in the WHERE clause
  75                 if(count($this->getPageSet()->getGoodTitles()) == 1)
  76                         $this->addOption('ORDER BY', 'il_to');
  77                 else
  78                         $this->addOption('ORDER BY', 'il_from, il_to');
  79                 $this->addOption('LIMIT', $params['limit'] + 1);
  80
  81                 $db = $this->getDB();
  82                 $res = $this->select(__METHOD__);
  83
  84                 if (is_null($resultPageSet)) {
  85
  86                         $data = array();
  87                         $lastId = 0;    // database has no ID 0
  88                         $count = 0;
  89                         while ($row = $db->fetchObject($res)) {
  90                                 if (++$count > $params['limit']) {
  91                                         // We've reached the one extra which shows that
  92                                         // there are additional pages to be had. Stop here...
  93                                         $this->setContinueEnumParameter('continue', $row->il_from .
  94                                                         '|' . $this->keyToTitle($row->il_to));
  95                                         break;
  96                                 }
  97                                 if ($lastId != $row->il_from) {
  98                                         if($lastId != 0) {
  99                                                 $this->addPageSubItems($lastId, $data);
 100                                                 $data = array();
 101                                         }
 102                                         $lastId = $row->il_from;
 103                                 }
 104
 105                                 $vals = array();
 106                                 ApiQueryBase :: addTitleInfo($vals, Title :: makeTitle(NS_FILE, $row->il_to));
 107                                 $data[] = $vals;
 108                         }
 109
 110                         if($lastId != 0) {
 111                                 $this->addPageSubItems($lastId, $data);
 112                         }
 113
 114                 } else {
 115
 116                         $titles = array();
 117                         $count = 0;
 118                         while ($row = $db->fetchObject($res)) {
 119                                 if (++$count > $params['limit']) {
 120                                         // We've reached the one extra which shows that
 121                                         // there are additional pages to be had. Stop here...
 122                                         $this->setContinueEnumParameter('continue', $row->il_from .
 123                                                         '|' . $this->keyToTitle($row->il_to));
 124                                         break;
 125                                 }
 126                                 $titles[] = Title :: makeTitle(NS_FILE, $row->il_to);
 127                         }
 128                         $resultPageSet->populateFromTitles($titles);
 129                 }
 130
 131                 $db->freeResult($res);
 132         }
 133
 134         public function getAllowedParams() {
 135                 return array(
 136                                 'limit' => array(
 137                                         ApiBase :: PARAM_DFLT => 10,
 138                                         ApiBase :: PARAM_TYPE => 'limit',
 139                                         ApiBase :: PARAM_MIN => 1,
 140                                         ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 141                                         ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 142                                 ),
 143                                 'continue' => null,
 144                 );
 145         }
 146
 147         public function getParamDescription () {
 148                 return array(
 149                         'limit' => 'How many images to return',
 150                         'continue' => 'When more results are available, use this to continue',
 151                 );
 152         }
 153
 154         public function getDescription() {
 155                 return 'Returns all images contained on the given page(s)';
 156         }
 157
 158         protected function getExamples() {
 159                 return array (
 160                                 "Get a list of images used in the [[Main Page]]:",
 161                                 "  api.php?action=query&prop=images&titles=Main%20Page",
 162                                 "Get information about all images used in the [[Main Page]]:",
 163                                 "  api.php?action=query&generator=images&titles=Main%20Page&prop=info"
 164                         );
 165         }
 166
 167         public function getVersion() {
 168                 return __CLASS__ . ': $Id$';
 169         }
 170 }