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package csv
import (
"fmt"
"github.com/wildducktheories/go-csv/utils"
)
// Given a header-prefixed input stream of CSV records and the specification of a partial key (PartialKey)
// formed from one or more of the fields, generate an augmented, header-prefixed, stream of CSV records
// such that the augmented key of each output record is unique. The field used to ensure uniqueness is
// specified by the AdditionalKey option.
//
// For example, given the following input with the partial key Date,Amount
//
// Date,Amount,Description
// 2014/12/31,100.0,Payment
// 2014/12/31,100.0,Payment
// 2014/12/31,85.0,Payment
//
// Generate an additional column, Sequence, such that the augmented key Date,Amount,Sequence is unique
// for all input records.
//
// Date,Amount,Description,Sequence
// 2014/12/31,100.0,Payment,
// 2014/12/31,100.0,Payment,1
// 2014/12/31,85.0,Payment,
type UniquifyProcess struct {
PartialKeys []string
AdditionalKey string
}
func (p *UniquifyProcess) Run(reader Reader, builder WriterBuilder, errCh chan<- error) { // check that the partial keys exist in the dataHeader
defer reader.Close()
var line = 0
var failed = true
var err error
defer func() {
if failed {
if err == nil {
err = fmt.Errorf("failed at line: %d", line+1)
} else {
err = fmt.Errorf("failed at line: %d: %s", line+1, err)
}
}
errCh <- err
}()
partialKeys := p.PartialKeys
additionalKey := p.AdditionalKey
line = 1
// create a stream from the header
dataHeader := reader.Header()
i, a, _ := utils.Intersect(partialKeys, dataHeader)
if len(a) > 0 {
err = fmt.Errorf("%s does not exist in the data header", Format(a))
return
}
i, a, _ = utils.Intersect([]string{additionalKey}, dataHeader)
if len(i) != 0 {
err = fmt.Errorf("%s already exists in data header", i[0])
return
}
augmentedHeader := make([]string, len(dataHeader)+1)
copy(augmentedHeader, dataHeader)
augmentedHeader[len(dataHeader)] = additionalKey
keys := make(map[string]int)
writer := builder(augmentedHeader)
defer writer.Close(err)
for data := range reader.C() {
line++
augmentedData := writer.Blank()
key := make([]string, len(partialKeys))
for i, h := range partialKeys {
key[i] = data.Get(h)
}
formattedKey := Format(key)
additionalKeyValue, ok := keys[formattedKey]
if !ok {
additionalKeyValue = 0
} else {
additionalKeyValue++
}
keys[formattedKey] = additionalKeyValue
augmentedData.PutAll(data)
if additionalKeyValue > 0 {
augmentedData.Put(additionalKey, fmt.Sprintf("%d", additionalKeyValue))
}
writer.Write(augmentedData)
}
failed = false
err = reader.Error()
}
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