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map_options.go
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map_options.go
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// Copyright 2016-2017 Authors of Cilium
//
// 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 option
import (
"fmt"
"strings"
)
// Validator returns a validated string along with a possible error.
type Validator func(val string) (string, error)
// MapOptions holds a map of values and a validation function.
type MapOptions struct {
vals map[string]string
validator Validator
}
// NamedMapOptions is a MapOptions struct with a configuration name.
// This struct is useful to keep reference to the assigned
// field name in the internal configuration struct.
type NamedMapOptions struct {
name string
MapOptions
}
// NewNamedMapOptions creates a reference to a new NamedMapOpts struct.
func NewNamedMapOptions(name string, values *map[string]string, validator Validator) *NamedMapOptions {
return &NamedMapOptions{
name: name,
MapOptions: *NewMapOpts(*values, validator),
}
}
// NewMapOpts creates a new MapOpts with the specified map of values and an
// optional validator.
func NewMapOpts(values map[string]string, validator Validator) *MapOptions {
if values == nil {
values = make(map[string]string)
}
return &MapOptions{
vals: values,
validator: validator,
}
}
func (opts *MapOptions) String() string {
return fmt.Sprintf("%v", opts.vals)
}
// Type returns a string name for this Option type
func (opts *MapOptions) Type() string {
return "map"
}
// Set validates, if needed, the input value and adds it to the internal map,
// by splitting on '='.
func (opts *MapOptions) Set(value string) error {
if opts.validator != nil {
v, err := opts.validator(value)
if err != nil {
return err
}
value = v
}
vals := strings.SplitN(value, "=", 2)
if len(vals) == 1 {
(opts.vals)[vals[0]] = ""
} else {
(opts.vals)[vals[0]] = vals[1]
}
return nil
}