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codecs.go
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codecs.go
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// Copyright (c) DataStax, 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.
package proxycore
import (
"fmt"
"github.com/datastax/go-cassandra-native-protocol/datacodec"
"github.com/datastax/go-cassandra-native-protocol/datatype"
"github.com/datastax/go-cassandra-native-protocol/frame"
"github.com/datastax/go-cassandra-native-protocol/primitive"
)
var codec = frame.NewRawCodec()
var primitiveCodecs = map[datatype.DataType]datacodec.Codec{
datatype.Ascii: datacodec.Ascii,
datatype.Bigint: datacodec.Bigint,
datatype.Blob: datacodec.Blob,
datatype.Boolean: datacodec.Boolean,
datatype.Counter: datacodec.Counter,
datatype.Decimal: datacodec.Decimal,
datatype.Double: datacodec.Double,
datatype.Float: datacodec.Float,
datatype.Inet: datacodec.Inet,
datatype.Int: datacodec.Int,
datatype.Smallint: datacodec.Smallint,
datatype.Varchar: datacodec.Varchar,
datatype.Timeuuid: datacodec.Timeuuid,
datatype.Tinyint: datacodec.Tinyint,
datatype.Uuid: datacodec.Uuid,
datatype.Varint: datacodec.Varint,
}
func EncodeType(dt datatype.DataType, version primitive.ProtocolVersion, val interface{}) ([]byte, error) {
c, err := codecFromDataType(dt)
if err != nil {
return nil, err
}
return c.Encode(val, version)
}
func DecodeType(dt datatype.DataType, version primitive.ProtocolVersion, bytes []byte) (interface{}, error) {
c, err := codecFromDataType(dt)
if err != nil {
return nil, err
}
var dest interface{}
_, err = c.Decode(bytes, &dest, version)
return dest, err
}
func codecFromDataType(dt datatype.DataType) (datacodec.Codec, error) {
switch dt.GetDataTypeCode() {
case primitive.DataTypeCodeList:
listType := dt.(datatype.ListType)
return datacodec.NewList(datatype.NewListType(listType.GetElementType()))
case primitive.DataTypeCodeSet:
setType := dt.(datatype.SetType)
return datacodec.NewSet(datatype.NewListType(setType.GetElementType()))
case primitive.DataTypeCodeMap:
mapType := dt.(datatype.MapType)
return datacodec.NewMap(datatype.NewMapType(mapType.GetKeyType(), mapType.GetValueType()))
default:
codec, ok := primitiveCodecs[dt]
if !ok {
return nil, fmt.Errorf("no codec for data type %v", dt)
}
return codec, nil
}
}