package feed

//go:generate stringer -linecomment -type=DataFormat

import (
  "encoding/json"
  "fmt"
)

// Data format for NVD feeds and feed items.
type DataFormat byte

const (
  MitreFormat DataFormat = iota // MITRE
)

// Unmarshal DataFormat from JSON.
func (me *DataFormat) UnmarshalJSON(b []byte) error {
  // decode string, check for error
  var s string
  if err := json.Unmarshal(b, &s); err != nil {
    return err
  }

  // check value
  switch s {
  case "MITRE":
    *me = MitreFormat
  default:
    // return error
    return fmt.Errorf("unknown data format: %s", s)
  }

  // return success
  return nil
}