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, $titlesParam, $helpUrl;
39 public function __construct( ApiQuery $query, $moduleName ) {
40 switch ( $moduleName ) {
42 $this->table = 'pagelinks';
44 $this->titlesParam = 'titles';
45 $this->helpUrl = 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Links';
48 $this->table = 'templatelinks';
50 $this->titlesParam = 'templates';
51 $this->helpUrl = 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Templates';
54 ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
57 parent::__construct( $query, $moduleName, $this->prefix );
60 public function execute() {
64 public function getCacheMode( $params ) {
68 public function executeGenerator( $resultPageSet ) {
69 $this->run( $resultPageSet );
73 * @param ApiPageSet $resultPageSet
75 private function run( $resultPageSet = null ) {
76 if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
77 return; // nothing to do
80 $params = $this->extractRequestParams();
83 'pl_from' => $this->prefix . '_from',
84 'pl_namespace' => $this->prefix . '_namespace',
85 'pl_title' => $this->prefix . '_title'
88 $this->addTables( $this->table );
89 $this->addWhereFld( $this->prefix . '_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
90 $this->addWhereFld( $this->prefix . '_namespace', $params['namespace'] );
92 if ( !is_null( $params[$this->titlesParam] ) ) {
94 foreach ( $params[$this->titlesParam] as $t ) {
95 $title = Title::newFromText( $t );
97 $this->addWarning( [ 'apiwarn-invalidtitle', wfEscapeWikiText( $t ) ] );
99 $lb->addObj( $title );
102 $cond = $lb->constructSet( $this->prefix, $this->getDB() );
104 $this->addWhere( $cond );
108 if ( !is_null( $params['continue'] ) ) {
109 $cont = explode( '|', $params['continue'] );
110 $this->dieContinueUsageIf( count( $cont ) != 3 );
111 $op = $params['dir'] == 'descending' ? '<' : '>';
112 $plfrom = intval( $cont[0] );
113 $plns = intval( $cont[1] );
114 $pltitle = $this->getDB()->addQuotes( $cont[2] );
116 "{$this->prefix}_from $op $plfrom OR " .
117 "({$this->prefix}_from = $plfrom AND " .
118 "({$this->prefix}_namespace $op $plns OR " .
119 "({$this->prefix}_namespace = $plns AND " .
120 "{$this->prefix}_title $op= $pltitle)))"
124 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
125 // Here's some MySQL craziness going on: if you use WHERE foo='bar'
126 // and later ORDER BY foo MySQL doesn't notice the ORDER BY is pointless
127 // but instead goes and filesorts, because the index for foo was used
128 // already. To work around this, we drop constant fields in the WHERE
129 // clause from the ORDER BY clause
131 if ( count( $this->getPageSet()->getGoodTitles() ) != 1 ) {
132 $order[] = $this->prefix . '_from' . $sort;
134 if ( count( $params['namespace'] ) != 1 ) {
135 $order[] = $this->prefix . '_namespace' . $sort;
138 $order[] = $this->prefix . '_title' . $sort;
139 $this->addOption( 'ORDER BY', $order );
140 $this->addOption( 'LIMIT', $params['limit'] + 1 );
142 $res = $this->select( __METHOD__ );
144 if ( is_null( $resultPageSet ) ) {
146 foreach ( $res as $row ) {
147 if ( ++$count > $params['limit'] ) {
148 // We've reached the one extra which shows that
149 // there are additional pages to be had. Stop here...
150 $this->setContinueEnumParameter( 'continue',
151 "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
155 ApiQueryBase::addTitleInfo( $vals, Title::makeTitle( $row->pl_namespace, $row->pl_title ) );
156 $fit = $this->addPageSubItem( $row->pl_from, $vals );
158 $this->setContinueEnumParameter( 'continue',
159 "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
166 foreach ( $res as $row ) {
167 if ( ++$count > $params['limit'] ) {
168 // We've reached the one extra which shows that
169 // there are additional pages to be had. Stop here...
170 $this->setContinueEnumParameter( 'continue',
171 "{$row->pl_from}|{$row->pl_namespace}|{$row->pl_title}" );
174 $titles[] = Title::makeTitle( $row->pl_namespace, $row->pl_title );
176 $resultPageSet->populateFromTitles( $titles );
180 public function getAllowedParams() {
183 ApiBase::PARAM_TYPE => 'namespace',
184 ApiBase::PARAM_ISMULTI => true,
185 ApiBase::PARAM_EXTRA_NAMESPACES => [ NS_MEDIA, NS_SPECIAL ],
188 ApiBase::PARAM_DFLT => 10,
189 ApiBase::PARAM_TYPE => 'limit',
190 ApiBase::PARAM_MIN => 1,
191 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
192 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
195 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
197 $this->titlesParam => [
198 ApiBase::PARAM_ISMULTI => true,
201 ApiBase::PARAM_DFLT => 'ascending',
202 ApiBase::PARAM_TYPE => [
210 protected function getExamplesMessages() {
211 $name = $this->getModuleName();
212 $path = $this->getModulePath();
215 "action=query&prop={$name}&titles=Main%20Page"
216 => "apihelp-{$path}-example-simple",
217 "action=query&generator={$name}&titles=Main%20Page&prop=info"
218 => "apihelp-{$path}-example-generator",
219 "action=query&prop={$name}&titles=Main%20Page&{$this->prefix}namespace=2|10"
220 => "apihelp-{$path}-example-namespaces",
224 public function getHelpUrls() {
225 return $this->helpUrl;