github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/util/string_flag.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 util
    18  
    19  // StringFlag is a string flag compatible with flags and pflags that keeps track of whether it had a value supplied or not.
    20  type StringFlag struct {
    21  	// If Set has been invoked this value is true
    22  	provided bool
    23  	// The exact value provided on the flag
    24  	value string
    25  }
    26  
    27  func NewStringFlag(defaultVal string) StringFlag {
    28  	return StringFlag{value: defaultVal}
    29  }
    30  
    31  func (f *StringFlag) Default(value string) {
    32  	f.value = value
    33  }
    34  
    35  func (f StringFlag) String() string {
    36  	return f.value
    37  }
    38  
    39  func (f StringFlag) Value() string {
    40  	return f.value
    41  }
    42  
    43  func (f *StringFlag) Set(value string) error {
    44  	f.value = value
    45  	f.provided = true
    46  
    47  	return nil
    48  }
    49  
    50  func (f StringFlag) Provided() bool {
    51  	return f.provided
    52  }
    53  
    54  func (f *StringFlag) Type() string {
    55  	return "string"
    56  }