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 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( 'ApiQueryBase.php' );
  30 }
  31
  32 /**
  33  * A query module to show basic page information.
  34  *
  35  * @ingroup API
  36  */
  37 class ApiQueryPageProps extends ApiQueryBase {
  38
  39         private $params;
  40
  41         public function __construct( $query, $moduleName ) {
  42                 parent::__construct( $query, $moduleName, 'pp' );
  43         }
  44
  45         public function execute() {
  46                 $this->params = $this->extractRequestParams();
  47
  48                 # Only operate on existing pages
  49                 $pages = $this->getPageSet()->getGoodTitles();
  50
  51                 $this->addTables( 'page_props' );
  52                 $this->addFields( array( 'pp_page', 'pp_propname', 'pp_value' ) );
  53                 $this->addWhereFld( 'pp_page',  array_keys( $pages ) );
  54
  55                 if ( $this->params['continue'] ) {
  56                         $this->addWhere( 'pp_page >=' . intval( $this->params['continue'] ) );
  57                 }
  58
  59                 # Force a sort order to ensure that properties are grouped by page
  60                 $this->addOption( 'ORDER BY', 'pp_page' );
  61
  62                 $res = $this->select( __METHOD__ );
  63                 $currentPage = 0; # Id of the page currently processed
  64                 $props = array();
  65                 $result = $this->getResult();
  66
  67                 foreach ( $res as $row ) {
  68                         if ( $currentPage != $row->pp_page ) {
  69                                 # Different page than previous row, so add the properties to
  70                                 # the result and save the new page id
  71
  72                                 if ( $currentPage ) {
  73                                         if ( !$this->addPageProps( $result, $currentPage, $props ) ) {
  74                                                 # addPageProps() indicated that the result did not fit
  75                                                 # so stop adding data. Reset props so that it doesn't
  76                                                 # get added again after loop exit
  77
  78                                                 $props = array();
  79                                                 break;
  80                                         }
  81
  82                                         $props = array();
  83                                 }
  84
  85                                 $currentPage = $row->pp_page;
  86                         }
  87
  88                         $props[$row->pp_propname] = $row->pp_value;
  89                 }
  90
  91                 if ( count( $props ) ) {
  92                         # Add any remaining properties to the results
  93                         $this->addPageProps( $result, $currentPage, $props );
  94                 }
  95         }
  96
  97         /**
  98          * Add page properties to an ApiResult, adding a continue
  99          * parameter if it doesn't fit.
 100          *
 101          * @param $result ApiResult
 102          * @param $page int
 103          * @param $props array
 104          * @return bool True if it fits in the result
 105          */
 106         private function addPageProps( $result, $page, $props ) {
 107                 $fit = $result->addValue( array( 'query', 'pages' ), $page, $props );
 108
 109                 if ( !$fit ) {
 110                         $this->setContinueEnumParameter( 'continue', $page );
 111                 }
 112                 return $fit;
 113         }
 114
 115         public function getCacheMode( $params ) {
 116                 return 'public';
 117         }
 118
 119         public function getAllowedParams() {
 120                 return array( 'continue' => null );
 121         }
 122
 123         public function getParamDescription() {
 124                 return  array( 'continue' => 'When more results are available, use this to continue' );
 125         }
 126
 127         public function getDescription() {
 128                 return 'Get various properties defined in the page content';
 129         }
 130
 131         public function getPossibleErrors() {
 132                 return array_merge( parent::getPossibleErrors(), array(
 133                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 134                 ) );
 135         }
 136
 137         protected function getExamples() {
 138                 return array(
 139                         'api.php?action=query&prop=pageprops&titles=Category:Foo',
 140                 );
 141         }
 142
 143         public function getVersion() {
 144                 return __CLASS__ . ': $Id$';
 145         }
 146 }