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<?php
/*
* Created on Monday, January 28, 2008
*
* API for MediaWiki 1.8+
*
* Copyright (C) 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* http://www.gnu.org/copyleft/gpl.html
*/
if (!defined('MEDIAWIKI')) {
// Eclipse helper - will be ignored in production
require_once ('ApiQueryBase.php');
}
/**
* Query module to get list of random pages
*
* @ingroup API
*/
class ApiQueryRandom extends ApiQueryGeneratorBase {
public function __construct($query, $moduleName) {
parent :: __construct($query, $moduleName, 'rn');
}
public function execute() {
$this->run();
}
public function executeGenerator($resultPageSet) {
$this->run($resultPageSet);
}
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());
}
protected function runQuery(&$resultPageSet) {
$db = $this->getDB();
$res = $this->select(__METHOD__);
$count = 0;
while($row = $db->fetchObject($res)) {
$count++;
if(is_null($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);
}
$db->freeResult($res);
return $count;
}
public function run($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 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 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.'
);
}
protected function getExamples() {
return 'api.php?action=query&list=random&rnnamespace=0&rnlimit=2';
}
public function getVersion() {
return __CLASS__ . ': $Id: ApiQueryRandom.php overlordq$';
}
}
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