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 /**
  28  * A query module to enumerate categories the set of pages belong to.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryCategories extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'cl' );
  36         }
  37
  38         public function execute() {
  39                 $this->run();
  40         }
  41
  42         public function getCacheMode( $params ) {
  43                 return 'public';
  44         }
  45
  46         public function executeGenerator( $resultPageSet ) {
  47                 $this->run( $resultPageSet );
  48         }
  49
  50         /**
  51          * @param $resultPageSet ApiPageSet
  52          * @return
  53          */
  54         private function run( $resultPageSet = null ) {
  55                 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
  56                         return; // nothing to do
  57                 }
  58
  59                 $params = $this->extractRequestParams();
  60                 $prop = array_flip( (array)$params['prop'] );
  61                 $show = array_flip( (array)$params['show'] );
  62
  63                 $this->addFields( array(
  64                         'cl_from',
  65                         'cl_to'
  66                 ) );
  67
  68                 $this->addFieldsIf( array( 'cl_sortkey', 'cl_sortkey_prefix' ), isset( $prop['sortkey'] ) );
  69                 $this->addFieldsIf( 'cl_timestamp', isset( $prop['timestamp'] ) );
  70
  71                 $this->addTables( 'categorylinks' );
  72                 $this->addWhereFld( 'cl_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
  73                 if ( !is_null( $params['categories'] ) ) {
  74                         $cats = array();
  75                         foreach ( $params['categories'] as $cat ) {
  76                                 $title = Title::newFromText( $cat );
  77                                 if ( !$title || $title->getNamespace() != NS_CATEGORY ) {
  78                                         $this->setWarning( "\"$cat\" is not a category" );
  79                                 } else {
  80                                         $cats[] = $title->getDBkey();
  81                                 }
  82                         }
  83                         $this->addWhereFld( 'cl_to', $cats );
  84                 }
  85
  86                 if ( !is_null( $params['continue'] ) ) {
  87                         $cont = explode( '|', $params['continue'] );
  88                         if ( count( $cont ) != 2 ) {
  89                                 $this->dieUsage( "Invalid continue param. You should pass the " .
  90                                         "original value returned by the previous query", "_badcontinue" );
  91                         }
  92                         $op = $params['dir'] == 'descending' ? '<' : '>';
  93                         $clfrom = intval( $cont[0] );
  94                         $clto = $this->getDB()->addQuotes( $this->titleToKey( $cont[1] ) );
  95                         $this->addWhere(
  96                                 "cl_from $op $clfrom OR " .
  97                                 "(cl_from = $clfrom AND " .
  98                                 "cl_to $op= $clto)"
  99                         );
 100                 }
 101
 102                 if ( isset( $show['hidden'] ) && isset( $show['!hidden'] ) ) {
 103                         $this->dieUsageMsg( '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
 127                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
 128                 // Don't order by cl_from if it's constant in the WHERE clause
 129                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
 130                         $this->addOption( 'ORDER BY', 'cl_to' . $sort );
 131                 } else {
 132                         $this->addOption( 'ORDER BY', array(
 133                                                 'cl_from' . $sort,
 134                                                 'cl_to' . $sort
 135                         ));
 136                 }
 137
 138                 $res = $this->select( __METHOD__ );
 139
 140                 $count = 0;
 141                 if ( is_null( $resultPageSet ) ) {
 142                         foreach ( $res as $row ) {
 143                                 if ( ++$count > $params['limit'] ) {
 144                                         // We've reached the one extra which shows that
 145                                         // there are additional pages to be had. Stop here...
 146                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 147                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 148                                         break;
 149                                 }
 150
 151                                 $title = Title::makeTitle( NS_CATEGORY, $row->cl_to );
 152                                 $vals = array();
 153                                 ApiQueryBase::addTitleInfo( $vals, $title );
 154                                 if ( isset( $prop['sortkey'] ) ) {
 155                                         $vals['sortkey'] = bin2hex( $row->cl_sortkey );
 156                                         $vals['sortkeyprefix'] = $row->cl_sortkey_prefix;
 157                                 }
 158                                 if ( isset( $prop['timestamp'] ) ) {
 159                                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
 160                                 }
 161                                 if ( isset( $prop['hidden'] ) && !is_null( $row->pp_propname ) ) {
 162                                         $vals['hidden'] = '';
 163                                 }
 164
 165                                 $fit = $this->addPageSubItem( $row->cl_from, $vals );
 166                                 if ( !$fit ) {
 167                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 168                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 169                                         break;
 170                                 }
 171                         }
 172                 } else {
 173                         $titles = array();
 174                         foreach ( $res as $row ) {
 175                                 if ( ++$count > $params['limit'] ) {
 176                                         // We've reached the one extra which shows that
 177                                         // there are additional pages to be had. Stop here...
 178                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 179                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 180                                         break;
 181                                 }
 182
 183                                 $titles[] = Title :: makeTitle( NS_CATEGORY, $row->cl_to );
 184                         }
 185                         $resultPageSet->populateFromTitles( $titles );
 186                 }
 187         }
 188
 189         public function getAllowedParams() {
 190                 return array(
 191                         'prop' => array(
 192                                 ApiBase::PARAM_ISMULTI => true,
 193                                 ApiBase::PARAM_TYPE => array (
 194                                         'sortkey',
 195                                         'timestamp',
 196                                         'hidden',
 197                                 )
 198                         ),
 199                         'show' => array(
 200                                 ApiBase::PARAM_ISMULTI => true,
 201                                 ApiBase::PARAM_TYPE => array(
 202                                         'hidden',
 203                                         '!hidden',
 204                                 )
 205                         ),
 206                         'limit' => array(
 207                                 ApiBase::PARAM_DFLT => 10,
 208                                 ApiBase::PARAM_TYPE => 'limit',
 209                                 ApiBase::PARAM_MIN => 1,
 210                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 211                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 212                         ),
 213                         'continue' => null,
 214                         'categories' => array(
 215                                 ApiBase::PARAM_ISMULTI => true,
 216                         ),
 217                         'dir' => array(
 218                                 ApiBase::PARAM_DFLT => 'ascending',
 219                                 ApiBase::PARAM_TYPE => array(
 220                                         'ascending',
 221                                         'descending'
 222                                 )
 223                         ),
 224                 );
 225         }
 226
 227         public function getParamDescription() {
 228                 return array(
 229                         'prop' => array(
 230                                 'Which additional properties to get for each category',
 231                                 ' sortkey    - Adds the sortkey (hexadecimal string) and sortkey prefix (human-readable part) for the category',
 232                                 ' timestamp  - Adds timestamp of when the category was added',
 233                                 ' hidden     - Tags categories that are hidden with __HIDDENCAT__',
 234                         ),
 235                         'limit' => 'How many categories to return',
 236                         'show' => 'Which kind of categories to show',
 237                         'continue' => 'When more results are available, use this to continue',
 238                         'categories' => 'Only list these categories. Useful for checking whether a certain page is in a certain category',
 239                         'dir' => 'The direction in which to list',
 240                 );
 241         }
 242
 243         public function getDescription() {
 244                 return 'List all categories the page(s) belong to';
 245         }
 246
 247         public function getPossibleErrors() {
 248                 return array_merge( parent::getPossibleErrors(), array(
 249                         array( 'show' ),
 250                 ) );
 251         }
 252
 253         public function getExamples() {
 254                 return array(
 255                         'api.php?action=query&prop=categories&titles=Albert%20Einstein' => 'Get a list of categories [[Albert Einstein]] belongs to',
 256                         'api.php?action=query&generator=categories&titles=Albert%20Einstein&prop=info' => 'Get information about all categories used in the [[Albert Einstein]]',
 257                 );
 258         }
 259
 260         public function getHelpUrls() {
 261                 return 'https://www.mediawiki.org/wiki/API:Properties#categories_.2F_cl';
 262         }
 263
 264         public function getVersion() {
 265                 return __CLASS__ . ': $Id$';
 266         }
 267 }