return &Builder{builder: b}
}

func (b *Builder) BuildTCP() []*listener.Filter {
	if b == nil || b.builder == nil {
		return nil
	}
	if b.tcpBuilt {
		return b.tcpFilters
	}
	b.tcpBuilt = true
	b.tcpFilters = b.builder.BuildTCP()

	return b.tcpFilters
}

func (b *Builder) BuildHTTP(class networking.ListenerClass) []*hcm.HttpFilter {
	if b == nil || b.builder == nil {
		return nil
	}

	if res := t.telemetryFilters(proxy, class, networking.ListenerProtocolHTTP, svc); res != nil {
		return res.([]*hcm.HttpFilter)
	}
	return nil
}

// TCPFilters computes the TCPFilters for a given proxy/class
func (t *Telemetries) TCPFilters(proxy *Proxy, class networking.ListenerClass, svc *Service) []*listener.Filter {
	if res := t.telemetryFilters(proxy, class, networking.ListenerProtocolTCP, svc); res != nil {

	}

	return filterstack
}

func buildMetricsNetworkFilters(push *model.PushContext, proxy *model.Proxy, class istionetworking.ListenerClass, svc *model.Service) []*listener.Filter {
	return push.Telemetry.TCPFilters(proxy, class, svc)
}

// setAccessLogAndBuildTCPFilter sets the AccessLog configuration in the given
// TcpProxy instance and builds a TCP filter out of it.