includes/api/ApiQueryPageProps.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Aug 7, 2010
   6  *
   7  * Copyright © 2010 soxred93, Bryan Tong Minh
   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 show basic page information.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryPageProps extends ApiQueryBase {
  33
  34         private $params;
  35
  36         public function __construct( ApiQuery $query, $moduleName ) {
  37                 parent::__construct( $query, $moduleName, 'pp' );
  38         }
  39
  40         public function execute() {
  41                 # Only operate on existing pages
  42                 $pages = $this->getPageSet()->getGoodTitles();
  43                 if ( !count( $pages ) ) {
  44                         # Nothing to do
  45                         return;
  46                 }
  47
  48                 $this->params = $this->extractRequestParams();
  49
  50                 $this->addTables( 'page_props' );
  51                 $this->addFields( array( 'pp_page', 'pp_propname', 'pp_value' ) );
  52                 $this->addWhereFld( 'pp_page', array_keys( $pages ) );
  53
  54                 if ( $this->params['continue'] ) {
  55                         $this->addWhere( 'pp_page >=' . intval( $this->params['continue'] ) );
  56                 }
  57
  58                 if ( $this->params['prop'] ) {
  59                         $this->addWhereFld( 'pp_propname', $this->params['prop'] );
  60                 }
  61
  62                 # Force a sort order to ensure that properties are grouped by page
  63                 # But only if pp_page is not constant in the WHERE clause.
  64                 if ( count( $pages ) > 1 ) {
  65                         $this->addOption( 'ORDER BY', 'pp_page' );
  66                 }
  67
  68                 $res = $this->select( __METHOD__ );
  69                 $currentPage = 0; # Id of the page currently processed
  70                 $props = array();
  71                 $result = $this->getResult();
  72
  73                 foreach ( $res as $row ) {
  74                         if ( $currentPage != $row->pp_page ) {
  75                                 # Different page than previous row, so add the properties to
  76                                 # the result and save the new page id
  77
  78                                 if ( $currentPage ) {
  79                                         if ( !$this->addPageProps( $result, $currentPage, $props ) ) {
  80                                                 # addPageProps() indicated that the result did not fit
  81                                                 # so stop adding data. Reset props so that it doesn't
  82                                                 # get added again after loop exit
  83
  84                                                 $props = array();
  85                                                 break;
  86                                         }
  87
  88                                         $props = array();
  89                                 }
  90
  91                                 $currentPage = $row->pp_page;
  92                         }
  93
  94                         $props[$row->pp_propname] = $row->pp_value;
  95                 }
  96
  97                 if ( count( $props ) ) {
  98                         # Add any remaining properties to the results
  99                         $this->addPageProps( $result, $currentPage, $props );
 100                 }
 101         }
 102
 103         /**
 104          * Add page properties to an ApiResult, adding a continue
 105          * parameter if it doesn't fit.
 106          *
 107          * @param ApiResult $result
 108          * @param int $page
 109          * @param array $props
 110          * @return bool True if it fits in the result
 111          */
 112         private function addPageProps( $result, $page, $props ) {
 113                 $fit = $result->addValue( array( 'query', 'pages', $page ), 'pageprops', $props );
 114
 115                 if ( !$fit ) {
 116                         $this->setContinueEnumParameter( 'continue', $page );
 117                 }
 118
 119                 return $fit;
 120         }
 121
 122         public function getCacheMode( $params ) {
 123                 return 'public';
 124         }
 125
 126         public function getAllowedParams() {
 127                 return array(
 128                         'continue' => null,
 129                         'prop' => array(
 130                                 ApiBase::PARAM_ISMULTI => true,
 131                         ),
 132                 );
 133         }
 134
 135         public function getParamDescription() {
 136                 return array(
 137                         'continue' => 'When more results are available, use this to continue',
 138                         'prop' => 'Only list these props. Useful for checking whether a ' .
 139                                 'certain page uses a certain page prop',
 140                 );
 141         }
 142
 143         public function getDescription() {
 144                 return 'Get various properties defined in the page content.';
 145         }
 146
 147         public function getExamples() {
 148                 return array(
 149                         'api.php?action=query&prop=pageprops&titles=Category:Foo',
 150                 );
 151         }
 152
 153         public function getHelpUrls() {
 154                 return 'https://www.mediawiki.org/wiki/API:Properties#pageprops_.2F_pp';
 155         }
 156 }