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exporter.go
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/
exporter.go
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package surveyresponses
import (
"encoding/csv"
"encoding/json"
"fmt"
"io"
studytypes "github.com/case-framework/case-backend/pkg/study/types"
)
type ResponseExporter struct {
parser *ResponseParser
writer io.Writer
csvWriter *csv.Writer
format string
counter int
}
func NewResponseExporter(
parser *ResponseParser,
writer io.Writer,
format string,
) (*ResponseExporter, error) {
re := &ResponseExporter{
parser: parser,
writer: writer,
format: format,
}
if err := re.init(); err != nil {
return nil, err
}
re.counter = 0
return re, nil
}
func (re *ResponseExporter) init() error {
var err error
switch re.format {
case "wide":
re.csvWriter = csv.NewWriter(re.writer)
record := []string{}
record = append(record, re.parser.columns.FixedColumns...)
record = append(record, re.parser.columns.ContextColumns...)
record = append(record, re.parser.columns.ResponseColumns...)
record = append(record, re.parser.columns.MetaColumns...)
err = re.csvWriter.Write(record)
if err != nil {
return err
}
case "long":
re.csvWriter = csv.NewWriter(re.writer)
record := []string{}
record = append(record, re.parser.columns.FixedColumns...)
record = append(record, re.parser.columns.ContextColumns...)
record = append(record, "responseSlot")
record = append(record, "value")
err = re.csvWriter.Write(record)
if err != nil {
return err
}
case "json":
_, err = re.writer.Write([]byte("{ \"responses\": ["))
default:
return fmt.Errorf("unsupported format: %s", re.format)
}
return err
}
func (re *ResponseExporter) WriteResponse(
rawResp *studytypes.SurveyResponse,
) error {
if re.parser == nil {
return fmt.Errorf("parser not initialized")
}
if re.writer == nil {
return fmt.Errorf("writer not initialized")
}
parsedResp, err := re.parser.ParseResponse(rawResp)
if err != nil {
return err
}
switch re.format {
case "wide":
cells, err := re.parser.ResponseToStrList(parsedResp)
if err != nil {
return err
}
err = re.csvWriter.Write(cells)
if err != nil {
return err
}
case "long":
records, err := re.parser.ResponseToLongFormat(parsedResp)
if err != nil {
return err
}
for _, record := range records {
err = re.csvWriter.Write(record)
if err != nil {
return err
}
}
case "json":
// write to json
flatObj, err := re.parser.ResponseToFlatObj(parsedResp)
if err != nil {
return err
}
rV, err := json.Marshal(flatObj)
if err != nil {
return err
}
if re.counter > 0 {
_, err = re.writer.Write([]byte(","))
if err != nil {
return err
}
}
_, err = re.writer.Write(rV)
if err != nil {
return err
}
default:
return fmt.Errorf("unsupported format: %s", re.format)
}
re.counter += 1
return nil
}
func (re *ResponseExporter) Finish() error {
switch re.format {
case "wide":
re.csvWriter.Flush()
case "long":
re.csvWriter.Flush()
case "json":
_, err := re.writer.Write([]byte("]}"))
if err != nil {
return err
}
default:
return fmt.Errorf("unsupported format: %s", re.format)
}
return nil
}