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/
bitflags.go
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/
bitflags.go
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// Copyright 2015 The rkt 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 flag
import (
"errors"
"fmt"
"github.com/hashicorp/errwrap"
)
// BitFlags is a flag value type supporting a csv list of options stored as bits
type BitFlags struct {
*OptionList
Flags int
FlagMap map[string]int
}
// NewBitFlags initializes a simple bitflag version of the OptionList Type.
// flagMap is the mapping from option names to the integer value
func NewBitFlags(permissibleOptions []string, defaultOptions string, flagMap map[string]int) (*BitFlags, error) {
ol, err := NewOptionList(permissibleOptions, defaultOptions)
if err != nil {
return nil, err
}
bf := &BitFlags{
OptionList: ol,
FlagMap: flagMap,
}
bf.typeName = "BitFlags"
if err := bf.Set(defaultOptions); err != nil {
return nil, errwrap.Wrap(errors.New("problem setting defaults"), err)
}
return bf, nil
}
func (bf *BitFlags) Set(s string) error {
if err := bf.OptionList.Set(s); err != nil {
return err
}
bf.Flags = 0
for _, o := range bf.Options {
if b, ok := bf.FlagMap[o]; ok {
bf.Flags |= b
} else {
return fmt.Errorf("couldn't find flag for %v", o)
}
}
return nil
}
func (bf *BitFlags) HasFlag(f int) bool {
return (bf.Flags & f) == f
}