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string.go
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114 lines (101 loc) · 1.99 KB
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package nulled
import (
"bytes"
"encoding/gob"
"encoding/json"
"net/url"
"strings"
"gopkg.in/guregu/null.v4"
)
type String null.String
func NewString(s string, valid bool) String {
return String(null.NewString(s, valid))
}
func StringFrom(s string) String {
s = strings.TrimSpace(s)
if s == "" {
return NewString("", false)
}
return NewString(s, true)
}
func StringFromPtr(s *string) String {
if s == nil {
return NewString("", false)
}
return StringFrom(*s)
}
func (m String) ValueOrZero() string {
if !m.Valid {
return ""
}
return m.String
}
func (m String) EncodeValues(key string, v *url.Values) error {
if !m.Valid || strings.TrimSpace(m.String) == "" {
return nil
}
v.Set(key, m.String)
return nil
}
func (m String) MarshalJSON() ([]byte, error) {
if !m.Valid {
return []byte("null"), nil
}
return json.Marshal(m.String)
}
func (m *String) UnmarshalJSON(data []byte) error {
var s *string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
if s == nil {
m.Valid = false
m.String = ""
} else {
// an empty string is considered null
m.Valid = *s != ""
m.String = *s
}
return nil
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
func (m *String) UnmarshalText(text []byte) error {
s := string(text)
// an empty string is considered null
if s == "" {
m.Valid = false
m.String = ""
} else {
m.Valid = true
m.String = s
}
return nil
}
func (m String) GobEncode() ([]byte, error) {
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
err := enc.Encode(m.String)
if err != nil {
return nil, err
}
err = enc.Encode(m.Valid)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (m *String) GobDecode(data []byte) error {
buf := bytes.NewBuffer(data)
dec := gob.NewDecoder(buf)
err := dec.Decode(&m.String)
if err != nil {
return err
}
return dec.Decode(&m.Valid)
}
func (m String) NullValue() null.String {
if m.Valid {
return null.StringFrom(m.String)
}
return null.NewString("", false)
}