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86 lines
1.8 KiB
86 lines
1.8 KiB
7 years ago
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/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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 condition
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import (
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"encoding/json"
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"fmt"
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)
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// ValueSet - unique list of values.
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type ValueSet map[Value]struct{}
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// Add - adds given value to value set.
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func (set ValueSet) Add(value Value) {
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set[value] = struct{}{}
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}
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// MarshalJSON - encodes ValueSet to JSON data.
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func (set ValueSet) MarshalJSON() ([]byte, error) {
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var values []Value
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for k := range set {
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values = append(values, k)
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}
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if len(values) == 0 {
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return nil, fmt.Errorf("invalid value set %v", set)
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}
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return json.Marshal(values)
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}
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// UnmarshalJSON - decodes JSON data.
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func (set *ValueSet) UnmarshalJSON(data []byte) error {
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var v Value
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if err := json.Unmarshal(data, &v); err == nil {
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*set = make(ValueSet)
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set.Add(v)
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return nil
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}
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var values []Value
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if err := json.Unmarshal(data, &values); err != nil {
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return err
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}
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if len(values) < 1 {
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return fmt.Errorf("invalid value")
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}
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*set = make(ValueSet)
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for _, v = range values {
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if _, found := (*set)[v]; found {
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return fmt.Errorf("duplicate value found '%v'", v)
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}
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set.Add(v)
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}
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return nil
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}
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// NewValueSet - returns new value set containing given values.
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func NewValueSet(values ...Value) ValueSet {
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set := make(ValueSet)
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for _, value := range values {
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set.Add(value)
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}
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return set
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}
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