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uint8orstring.go
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uint8orstring.go
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// Copyright (c) 2016 Tigera, Inc. All rights reserved.
// Licensed 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 numorstring
import (
"encoding/json"
"strconv"
)
// UInt8OrString is a type that can hold an uint8 or a string. When used in
// JSON or YAML marshalling and unmarshalling, it produces or consumes the
// inner type. This allows you to have, for example, a JSON field that can
// accept a name or number.
type Uint8OrString struct {
Type NumOrStringType
NumVal uint8
StrVal string
}
// UnmarshalJSON implements the json.Unmarshaller interface.
func (i *Uint8OrString) UnmarshalJSON(b []byte) error {
if b[0] == '"' {
var s string
if err := json.Unmarshal(b, &s); err != nil {
return err
}
num, err := strconv.ParseUint(s, 10, 8)
if err == nil {
i.Type = NumOrStringNum
i.NumVal = uint8(num)
} else {
i.Type = NumOrStringString
i.StrVal = s
}
return nil
}
i.Type = NumOrStringNum
return json.Unmarshal(b, &i.NumVal)
}
// MarshalJSON implements the json.Marshaller interface.
func (i Uint8OrString) MarshalJSON() ([]byte, error) {
if num, err := i.NumValue(); err == nil {
return json.Marshal(num)
} else {
return json.Marshal(i.StrVal)
}
}
// String returns the string value, or the Itoa of the int value.
func (i Uint8OrString) String() string {
if i.Type == NumOrStringString {
return i.StrVal
}
return strconv.FormatUint(uint64(i.NumVal), 10)
}
// NumValue returns the NumVal if type Int, or if
// it is a String, will attempt a conversion to int.
func (i Uint8OrString) NumValue() (uint8, error) {
if i.Type == NumOrStringString {
num, err := strconv.ParseUint(i.StrVal, 10, 8)
return uint8(num), err
}
return i.NumVal, nil
}