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package proto
import "github.com/go-faster/errors"
// Compile-time assertions for ColNullable.
var (
_ ColInput = (*ColNullable[string])(nil)
_ ColResult = (*ColNullable[string])(nil)
_ Column = (*ColNullable[string])(nil)
_ ColumnOf[Nullable[string]] = (*ColNullable[string])(nil)
_ StateEncoder = (*ColNullable[string])(nil)
_ StateDecoder = (*ColNullable[string])(nil)
_ = ColNullable[string]{
Values: new(ColStr),
}
)
// Nullable is T value that can be null.
type Nullable[T any] struct {
Set bool
Value T
}
// NewNullable returns set value of Nullable[T] to v.
func NewNullable[T any](v T) Nullable[T] {
return Nullable[T]{Set: true, Value: v}
}
// Null returns null value for Nullable[T].
func Null[T any]() Nullable[T] {
return Nullable[T]{}
}
func (n Nullable[T]) IsSet() bool { return n.Set }
func (n Nullable[T]) Or(v T) T {
if n.Set {
return v
}
return n.Value
}
// NewColNullable returns new Nullable(T) from v column.
func NewColNullable[T any](v ColumnOf[T]) *ColNullable[T] {
return &ColNullable[T]{
Values: v,
}
}
// ColNullable represents Nullable(T) column.
//
// Nulls is nullable "mask" on Values column.
// For example, to encode [null, "", "hello", null, "world"]
//
// Values: ["", "", "hello", "", "world"] (len: 5)
// Nulls: [ 1, 0, 0, 1, 0] (len: 5)
//
// Values and Nulls row counts are always equal.
type ColNullable[T any] struct {
Nulls ColUInt8
Values ColumnOf[T]
}
func (c *ColNullable[T]) DecodeState(r *Reader) error {
if s, ok := c.Values.(StateDecoder); ok {
if err := s.DecodeState(r); err != nil {
return errors.Wrap(err, "values state")
}
}
return nil
}
func (c ColNullable[T]) EncodeState(b *Buffer) {
if s, ok := c.Values.(StateEncoder); ok {
s.EncodeState(b)
}
}
func (c ColNullable[T]) Type() ColumnType {
return ColumnTypeNullable.Sub(c.Values.Type())
}
func (c *ColNullable[T]) DecodeColumn(r *Reader, rows int) error {
if err := c.Nulls.DecodeColumn(r, rows); err != nil {
return errors.Wrap(err, "nulls")
}
if err := c.Values.DecodeColumn(r, rows); err != nil {
return errors.Wrap(err, "values")
}
return nil
}
func (c ColNullable[T]) Rows() int {
return c.Nulls.Rows()
}
func (c *ColNullable[T]) Append(v Nullable[T]) {
null := boolTrue
if v.Set {
null = boolFalse
}
c.Nulls.Append(null)
c.Values.Append(v.Value)
}
func (c *ColNullable[T]) AppendArr(v []Nullable[T]) {
for _, vv := range v {
c.Append(vv)
}
}
func (c ColNullable[T]) Row(i int) Nullable[T] {
return Nullable[T]{
Value: c.Values.Row(i),
Set: c.Nulls.Row(i) == boolFalse,
}
}
func (c *ColNullable[T]) Reset() {
c.Nulls.Reset()
c.Values.Reset()
}
func (c ColNullable[T]) EncodeColumn(b *Buffer) {
c.Nulls.EncodeColumn(b)
c.Values.EncodeColumn(b)
}
func (c ColNullable[T]) IsElemNull(i int) bool {
if i < c.Rows() {
return c.Nulls[i] == boolTrue
}
return false
}
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