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strset.go
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strset.go
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// Copyright 2015 realglobe, Inc.
//
// 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.
// JSON にしたときに配列になる文字列集合のラッパー。
package strset
import (
"encoding/json"
"github.com/realglobe-Inc/go-lib/erro"
"gopkg.in/mgo.v2/bson"
)
type Set map[string]bool
func (this Set) MarshalJSON() ([]byte, error) {
if this == nil {
return json.Marshal(nil)
}
a := []string{}
for elem, ok := range this {
if ok {
a = append(a, elem)
}
}
return json.Marshal(a)
}
func (this *Set) UnmarshalJSON(data []byte) error {
var a []string
if err := json.Unmarshal(data, &a); err != nil {
return err
} else if a == nil {
return nil
}
s := map[string]bool{}
for _, elem := range a {
if s[elem] {
return erro.New("element " + elem + " overlaps")
}
s[elem] = true
}
*this = Set(s)
return nil
}
func (this Set) GetBSON() (interface{}, error) {
if this == nil {
return nil, nil
}
a := []string{}
for elem, ok := range this {
if ok {
a = append(a, elem)
}
}
return a, nil
}
func (this *Set) SetBSON(raw bson.Raw) error {
var a []string
if err := raw.Unmarshal(&a); err != nil {
return err
} else if a == nil {
return nil
}
s := map[string]bool{}
for _, elem := range a {
if s[elem] {
return erro.New("element " + elem + " overlaps")
}
s[elem] = true
}
*this = Set(s)
return nil
}