mirror of https://github.com/kubernetes/kops.git
113 lines
2.8 KiB
Go
113 lines
2.8 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 stringorset
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import (
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"encoding/json"
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"sort"
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"strings"
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"k8s.io/apimachinery/pkg/util/sets"
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)
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// StringOrSet is a type that holds a []string, but marshals to a []string or a string.
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type StringOrSet struct {
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values sets.Set[string]
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forceEncodeAsArray bool
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}
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func (s *StringOrSet) IsEmpty() bool {
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return len(s.values) == 0
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}
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// Set will build a value that marshals to a JSON array
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func Set(v []string) StringOrSet {
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values := sets.Set[string]{}
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values.Insert(v...)
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return StringOrSet{values: values, 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) StringOrSet {
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if v == nil {
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v = []string{}
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}
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values := sets.Set[string]{}
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values.Insert(v...)
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return StringOrSet{values: values}
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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) StringOrSet {
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return StringOrSet{values: sets.New(v), forceEncodeAsArray: false}
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}
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// UnmarshalJSON implements the json.Unmarshaller interface.
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func (s *StringOrSet) UnmarshalJSON(value []byte) error {
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if value[0] == '[' {
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s.forceEncodeAsArray = true
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var vals []string
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if err := json.Unmarshal(value, &vals); err != nil {
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return nil
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}
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s.values = sets.New(vals...)
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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 = sets.New(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 StringOrSet) String() string {
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return strings.Join(sets.List[string](s.values), ",")
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}
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func (v *StringOrSet) Value() []string {
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vals := sets.List[string](v.values)
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sort.Strings(vals)
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return vals
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}
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func (l StringOrSet) Equal(r StringOrSet) bool {
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return l.values.Equal(r.values)
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}
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// MarshalJSON implements the json.Marshaller interface.
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func (v StringOrSet) 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.Value()
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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(values) == 1 {
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return json.Marshal(&values[0])
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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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