5 * Created on May 12, 2007
7 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
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.
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.
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
28 * A query module to list all wiki links on a given set of pages.
32 class ApiQueryLinks
extends ApiQueryGeneratorBase
{
34 const LINKS
= 'links';
35 const TEMPLATES
= 'templates';
37 private $table, $prefix, $description, $helpUrl;
39 public function __construct( ApiQuery
$query, $moduleName ) {
40 switch ( $moduleName ) {
42 $this->table
= 'pagelinks';
44 $this->description
= 'link';
45 $this->titlesParam
= 'titles';
46 $this->titlesParamDescription
= 'Only list links to these titles. Useful ' .
47 'for checking whether a certain page links to a certain title.';
48 $this->helpUrl
= 'https://www.mediawiki.org/wiki/API:Properties#links_.2F_pl';
51 $this->table
= 'templatelinks';
53 $this->description
= 'template';
54 $this->titlesParam
= 'templates';
55 $this->titlesParamDescription
= 'Only list these templates. Useful ' .
56 'for checking whether a certain page uses a certain template.';
57 $this->helpUrl
= 'https://www.mediawiki.org/wiki/API:Properties#templates_.2F_tl';
60 ApiBase
::dieDebug( __METHOD__
, 'Unknown module name' );
63 parent
::__construct( $query, $moduleName, $this->prefix
);
66 public function execute() {
70 public function getCacheMode( $params ) {
74 public function executeGenerator( $resultPageSet ) {
75 $this->run( $resultPageSet );
79 * @param ApiPageSet $resultPageSet
81 private function run( $resultPageSet = null ) {
82 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
83 return; // nothing to do
86 $params = $this->extractRequestParams();
88 $this->addFields( array(
89 'pl_from' => $this->prefix
. '_from',
90 'pl_namespace' => $this->prefix
. '_namespace',
91 'pl_title' => $this->prefix
. '_title'
94 $this->addTables( $this->table
);
95 $this->addWhereFld( $this->prefix
. '_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
96 $this->addWhereFld( $this->prefix
. '_namespace', $params['namespace'] );
98 if ( !is_null( $params[$this->titlesParam
] ) ) {
100 foreach ( $params[$this->titlesParam
] as $t ) {
101 $title = Title
::newFromText( $t );
103 $this->setWarning( "\"$t\" is not a valid title" );
105 $lb->addObj( $title );
108 $cond = $lb->constructSet( $this->prefix
, $this->getDB() );
110 $this->addWhere( $cond );
114 if ( !is_null( $params['continue'] ) ) {
115 $cont = explode( '|', $params['continue'] );
116 $this->dieContinueUsageIf( count( $cont ) != 3 );
117 $op = $params['dir'] == 'descending' ?
'<' : '>';
118 $plfrom = intval( $cont[0] );
119 $plns = intval( $cont[1] );
120 $pltitle = $this->getDB()->addQuotes( $cont[2] );
122 "{$this->prefix}_from $op $plfrom OR " .
123 "({$this->prefix}_from = $plfrom AND " .
124 "({$this->prefix}_namespace $op $plns OR " .
125 "({$this->prefix}_namespace = $plns AND " .
126 "{$this->prefix}_title $op= $pltitle)))"
130 $sort = ( $params['dir'] == 'descending' ?
' DESC' : '' );
131 // Here's some MySQL craziness going on: if you use WHERE foo='bar'
132 // and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless
133 // but instead goes and filesorts, because the index for foo was used
134 // already. To work around this, we drop constant fields in the WHERE
135 // clause from the ORDER BY clause
137 if ( count( $this->getPageSet()->getGoodTitles() ) != 1 ) {
138 $order[] = $this->prefix
. '_from' . $sort;
140 if ( count( $params['namespace'] ) != 1 ) {
141 $order[] = $this->prefix
. '_namespace' . $sort;
144 $order[] = $this->prefix
. '_title' . $sort;
145 $this->addOption( 'ORDER BY', $order );
146 $this->addOption( 'USE INDEX', $this->prefix
. '_from' );
147 $this->addOption( 'LIMIT', $params['limit'] +
1 );
149 $res = $this->select( __METHOD__
);
151 if ( is_null( $resultPageSet ) ) {
153 foreach ( $res as $row ) {
154 if ( ++
$count > $params['limit'] ) {
155 // We've reached the one extra which shows that
156 // there are additional pages to be had. Stop here...
157 $this->setContinueEnumParameter( 'continue',
158 "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
162 ApiQueryBase
::addTitleInfo( $vals, Title
::makeTitle( $row->pl_namespace
, $row->pl_title
) );
163 $fit = $this->addPageSubItem( $row->pl_from
, $vals );
165 $this->setContinueEnumParameter( 'continue',
166 "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
173 foreach ( $res as $row ) {
174 if ( ++
$count > $params['limit'] ) {
175 // We've reached the one extra which shows that
176 // there are additional pages to be had. Stop here...
177 $this->setContinueEnumParameter( 'continue',
178 "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
181 $titles[] = Title
::makeTitle( $row->pl_namespace
, $row->pl_title
);
183 $resultPageSet->populateFromTitles( $titles );
187 public function getAllowedParams() {
189 'namespace' => array(
190 ApiBase
::PARAM_TYPE
=> 'namespace',
191 ApiBase
::PARAM_ISMULTI
=> true
194 ApiBase
::PARAM_DFLT
=> 10,
195 ApiBase
::PARAM_TYPE
=> 'limit',
196 ApiBase
::PARAM_MIN
=> 1,
197 ApiBase
::PARAM_MAX
=> ApiBase
::LIMIT_BIG1
,
198 ApiBase
::PARAM_MAX2
=> ApiBase
::LIMIT_BIG2
201 $this->titlesParam
=> array(
202 ApiBase
::PARAM_ISMULTI
=> true,
205 ApiBase
::PARAM_DFLT
=> 'ascending',
206 ApiBase
::PARAM_TYPE
=> array(
214 public function getParamDescription() {
215 $desc = $this->description
;
218 'namespace' => "Show {$desc}s in this namespace(s) only",
219 'limit' => "How many {$desc}s to return",
220 'continue' => 'When more results are available, use this to continue',
221 $this->titlesParam
=> $this->titlesParamDescription
,
222 'dir' => 'The direction in which to list',
226 public function getResultProperties() {
235 public function getDescription() {
236 return "Returns all {$this->description}s from the given page(s).";
239 public function getExamples() {
240 $desc = $this->description
;
241 $name = $this->getModuleName();
244 "api.php?action=query&prop={$name}&titles=Main%20Page" => "Get {$desc}s from the [[Main Page]]",
245 "api.php?action=query&generator={$name}&titles=Main%20Page&prop=info"
246 => "Get information about the {$desc} pages in the [[Main Page]]",
247 "api.php?action=query&prop={$name}&titles=Main%20Page&{$this->prefix}namespace=2|10"
248 => "Get {$desc}s from the Main Page in the User and Template namespaces",
252 public function getHelpUrls() {
253 return $this->helpUrl
;