1// Copyright (C) 2013-2018 by Maxim Bublis <b@codemonkey.ru>
 2//
 3// Permission is hereby granted, free of charge, to any person obtaining
 4// a copy of this software and associated documentation files (the
 5// "Software"), to deal in the Software without restriction, including
 6// without limitation the rights to use, copy, modify, merge, publish,
 7// distribute, sublicense, and/or sell copies of the Software, and to
 8// permit persons to whom the Software is furnished to do so, subject to
 9// the following conditions:
10//
11// The above copyright notice and this permission notice shall be
12// included in all copies or substantial portions of the Software.
13//
14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
17// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
18// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
19// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
20// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22package uuid
23
24import (
25	"database/sql/driver"
26	"fmt"
27)
28
29// Value implements the driver.Valuer interface.
30func (u UUID) Value() (driver.Value, error) {
31	return u.String(), nil
32}
33
34// Scan implements the sql.Scanner interface.
35// A 16-byte slice is handled by UnmarshalBinary, while
36// a longer byte slice or a string is handled by UnmarshalText.
37func (u *UUID) Scan(src interface{}) error {
38	switch src := src.(type) {
39	case []byte:
40		if len(src) == Size {
41			return u.UnmarshalBinary(src)
42		}
43		return u.UnmarshalText(src)
44
45	case string:
46		return u.UnmarshalText([]byte(src))
47	}
48
49	return fmt.Errorf("uuid: cannot convert %T to UUID", src)
50}
51
52// NullUUID can be used with the standard sql package to represent a
53// UUID value that can be NULL in the database
54type NullUUID struct {
55	UUID  UUID
56	Valid bool
57}
58
59// Value implements the driver.Valuer interface.
60func (u NullUUID) Value() (driver.Value, error) {
61	if !u.Valid {
62		return nil, nil
63	}
64	// Delegate to UUID Value function
65	return u.UUID.Value()
66}
67
68// Scan implements the sql.Scanner interface.
69func (u *NullUUID) Scan(src interface{}) error {
70	if src == nil {
71		u.UUID, u.Valid = Nil, false
72		return nil
73	}
74
75	// Delegate to UUID Scan function
76	u.Valid = true
77	return u.UUID.Scan(src)
78}