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extract_op.go
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/
extract_op.go
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// 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 (
"fmt"
"golang.org/x/net/context"
bq "google.golang.org/api/bigquery/v2"
)
type extractOption interface {
customizeExtract(conf *bq.JobConfigurationExtract, projectID string)
}
// DisableHeader returns an Option that disables the printing of a header row in exported data.
func DisableHeader() Option { return disableHeader{} }
type disableHeader struct{}
func (opt disableHeader) implementsOption() {}
func (opt disableHeader) customizeExtract(conf *bq.JobConfigurationExtract, projectID string) {
f := false
conf.PrintHeader = &f
}
func (c *Client) extract(ctx context.Context, dst *GCSReference, src *Table, options []Option) (*Job, error) {
job, options := initJobProto(c.projectID, options)
payload := &bq.JobConfigurationExtract{}
dst.customizeExtractDst(payload, c.projectID)
src.customizeExtractSrc(payload, c.projectID)
for _, opt := range options {
o, ok := opt.(extractOption)
if !ok {
return nil, fmt.Errorf("option (%#v) not applicable to dst/src pair: dst: %T ; src: %T", opt, dst, src)
}
o.customizeExtract(payload, c.projectID)
}
job.Configuration = &bq.JobConfiguration{
Extract: payload,
}
return c.service.insertJob(ctx, job, c.projectID)
}