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list.go
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list.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 (
"fmt"
"io"
"github.com/datastax/go-cassandra-native-protocol/primitive"
)
// List is a data type that represents a CQL list type.
// +k8s:deepcopy-gen=true
// +k8s:deepcopy-gen:interfaces=github.com/datastax/go-cassandra-native-protocol/datatype.DataType
type List struct {
ElementType DataType
}
func NewList(elementType DataType) *List {
return &List{ElementType: elementType}
}
func (t *List) Code() primitive.DataTypeCode {
return primitive.DataTypeCodeList
}
func (t *List) String() string {
return t.AsCql()
}
func (t *List) AsCql() string {
return fmt.Sprintf("list<%v>", t.ElementType.AsCql())
}
func writeListType(t DataType, dest io.Writer, version primitive.ProtocolVersion) (err error) {
if listType, ok := t.(*List); !ok {
return fmt.Errorf("expected *List, got %T", t)
} else if err = WriteDataType(listType.ElementType, dest, version); err != nil {
return fmt.Errorf("cannot write list element type: %w", err)
}
return nil
}
func lengthOfListType(t DataType, version primitive.ProtocolVersion) (length int, err error) {
if listType, ok := t.(*List); !ok {
return -1, fmt.Errorf("expected *List, got %T", t)
} else if elementLength, err := LengthOfDataType(listType.ElementType, version); err != nil {
return -1, fmt.Errorf("cannot compute length of list element type: %w", err)
} else {
length += elementLength
}
return length, nil
}
func readListType(source io.Reader, version primitive.ProtocolVersion) (decoded DataType, err error) {
listType := &List{}
if listType.ElementType, err = ReadDataType(source, version); err != nil {
return nil, fmt.Errorf("cannot read list element type: %w", err)
}
return listType, nil
}