gen/writers/metadata.go
func location(p *gen.ActionParam) string {
	switch p.Location {
	case gen.PathParam:
		return "metadata.PathParam"
	case gen.QueryParam:
		return "metadata.QueryParam"
	case gen.PayloadParam:
		return "metadata.PayloadParam"
	default:
		return ""
	}
}
func location(p *gen.ActionParam) string {
	switch p.Location {
	case gen.PathParam:
		return "metadata.PathParam"
	case gen.QueryParam:
		return "metadata.QueryParam"
	case gen.PayloadParam:
		return "metadata.PayloadParam"
	default:
		return ""
	}
}
// Return code corresponding to param location