carpool-service/interoperability/ocss/prices.go

package ocss

import (
	"bytes"
	"encoding/json"
)

type PriceType int64

const (
	Free PriceType = iota
	Paying
	Unknown
)

var priceTypeToID = map[string]PriceType{
	"FREE":    Free,
	"PAYING":  Paying,
	"UNKNOWN": Unknown,
}

var priceTypeToString = map[PriceType]string{
	Free:    "FREE",
	Paying:  "PAYING",
	Unknown: "UNKNOWN",
}

func (s PriceType) MarshalJSON() ([]byte, error) {
	buffer := bytes.NewBufferString(`"`)
	buffer.WriteString(priceTypeToString[s])
	buffer.WriteString(`"`)
	return buffer.Bytes(), nil
}

func (bs *PriceType) UnmarshalJSON(b []byte) error {
	var j string
	err := json.Unmarshal(b, &j)
	if err != nil {
		return err
	}
	// Note that if the string cannot be found then it will be set to the zero value, 'Created' in this case.
	*bs = priceTypeToID[j]
	return nil
}

type Price struct {
	Type     *PriceType `json:"type,omitempty"`
	Amount   *float64   `json:"amount,omitempty"`
	Currency *string    `json:"currency,omitempty"`
}