Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | // Copyright (C) MongoDB, Inc. 2017-present. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 4 | // not use this file except in compliance with the License. You may obtain |
| 5 | // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | |
| 7 | package bson |
| 8 | |
| 9 | import ( |
| 10 | "errors" |
| 11 | "reflect" |
| 12 | |
| 13 | "github.com/mongodb/mongo-go-driver/bson/bsoncodec" |
| 14 | "github.com/mongodb/mongo-go-driver/bson/bsonrw" |
| 15 | ) |
| 16 | |
| 17 | var primitiveCodecs PrimitiveCodecs |
| 18 | |
| 19 | // PrimitiveCodecs is a namespace for all of the default bsoncodec.Codecs for the primitive types |
| 20 | // defined in this package. |
| 21 | type PrimitiveCodecs struct{} |
| 22 | |
| 23 | // RegisterPrimitiveCodecs will register the encode and decode methods attached to PrimitiveCodecs |
| 24 | // with the provided RegistryBuilder. if rb is nil, a new empty RegistryBuilder will be created. |
| 25 | func (pc PrimitiveCodecs) RegisterPrimitiveCodecs(rb *bsoncodec.RegistryBuilder) { |
| 26 | if rb == nil { |
| 27 | panic(errors.New("argument to RegisterPrimitiveCodecs must not be nil")) |
| 28 | } |
| 29 | |
| 30 | rb. |
| 31 | RegisterEncoder(tRawValue, bsoncodec.ValueEncoderFunc(pc.RawValueEncodeValue)). |
| 32 | RegisterEncoder(tRaw, bsoncodec.ValueEncoderFunc(pc.RawEncodeValue)). |
| 33 | RegisterDecoder(tRawValue, bsoncodec.ValueDecoderFunc(pc.RawValueDecodeValue)). |
| 34 | RegisterDecoder(tRaw, bsoncodec.ValueDecoderFunc(pc.RawDecodeValue)) |
| 35 | } |
| 36 | |
| 37 | // RawValueEncodeValue is the ValueEncoderFunc for RawValue. |
| 38 | func (PrimitiveCodecs) RawValueEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error { |
| 39 | if !val.IsValid() || val.Type() != tRawValue { |
| 40 | return bsoncodec.ValueEncoderError{Name: "RawValueEncodeValue", Types: []reflect.Type{tRawValue}, Received: val} |
| 41 | } |
| 42 | |
| 43 | rawvalue := val.Interface().(RawValue) |
| 44 | |
| 45 | return bsonrw.Copier{}.CopyValueFromBytes(vw, rawvalue.Type, rawvalue.Value) |
| 46 | } |
| 47 | |
| 48 | // RawValueDecodeValue is the ValueDecoderFunc for RawValue. |
| 49 | func (PrimitiveCodecs) RawValueDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 50 | if !val.CanSet() || val.Type() != tRawValue { |
| 51 | return bsoncodec.ValueDecoderError{Name: "RawValueDecodeValue", Types: []reflect.Type{tRawValue}, Received: val} |
| 52 | } |
| 53 | |
| 54 | t, value, err := bsonrw.Copier{}.CopyValueToBytes(vr) |
| 55 | if err != nil { |
| 56 | return err |
| 57 | } |
| 58 | |
| 59 | val.Set(reflect.ValueOf(RawValue{Type: t, Value: value})) |
| 60 | return nil |
| 61 | } |
| 62 | |
| 63 | // RawEncodeValue is the ValueEncoderFunc for Reader. |
| 64 | func (PrimitiveCodecs) RawEncodeValue(ec bsoncodec.EncodeContext, vw bsonrw.ValueWriter, val reflect.Value) error { |
| 65 | if !val.IsValid() || val.Type() != tRaw { |
| 66 | return bsoncodec.ValueEncoderError{Name: "RawEncodeValue", Types: []reflect.Type{tRaw}, Received: val} |
| 67 | } |
| 68 | |
| 69 | rdr := val.Interface().(Raw) |
| 70 | |
| 71 | return bsonrw.Copier{}.CopyDocumentFromBytes(vw, rdr) |
| 72 | } |
| 73 | |
| 74 | // RawDecodeValue is the ValueDecoderFunc for Reader. |
| 75 | func (PrimitiveCodecs) RawDecodeValue(dc bsoncodec.DecodeContext, vr bsonrw.ValueReader, val reflect.Value) error { |
| 76 | if !val.CanSet() || val.Type() != tRaw { |
| 77 | return bsoncodec.ValueDecoderError{Name: "RawDecodeValue", Types: []reflect.Type{tRaw}, Received: val} |
| 78 | } |
| 79 | |
| 80 | if val.IsNil() { |
| 81 | val.Set(reflect.MakeSlice(val.Type(), 0, 0)) |
| 82 | } |
| 83 | |
| 84 | val.SetLen(0) |
| 85 | |
| 86 | rdr, err := bsonrw.Copier{}.AppendDocumentBytes(val.Interface().(Raw), vr) |
| 87 | val.Set(reflect.ValueOf(rdr)) |
| 88 | return err |
| 89 | } |
| 90 | |
| 91 | func (pc PrimitiveCodecs) encodeRaw(ec bsoncodec.EncodeContext, dw bsonrw.DocumentWriter, raw Raw) error { |
| 92 | var copier bsonrw.Copier |
| 93 | elems, err := raw.Elements() |
| 94 | if err != nil { |
| 95 | return err |
| 96 | } |
| 97 | for _, elem := range elems { |
| 98 | dvw, err := dw.WriteDocumentElement(elem.Key()) |
| 99 | if err != nil { |
| 100 | return err |
| 101 | } |
| 102 | |
| 103 | val := elem.Value() |
| 104 | err = copier.CopyValueFromBytes(dvw, val.Type, val.Value) |
| 105 | if err != nil { |
| 106 | return err |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | return dw.WriteDocumentEnd() |
| 111 | } |