/**
* Configure DI container.
*
* This method can only be safely used when the factory is a DI container
* (as the willUse method is not part of the T_Factory interface).
*
* @param string $class classname
* @param string $alias additional alias
*/
function willUse($class, $alias = null)
{
$this->env->willUse($class, $alias);
return $this;
}