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tuple.go
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tuple.go
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// Copyright 2020 Dolthub, 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 typeinfo
import (
"context"
"fmt"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/dolt/go/store/types"
)
type tupleType struct{}
var _ TypeInfo = (*tupleType)(nil)
// This is for internal use only. Used in merge conflicts.
var TupleType = &tupleType{}
// ConvertNomsValueToValue implements TypeInfo interface.
func (ti *tupleType) ConvertNomsValueToValue(v types.Value) (interface{}, error) {
if _, ok := v.(types.Null); ok {
return nil, nil
}
return v, nil
}
// ReadFrom reads a go value from a noms types.CodecReader directly
func (ti *tupleType) ReadFrom(_ *types.NomsBinFormat, reader types.CodecReader) (interface{}, error) {
k := reader.ReadKind()
switch k {
case types.NullKind:
return nil, nil
}
return nil, fmt.Errorf(`"%v" cannot convert NomsKind "%v" to a value`, ti.String(), k)
}
// ConvertValueToNomsValue implements TypeInfo interface.
func (ti *tupleType) ConvertValueToNomsValue(ctx context.Context, vrw types.ValueReadWriter, v interface{}) (types.Value, error) {
if tVal, ok := v.(types.Value); ok {
return tVal, nil
}
if v == nil {
return types.NullValue, nil
}
return nil, fmt.Errorf(`"%v" cannot convert value "%v" of type "%T" as it is invalid`, ti.String(), v, v)
}
// Equals implements TypeInfo interface.
func (ti *tupleType) Equals(other TypeInfo) bool {
if other == nil {
return false
}
_, ok := other.(*tupleType)
return ok
}
// FormatValue implements TypeInfo interface.
func (ti *tupleType) FormatValue(v types.Value) (*string, error) {
return nil, fmt.Errorf(`"%v" cannot convert NomsKind "%v" to a string`, ti.String(), v.Kind())
}
// GetTypeIdentifier implements TypeInfo interface.
func (ti *tupleType) GetTypeIdentifier() Identifier {
return TupleTypeIdentifier
}
// GetTypeParams implements TypeInfo interface.
func (ti *tupleType) GetTypeParams() map[string]string {
panic("cannot persist tuple type")
}
// IsValid implements TypeInfo interface.
func (ti *tupleType) IsValid(v types.Value) bool {
if v == nil {
return true
}
_, ok := v.(types.Value)
return ok
}
// NomsKind implements TypeInfo interface.
func (ti *tupleType) NomsKind() types.NomsKind {
return types.TupleKind
}
// Promote implements TypeInfo interface.
func (ti *tupleType) Promote() TypeInfo {
return ti
}
// String implements TypeInfo interface.
func (ti *tupleType) String() string {
return "Tuple"
}
// ToSqlType implements TypeInfo interface.
func (ti *tupleType) ToSqlType() sql.Type {
panic("we should never be calling the SQL type on a Tuple column")
}