github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/util/bool_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 import ( 20 "fmt" 21 "strconv" 22 ) 23 24 // BoolFlag is a boolean flag compatible with flags and pflags that keeps track of whether it had a value supplied or not. 25 // Beware! If you use this type, you must actually specify --flag-name=true, you cannot leave it as --flag-name and still have 26 // the value set 27 type BoolFlag struct { 28 // If Set has been invoked this value is true 29 provided bool 30 // The exact value provided on the flag 31 value bool 32 } 33 34 func (f *BoolFlag) Default(value bool) { 35 f.value = value 36 } 37 38 func (f BoolFlag) String() string { 39 return fmt.Sprintf("%t", f.value) 40 } 41 42 func (f BoolFlag) Value() bool { 43 return f.value 44 } 45 46 func (f *BoolFlag) Set(value string) error { 47 boolVal, err := strconv.ParseBool(value) 48 if err != nil { 49 return err 50 } 51 52 f.value = boolVal 53 f.provided = true 54 55 return nil 56 } 57 58 func (f BoolFlag) Provided() bool { 59 return f.provided 60 } 61 62 func (f *BoolFlag) Type() string { 63 return "bool" 64 }