/**
* Gets the value of a configuration field. If it is null or not set,
* throws an exception. Otherwise, it is guaranteed to return a non-null value.
* @method expect
* @static
* @param {string} $key1 The name of the first key in the configuration path
* @param {string} $key2 Optional. The name of the second key in the configuration path.
* You can actually pass as many keys as you need,
* delving deeper and deeper into the configuration structure.
* All but the second-to-last parameter are interpreted as keys.
* @return {mixed} Only returns non-null values
* @throws {Q_Exception_MissingConfig} May throw an exception if the config field is missing.
*/
static function expect($key1)
{
$args = func_get_args();
if (!isset(self::$tree)) {
self::$tree = new Q_Tree();
}
return call_user_func_array(array(self::$tree, __FUNCTION__), $args);
}
