WP_Feed_Cache

class WP_Feed_Cache extends SimplePie_Cache {

	/**
	 * Creates a new SimplePie_Cache object.
	 *
	 * @since WP-2.8.0
	 *
	 * @param string $location  URL location (scheme is used to determine handler).
	 * @param string $filename  Unique identifier for cache object.
	 * @param string $extension 'spi' or 'spc'.
	 * @return WP_Feed_Cache_Transient Feed cache handler object that uses transients.
	 */
	public function create($location, $filename, $extension) {
		return new WP_Feed_Cache_Transient($location, $filename, $extension);
	}
}