restic/vendor/cloud.google.com/go/bigquery/nulls.go

170 lines
4.6 KiB
Go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 bigquery
import (
"encoding/json"
"fmt"
"reflect"
"time"
"cloud.google.com/go/civil"
)
// NullInt64 represents a BigQuery INT64 that may be NULL.
type NullInt64 struct {
Int64 int64
Valid bool // Valid is true if Int64 is not NULL.
}
func (n NullInt64) String() string { return nullstr(n.Valid, n.Int64) }
// NullString represents a BigQuery STRING that may be NULL.
type NullString struct {
StringVal string
Valid bool // Valid is true if StringVal is not NULL.
}
func (n NullString) String() string { return nullstr(n.Valid, n.StringVal) }
// NullFloat64 represents a BigQuery FLOAT64 that may be NULL.
type NullFloat64 struct {
Float64 float64
Valid bool // Valid is true if Float64 is not NULL.
}
func (n NullFloat64) String() string { return nullstr(n.Valid, n.Float64) }
// NullBool represents a BigQuery BOOL that may be NULL.
type NullBool struct {
Bool bool
Valid bool // Valid is true if Bool is not NULL.
}
func (n NullBool) String() string { return nullstr(n.Valid, n.Bool) }
// NullTimestamp represents a BigQuery TIMESTAMP that may be null.
type NullTimestamp struct {
Timestamp time.Time
Valid bool // Valid is true if Time is not NULL.
}
func (n NullTimestamp) String() string { return nullstr(n.Valid, n.Timestamp) }
// NullDate represents a BigQuery DATE that may be null.
type NullDate struct {
Date civil.Date
Valid bool // Valid is true if Date is not NULL.
}
func (n NullDate) String() string { return nullstr(n.Valid, n.Date) }
// NullTime represents a BigQuery TIME that may be null.
type NullTime struct {
Time civil.Time
Valid bool // Valid is true if Time is not NULL.
}
func (n NullTime) String() string {
if !n.Valid {
return "<null>"
}
return CivilTimeString(n.Time)
}
// NullDateTime represents a BigQuery DATETIME that may be null.
type NullDateTime struct {
DateTime civil.DateTime
Valid bool // Valid is true if DateTime is not NULL.
}
func (n NullDateTime) String() string {
if !n.Valid {
return "<null>"
}
return CivilDateTimeString(n.DateTime)
}
func (n NullInt64) MarshalJSON() ([]byte, error) { return nulljson(n.Valid, n.Int64) }
func (n NullFloat64) MarshalJSON() ([]byte, error) { return nulljson(n.Valid, n.Float64) }
func (n NullBool) MarshalJSON() ([]byte, error) { return nulljson(n.Valid, n.Bool) }
func (n NullString) MarshalJSON() ([]byte, error) { return nulljson(n.Valid, n.StringVal) }
func (n NullTimestamp) MarshalJSON() ([]byte, error) { return nulljson(n.Valid, n.Timestamp) }
func (n NullDate) MarshalJSON() ([]byte, error) { return nulljson(n.Valid, n.Date) }
func (n NullTime) MarshalJSON() ([]byte, error) {
if !n.Valid {
return jsonNull, nil
}
return []byte(`"` + CivilTimeString(n.Time) + `"`), nil
}
func (n NullDateTime) MarshalJSON() ([]byte, error) {
if !n.Valid {
return jsonNull, nil
}
return []byte(`"` + CivilDateTimeString(n.DateTime) + `"`), nil
}
func nullstr(valid bool, v interface{}) string {
if !valid {
return "NULL"
}
return fmt.Sprint(v)
}
var jsonNull = []byte("null")
func nulljson(valid bool, v interface{}) ([]byte, error) {
if !valid {
return jsonNull, nil
}
return json.Marshal(v)
}
var (
typeOfNullInt64 = reflect.TypeOf(NullInt64{})
typeOfNullFloat64 = reflect.TypeOf(NullFloat64{})
typeOfNullBool = reflect.TypeOf(NullBool{})
typeOfNullString = reflect.TypeOf(NullString{})
typeOfNullTimestamp = reflect.TypeOf(NullTimestamp{})
typeOfNullDate = reflect.TypeOf(NullDate{})
typeOfNullTime = reflect.TypeOf(NullTime{})
typeOfNullDateTime = reflect.TypeOf(NullDateTime{})
)
func nullableFieldType(t reflect.Type) FieldType {
switch t {
case typeOfNullInt64:
return IntegerFieldType
case typeOfNullFloat64:
return FloatFieldType
case typeOfNullBool:
return BooleanFieldType
case typeOfNullString:
return StringFieldType
case typeOfNullTimestamp:
return TimestampFieldType
case typeOfNullDate:
return DateFieldType
case typeOfNullTime:
return TimeFieldType
case typeOfNullDateTime:
return DateTimeFieldType
default:
return ""
}
}