includes/api/ApiQueryCategories.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 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( "ApiQueryBase.php" );
  30 }
  31
  32 /**
  33  * A query module to enumerate categories the set of pages belong to.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryCategories extends ApiQueryGeneratorBase {
  38
  39         public function __construct( $query, $moduleName ) {
  40                 parent::__construct( $query, $moduleName, 'cl' );
  41         }
  42
  43         public function execute() {
  44                 $this->run();
  45         }
  46
  47         public function getCacheMode( $params ) {
  48                 return 'public';
  49         }
  50
  51         public function executeGenerator( $resultPageSet ) {
  52                 $this->run( $resultPageSet );
  53         }
  54
  55         private function run( $resultPageSet = null ) {
  56                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  57                         return; // nothing to do
  58                 }
  59
  60                 $params = $this->extractRequestParams();
  61                 $prop = array_flip( (array)$params['prop'] );
  62                 $show = array_flip( (array)$params['show'] );
  63
  64                 $this->addFields( array(
  65                         'cl_from',
  66                         'cl_to'
  67                 ) );
  68
  69                 $this->addFieldsIf( 'cl_sortkey', isset( $prop['sortkey'] ) );
  70                 $this->addFieldsIf( 'cl_timestamp', isset( $prop['timestamp'] ) );
  71
  72                 $this->addTables( 'categorylinks' );
  73                 $this->addWhereFld( 'cl_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  74                 if ( !is_null( $params['categories'] ) ) {
  75                         $cats = array();
  76                         foreach ( $params['categories'] as $cat ) {
  77                                 $title = Title::newFromText( $cat );
  78                                 if ( !$title || $title->getNamespace() != NS_CATEGORY ) {
  79                                         $this->setWarning( "``$cat'' is not a category" );
  80                                 } else {
  81                                         $cats[] = $title->getDBkey();
  82                                 }
  83                         }
  84                         $this->addWhereFld( 'cl_to', $cats );
  85                 }
  86
  87                 if ( !is_null( $params['continue'] ) ) {
  88                         $cont = explode( '|', $params['continue'] );
  89                         if ( count( $cont ) != 2 ) {
  90                                 $this->dieUsage( "Invalid continue param. You should pass the " .
  91                                         "original value returned by the previous query", "_badcontinue" );
  92                         }
  93                         $clfrom = intval( $cont[0] );
  94                         $clto = $this->getDB()->strencode( $this->titleToKey( $cont[1] ) );
  95                         $this->addWhere(
  96                                 "cl_from > $clfrom OR " .
  97                                 "(cl_from = $clfrom AND " .
  98                                 "cl_to >= '$clto')"
  99                         );
 100                 }
 101
 102                 if ( isset( $show['hidden'] ) && isset( $show['!hidden'] ) ) {
 103                         $this->dieUsageMsg( array( 'show' ) );
 104                 }
 105                 if ( isset( $show['hidden'] ) || isset( $show['!hidden'] ) || isset( $prop['hidden'] ) )
 106                 {
 107                         $this->addOption( 'STRAIGHT_JOIN' );
 108                         $this->addTables( array( 'page', 'page_props' ) );
 109                         $this->addFieldsIf( 'pp_propname', isset( $prop['hidden'] ) );
 110                         $this->addJoinConds( array(
 111                                 'page' => array( 'LEFT JOIN', array(
 112                                         'page_namespace' => NS_CATEGORY,
 113                                         'page_title = cl_to' ) ),
 114                                 'page_props' => array( 'LEFT JOIN', array(
 115                                         'pp_page=page_id',
 116                                         'pp_propname' => 'hiddencat' ) )
 117                         ) );
 118                         if ( isset( $show['hidden'] ) ) {
 119                                 $this->addWhere( array( 'pp_propname IS NOT NULL' ) );
 120                         } elseif ( isset( $show['!hidden'] ) ) {
 121                                 $this->addWhere( array( 'pp_propname IS NULL' ) );
 122                         }
 123                 }
 124
 125                 $this->addOption( 'USE INDEX', array( 'categorylinks' => 'cl_from' ) );
 126                 // Don't order by cl_from if it's constant in the WHERE clause
 127                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
 128                         $this->addOption( 'ORDER BY', 'cl_to' );
 129                 } else {
 130                         $this->addOption( 'ORDER BY', "cl_from, cl_to" );
 131                 }
 132
 133                 $res = $this->select( __METHOD__ );
 134
 135                 if ( is_null( $resultPageSet ) ) {
 136                         $count = 0;
 137                         foreach ( $res as $row ) {
 138                                 if ( ++$count > $params['limit'] ) {
 139                                         // We've reached the one extra which shows that
 140                                         // there are additional pages to be had. Stop here...
 141                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 142                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 143                                         break;
 144                                 }
 145
 146                                 $title = Title::makeTitle( NS_CATEGORY, $row->cl_to );
 147                                 $vals = array();
 148                                 ApiQueryBase::addTitleInfo( $vals, $title );
 149                                 if ( isset( $prop['sortkey'] ) ) {
 150                                         $vals['sortkey'] = $row->cl_sortkey;
 151                                 }
 152                                 if ( isset( $prop['timestamp'] ) ) {
 153                                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
 154                                 }
 155                                 if ( isset( $prop['hidden'] ) && !is_null( $row->pp_propname ) ) {
 156                                         $vals['hidden'] = '';
 157                                 }
 158
 159                                 $fit = $this->addPageSubItem( $row->cl_from, $vals );
 160                                 if ( !$fit ) {
 161                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 162                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 163                                         break;
 164                                 }
 165                         }
 166                 } else {
 167                         $titles = array();
 168                         foreach ( $res as $row ) {
 169                                 if ( ++$count > $params['limit'] ) {
 170                                         // We've reached the one extra which shows that
 171                                         // there are additional pages to be had. Stop here...
 172                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 173                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 174                                         break;
 175                                 }
 176
 177                                 $titles[] = Title :: makeTitle( NS_CATEGORY, $row->cl_to );
 178                         }
 179                         $resultPageSet->populateFromTitles( $titles );
 180                 }
 181         }
 182
 183         public function getAllowedParams() {
 184                 return array(
 185                         'prop' => array(
 186                                 ApiBase::PARAM_ISMULTI => true,
 187                                 ApiBase::PARAM_TYPE => array (
 188                                         'sortkey',
 189                                         'timestamp',
 190                                         'hidden',
 191                                 )
 192                         ),
 193                         'show' => array(
 194                                 ApiBase::PARAM_ISMULTI => true,
 195                                 ApiBase::PARAM_TYPE => array(
 196                                         'hidden',
 197                                         '!hidden',
 198                                 )
 199                         ),
 200                         'limit' => array(
 201                                 ApiBase::PARAM_DFLT => 10,
 202                                 ApiBase::PARAM_TYPE => 'limit',
 203                                 ApiBase::PARAM_MIN => 1,
 204                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 205                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 206                         ),
 207                         'continue' => null,
 208                         'categories' => array(
 209                                 ApiBase::PARAM_ISMULTI => true,
 210                         ),
 211                 );
 212         }
 213
 214         public function getParamDescription() {
 215                 return array(
 216                         'prop' => array(
 217                                 'Which additional properties to get for each category',
 218                                 ' sortkey    - Adds the sortkey for the category',
 219                                 ' timestamp  - Adds timestamp of when the category was added',
 220                                 ' hidden     - Tags categories that are hidden with __HIDDENCAT__',
 221                         ),
 222                         'limit' => 'How many categories to return',
 223                         'show' => 'Which kind of categories to show',
 224                         'continue' => 'When more results are available, use this to continue',
 225                         'categories' => 'Only list these categories. Useful for checking whether a certain page is in a certain category',
 226                 );
 227         }
 228
 229         public function getDescription() {
 230                 return 'List all categories the page(s) belong to';
 231         }
 232
 233         public function getPossibleErrors() {
 234                 return array_merge( parent::getPossibleErrors(), array(
 235                         array( 'show' ),
 236                 ) );
 237         }
 238
 239         protected function getExamples() {
 240                 return array(
 241                         'Get a list of categories [[Albert Einstein]] belongs to:',
 242                         '  api.php?action=query&prop=categories&titles=Albert%20Einstein',
 243                         'Get information about all categories used in the [[Albert Einstein]]:',
 244                         '  api.php?action=query&generator=categories&titles=Albert%20Einstein&prop=info'
 245                 );
 246         }
 247
 248         public function getVersion() {
 249                 return __CLASS__ . ': $Id$';
 250         }
 251 }