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62 lines
1.6 KiB
62 lines
1.6 KiB
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package mysql
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import (
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"strconv"
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"strings"
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"github.com/juju/errors"
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)
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// Enum is for MySQL enum type.
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type Enum struct {
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Name string
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Value uint64
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}
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// String implements fmt.Stringer interface.
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func (e Enum) String() string {
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return e.Name
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}
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// ToNumber changes enum index to float64 for numeric operation.
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func (e Enum) ToNumber() float64 {
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return float64(e.Value)
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}
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// ParseEnumName creates a Enum with item name.
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func ParseEnumName(elems []string, name string) (Enum, error) {
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for i, n := range elems {
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if strings.EqualFold(n, name) {
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return Enum{Name: n, Value: uint64(i) + 1}, nil
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}
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}
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// name doesn't exist, maybe an integer?
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if num, err := strconv.ParseUint(name, 0, 64); err == nil {
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return ParseEnumValue(elems, num)
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}
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return Enum{}, errors.Errorf("item %s is not in enum %v", name, elems)
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}
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// ParseEnumValue creates a Enum with special number.
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func ParseEnumValue(elems []string, number uint64) (Enum, error) {
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if number == 0 || number > uint64(len(elems)) {
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return Enum{}, errors.Errorf("number %d overflow enum boundary [1, %d]", number, len(elems))
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}
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return Enum{Name: elems[number-1], Value: number}, nil
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}
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