uuid
2015-12-14
Parent:e0d83ad4145f
uuid/uuid.go
Fix build errors. Guess who screwed up and assumed UUID types were ID types? This guy. This corrects my mistake when casting to the underlying types to call the methods. Also, turns out the underlying type satisfies the Scan interface but not the Value interface, for whatever arbitrary reason. So reimplement our (very basic) Value interface.
1 package uuid
3 import (
4 "database/sql/driver"
5 "errors"
7 "github.com/pborman/uuid"
8 )
10 var InvalidIDError = errors.New("Invalid ID format.")
12 type ID uuid.UUID
14 func NewID() ID {
15 return ID(uuid.NewRandom())
16 }
18 func (id ID) String() string {
19 return uuid.UUID(id).String()
20 }
22 func (id ID) IsZero() bool {
23 if id == nil {
24 return true
25 }
26 if len(id) == 0 {
27 return true
28 }
29 return false
30 }
32 func (id ID) Copy() ID {
33 resp, _ := Parse(id.String())
34 // ignore the error because they asked for a copy of the ID, they
35 // never asked if it was valid or not.
36 // This is, overall, not the most efficient way to do this (we're
37 // essentially converting to a string and then back again) but the
38 // computational complexity involved is pretty minor, and it allows
39 // us to respect the boundaries between the packages, using only the
40 // exported interfaces to perform a copy. And that seems pretty
41 // valuable.
42 return resp
43 }
45 func (id ID) MarshalJSON() ([]byte, error) {
46 return uuid.UUID(id).MarshalJSON()
47 }
49 func (id ID) Value() (driver.Value, error) {
50 return id.String(), nil
51 }
53 func (id *ID) Scan(src interface{}) error {
54 return (*uuid.UUID)(id).Scan(src)
55 }
57 func (id *ID) UnmarshalJSON(in []byte) error {
58 return (*uuid.UUID)(id).UnmarshalJSON(in)
59 }
61 func Parse(in string) (ID, error) {
62 id := ID(uuid.Parse(in))
63 if id == nil {
64 return id, InvalidIDError
65 }
66 return id, nil
67 }
69 func (id ID) Equal(other ID) bool {
70 return uuid.Equal(uuid.UUID(id), uuid.UUID(other))
71 }