[chore][pkg/stanza] Cleanup flatten operator files (#32063)

Contributes to #32058

pkg/stanza/operator/transformer/flatten/flatten.go → pkg/stanza/operator/transformer/flatten/config.go

@@ -4,13 +4,11 @@
 package flatten // import "github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator/transformer/flatten"
 
 import (
-	"context"
 	"fmt"
 
 	"go.uber.org/zap"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/entry"
-	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/errors"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator/helper"
 )
@@ -69,47 +67,3 @@ func (c Config) Build(logger *zap.SugaredLogger) (operator.Operator, error) {
 
 	return nil, fmt.Errorf("invalid field type: %T", c.Field.FieldInterface)
 }
-
-// Transformer flattens an object in the entry field
-type Transformer[T interface {
-	entry.BodyField | entry.ResourceField | entry.AttributeField
-	entry.FieldInterface
-	Parent() T
-	Child(string) T
-}] struct {
-	helper.TransformerOperator
-	Field T
-}
-
-// Process will process an entry with a flatten transformation.
-func (p *Transformer[T]) Process(ctx context.Context, entry *entry.Entry) error {
-	return p.ProcessWith(ctx, entry, p.Transform)
-}
-
-// Transform will apply the flatten operation to an entry
-func (p *Transformer[T]) Transform(entry *entry.Entry) error {
-	parent := p.Field.Parent()
-	val, ok := entry.Delete(p.Field)
-	if !ok {
-		// The field doesn't exist, so ignore it
-		return fmt.Errorf("apply flatten: field %s does not exist on entry", p.Field)
-	}
-
-	valMap, ok := val.(map[string]any)
-	if !ok {
-		// The field we were asked to flatten was not a map, so put it back
-		err := entry.Set(p.Field, val)
-		if err != nil {
-			return errors.Wrap(err, "reset non-map field")
-		}
-		return fmt.Errorf("apply flatten: field %s is not a map", p.Field)
-	}
-
-	for k, v := range valMap {
-		err := entry.Set(parent.Child(k), v)
-		if err != nil {
-			return err
-		}
-	}
-	return nil
-}

pkg/stanza/operator/transformer/flatten/transformer.go

@@ -0,0 +1,57 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package flatten // import "github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator/transformer/flatten"
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/entry"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/errors"
+	"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/stanza/operator/helper"
+)
+
+// Transformer flattens an object in the entry field
+type Transformer[T interface {
+	entry.BodyField | entry.ResourceField | entry.AttributeField
+	entry.FieldInterface
+	Parent() T
+	Child(string) T
+}] struct {
+	helper.TransformerOperator
+	Field T
+}
+
+// Process will process an entry with a flatten transformation.
+func (t *Transformer[T]) Process(ctx context.Context, entry *entry.Entry) error {
+	return t.ProcessWith(ctx, entry, t.Transform)
+}
+
+// Transform will apply the flatten operation to an entry
+func (t *Transformer[T]) Transform(entry *entry.Entry) error {
+	parent := t.Field.Parent()
+	val, ok := entry.Delete(t.Field)
+	if !ok {
+		// The field doesn't exist, so ignore it
+		return fmt.Errorf("apply flatten: field %s does not exist on entry", t.Field)
+	}
+
+	valMap, ok := val.(map[string]any)
+	if !ok {
+		// The field we were asked to flatten was not a map, so put it back
+		err := entry.Set(t.Field, val)
+		if err != nil {
+			return errors.Wrap(err, "reset non-map field")
+		}
+		return fmt.Errorf("apply flatten: field %s is not a map", t.Field)
+	}
+
+	for k, v := range valMap {
+		err := entry.Set(parent.Child(k), v)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}