includes/api/ApiQueryAllLinks.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on July 7, 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  * Query module to enumerate links from all pages together.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 parent::__construct( $query, $moduleName, 'al' );
  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 void
  53          */
  54         private function run( $resultPageSet = null ) {
  55                 $db = $this->getDB();
  56                 $params = $this->extractRequestParams();
  57
  58                 $prop = array_flip( $params['prop'] );
  59                 $fld_ids = isset( $prop['ids'] );
  60                 $fld_title = isset( $prop['title'] );
  61
  62                 if ( $params['unique'] ) {
  63                         if ( !is_null( $resultPageSet ) ) {
  64                                 $this->dieUsage( $this->getModuleName() . ' cannot be used as a generator in unique links mode', 'params' );
  65                         }
  66                         if ( $fld_ids ) {
  67                                 $this->dieUsage( $this->getModuleName() . ' cannot return corresponding page ids in unique links mode', 'params' );
  68                         }
  69                         $this->addOption( 'DISTINCT' );
  70                 }
  71
  72                 $this->addTables( 'pagelinks' );
  73                 $this->addWhereFld( 'pl_namespace', $params['namespace'] );
  74
  75                 if ( !is_null( $params['from'] ) && !is_null( $params['continue'] ) ) {
  76                         $this->dieUsage( 'alcontinue and alfrom cannot be used together', 'params' );
  77                 }
  78                 if ( !is_null( $params['continue'] ) ) {
  79                         $continueArr = explode( '|', $params['continue'] );
  80                         $op = $params['dir'] == 'descending' ? '<' : '>';
  81                         if ( $params['unique'] ) {
  82                                 if ( count( $continueArr ) != 1 ) {
  83                                         $this->dieUsage( 'Invalid continue parameter', 'badcontinue' );
  84                                 }
  85                                 $continueTitle = $db->addQuotes( $continueArr[0] );
  86                                 $this->addWhere( "pl_title $op= $continueTitle" );
  87                         } else {
  88                                 if ( count( $continueArr ) != 2 ) {
  89                                         $this->dieUsage( 'Invalid continue parameter', 'badcontinue' );
  90                                 }
  91                                 $continueTitle = $db->addQuotes( $continueArr[0] );
  92                                 $continueFrom = intval( $continueArr[1] );
  93                                 $this->addWhere(
  94                                         "pl_title $op $continueTitle OR " .
  95                                         "(pl_title = $continueTitle AND " .
  96                                         "pl_from $op= $continueFrom)"
  97                                 );
  98                         }
  99                 }
 100
 101                 $from = ( is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
 102                 $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
 103                 $this->addWhereRange( 'pl_title', 'newer', $from, $to );
 104
 105                 if ( isset( $params['prefix'] ) ) {
 106                         $this->addWhere( 'pl_title' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
 107                 }
 108
 109                 $this->addFields( 'pl_title' );
 110                 $this->addFieldsIf( 'pl_from', !$params['unique'] );
 111
 112                 $this->addOption( 'USE INDEX', 'pl_namespace' );
 113                 $limit = $params['limit'];
 114                 $this->addOption( 'LIMIT', $limit + 1 );
 115
 116                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
 117                 $orderBy = array();
 118                 $orderBy[] = 'pl_title' . $sort;
 119                 if ( !$params['unique'] ) {
 120                         $orderBy[] = 'pl_from' . $sort;
 121                 }
 122                 $this->addOption( 'ORDER BY', $orderBy );
 123
 124                 $res = $this->select( __METHOD__ );
 125
 126                 $pageids = array();
 127                 $count = 0;
 128                 $result = $this->getResult();
 129                 foreach ( $res as $row ) {
 130                         if ( ++ $count > $limit ) {
 131                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 132                                 if ( $params['unique'] ) {
 133                                         $this->setContinueEnumParameter( 'continue', $row->pl_title );
 134                                 } else {
 135                                         $this->setContinueEnumParameter( 'continue', $row->pl_title . "|" . $row->pl_from );
 136                                 }
 137                                 break;
 138                         }
 139
 140                         if ( is_null( $resultPageSet ) ) {
 141                                 $vals = array();
 142                                 if ( $fld_ids ) {
 143                                         $vals['fromid'] = intval( $row->pl_from );
 144                                 }
 145                                 if ( $fld_title ) {
 146                                         $title = Title::makeTitle( $params['namespace'], $row->pl_title );
 147                                         ApiQueryBase::addTitleInfo( $vals, $title );
 148                                 }
 149                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 150                                 if ( !$fit ) {
 151                                         if ( $params['unique'] ) {
 152                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title );
 153                                         } else {
 154                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title . "|" . $row->pl_from );
 155                                         }
 156                                         break;
 157                                 }
 158                         } else {
 159                                 $pageids[] = $row->pl_from;
 160                         }
 161                 }
 162
 163                 if ( is_null( $resultPageSet ) ) {
 164                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'l' );
 165                 } else {
 166                         $resultPageSet->populateFromPageIDs( $pageids );
 167                 }
 168         }
 169
 170         public function getAllowedParams() {
 171                 return array(
 172                         'continue' => null,
 173                         'from' => null,
 174                         'to' => null,
 175                         'prefix' => null,
 176                         'unique' => false,
 177                         'prop' => array(
 178                                 ApiBase::PARAM_ISMULTI => true,
 179                                 ApiBase::PARAM_DFLT => 'title',
 180                                 ApiBase::PARAM_TYPE => array(
 181                                         'ids',
 182                                         'title'
 183                                 )
 184                         ),
 185                         'namespace' => array(
 186                                 ApiBase::PARAM_DFLT => 0,
 187                                 ApiBase::PARAM_TYPE => 'namespace'
 188                         ),
 189                         'limit' => array(
 190                                 ApiBase::PARAM_DFLT => 10,
 191                                 ApiBase::PARAM_TYPE => 'limit',
 192                                 ApiBase::PARAM_MIN => 1,
 193                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 194                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 195                         ),
 196                         'dir' => array(
 197                                 ApiBase::PARAM_DFLT => 'ascending',
 198                                 ApiBase::PARAM_TYPE => array(
 199                                         'ascending',
 200                                         'descending'
 201                                 )
 202                         ),
 203                 );
 204         }
 205
 206         public function getParamDescription() {
 207                 $p = $this->getModulePrefix();
 208                 return array(
 209                         'from' => 'The page title to start enumerating from',
 210                         'to' => 'The page title to stop enumerating at',
 211                         'prefix' => 'Search for all page titles that begin with this value',
 212                         'unique' => "Only show unique links. Cannot be used with generator or {$p}prop=ids",
 213                         'prop' => array(
 214                                 'What pieces of information to include',
 215                                 " ids    - Adds pageid of where the link is from (Cannot be used with {$p}unique)",
 216                                 ' title  - Adds the title of the link',
 217                         ),
 218                         'namespace' => 'The namespace to enumerate',
 219                         'limit' => 'How many total links to return',
 220                         'continue' => 'When more results are available, use this to continue',
 221                         'dir' => 'The direction in which to list',
 222                 );
 223         }
 224
 225         public function getResultProperties() {
 226                 return array(
 227                         'ids' => array(
 228                                 'fromid' => 'integer'
 229                         ),
 230                         'title' => array(
 231                                 'ns' => 'namespace',
 232                                 'title' => 'string'
 233                         )
 234                 );
 235         }
 236
 237         public function getDescription() {
 238                 return 'Enumerate all links that point to a given namespace';
 239         }
 240
 241         public function getPossibleErrors() {
 242                 $m = $this->getModuleName();
 243                 return array_merge( parent::getPossibleErrors(), array(
 244                         array( 'code' => 'params', 'info' => "{$m} cannot be used as a generator in unique links mode" ),
 245                         array( 'code' => 'params', 'info' => "{$m} cannot return corresponding page ids in unique links mode" ),
 246                         array( 'code' => 'params', 'info' => 'alcontinue and alfrom cannot be used together' ),
 247                         array( 'code' => 'badcontinue', 'info' => 'Invalid continue parameter' ),
 248                 ) );
 249         }
 250
 251         public function getExamples() {
 252                 return array(
 253                         'api.php?action=query&list=alllinks&alunique=&alfrom=B',
 254                 );
 255         }
 256
 257         public function getHelpUrls() {
 258                 return 'https://www.mediawiki.org/wiki/API:Alllinks';
 259         }
 260
 261         public function getVersion() {
 262                 return __CLASS__ . ': $Id$';
 263         }
 264 }