You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.3 KiB
96 lines
2.3 KiB
6 years ago
|
/*
|
||
|
|
* Minio Cloud Storage, (C) 2019 Minio, 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 csv
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bytes"
|
||
|
|
"encoding/csv"
|
||
|
|
"fmt"
|
||
|
|
|
||
|
|
"github.com/minio/minio/pkg/s3select/sql"
|
||
|
|
"github.com/tidwall/sjson"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Record - is CSV record.
|
||
|
|
type Record struct {
|
||
|
|
columnNames []string
|
||
|
|
csvRecord []string
|
||
|
|
nameIndexMap map[string]int64
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get - gets the value for a column name.
|
||
|
|
func (r *Record) Get(name string) (*sql.Value, error) {
|
||
|
|
index, found := r.nameIndexMap[name]
|
||
|
|
if !found {
|
||
|
|
return nil, fmt.Errorf("column %v not found", name)
|
||
|
|
}
|
||
|
|
|
||
|
|
if index >= int64(len(r.csvRecord)) {
|
||
|
|
// No value found for column 'name', hence return empty string for compatibility.
|
||
|
|
return sql.NewString(""), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
return sql.NewString(r.csvRecord[index]), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Set - sets the value for a column name.
|
||
|
|
func (r *Record) Set(name string, value *sql.Value) error {
|
||
|
|
r.columnNames = append(r.columnNames, name)
|
||
|
|
r.csvRecord = append(r.csvRecord, value.CSVString())
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// MarshalCSV - encodes to CSV data.
|
||
|
|
func (r *Record) MarshalCSV(fieldDelimiter rune) ([]byte, error) {
|
||
|
|
buf := new(bytes.Buffer)
|
||
|
|
w := csv.NewWriter(buf)
|
||
|
|
w.Comma = fieldDelimiter
|
||
|
|
if err := w.Write(r.csvRecord); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
w.Flush()
|
||
|
|
if err := w.Error(); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
data := buf.Bytes()
|
||
|
|
return data[:len(data)-1], nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// MarshalJSON - encodes to JSON data.
|
||
|
|
func (r *Record) MarshalJSON() ([]byte, error) {
|
||
|
|
data := "{}"
|
||
|
|
|
||
|
|
var err error
|
||
|
|
for i := len(r.columnNames) - 1; i >= 0; i-- {
|
||
|
|
if i >= len(r.csvRecord) {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
|
||
|
|
if data, err = sjson.Set(data, r.columnNames[i], r.csvRecord[i]); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return []byte(data), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewRecord - creates new CSV record.
|
||
|
|
func NewRecord() *Record {
|
||
|
|
return &Record{}
|
||
|
|
}
|