includes/api/ApiQueryAllLinks.php

   1 <?php
   2
   3 /*
   4  * Created on July 7, 2007
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if (!defined('MEDIAWIKI')) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ('ApiQueryBase.php');
  29 }
  30
  31 /**
  32  * Query module to enumerate links from all pages together.
  33  *
  34  * @addtogroup API
  35  */
  36 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  37
  38         public function __construct($query, $moduleName) {
  39                 parent :: __construct($query, $moduleName, 'al');
  40         }
  41
  42         public function execute() {
  43                 $this->run();
  44         }
  45
  46         public function executeGenerator($resultPageSet) {
  47                 $this->run($resultPageSet);
  48         }
  49
  50         private function run($resultPageSet = null) {
  51
  52                 $db = $this->getDB();
  53                 $params = $this->extractRequestParams();
  54
  55                 $prop = array_flip($params['prop']);
  56                 $fld_ids = isset($prop['ids']);
  57                 $fld_title = isset($prop['title']);
  58
  59                 if ($params['unique']) {
  60                         if (!is_null($resultPageSet))
  61                                 $this->dieUsage($this->getModuleName() . ' cannot be used as a generator in unique links mode', 'params');
  62                         if ($fld_ids)
  63                                 $this->dieUsage($this->getModuleName() . ' cannot return corresponding page ids in unique links mode', 'params');
  64                         $this->addOption('DISTINCT');
  65                 }
  66
  67                 $this->addTables('pagelinks');
  68                 $this->addWhereFld('pl_namespace', $params['namespace']);
  69
  70                 if (!is_null($params['from']))
  71                         $this->addWhere('pl_title>=' . $db->addQuotes(ApiQueryBase :: titleToKey($params['from'])));
  72                 if (isset ($params['prefix']))
  73                         $this->addWhere("pl_title LIKE '" . $db->escapeLike(ApiQueryBase :: titleToKey($params['prefix'])) . "%'");
  74
  75                 if (is_null($resultPageSet)) {
  76                         $this->addFields(array (
  77                                 'pl_namespace',
  78                                 'pl_title'
  79                         ));
  80                         $this->addFieldsIf('pl_from', $fld_ids);
  81                 } else {
  82                         $this->addFields('pl_from');
  83                         $pageids = array();
  84                 }
  85
  86                 $this->addOption('USE INDEX', 'pl_namespace');
  87                 $limit = $params['limit'];
  88                 $this->addOption('LIMIT', $limit+1);
  89                 $this->addOption('ORDER BY', 'pl_namespace, pl_title');
  90
  91                 $res = $this->select(__METHOD__);
  92
  93                 $data = array ();
  94                 $count = 0;
  95                 while ($row = $db->fetchObject($res)) {
  96                         if (++ $count > $limit) {
  97                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
  98                                 // TODO: Security issue - if the user has no right to view next title, it will still be shown
  99                                 $this->setContinueEnumParameter('from', ApiQueryBase :: keyToTitle($row->pl_title));
 100                                 break;
 101                         }
 102
 103                         if (is_null($resultPageSet)) {
 104                                 $vals = array();
 105                                 if ($fld_ids)
 106                                         $vals['fromid'] = intval($row->pl_from);
 107                                 if ($fld_title) {
 108                                         $title = Title :: makeTitle($row->pl_namespace, $row->pl_title);
 109                                         $vals['ns'] = intval($title->getNamespace());
 110                                         $vals['title'] = $title->getPrefixedText();
 111                                 }
 112                                 $data[] = $vals;
 113                         } else {
 114                                 $pageids[] = $row->pl_from;
 115                         }
 116                 }
 117                 $db->freeResult($res);
 118
 119                 if (is_null($resultPageSet)) {
 120                         $result = $this->getResult();
 121                         $result->setIndexedTagName($data, 'l');
 122                         $result->addValue('query', $this->getModuleName(), $data);
 123                 } else {
 124                         $resultPageSet->populateFromPageIDs($pageids);
 125                 }
 126         }
 127
 128         protected function getAllowedParams() {
 129                 return array (
 130                         'from' => null,
 131                         'prefix' => null,
 132                         'unique' => false,
 133                         'prop' => array (
 134                                 ApiBase :: PARAM_ISMULTI => true,
 135                                 ApiBase :: PARAM_DFLT => 'title',
 136                                 ApiBase :: PARAM_TYPE => array (
 137                                         'ids',
 138                                         'title'
 139                                 )
 140                         ),
 141                         'namespace' => array (
 142                                 ApiBase :: PARAM_DFLT => 0,
 143                                 ApiBase :: PARAM_TYPE => 'namespace'
 144                         ),
 145                         'limit' => array (
 146                                 ApiBase :: PARAM_DFLT => 10,
 147                                 ApiBase :: PARAM_TYPE => 'limit',
 148                                 ApiBase :: PARAM_MIN => 1,
 149                                 ApiBase :: PARAM_MAX => ApiBase :: LIMIT_BIG1,
 150                                 ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_BIG2
 151                         )
 152                 );
 153         }
 154
 155         protected function getParamDescription() {
 156                 return array (
 157                         'from' => 'The page title to start enumerating from.',
 158                         'prefix' => 'Search for all page titles that begin with this value.',
 159                         'unique' => 'Only show unique links. Cannot be used with generator or prop=ids',
 160                         'prop' => 'What pieces of information to include',
 161                         'namespace' => 'The namespace to enumerate.',
 162                         'limit' => 'How many total links to return.'
 163                 );
 164         }
 165
 166         protected function getDescription() {
 167                 return 'Enumerate all links that point to a given namespace';
 168         }
 169
 170         protected function getExamples() {
 171                 return array (
 172                         'api.php?action=query&list=alllinks&alunique&alfrom=B',
 173                 );
 174         }
 175
 176         public function getVersion() {
 177                 return __CLASS__ . ': $Id$';
 178         }
 179 }