1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
// Copyright (C) MongoDB, Inc. 2017-present.
//
// 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
package bsoncodec
import (
"fmt"
"reflect"
"go.mongodb.org/mongo-driver/bson/bsonoptions"
"go.mongodb.org/mongo-driver/bson/bsonrw"
"go.mongodb.org/mongo-driver/bson/bsontype"
)
// StringCodec is the Codec used for struct values.
type StringCodec struct {
DecodeObjectIDAsHex bool
}
var (
defaultStringCodec = NewStringCodec()
_ ValueCodec = defaultStringCodec
_ typeDecoder = defaultStringCodec
)
// NewStringCodec returns a StringCodec with options opts.
func NewStringCodec(opts ...*bsonoptions.StringCodecOptions) *StringCodec {
stringOpt := bsonoptions.MergeStringCodecOptions(opts...)
return &StringCodec{*stringOpt.DecodeObjectIDAsHex}
}
// EncodeValue is the ValueEncoder for string types.
func (sc *StringCodec) EncodeValue(ectx EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error {
if val.Kind() != reflect.String {
return ValueEncoderError{
Name: "StringEncodeValue",
Kinds: []reflect.Kind{reflect.String},
Received: val,
}
}
return vw.WriteString(val.String())
}
func (sc *StringCodec) decodeType(dc DecodeContext, vr bsonrw.ValueReader, t reflect.Type) (reflect.Value, error) {
if t.Kind() != reflect.String {
return emptyValue, ValueDecoderError{
Name: "StringDecodeValue",
Kinds: []reflect.Kind{reflect.String},
Received: reflect.Zero(t),
}
}
var str string
var err error
switch vr.Type() {
case bsontype.String:
str, err = vr.ReadString()
if err != nil {
return emptyValue, err
}
case bsontype.ObjectID:
oid, err := vr.ReadObjectID()
if err != nil {
return emptyValue, err
}
if sc.DecodeObjectIDAsHex {
str = oid.Hex()
} else {
byteArray := [12]byte(oid)
str = string(byteArray[:])
}
case bsontype.Symbol:
str, err = vr.ReadSymbol()
if err != nil {
return emptyValue, err
}
case bsontype.Binary:
data, subtype, err := vr.ReadBinary()
if err != nil {
return emptyValue, err
}
if subtype != bsontype.BinaryGeneric && subtype != bsontype.BinaryBinaryOld {
return emptyValue, decodeBinaryError{subtype: subtype, typeName: "string"}
}
str = string(data)
case bsontype.Null:
if err = vr.ReadNull(); err != nil {
return emptyValue, err
}
case bsontype.Undefined:
if err = vr.ReadUndefined(); err != nil {
return emptyValue, err
}
default:
return emptyValue, fmt.Errorf("cannot decode %v into a string type", vr.Type())
}
return reflect.ValueOf(str), nil
}
// DecodeValue is the ValueDecoder for string types.
func (sc *StringCodec) DecodeValue(dctx DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error {
if !val.CanSet() || val.Kind() != reflect.String {
return ValueDecoderError{Name: "StringDecodeValue", Kinds: []reflect.Kind{reflect.String}, Received: val}
}
elem, err := sc.decodeType(dctx, vr, val.Type())
if err != nil {
return err
}
val.SetString(elem.String())
return nil
}
|
