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                         $clfrom = intval( $cont[0] );
  93                         $clto = $this->getDB()->strencode( $this->titleToKey( $cont[1] ) );
  94                         $this->addWhere(
  95                                 "cl_from > $clfrom OR " .
  96                                 "(cl_from = $clfrom AND " .
  97                                 "cl_to >= '$clto')"
  98                         );
  99                 }
 100
 101                 if ( isset( $show['hidden'] ) && isset( $show['!hidden'] ) ) {
 102                         $this->dieUsageMsg( 'show' );
 103                 }
 104                 if ( isset( $show['hidden'] ) || isset( $show['!hidden'] ) || isset( $prop['hidden'] ) )
 105                 {
 106                         $this->addOption( 'STRAIGHT_JOIN' );
 107                         $this->addTables( array( 'page', 'page_props' ) );
 108                         $this->addFieldsIf( 'pp_propname', isset( $prop['hidden'] ) );
 109                         $this->addJoinConds( array(
 110                                 'page' => array( 'LEFT JOIN', array(
 111                                         'page_namespace' => NS_CATEGORY,
 112                                         'page_title = cl_to' ) ),
 113                                 'page_props' => array( 'LEFT JOIN', array(
 114                                         'pp_page=page_id',
 115                                         'pp_propname' => 'hiddencat' ) )
 116                         ) );
 117                         if ( isset( $show['hidden'] ) ) {
 118                                 $this->addWhere( array( 'pp_propname IS NOT NULL' ) );
 119                         } elseif ( isset( $show['!hidden'] ) ) {
 120                                 $this->addWhere( array( 'pp_propname IS NULL' ) );
 121                         }
 122                 }
 123
 124                 $this->addOption( 'USE INDEX', array( 'categorylinks' => 'cl_from' ) );
 125
 126                 $dir = ( $params['dir'] == 'descending' ? ' DESC' : '' );
 127                 // Don't order by cl_from if it's constant in the WHERE clause
 128                 if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
 129                         $this->addOption( 'ORDER BY', 'cl_to' . $dir );
 130                 } else {
 131                         $this->addOption( 'ORDER BY', array(
 132                                                 'cl_from' . $dir,
 133                                                 'cl_to' . $dir
 134                         ));
 135                 }
 136
 137                 $res = $this->select( __METHOD__ );
 138
 139                 $count = 0;
 140                 if ( is_null( $resultPageSet ) ) {
 141                         foreach ( $res as $row ) {
 142                                 if ( ++$count > $params['limit'] ) {
 143                                         // We've reached the one extra which shows that
 144                                         // there are additional pages to be had. Stop here...
 145                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 146                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 147                                         break;
 148                                 }
 149
 150                                 $title = Title::makeTitle( NS_CATEGORY, $row->cl_to );
 151                                 $vals = array();
 152                                 ApiQueryBase::addTitleInfo( $vals, $title );
 153                                 if ( isset( $prop['sortkey'] ) ) {
 154                                         $vals['sortkey'] = bin2hex( $row->cl_sortkey );
 155                                         $vals['sortkeyprefix'] = $row->cl_sortkey_prefix;
 156                                 }
 157                                 if ( isset( $prop['timestamp'] ) ) {
 158                                         $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
 159                                 }
 160                                 if ( isset( $prop['hidden'] ) && !is_null( $row->pp_propname ) ) {
 161                                         $vals['hidden'] = '';
 162                                 }
 163
 164                                 $fit = $this->addPageSubItem( $row->cl_from, $vals );
 165                                 if ( !$fit ) {
 166                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 167                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 168                                         break;
 169                                 }
 170                         }
 171                 } else {
 172                         $titles = array();
 173                         foreach ( $res as $row ) {
 174                                 if ( ++$count > $params['limit'] ) {
 175                                         // We've reached the one extra which shows that
 176                                         // there are additional pages to be had. Stop here...
 177                                         $this->setContinueEnumParameter( 'continue', $row->cl_from .
 178                                                         '|' . $this->keyToTitle( $row->cl_to ) );
 179                                         break;
 180                                 }
 181
 182                                 $titles[] = Title :: makeTitle( NS_CATEGORY, $row->cl_to );
 183                         }
 184                         $resultPageSet->populateFromTitles( $titles );
 185                 }
 186         }
 187
 188         public function getAllowedParams() {
 189                 return array(
 190                         'prop' => array(
 191                                 ApiBase::PARAM_ISMULTI => true,
 192                                 ApiBase::PARAM_TYPE => array (
 193                                         'sortkey',
 194                                         'timestamp',
 195                                         'hidden',
 196                                 )
 197                         ),
 198                         'show' => array(
 199                                 ApiBase::PARAM_ISMULTI => true,
 200                                 ApiBase::PARAM_TYPE => array(
 201                                         'hidden',
 202                                         '!hidden',
 203                                 )
 204                         ),
 205                         'limit' => array(
 206                                 ApiBase::PARAM_DFLT => 10,
 207                                 ApiBase::PARAM_TYPE => 'limit',
 208                                 ApiBase::PARAM_MIN => 1,
 209                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 210                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 211                         ),
 212                         'continue' => null,
 213                         'categories' => array(
 214                                 ApiBase::PARAM_ISMULTI => true,
 215                         ),
 216                         'dir' => array(
 217                                 ApiBase::PARAM_DFLT => 'ascending',
 218                                 ApiBase::PARAM_TYPE => array(
 219                                         'ascending',
 220                                         'descending'
 221                                 )
 222                         ),
 223                 );
 224         }
 225
 226         public function getParamDescription() {
 227                 return array(
 228                         'prop' => array(
 229                                 'Which additional properties to get for each category',
 230                                 ' sortkey    - Adds the sortkey (hexadecimal string) and sortkey prefix (human-readable part) for the category',
 231                                 ' timestamp  - Adds timestamp of when the category was added',
 232                                 ' hidden     - Tags categories that are hidden with __HIDDENCAT__',
 233                         ),
 234                         'limit' => 'How many categories to return',
 235                         'show' => 'Which kind of categories to show',
 236                         'continue' => 'When more results are available, use this to continue',
 237                         'categories' => 'Only list these categories. Useful for checking whether a certain page is in a certain category',
 238                         'dir' => 'The direction in which to list',
 239                 );
 240         }
 241
 242         public function getDescription() {
 243                 return 'List all categories the page(s) belong to';
 244         }
 245
 246         public function getPossibleErrors() {
 247                 return array_merge( parent::getPossibleErrors(), array(
 248                         array( 'show' ),
 249                 ) );
 250         }
 251
 252         public function getExamples() {
 253                 return array(
 254                         'Get a list of categories [[Albert Einstein]] belongs to:',
 255                         '  api.php?action=query&prop=categories&titles=Albert%20Einstein',
 256                         'Get information about all categories used in the [[Albert Einstein]]:',
 257                         '  api.php?action=query&generator=categories&titles=Albert%20Einstein&prop=info'
 258                 );
 259         }
 260
 261         public function getHelpUrls() {
 262                 return 'http://www.mediawiki.org/wiki/API:Properties#categories_.2F_cl';
 263         }
 264
 265         public function getVersion() {
 266                 return __CLASS__ . ': $Id$';
 267         }
 268 }