github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/api/unversioned/duration.go (about)

     1  /*
     2  Copyright 2014 The Kubernetes Authors All rights reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package unversioned
    18  
    19  import (
    20  	"encoding/json"
    21  	"time"
    22  )
    23  
    24  // Duration is a wrapper around time.Duration which supports correct
    25  // marshaling to YAML and JSON. In particular, it marshals into strings, which
    26  // can be used as map keys in json.
    27  type Duration struct {
    28  	time.Duration
    29  }
    30  
    31  // UnmarshalJSON implements the json.Unmarshaller interface.
    32  func (d *Duration) UnmarshalJSON(b []byte) error {
    33  	var str string
    34  	json.Unmarshal(b, &str)
    35  
    36  	pd, err := time.ParseDuration(str)
    37  	if err != nil {
    38  		return err
    39  	}
    40  	d.Duration = pd
    41  	return nil
    42  }
    43  
    44  // MarshalJSON implements the json.Marshaler interface.
    45  func (d Duration) MarshalJSON() ([]byte, error) {
    46  	return json.Marshal(d.String())
    47  }