mirror of https://github.com/jetkvm/kvm.git
116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
package null
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import (
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"database/sql"
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"strconv"
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"github.com/guregu/null/v6/internal"
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)
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// Int32 is an nullable int32.
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// It does not consider zero values to be null.
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// It will decode to null, not zero, if null.
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type Int32 struct {
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sql.NullInt32
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}
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// NewInt32 creates a new Int32.
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func NewInt32(i int32, valid bool) Int32 {
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return Int32{
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NullInt32: sql.NullInt32{
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Int32: i,
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Valid: valid,
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},
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}
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}
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// Int32From creates a new Int32 that will always be valid.
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func Int32From(i int32) Int32 {
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return NewInt32(i, true)
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}
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// Int32FromPtr creates a new Int32 that be null if i is nil.
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func Int32FromPtr(i *int32) Int32 {
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if i == nil {
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return NewInt32(0, false)
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}
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return NewInt32(*i, true)
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}
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// ValueOrZero returns the inner value if valid, otherwise zero.
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func (i Int32) ValueOrZero() int32 {
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if !i.Valid {
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return 0
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}
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return i.Int32
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}
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// ValueOr returns the inner value if valid, otherwise v.
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func (i Int32) ValueOr(v int32) int32 {
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if !i.Valid {
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return v
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}
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return i.Int32
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}
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// UnmarshalJSON implements json.Unmarshaler.
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// It supports number, string, and null input.
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// 0 will not be considered a null Int32.
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func (i *Int32) UnmarshalJSON(data []byte) error {
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return internal.UnmarshalIntJSON(data, &i.Int32, &i.Valid, 32, strconv.ParseInt)
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}
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// UnmarshalText implements encoding.TextUnmarshaler.
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// It will unmarshal to a null Int32 if the input is blank.
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// It will return an error if the input is not an integer, blank, or "null".
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func (i *Int32) UnmarshalText(text []byte) error {
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return internal.UnmarshalIntText(text, &i.Int32, &i.Valid, 32, strconv.ParseInt)
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}
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// MarshalJSON implements json.Marshaler.
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// It will encode null if this Int32 is null.
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func (i Int32) MarshalJSON() ([]byte, error) {
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if !i.Valid {
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return []byte("null"), nil
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}
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return []byte(strconv.FormatInt(int64(i.Int32), 10)), 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 Int32 is null.
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func (i Int32) MarshalText() ([]byte, error) {
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if !i.Valid {
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return []byte{}, nil
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}
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return []byte(strconv.FormatInt(int64(i.Int32), 10)), nil
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}
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// SetValid changes this Int32's value and also sets it to be non-null.
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func (i *Int32) SetValid(n int32) {
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i.Int32 = n
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i.Valid = true
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}
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// Ptr returns a pointer to this Int32's value, or a nil pointer if this Int32 is null.
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func (i Int32) Ptr() *int32 {
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if !i.Valid {
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return nil
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}
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return &i.Int32
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}
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// IsZero returns true for invalid Int32s, for future omitempty support (Go 1.4?)
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// A non-null Int32 with a 0 value will not be considered zero.
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func (i Int32) IsZero() bool {
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return !i.Valid
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}
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// Equal returns true if both ints have the same value or are both null.
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func (i Int32) Equal(other Int32) bool {
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return i.Valid == other.Valid && (!i.Valid || i.Int32 == other.Int32)
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}
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func (i Int32) value() (int64, bool) {
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return int64(i.Int32), i.Valid
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}
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