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tuple.go
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tuple.go
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// Copyright 2020 DataStax
//
// 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 datatype
import (
"bytes"
"fmt"
"io"
"github.com/datastax/go-cassandra-native-protocol/primitive"
)
// Tuple is a data type that represents a CQL tuple type.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/datastax/go-cassandra-native-protocol/datatype.DataType
type Tuple struct {
FieldTypes []DataType
}
func NewTuple(fieldTypes ...DataType) *Tuple {
return &Tuple{FieldTypes: fieldTypes}
}
func (t *Tuple) Code() primitive.DataTypeCode {
return primitive.DataTypeCodeTuple
}
func (t *Tuple) String() string {
return t.AsCql()
}
func (t *Tuple) AsCql() string {
buf := &bytes.Buffer{}
buf.WriteString("tuple<")
for i, elementType := range t.FieldTypes {
if i > 0 {
buf.WriteString(",")
}
buf.WriteString(elementType.AsCql())
}
buf.WriteString(">")
return buf.String()
}
func writeTupleType(t DataType, dest io.Writer, version primitive.ProtocolVersion) (err error) {
tupleType, ok := t.(*Tuple)
if !ok {
return fmt.Errorf("expected *Tuple, got %T", t)
} else if err = primitive.WriteShort(uint16(len(tupleType.FieldTypes)), dest); err != nil {
return fmt.Errorf("cannot write tuple type field count: %w", err)
}
for i, fieldType := range tupleType.FieldTypes {
if err = WriteDataType(fieldType, dest, version); err != nil {
return fmt.Errorf("cannot write tuple field %d: %w", i, err)
}
}
return nil
}
func lengthOfTupleType(t DataType, version primitive.ProtocolVersion) (int, error) {
if tupleType, ok := t.(*Tuple); !ok {
return -1, fmt.Errorf("expected *Tuple, got %T", t)
} else {
length := primitive.LengthOfShort // field count
for i, fieldType := range tupleType.FieldTypes {
if fieldLength, err := LengthOfDataType(fieldType, version); err != nil {
return -1, fmt.Errorf("cannot compute length of tuple field %d: %w", i, err)
} else {
length += fieldLength
}
}
return length, nil
}
}
func readTupleType(source io.Reader, version primitive.ProtocolVersion) (DataType, error) {
if fieldCount, err := primitive.ReadShort(source); err != nil {
return nil, fmt.Errorf("cannot read tuple field count: %w", err)
} else {
tupleType := &Tuple{}
tupleType.FieldTypes = make([]DataType, fieldCount)
for i := 0; i < int(fieldCount); i++ {
if tupleType.FieldTypes[i], err = ReadDataType(source, version); err != nil {
return nil, fmt.Errorf("cannot read tuple field %d: %w", i, err)
}
}
return tupleType, nil
}
}