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