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flatten-object.go
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flatten-object.go
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package row
import (
"context"
"fmt"
"github.com/go-go-golems/glazed/pkg/middlewares"
"github.com/go-go-golems/glazed/pkg/types"
orderedmap "github.com/wk8/go-ordered-map/v2"
)
type FlattenObjectMiddleware struct {
}
var _ middlewares.RowMiddleware = (*FlattenObjectMiddleware)(nil)
func (fom *FlattenObjectMiddleware) Close(ctx context.Context) error {
return nil
}
func NewFlattenObjectMiddleware() *FlattenObjectMiddleware {
return &FlattenObjectMiddleware{}
}
func (fom *FlattenObjectMiddleware) Process(ctx context.Context, row types.Row) ([]types.Row, error) {
newRow := FlattenRow(row)
return []types.Row{newRow}, nil
}
func FlattenRow(row types.Row) types.Row {
ret := types.NewRow()
for pair := row.Oldest(); pair != nil; pair = pair.Next() {
key, value := pair.Key, pair.Value
switch v := value.(type) {
case map[string]interface{}:
childRow := types.NewRowFromMap(v)
newColumns := FlattenRow(childRow)
for pair_ := newColumns.Oldest(); pair_ != nil; pair_ = pair_.Next() {
k, v := pair_.Key, pair_.Value
ret.Set(fmt.Sprintf("%s.%s", key, k), v)
}
case *orderedmap.OrderedMap[string, string]:
childRow := types.NewRow()
for pair_ := v.Oldest(); pair_ != nil; pair_ = pair_.Next() {
k, v := pair_.Key, pair_.Value
childRow.Set(k, v)
}
newColumns := FlattenRow(childRow)
for pair_ := newColumns.Oldest(); pair_ != nil; pair_ = pair_.Next() {
k, v := pair_.Key, pair_.Value
ret.Set(fmt.Sprintf("%s.%s", key, k), v)
}
case types.Row:
newColumns := FlattenRow(v)
for pair_ := newColumns.Oldest(); pair_ != nil; pair_ = pair_.Next() {
k, v := pair_.Key, pair_.Value
ret.Set(fmt.Sprintf("%s.%s", key, k), v)
}
default:
ret.Set(key, v)
}
}
return ret
}