return null;
}
@Override
public HandlerWrapper build(final Map<String, Object> config) {
final ExchangeAttribute value = (ExchangeAttribute) config.get("value");
final ExchangeAttribute attribute = (ExchangeAttribute) config.get("attribute");
return new HandlerWrapper() {
@Override
public HttpHandler wrap(HttpHandler handler) {
return new SetAttributeHandler(handler, attribute, value);