4 * Created on May 12, 2007
6 * API for MediaWiki 1.8+
8 * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
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.
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.
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
26 if ( !defined( 'MEDIAWIKI' ) ) {
27 // Eclipse helper - will be ignored in production
28 require_once( "ApiQueryBase.php" );
32 * A query module to list all wiki links on a given set of pages.
36 class ApiQueryLinks
extends ApiQueryGeneratorBase
{
38 const LINKS
= 'links';
39 const TEMPLATES
= 'templates';
41 private $table, $prefix, $description;
43 public function __construct( $query, $moduleName ) {
44 switch ( $moduleName ) {
46 $this->table
= 'pagelinks';
48 $this->description
= 'link';
51 $this->table
= 'templatelinks';
53 $this->description
= 'template';
56 ApiBase
::dieDebug( __METHOD__
, 'Unknown module name' );
59 parent
::__construct( $query, $moduleName, $this->prefix
);
62 public function execute() {
66 public function executeGenerator( $resultPageSet ) {
67 $this->run( $resultPageSet );
70 private function run( $resultPageSet = null ) {
71 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
72 return; // nothing to do
75 $params = $this->extractRequestParams();
77 $this->addFields( array(
78 $this->prefix
. '_from AS pl_from',
79 $this->prefix
. '_namespace AS pl_namespace',
80 $this->prefix
. '_title AS pl_title'
83 $this->addTables( $this->table
);
84 $this->addWhereFld( $this->prefix
. '_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
85 $this->addWhereFld( $this->prefix
. '_namespace', $params['namespace'] );
87 if ( !is_null( $params['continue'] ) ) {
88 $cont = explode( '|', $params['continue'] );
89 if ( count( $cont ) != 3 ) {
90 $this->dieUsage( 'Invalid continue param. You should pass the ' .
91 'original value returned by the previous query', '_badcontinue' );
93 $plfrom = intval( $cont[0] );
94 $plns = intval( $cont[1] );
95 $pltitle = $this->getDB()->strencode( $this->titleToKey( $cont[2] ) );
97 "{$this->prefix}_from > $plfrom OR " .
98 "({$this->prefix}_from = $plfrom AND " .
99 "({$this->prefix}_namespace > $plns OR " .
100 "({$this->prefix}_namespace = $plns AND " .
101 "{$this->prefix}_title >= '$pltitle')))"
105 // Here's some MySQL craziness going on: if you use WHERE foo='bar'
106 // and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless
107 // but instead goes and filesorts, because the index for foo was used
108 // already. To work around this, we drop constant fields in the WHERE
109 // clause from the ORDER BY clause
111 if ( count( $this->getPageSet()->getGoodTitles() ) != 1 ) {
112 $order[] = "{$this->prefix}_from";
114 if ( count( $params['namespace'] ) != 1 ) {
115 $order[] = "{$this->prefix}_namespace";
118 $order[] = "{$this->prefix}_title";
119 $this->addOption( 'ORDER BY', implode( ', ', $order ) );
120 $this->addOption( 'USE INDEX', "{$this->prefix}_from" );
121 $this->addOption( 'LIMIT', $params['limit'] +
1 );
123 $db = $this->getDB();
124 $res = $this->select( __METHOD__
);
126 if ( is_null( $resultPageSet ) ) {
128 while ( $row = $db->fetchObject( $res ) ) {
129 if ( ++
$count > $params['limit'] ) {
130 // We've reached the one extra which shows that
131 // there are additional pages to be had. Stop here...
132 $this->setContinueEnumParameter( 'continue',
133 "{$row->pl_from}|{$row->pl_namespace}|" .
134 $this->keyToTitle( $row->pl_title
) );
138 ApiQueryBase
::addTitleInfo( $vals, Title
::makeTitle( $row->pl_namespace
, $row->pl_title
) );
139 $fit = $this->addPageSubItem( $row->pl_from
, $vals );
141 $this->setContinueEnumParameter( 'continue',
142 "{$row->pl_from}|{$row->pl_namespace}|" .
143 $this->keyToTitle( $row->pl_title
) );
150 while ( $row = $db->fetchObject( $res ) ) {
151 if ( ++
$count > $params['limit'] ) {
152 // We've reached the one extra which shows that
153 // there are additional pages to be had. Stop here...
154 $this->setContinueEnumParameter( 'continue',
155 "{$row->pl_from}|{$row->pl_namespace}|" .
156 $this->keyToTitle( $row->pl_title
) );
159 $titles[] = Title
::makeTitle( $row->pl_namespace
, $row->pl_title
);
161 $resultPageSet->populateFromTitles( $titles );
164 $db->freeResult( $res );
167 public function getAllowedParams() {
169 'namespace' => array(
170 ApiBase
::PARAM_TYPE
=> 'namespace',
171 ApiBase
::PARAM_ISMULTI
=> true
174 ApiBase
::PARAM_DFLT
=> 10,
175 ApiBase
::PARAM_TYPE
=> 'limit',
176 ApiBase
::PARAM_MIN
=> 1,
177 ApiBase
::PARAM_MAX
=> ApiBase
::LIMIT_BIG1
,
178 ApiBase
::PARAM_MAX2
=> ApiBase
::LIMIT_BIG2
184 public function getParamDescription() {
185 $desc = $this->description
;
187 'namespace' => "Show {$desc}s in this namespace(s) only",
188 'limit' => "How many {$desc}s to return",
189 'continue' => 'When more results are available, use this to continue',
193 public function getDescription() {
194 return "Returns all {$this->description}s from the given page(s)";
197 protected function getExamples() {
199 "Get {$this->description}s from the [[Main Page]]:",
200 " api.php?action=query&prop={$this->getModuleName()}&titles=Main%20Page",
201 "Get information about the {$this->description} pages in the [[Main Page]]:",
202 " api.php?action=query&generator={$this->getModuleName()}&titles=Main%20Page&prop=info",
203 "Get {$this->description}s from the Main Page in the User and Template namespaces:",
204 " api.php?action=query&prop={$this->getModuleName()}&titles=Main%20Page&{$this->prefix}namespace=2|10"
208 public function getVersion() {
209 return __CLASS__
. ': $Id$';