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 /**
  28  * Query module to enumerate change tags.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryTags extends ApiQueryBase {
  33
  34         /**
  35          * @var ApiResult
  36          */
  37         private $result;
  38
  39         private $limit;
  40         private $fld_displayname = false, $fld_description = false,
  41                         $fld_hitcount = false;
  42
  43         public function __construct( $query, $moduleName ) {
  44                 parent::__construct( $query, $moduleName, 'tg' );
  45         }
  46
  47         public function execute() {
  48                 $params = $this->extractRequestParams();
  49
  50                 $prop = array_flip( $params['prop'] );
  51
  52                 $this->fld_displayname = isset( $prop['displayname'] );
  53                 $this->fld_description = isset( $prop['description'] );
  54                 $this->fld_hitcount = isset( $prop['hitcount'] );
  55
  56                 $this->limit = $params['limit'];
  57                 $this->result = $this->getResult();
  58
  59                 $this->addTables( 'change_tag' );
  60                 $this->addFields( 'ct_tag' );
  61
  62                 $this->addFieldsIf( 'count(*) AS hitcount', $this->fld_hitcount );
  63
  64                 $this->addOption( 'LIMIT', $this->limit + 1 );
  65                 $this->addOption( 'GROUP BY', 'ct_tag' );
  66                 $this->addWhereRange( 'ct_tag', 'newer', $params['continue'], null );
  67
  68                 $res = $this->select( __METHOD__ );
  69
  70                 $ok = true;
  71
  72                 foreach ( $res as $row ) {
  73                         if ( !$ok ) {
  74                                 break;
  75                         }
  76                         $ok = $this->doTag( $row->ct_tag, $row->hitcount );
  77                 }
  78
  79                 // include tags with no hits yet
  80                 foreach ( ChangeTags::listDefinedTags() as $tag ) {
  81                         if ( !$ok ) {
  82                                 break;
  83                         }
  84                         $ok = $this->doTag( $tag, 0 );
  85                 }
  86
  87                 $this->result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'tag' );
  88         }
  89
  90         private function doTag( $tagName, $hitcount ) {
  91                 static $count = 0;
  92                 static $doneTags = array();
  93
  94                 if ( in_array( $tagName, $doneTags ) ) {
  95                         return true;
  96                 }
  97
  98                 if ( ++$count > $this->limit ) {
  99                         $this->setContinueEnumParameter( 'continue', $tagName );
 100                         return false;
 101                 }
 102
 103                 $tag = array();
 104                 $tag['name'] = $tagName;
 105
 106                 if ( $this->fld_displayname ) {
 107                         $tag['displayname'] = ChangeTags::tagDescription( $tagName );
 108                 }
 109
 110                 if ( $this->fld_description ) {
 111                         $msg = wfMessage( "tag-$tagName-description" );
 112                         $tag['description'] = $msg->exists() ? $msg->text() : '';
 113                 }
 114
 115                 if ( $this->fld_hitcount ) {
 116                         $tag['hitcount'] = $hitcount;
 117                 }
 118
 119                 $doneTags[] = $tagName;
 120
 121                 $fit = $this->result->addValue( array( 'query', $this->getModuleName() ), null, $tag );
 122                 if ( !$fit ) {
 123                         $this->setContinueEnumParameter( 'continue', $tagName );
 124                         return false;
 125                 }
 126
 127                 return true;
 128         }
 129
 130         public function getCacheMode( $params ) {
 131                 return 'public';
 132         }
 133
 134         public function getAllowedParams() {
 135                 return array(
 136                         'continue' => array(
 137                         ),
 138                         'limit' => array(
 139                                 ApiBase::PARAM_DFLT => 10,
 140                                 ApiBase::PARAM_TYPE => 'limit',
 141                                 ApiBase::PARAM_MIN => 1,
 142                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 143                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 144                         ),
 145                         'prop' => array(
 146                                 ApiBase::PARAM_DFLT => 'name',
 147                                 ApiBase::PARAM_TYPE => array(
 148                                         'name',
 149                                         'displayname',
 150                                         'description',
 151                                         'hitcount'
 152                                 ),
 153                                 ApiBase::PARAM_ISMULTI => true
 154                         )
 155                 );
 156         }
 157
 158         public function getParamDescription() {
 159                 return array(
 160                         'continue' => 'When more results are available, use this to continue',
 161                         'limit' => 'The maximum number of tags to list',
 162                         'prop' => array(
 163                                 'Which properties to get',
 164                                 ' name         - Adds name of tag',
 165                                 ' displayname  - Adds system messsage for the tag',
 166                                 ' description  - Adds description of the tag',
 167                                 ' hitcount     - Adds the amount of revisions that have this tag',
 168                         ),
 169                 );
 170         }
 171
 172         public function getDescription() {
 173                 return 'List change tags';
 174         }
 175
 176         public function getExamples() {
 177                 return array(
 178                         'api.php?action=query&list=tags&tgprop=displayname|description|hitcount'
 179                 );
 180         }
 181
 182         public function getVersion() {
 183                 return __CLASS__ . ': $Id$';
 184         }
 185 }