includes/api/ApiQueryTags.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Jul 9, 2009
   6  *
   7  * Copyright © 2009
   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  * Query module to enumerate change tags.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryTags extends ApiQueryBase {
  38
  39         /**
  40          * @var ApiResult
  41          */
  42         private $result;
  43
  44         private $limit;
  45         private $fld_displayname = false, $fld_description = false,
  46                         $fld_hitcount = false;
  47
  48         public function __construct( $query, $moduleName ) {
  49                 parent::__construct( $query, $moduleName, 'tg' );
  50         }
  51
  52         public function execute() {
  53                 $params = $this->extractRequestParams();
  54
  55                 $prop = array_flip( $params['prop'] );
  56
  57                 $this->fld_displayname = isset( $prop['displayname'] );
  58                 $this->fld_description = isset( $prop['description'] );
  59                 $this->fld_hitcount = isset( $prop['hitcount'] );
  60
  61                 $this->limit = $params['limit'];
  62                 $this->result = $this->getResult();
  63
  64                 $this->addTables( 'change_tag' );
  65                 $this->addFields( 'ct_tag' );
  66
  67                 if ( $this->fld_hitcount ) {
  68                         $this->addFields( 'count(*) AS hitcount' );
  69                 }
  70
  71                 $this->addOption( 'LIMIT', $this->limit + 1 );
  72                 $this->addOption( 'GROUP BY', 'ct_tag' );
  73                 $this->addWhereRange( 'ct_tag', 'newer', $params['continue'], null );
  74
  75                 $res = $this->select( __METHOD__ );
  76
  77                 $ok = true;
  78
  79                 foreach ( $res as $row ) {
  80                         if ( !$ok ) {
  81                                 break;
  82                         }
  83                         $ok = $this->doTag( $row->ct_tag, $row->hitcount );
  84                 }
  85
  86                 // include tags with no hits yet
  87                 foreach ( ChangeTags::listDefinedTags() as $tag ) {
  88                         if ( !$ok ) {
  89                                 break;
  90                         }
  91                         $ok = $this->doTag( $tag, 0 );
  92                 }
  93
  94                 $this->result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'tag' );
  95         }
  96
  97         private function doTag( $tagName, $hitcount ) {
  98                 static $count = 0;
  99                 static $doneTags = array();
 100
 101                 if ( in_array( $tagName, $doneTags ) ) {
 102                         return true;
 103                 }
 104
 105                 if ( ++$count > $this->limit ) {
 106                         $this->setContinueEnumParameter( 'continue', $tagName );
 107                         return false;
 108                 }
 109
 110                 $tag = array();
 111                 $tag['name'] = $tagName;
 112
 113                 if ( $this->fld_displayname ) {
 114                         $tag['displayname'] = ChangeTags::tagDescription( $tagName );
 115                 }
 116
 117                 if ( $this->fld_description ) {
 118                         $msg = wfMsg( "tag-$tagName-description" );
 119                         $msg = wfEmptyMsg( "tag-$tagName-description" ) ? '' : $msg;
 120                         $tag['description'] = $msg;
 121                 }
 122
 123                 if ( $this->fld_hitcount ) {
 124                         $tag['hitcount'] = $hitcount;
 125                 }
 126
 127                 $doneTags[] = $tagName;
 128
 129                 $fit = $this->result->addValue( array( 'query', $this->getModuleName() ), null, $tag );
 130                 if ( !$fit ) {
 131                         $this->setContinueEnumParameter( 'continue', $tagName );
 132                         return false;
 133                 }
 134
 135                 return true;
 136         }
 137
 138         public function getCacheMode( $params ) {
 139                 return 'public';
 140         }
 141
 142         public function getAllowedParams() {
 143                 return array(
 144                         'continue' => array(
 145                         ),
 146                         'limit' => array(
 147                                 ApiBase::PARAM_DFLT => 10,
 148                                 ApiBase::PARAM_TYPE => 'limit',
 149                                 ApiBase::PARAM_MIN => 1,
 150                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 151                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 152                         ),
 153                         'prop' => array(
 154                                 ApiBase::PARAM_DFLT => 'name',
 155                                 ApiBase::PARAM_TYPE => array(
 156                                         'name',
 157                                         'displayname',
 158                                         'description',
 159                                         'hitcount'
 160                                 ),
 161                                 ApiBase::PARAM_ISMULTI => true
 162                         )
 163                 );
 164         }
 165
 166         public function getParamDescription() {
 167                 return array(
 168                         'continue' => 'When more results are available, use this to continue',
 169                         'limit' => 'The maximum number of tags to list',
 170                         'prop' => array(
 171                                 'Which properties to get',
 172                                 ' name         - Adds name of tag',
 173                                 ' displayname  - Adds system messsage for the tag',
 174                                 ' description  - Adds description of the tag',
 175                                 ' hitcount     - Adds the amount of revisions that have this tag',
 176                         ),
 177                 );
 178         }
 179
 180         public function getDescription() {
 181                 return 'List change tags';
 182         }
 183
 184         protected function getExamples() {
 185                 return array(
 186                         'api.php?action=query&list=tags&tgprop=displayname|description|hitcount'
 187                 );
 188         }
 189
 190         public function getVersion() {
 191                 return __CLASS__ . ': $Id$';
 192         }
 193 }