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// Copyright 2019 Google LLC
//
// 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 (
"fmt"
bq "google.golang.org/api/bigquery/v2"
)
// StandardSQLDataType conveys type information using the Standard SQL type
// system.
type StandardSQLDataType struct {
// ArrayElementType indicates the type of an array's elements, when the
// TypeKind is ARRAY.
ArrayElementType *StandardSQLDataType
// StructType indicates the struct definition (fields), when the
// TypeKind is STRUCT.
StructType *StandardSQLStructType
// The top-level type of this type definition.
// Can be any standard SQL data type. For more information about BigQuery
// data types, see
// https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types
//
// Additional information is available in the REST documentation:
// https://cloud.google.com/bigquery/docs/reference/rest/v2/StandardSqlDataType
TypeKind string
}
func (ssdt *StandardSQLDataType) toBQ() (*bq.StandardSqlDataType, error) {
if ssdt == nil {
return nil, nil
}
bqdt := &bq.StandardSqlDataType{
TypeKind: ssdt.TypeKind,
}
if ssdt.ArrayElementType != nil {
dt, err := ssdt.ArrayElementType.toBQ()
if err != nil {
return nil, err
}
bqdt.ArrayElementType = dt
}
if ssdt.StructType != nil {
dt, err := ssdt.StructType.toBQ()
if err != nil {
return nil, err
}
bqdt.StructType = dt
}
return bqdt, nil
}
func bqToStandardSQLDataType(bqdt *bq.StandardSqlDataType) (*StandardSQLDataType, error) {
if bqdt == nil {
return nil, nil
}
ssdt := &StandardSQLDataType{
TypeKind: bqdt.TypeKind,
}
if bqdt.ArrayElementType != nil {
dt, err := bqToStandardSQLDataType(bqdt.ArrayElementType)
if err != nil {
return nil, err
}
ssdt.ArrayElementType = dt
}
if bqdt.StructType != nil {
st, err := bqToStandardSQLStructType(bqdt.StructType)
if err != nil {
return nil, err
}
ssdt.StructType = st
}
return ssdt, nil
}
// StandardSQLField represents a field using the Standard SQL data type system.
type StandardSQLField struct {
// The name of this field. Can be absent for struct fields.
Name string
// Data type for the field.
Type *StandardSQLDataType
}
func (ssf *StandardSQLField) toBQ() (*bq.StandardSqlField, error) {
if ssf == nil {
return nil, nil
}
bqf := &bq.StandardSqlField{
Name: ssf.Name,
}
if ssf.Type != nil {
dt, err := ssf.Type.toBQ()
if err != nil {
return nil, err
}
bqf.Type = dt
}
return bqf, nil
}
func bqToStandardSQLField(bqf *bq.StandardSqlField) (*StandardSQLField, error) {
if bqf == nil {
return nil, nil
}
t, err := bqToStandardSQLDataType(bqf.Type)
if err != nil {
return nil, err
}
return &StandardSQLField{
Name: bqf.Name,
Type: t,
}, nil
}
// StandardSQLStructType represents a structure type, which is a list of Standard SQL fields.
// For more information, see:
// https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#struct-type
type StandardSQLStructType struct {
Fields []*StandardSQLField
}
func (ssst *StandardSQLStructType) toBQ() (*bq.StandardSqlStructType, error) {
if ssst == nil {
return nil, nil
}
fields, err := standardSQLStructFieldsToBQ(ssst.Fields)
if err != nil {
return nil, err
}
return &bq.StandardSqlStructType{
Fields: fields,
}, nil
}
func bqToStandardSQLStructType(bqst *bq.StandardSqlStructType) (*StandardSQLStructType, error) {
if bqst == nil {
return nil, nil
}
var fields []*StandardSQLField
for _, v := range bqst.Fields {
f, err := bqToStandardSQLField(v)
if err != nil {
return nil, err
}
fields = append(fields, f)
}
return &StandardSQLStructType{
Fields: fields,
}, nil
}
func standardSQLStructFieldsToBQ(fields []*StandardSQLField) ([]*bq.StandardSqlField, error) {
var bqFields []*bq.StandardSqlField
for _, v := range fields {
bqf, err := v.toBQ()
if err != nil {
return nil, fmt.Errorf("error converting struct fields: %v", err)
}
bqFields = append(bqFields, bqf)
}
return bqFields, nil
}
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