revision.go

package apigee

import (
  "strconv"
  "strings"
  "fmt"
)

// Revision represents a revision number. Edge returns rev numbers in string form.
// This marshals and unmarshals between that format and int.
type Revision int

// MarshalJSON implements the json.Marshaler interface. It marshals from
// a Revision holding an integer value like 2, into a string like "2".
func (r *Revision) MarshalJSON() ([]byte, error) {
  rev := fmt.Sprintf("%d", r)
  return []byte(rev), nil
}

// UnmarshalJSON implements the json.Unmarshaler interface. It unmarshals from
// a string like "2" (including the quotes), into an integer 2.
func (r *Revision) UnmarshalJSON(b []byte) error {
  rev, e := strconv.ParseInt(strings.TrimSuffix(strings.TrimPrefix(string(b),"\""),"\""), 10, 32)
  if e != nil {
    return e
  }
  *r = Revision(rev)
  return nil
}

func (r Revision) String() string {
  return fmt.Sprintf("%d", r)
}