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conditional.go
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conditional.go
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// Copyright 2017 Amazon.com, Inc. or its affiliates. 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. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file 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 config
import (
"encoding/json"
"strconv"
)
// Conditional makes it possible to understand if a variable was set explicitly or relies on a default setting
type Conditional int
const (
_ Conditional = iota
ExplicitlyEnabled
ExplicitlyDisabled
DefaultEnabled
)
// Enabled is a convenience function for when consumers don't care if the value is implicit or explicit
func (b Conditional) Enabled() bool {
return b == ExplicitlyEnabled || b == DefaultEnabled
}
// MarshalJSON is used to serialize the type to json, per the Marshaller interface
func (b Conditional) MarshalJSON() ([]byte, error) {
switch b {
case ExplicitlyEnabled:
return json.Marshal(true)
case ExplicitlyDisabled:
return json.Marshal(false)
default:
return json.Marshal(nil)
}
}
// UnmarshalJSON is used to deserialize json types into Conditional, per the Unmarshaller interface
func (b *Conditional) UnmarshalJSON(jsonData []byte) error {
jsonString := string(jsonData)
jsonBool, err := strconv.ParseBool(jsonString)
if err != nil && jsonString != "null" {
return err
}
if jsonString == "" || jsonString == "null" {
*b = DefaultEnabled
} else if jsonBool {
*b = ExplicitlyEnabled
} else {
*b = ExplicitlyDisabled
}
return nil
}