/**
* get site object by site prefix
* @param string $prefix site prefix such as 'lotr'、'asoiaf'..
* @return object site object
*/
public static function newFromPrefix($prefix)
{
$siteCache = self::getSiteCache();
$site = $siteCache->get($prefix);
if ($site != '') {
return $site;
} else {
$site = new WikiSite();
$site->setPrefix($prefix);
$siteCache->set($prefix, $site);
return $site;
}
}
