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
	}