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fixed_string.go
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/
fixed_string.go
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package column
import (
"encoding"
"fmt"
"reflect"
"github.com/ClickHouse/clickhouse-go/v2/lib/binary"
)
type FixedString struct {
data []byte
size int
}
func (col *FixedString) parse(t Type) (*FixedString, error) {
if _, err := fmt.Sscanf(string(t), "FixedString(%d)", &col.size); err != nil {
return nil, err
}
return col, nil
}
func (col *FixedString) Type() Type {
return Type(fmt.Sprintf("FixedString(%d)", col.size))
}
func (col *FixedString) ScanType() reflect.Type {
return scanTypeString
}
func (col *FixedString) Rows() int {
if col.size == 0 {
return 0
}
return len(col.data) / col.size
}
func (col *FixedString) Row(i int, ptr bool) interface{} {
value := col.row(i)
if ptr {
return &value
}
return value
}
func (col *FixedString) ScanRow(dest interface{}, row int) error {
switch d := dest.(type) {
case *string:
*d = col.row(row)
case **string:
*d = new(string)
**d = col.row(row)
case encoding.BinaryUnmarshaler:
return d.UnmarshalBinary(col.rowBytes(row))
default:
return &ColumnConverterError{
Op: "ScanRow",
To: fmt.Sprintf("%T", dest),
From: "FixedString",
}
}
return nil
}
func (col *FixedString) Append(v interface{}) (nulls []uint8, err error) {
switch v := v.(type) {
case []string:
for _, v := range v {
if err := col.AppendRow(v); err != nil {
return nil, err
}
}
nulls = make([]uint8, len(v))
case []*string:
nulls = make([]uint8, len(v))
for i, v := range v {
if v == nil {
nulls[i] = 1
}
if err := col.AppendRow(v); err != nil {
return nil, err
}
}
case encoding.BinaryMarshaler:
data, err := v.MarshalBinary()
if err != nil {
return nil, err
}
if len(data)%col.size != 0 {
return nil, &Error{
ColumnType: string(col.Type()),
Err: fmt.Errorf("invalid size. expected %d got %d", col.size, len(data)),
}
}
col.data, nulls = append(col.data, data...), make([]uint8, len(data)/col.size)
default:
return nil, &ColumnConverterError{
Op: "Append",
To: "FixedString",
From: fmt.Sprintf("%T", v),
}
}
return
}
func (col *FixedString) AppendRow(v interface{}) (err error) {
data := make([]byte, col.size)
switch v := v.(type) {
case string:
data = []byte(v)
case *string:
if v != nil {
data = []byte(*v)
}
case nil:
case encoding.BinaryMarshaler:
if data, err = v.MarshalBinary(); err != nil {
return err
}
default:
return &ColumnConverterError{
Op: "AppendRow",
To: "FixedString",
From: fmt.Sprintf("%T", v),
}
}
if len(data) != col.size {
return &Error{
ColumnType: string(col.Type()),
Err: fmt.Errorf("invalid size. expected %d got %d", col.size, len(data)),
}
}
col.data = append(col.data, data...)
return nil
}
func (col *FixedString) Decode(decoder *binary.Decoder, rows int) error {
col.data = make([]byte, col.size*rows)
return decoder.Raw(col.data)
}
func (col *FixedString) Encode(encoder *binary.Encoder) error {
return encoder.Raw(col.data)
}
func (col *FixedString) row(i int) string {
return string(col.data[i*col.size : (i+1)*col.size])
}
func (col *FixedString) rowBytes(i int) []byte {
return col.data[i*col.size : (i+1)*col.size]
}
var _ Interface = (*FixedString)(nil)