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enum.go
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enum.go
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// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package column
import (
"errors"
"math"
"strconv"
"strings"
)
func Enum(chType Type) (Interface, error) {
var (
payload string
columnType = string(chType)
)
if len(columnType) < 8 {
return nil, &Error{
ColumnType: string(chType),
Err: errors.New("invalid Enum"),
}
}
switch {
case strings.HasPrefix(columnType, "Enum8"):
payload = columnType[6:]
case strings.HasPrefix(columnType, "Enum16"):
payload = columnType[7:]
default:
return nil, &Error{
ColumnType: string(chType),
Err: errors.New("invalid Enum"),
}
}
var (
idents []string
indexes []int64
)
for _, block := range strings.Split(payload[:len(payload)-1], ",") {
parts := strings.Split(block, "=")
if len(parts) != 2 {
return nil, &Error{
ColumnType: string(chType),
Err: errors.New("invalid Enum"),
}
}
var (
ident = strings.TrimSpace(parts[0])
index, err = strconv.ParseInt(strings.TrimSpace(parts[1]), 10, 16)
)
if err != nil || len(ident) < 2 {
return nil, &Error{
ColumnType: string(chType),
Err: errors.New("invalid Enum"),
}
}
ident = ident[1 : len(ident)-1]
idents, indexes = append(idents, ident), append(indexes, index)
}
if strings.HasPrefix(columnType, "Enum8") {
enum := Enum8{
iv: make(map[string]uint8, len(idents)),
vi: make(map[uint8]string, len(idents)),
chType: chType,
}
for i := range idents {
if indexes[i] > math.MaxUint8 {
return nil, &Error{
ColumnType: string(chType),
Err: errors.New("invalid Enum"),
}
}
enum.iv[idents[i]] = uint8(indexes[i])
enum.vi[uint8(indexes[i])] = idents[i]
}
return &enum, nil
}
enum := Enum16{
iv: make(map[string]uint16, len(idents)),
vi: make(map[uint16]string, len(idents)),
chType: chType,
}
for i := range idents {
enum.iv[idents[i]] = uint16(indexes[i])
enum.vi[uint16(indexes[i])] = idents[i]
}
return &enum, nil
}