/**
*
* @param string $interface
* @param nc_search_context $context
* @return nc_search_extension_chain с экземплярами классов расширения, подходящих под данный контекст
* @throws nc_search_exception
*/
public static function get($interface, nc_search_context $context)
{
$cache_id = $interface . "__" . $context->get_hash();
if (isset(self::$cache[$cache_id])) {
return self::$cache[$cache_id];
}
$result = new nc_search_extension_chain();
foreach (self::get_all_extensions() as $rule) {
if ($rule->get('extension_interface') == $interface && $context->conforms_to($rule)) {
$extension_class = $rule->get('extension_class');
$extension_instance = new $extension_class($context);
if (!$extension_instance instanceof $interface) {
// WTF? Implement an interface!
throw new nc_search_exception("Extension '{$extension_class}' does not implement the interface '{$interface}'");
}
$result->add($extension_instance);
}
}
self::$cache[$cache_id] = $result;
return $result;
}
