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int32orstring.go
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int32orstring.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"
"fmt"
"strconv"
)
// Int32OrString is a type that can hold an int32 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 Int32OrString struct {
Type NumOrStringType
NumVal int32
StrVal string
}
// UnmarshalJSON implements the json.Unmarshaller interface.
func (i *Int32OrString) UnmarshalJSON(b []byte) error {
if b[0] == '"' {
i.Type = NumOrStringString
return json.Unmarshal(b, &i.StrVal)
}
i.Type = NumOrStringNum
return json.Unmarshal(b, &i.NumVal)
}
// String returns the string value, or the Itoa of the int value.
func (i *Int32OrString) String() string {
if i.Type == NumOrStringString {
return i.StrVal
}
return strconv.Itoa(int(i.NumVal))
}
// NumValue returns the NumVal if type Int, or if
// it is a String, will attempt a conversion to int.
func (i *Int32OrString) NumValue() (int, error) {
if i.Type == NumOrStringString {
return strconv.Atoi(i.StrVal)
}
return int(i.NumVal), nil
}
// MarshalJSON implements the json.Marshaller interface.
func (i Int32OrString) MarshalJSON() ([]byte, error) {
switch i.Type {
case NumOrStringNum:
return json.Marshal(i.NumVal)
case NumOrStringString:
return json.Marshal(i.StrVal)
default:
return []byte{}, fmt.Errorf("impossible Int32OrString.Type")
}
}