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<?php
/**
*
*
* Created on Monday, January 28, 2008
*
* Copyright © 2008 Brent Garber
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Query module to get list of random pages
*
* @ingroup API
*/
class ApiQueryRandom extends ApiQueryGeneratorBase {
private $pageIDs;
public function __construct( $query, $moduleName ) {
parent::__construct( $query, $moduleName, 'rn' );
}
public function execute() {
$this->run();
}
public function executeGenerator( $resultPageSet ) {
$this->run( $resultPageSet );
}
/**
* @param $randstr
* @param $limit
* @param $namespace
* @param $resultPageSet ApiPageSet
* @param $redirect
* @return void
*/
protected function prepareQuery( $randstr, $limit, $namespace, &$resultPageSet, $redirect ) {
$this->resetQueryParams();
$this->addTables( 'page' );
$this->addOption( 'LIMIT', $limit );
$this->addWhereFld( 'page_namespace', $namespace );
$this->addWhereRange( 'page_random', 'newer', $randstr, null );
$this->addWhereFld( 'page_is_redirect', $redirect );
$this->addOption( 'USE INDEX', 'page_random' );
if ( is_null( $resultPageSet ) ) {
$this->addFields( array( 'page_id', 'page_title', 'page_namespace' ) );
} else {
$this->addFields( $resultPageSet->getPageTableFields() );
}
}
/**
* @param $resultPageSet ApiPageSet
* @return int
*/
protected function runQuery( $resultPageSet = null ) {
$res = $this->select( __METHOD__ );
$count = 0;
foreach ( $res as $row ) {
$count++;
if ( is_null( $resultPageSet ) ) {
// Prevent duplicates
if ( !in_array( $row->page_id, $this->pageIDs ) ) {
$fit = $this->getResult()->addValue(
array( 'query', $this->getModuleName() ),
null, $this->extractRowInfo( $row ) );
if ( !$fit ) {
// We can't really query-continue a random list.
// Return an insanely high value so
// $count < $limit is false
return 1E9;
}
$this->pageIDs[] = $row->page_id;
}
} else {
$resultPageSet->processDbRow( $row );
}
}
return $count;
}
/**
* @param $resultPageSet ApiPageSet
* @return void
*/
public function run( $resultPageSet = null ) {
$params = $this->extractRequestParams();
$result = $this->getResult();
$this->pageIDs = array();
$this->prepareQuery( wfRandom(), $params['limit'], $params['namespace'], $resultPageSet, $params['redirect'] );
$count = $this->runQuery( $resultPageSet );
if ( $count < $params['limit'] ) {
/* We got too few pages, we probably picked a high value
* for page_random. We'll just take the lowest ones, see
* also the comment in Title::getRandomTitle()
*/
$this->prepareQuery( 0, $params['limit'] - $count, $params['namespace'], $resultPageSet, $params['redirect'] );
$this->runQuery( $resultPageSet );
}
if ( is_null( $resultPageSet ) ) {
$result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'page' );
}
}
private function extractRowInfo( $row ) {
$title = Title::makeTitle( $row->page_namespace, $row->page_title );
$vals = array();
$vals['id'] = intval( $row->page_id );
ApiQueryBase::addTitleInfo( $vals, $title );
return $vals;
}
public function getCacheMode( $params ) {
return 'public';
}
public function getAllowedParams() {
return array(
'namespace' => array(
ApiBase::PARAM_TYPE => 'namespace',
ApiBase::PARAM_ISMULTI => true
),
'limit' => array(
ApiBase::PARAM_TYPE => 'limit',
ApiBase::PARAM_DFLT => 1,
ApiBase::PARAM_MIN => 1,
ApiBase::PARAM_MAX => 10,
ApiBase::PARAM_MAX2 => 20
),
'redirect' => false,
);
}
public function getParamDescription() {
return array(
'namespace' => 'Return pages in these namespaces only',
'limit' => 'Limit how many random pages will be returned',
'redirect' => 'Load a random redirect instead of a random page'
);
}
public function getResultProperties() {
return array(
'' => array(
'id' => 'integer',
'ns' => 'namespace',
'title' => 'string'
)
);
}
public function getDescription() {
return array(
'Get a set of random pages',
'NOTE: Pages are listed in a fixed sequence, only the starting point is random. This means that if, for example, "Main Page" is the first ',
' random page on your list, "List of fictional monkeys" will *always* be second, "List of people on stamps of Vanuatu" third, etc',
'NOTE: If the number of pages in the namespace is lower than rnlimit, you will get fewer pages. You will not get the same page twice'
);
}
public function getExamples() {
return 'api.php?action=query&list=random&rnnamespace=0&rnlimit=2';
}
}
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