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113 lines
2.2 KiB
Go
113 lines
2.2 KiB
Go
// Copyright (c) 2015, Emir Pasic. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package linkedhashmap
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import (
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"bytes"
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"encoding/json"
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"github.com/emirpasic/gods/containers"
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"github.com/emirpasic/gods/utils"
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)
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// Assert Serialization implementation
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var _ containers.JSONSerializer = (*Map)(nil)
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var _ containers.JSONDeserializer = (*Map)(nil)
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// ToJSON outputs the JSON representation of map.
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func (m *Map) ToJSON() ([]byte, error) {
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var b []byte
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buf := bytes.NewBuffer(b)
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buf.WriteRune('{')
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it := m.Iterator()
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lastIndex := m.Size() - 1
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index := 0
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for it.Next() {
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km, err := json.Marshal(it.Key())
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if err != nil {
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return nil, err
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}
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buf.Write(km)
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buf.WriteRune(':')
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vm, err := json.Marshal(it.Value())
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if err != nil {
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return nil, err
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}
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buf.Write(vm)
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if index != lastIndex {
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buf.WriteRune(',')
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}
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index++
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}
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buf.WriteRune('}')
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return buf.Bytes(), nil
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}
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// FromJSON populates map from the input JSON representation.
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//func (m *Map) FromJSON(data []byte) error {
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// elements := make(map[string]interface{})
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// err := json.Unmarshal(data, &elements)
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// if err == nil {
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// m.Clear()
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// for key, value := range elements {
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// m.Put(key, value)
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// }
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// }
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// return err
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//}
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// FromJSON populates map from the input JSON representation.
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func (m *Map) FromJSON(data []byte) error {
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elements := make(map[string]interface{})
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err := json.Unmarshal(data, &elements)
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if err != nil {
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return err
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}
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index := make(map[string]int)
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var keys []interface{}
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for key := range elements {
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keys = append(keys, key)
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esc, _ := json.Marshal(key)
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index[key] = bytes.Index(data, esc)
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}
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byIndex := func(a, b interface{}) int {
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key1 := a.(string)
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key2 := b.(string)
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index1 := index[key1]
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index2 := index[key2]
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return index1 - index2
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}
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utils.Sort(keys, byIndex)
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m.Clear()
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for _, key := range keys {
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m.Put(key, elements[key.(string)])
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}
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return nil
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}
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// UnmarshalJSON @implements json.Unmarshaler
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func (m *Map) UnmarshalJSON(bytes []byte) error {
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return m.FromJSON(bytes)
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}
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// MarshalJSON @implements json.Marshaler
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func (m *Map) MarshalJSON() ([]byte, error) {
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return m.ToJSON()
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}
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