135 lines
2.9 KiB
Go
135 lines
2.9 KiB
Go
package null
|
|
|
|
import (
|
|
"database/sql"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"reflect"
|
|
)
|
|
|
|
// Bool is a nullable bool.
|
|
// It does not consider false values to be null.
|
|
// It will decode to null, not false, if null.
|
|
type Bool struct {
|
|
sql.NullBool
|
|
}
|
|
|
|
// NewBool creates a new Bool
|
|
func NewBool(b bool, valid bool) Bool {
|
|
return Bool{
|
|
NullBool: sql.NullBool{
|
|
Bool: b,
|
|
Valid: valid,
|
|
},
|
|
}
|
|
}
|
|
|
|
// BoolFrom creates a new Bool that will always be valid.
|
|
func BoolFrom(b bool) Bool {
|
|
return NewBool(b, true)
|
|
}
|
|
|
|
// BoolFromPtr creates a new Bool that will be null if f is nil.
|
|
func BoolFromPtr(b *bool) Bool {
|
|
if b == nil {
|
|
return NewBool(false, false)
|
|
}
|
|
return NewBool(*b, true)
|
|
}
|
|
|
|
// ValueOrZero returns the inner value if valid, otherwise false.
|
|
func (b Bool) ValueOrZero() bool {
|
|
return b.Valid && b.Bool
|
|
}
|
|
|
|
// UnmarshalJSON implements json.Unmarshaler.
|
|
// It supports number and null input.
|
|
// 0 will not be considered a null Bool.
|
|
// It also supports unmarshalling a sql.NullBool.
|
|
func (b *Bool) UnmarshalJSON(data []byte) error {
|
|
var err error
|
|
var v interface{}
|
|
if err = json.Unmarshal(data, &v); err != nil {
|
|
return err
|
|
}
|
|
switch x := v.(type) {
|
|
case bool:
|
|
b.Bool = x
|
|
case map[string]interface{}:
|
|
err = json.Unmarshal(data, &b.NullBool)
|
|
case nil:
|
|
b.Valid = false
|
|
return nil
|
|
default:
|
|
err = fmt.Errorf("json: cannot unmarshal %v into Go value of type null.Bool", reflect.TypeOf(v).Name())
|
|
}
|
|
b.Valid = err == nil
|
|
return err
|
|
}
|
|
|
|
// UnmarshalText implements encoding.TextUnmarshaler.
|
|
// It will unmarshal to a null Bool if the input is a blank or not an integer.
|
|
// It will return an error if the input is not an integer, blank, or "null".
|
|
func (b *Bool) UnmarshalText(text []byte) error {
|
|
str := string(text)
|
|
switch str {
|
|
case "", "null":
|
|
b.Valid = false
|
|
return nil
|
|
case "true":
|
|
b.Bool = true
|
|
case "false":
|
|
b.Bool = false
|
|
default:
|
|
b.Valid = false
|
|
return errors.New("invalid input:" + str)
|
|
}
|
|
b.Valid = true
|
|
return nil
|
|
}
|
|
|
|
// MarshalJSON implements json.Marshaler.
|
|
// It will encode null if this Bool is null.
|
|
func (b Bool) MarshalJSON() ([]byte, error) {
|
|
if !b.Valid {
|
|
return []byte("null"), nil
|
|
}
|
|
if !b.Bool {
|
|
return []byte("false"), nil
|
|
}
|
|
return []byte("true"), nil
|
|
}
|
|
|
|
// MarshalText implements encoding.TextMarshaler.
|
|
// It will encode a blank string if this Bool is null.
|
|
func (b Bool) MarshalText() ([]byte, error) {
|
|
if !b.Valid {
|
|
return []byte{}, nil
|
|
}
|
|
if !b.Bool {
|
|
return []byte("false"), nil
|
|
}
|
|
return []byte("true"), nil
|
|
}
|
|
|
|
// SetValid changes this Bool's value and also sets it to be non-null.
|
|
func (b *Bool) SetValid(v bool) {
|
|
b.Bool = v
|
|
b.Valid = true
|
|
}
|
|
|
|
// Ptr returns a pointer to this Bool's value, or a nil pointer if this Bool is null.
|
|
func (b Bool) Ptr() *bool {
|
|
if !b.Valid {
|
|
return nil
|
|
}
|
|
return &b.Bool
|
|
}
|
|
|
|
// IsZero returns true for invalid Bools, for future omitempty support (Go 1.4?)
|
|
// A non-null Bool with a 0 value will not be considered zero.
|
|
func (b Bool) IsZero() bool {
|
|
return !b.Valid
|
|
}
|