141 lines
2.8 KiB
Go
141 lines
2.8 KiB
Go
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package column
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/kshvakov/clickhouse/lib/binary"
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)
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type Enum struct {
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iv map[string]interface{}
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vi map[interface{}]string
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base
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baseType interface{}
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}
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func (enum *Enum) Read(decoder *binary.Decoder) (interface{}, error) {
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var (
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err error
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ident interface{}
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)
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switch enum.baseType.(type) {
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case int16:
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if ident, err = decoder.Int16(); err != nil {
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return nil, err
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}
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default:
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if ident, err = decoder.Int8(); err != nil {
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return nil, err
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}
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}
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if ident, found := enum.vi[ident]; found {
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return ident, nil
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}
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return nil, fmt.Errorf("invalid Enum value: %v", ident)
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}
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func (enum *Enum) Write(encoder *binary.Encoder, v interface{}) error {
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switch v := v.(type) {
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case string:
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ident, found := enum.iv[v]
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if !found {
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return fmt.Errorf("invalid Enum ident: %s", v)
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}
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switch ident := ident.(type) {
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case int8:
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return encoder.Int8(ident)
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case int16:
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return encoder.Int16(ident)
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}
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case uint8:
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if _, ok := enum.baseType.(int8); ok {
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return encoder.Int8(int8(v))
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}
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case int8:
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if _, ok := enum.baseType.(int8); ok {
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return encoder.Int8(v)
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}
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case uint16:
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if _, ok := enum.baseType.(int16); ok {
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return encoder.Int16(int16(v))
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}
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case int16:
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if _, ok := enum.baseType.(int16); ok {
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return encoder.Int16(v)
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}
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case int64:
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switch enum.baseType.(type) {
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case int8:
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return encoder.Int8(int8(v))
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case int16:
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return encoder.Int16(int16(v))
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}
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}
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return &ErrUnexpectedType{
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T: v,
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Column: enum,
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}
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}
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func (enum *Enum) defaultValue() interface{} {
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return enum.baseType
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}
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func parseEnum(name, chType string) (*Enum, error) {
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var (
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data string
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isEnum16 bool
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)
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if len(chType) < 8 {
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return nil, fmt.Errorf("invalid Enum format: %s", chType)
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}
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switch {
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case strings.HasPrefix(chType, "Enum8"):
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data = chType[6:]
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case strings.HasPrefix(chType, "Enum16"):
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data = chType[7:]
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isEnum16 = true
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default:
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return nil, fmt.Errorf("'%s' is not Enum type", chType)
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}
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enum := Enum{
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base: base{
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name: name,
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chType: chType,
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valueOf: baseTypes[string("")],
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},
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iv: make(map[string]interface{}),
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vi: make(map[interface{}]string),
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}
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for _, block := range strings.Split(data[:len(data)-1], ",") {
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parts := strings.Split(block, "=")
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if len(parts) != 2 {
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return nil, fmt.Errorf("invalid Enum format: %s", chType)
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}
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var (
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ident = strings.TrimSpace(parts[0])
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value, err = strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 16)
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)
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if err != nil {
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return nil, fmt.Errorf("invalid Enum value: %v", chType)
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}
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{
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var (
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ident = ident[1 : len(ident)-1]
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value interface{} = int16(value)
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)
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if !isEnum16 {
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value = int8(value.(int16))
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}
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if enum.baseType == nil {
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enum.baseType = value
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}
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enum.iv[ident] = value
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enum.vi[value] = ident
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}
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}
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return &enum, nil
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}
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