influxdb/influxql/functions.gen.go.tmpl

package influxql

{{with $types := .}}{{range $k := $types}}

// {{$k.Name}}PointAggregator aggregates points to produce a single point.
type {{$k.Name}}PointAggregator interface {
	Aggregate(p *{{.Name}}Point)
}

// {{$k.Name}}PointEmitter produces a single point from an aggregate.
type {{$k.Name}}PointEmitter interface {
	Emit() *{{$k.Name}}Point
}

{{range $v := $types}}

// {{$k.Name}}Reduce{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Func is the function called by a {{$k.Name}}Point reducer.
type {{$k.Name}}Reduce{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Func func(prev *{{$v.Name}}Point, curr *{{$k.Name}}Point) (t int64, v {{$v.Type}}, aux []interface{})

type {{$k.Name}}Func{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Reducer struct {
	prev *{{$v.Name}}Point
	fn   {{$k.Name}}Reduce{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Func
}

func New{{$k.Name}}Func{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Reducer(fn {{$k.Name}}Reduce{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Func) *{{$k.Name}}Func{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Reducer {
	return &{{$k.Name}}Func{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Reducer{fn: fn}
}

func (r *{{$k.Name}}Func{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Reducer) Aggregate(p *{{$k.Name}}Point) {
	t, v, aux := r.fn(r.prev, p)
	if r.prev == nil {
		r.prev = &{{$v.Name}}Point{}
	}
  r.prev.Time = t
	r.prev.Value = v
	r.prev.Aux = aux
	r.prev.Aggregated++
}

func (r *{{$k.Name}}Func{{if ne $k.Name $v.Name}}{{$v.Name}}{{end}}Reducer) Emit() *{{$v.Name}}Point {
	return r.prev
}
{{end}}{{end}}{{end}}