DockerCLI/vendor/k8s.io/apimachinery/pkg/apis/meta/v1/duration.go

/*
Copyright 2014 The Kubernetes Authors.

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 v1

import (
	"encoding/json"
	"time"
)

// Duration is a wrapper around time.Duration which supports correct
// marshaling to YAML and JSON. In particular, it marshals into strings, which
// can be used as map keys in json.
type Duration struct {
	time.Duration `protobuf:"varint,1,opt,name=duration,casttype=time.Duration"`
}

// UnmarshalJSON implements the json.Unmarshaller interface.
func (d *Duration) UnmarshalJSON(b []byte) error {
	var str string
	err := json.Unmarshal(b, &str)
	if err != nil {
		return err
	}

	pd, err := time.ParseDuration(str)
	if err != nil {
		return err
	}
	d.Duration = pd
	return nil
}

// MarshalJSON implements the json.Marshaler interface.
func (d Duration) MarshalJSON() ([]byte, error) {
	return json.Marshal(d.Duration.String())
}