package trace

var (
	_ Tracer = nooptracer{}
)

type nooptracer struct{}

func (n nooptracer) New(title string, opts ...Option) Trace {
	return noopspan{}
}

func (n nooptracer) Inject(t Trace, format interface{}, carrier interface{}) error {
	return nil
}

func (n nooptracer) Extract(format interface{}, carrier interface{}) (Trace, error) {
	return noopspan{}, nil
}

type noopspan struct{}

func (n noopspan) Fork(string, string) Trace {
	return noopspan{}
}

func (n noopspan) Follow(string, string) Trace {
	return noopspan{}
}

func (n noopspan) Finish(err *error) {}

func (n noopspan) SetTag(tags ...Tag) Trace {
	return noopspan{}
}

func (n noopspan) SetLog(logs ...LogField) Trace {
	return noopspan{}
}

func (n noopspan) Visit(func(k, v string)) {}

func (n noopspan) SetTitle(string) {}

func (n noopspan) String() string { return "" }