module MultiJson

def load_adapter(new_adapter)
  case new_adapter
  when String, Symbol
    load_adapter_from_string_name new_adapter.to_s
  when NilClass, FalseClass
    load_adapter default_adapter
  when Class, Module
    new_adapter
  else
    fail ::LoadError, new_adapter
  end
rescue ::LoadError => exception
  raise AdapterError.build(exception)
end