/**
* Try to get the sitemap from cache
*
* @param string $type Sitemap type.
* @param int $page_number The page number to retrieve.
*
* @return bool If the sitemap has been retrieved from cache.
*/
private function get_sitemap_from_cache($type, $page_number)
{
$this->transient = false;
if (true !== $this->cache->is_enabled()) {
return false;
}
/**
* Fires before the attempt to retrieve XML sitemap from the transient cache.
*
* @param WPSEO_Sitemaps $sitemaps Sitemaps object.
*/
do_action('wpseo_sitemap_stylesheet_cache_' . $type, $this);
$sitemap_cache_data = $this->cache->get_sitemap_data($type, $page_number);
// No cache was found, refresh it because cache is enabled.
if (empty($sitemap_cache_data)) {
return $this->refresh_sitemap_cache($type, $page_number);
}
// Cache object was found, parse information.
$this->transient = true;
$this->sitemap = $sitemap_cache_data->get_sitemap();
$this->bad_sitemap = !$sitemap_cache_data->is_usable();
return true;
}
/**
* Setup context for static calls.
*/
public function init()
{
self::$is_enabled = $this->is_enabled();
}