mirror of https://github.com/kubernetes/kops.git
107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package stringorslice
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import (
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"encoding/json"
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"strings"
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)
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// StringOrSlice is a type that holds a []string, but marshals to a []string or a string.
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type StringOrSlice struct {
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values []string
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forceEncodeAsArray bool
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}
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// Slice will build a value that marshals to a JSON array
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func Slice(v []string) StringOrSlice {
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return StringOrSlice{values: v, forceEncodeAsArray: true}
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}
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// Of will build a value that marshals to a JSON array if len(v) > 1,
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// otherwise to a single string
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func Of(v ...string) StringOrSlice {
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if v == nil {
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v = []string{}
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}
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return StringOrSlice{values: v}
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}
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// String will build a value that marshals to a single string
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func String(v string) StringOrSlice {
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return StringOrSlice{values: []string{v}, forceEncodeAsArray: false}
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}
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// UnmarshalJSON implements the json.Unmarshaller interface.
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func (s *StringOrSlice) UnmarshalJSON(value []byte) error {
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if value[0] == '[' {
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s.forceEncodeAsArray = true
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if err := json.Unmarshal(value, &s.values); err != nil {
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return nil
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}
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return nil
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}
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s.forceEncodeAsArray = false
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var stringValue string
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if err := json.Unmarshal(value, &stringValue); err != nil {
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return err
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}
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s.values = []string{stringValue}
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return nil
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}
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// String returns the string value, or the Itoa of the int value.
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func (s StringOrSlice) String() string {
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return strings.Join(s.values, ",")
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}
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func (v *StringOrSlice) Value() []string {
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return v.values
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}
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func (l StringOrSlice) Equal(r StringOrSlice) bool {
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if len(l.values) != len(r.values) {
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return false
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}
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for i := 0; i < len(l.values); i++ {
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if l.values[i] != r.values[i] {
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return false
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}
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}
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return true
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}
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// MarshalJSON implements the json.Marshaller interface.
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func (v StringOrSlice) MarshalJSON() ([]byte, error) {
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encodeAsJsonArray := v.forceEncodeAsArray
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if len(v.values) > 1 {
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encodeAsJsonArray = true
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}
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values := v.values
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if values == nil {
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values = []string{}
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}
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if encodeAsJsonArray {
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return json.Marshal(values)
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} else if len(v.values) == 1 {
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s := v.values[0]
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return json.Marshal(&s)
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} else {
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return json.Marshal(values)
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}
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}
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