KhaninArtur commented on a change in pull request #16482:
URL: https://github.com/apache/beam/pull/16482#discussion_r782944110



##########
File path: playground/backend/internal/preparators/go_preparators.go
##########
@@ -33,13 +31,44 @@ const (
        sep     = "."
 )
 
+//GoPreparersBuilder facet of PreparersBuilder
+type GoPreparersBuilder struct {
+       PreparersBuilder
+}
+
+//GoPreparers chains to type *PreparersBuilder and returns a 
*GoPreparersBuilder
+func (b *PreparersBuilder) GoPreparers() *GoPreparersBuilder {
+       return &GoPreparersBuilder{*b}
+}
+
+//WithCodeFormatter adds code formatter preparer
+func (a *GoPreparersBuilder) WithCodeFormatter() *GoPreparersBuilder {
+       formatCodePreparator := Preparator{
+               Prepare: formatCode,
+               Args:    []interface{}{a.filePath},
+       }
+       a.AddPreparer(formatCodePreparator)
+       return a
+}
+
+//WithFileNameChanger adds preparer to change file name
+func (a *GoPreparersBuilder) WithFileNameChanger() *GoPreparersBuilder {
+       changeTestFileName := Preparator{
+               Prepare: changeGoTestFileName,
+               Args:    []interface{}{a.filePath},
+       }
+       a.AddPreparer(changeTestFileName)
+       return a
+}
+
 // GetGoPreparators returns reparation methods that should be applied to Go 
code
-func GetGoPreparators(filePath string) *[]Preparator {
-       preparatorArgs := make([]interface{}, 1)
-       preparatorArgs[0] = filePath
-       formatCodePreparator := Preparator{Prepare: formatCode, Args: 
preparatorArgs}
-       changeNamePreparator := Preparator{Prepare: changeGoTestFileName, Args: 
preparatorArgs}
-       return &[]Preparator{formatCodePreparator, changeNamePreparator}
+func GetGoPreparators(builder *PreparersBuilder, isUnitTest bool) {

Review comment:
       Shouldn't we rename it to `GetGoPreparers` as well?

##########
File path: playground/backend/internal/preparators/java_preparators.go
##########
@@ -41,47 +39,85 @@ const (
        publicClassNamePattern            = "public class (.*?) 
[{|implements(.*)]"
 )
 
-// GetJavaPreparators returns preparation methods that should be applied to 
Java code
-func GetJavaPreparators(filePath string) *[]Preparator {
+//JavaPreparersBuilder facet of PreparersBuilder
+type JavaPreparersBuilder struct {
+       PreparersBuilder
+}
+
+//JavaPreparers chains to type *PreparersBuilder and returns a 
*JavaPreparersBuilder
+func (b *PreparersBuilder) JavaPreparers() *JavaPreparersBuilder {
+       return &JavaPreparersBuilder{*b}
+}
+
+//WithPublicClassRemover adds preparer to remove public class
+func (a *JavaPreparersBuilder) WithPublicClassRemover() *JavaPreparersBuilder {
        removePublicClassPreparator := Preparator{
                Prepare: removePublicClassModifier,
-               Args:    []interface{}{filePath, 
classWithPublicModifierPattern, classWithoutPublicModifierPattern},
+               Args:    []interface{}{a.filePath, 
classWithPublicModifierPattern, classWithoutPublicModifierPattern},
        }
+       a.AddPreparer(removePublicClassPreparator)
+       return a
+}
+
+//WithPackageChanger adds preparer to change package
+func (a *JavaPreparersBuilder) WithPackageChanger() *JavaPreparersBuilder {
        changePackagePreparator := Preparator{
                Prepare: changePackage,
-               Args:    []interface{}{filePath, packagePattern, 
importStringPattern},
+               Args:    []interface{}{a.filePath, packagePattern, 
importStringPattern},
        }
+       a.AddPreparer(changePackagePreparator)
+       return a
+}
+
+//WithPackageRemover adds preparer to remove package
+func (a *JavaPreparersBuilder) WithPackageRemover() *JavaPreparersBuilder {
        removePackagePreparator := Preparator{
                Prepare: removePackage,
-               Args:    []interface{}{filePath, packagePattern, 
newLinePattern},
+               Args:    []interface{}{a.filePath, packagePattern, 
newLinePattern},
        }
+       a.AddPreparer(removePackagePreparator)
+       return a
+}
+
+//WithFileNameChanger adds preparer to remove package
+func (a *JavaPreparersBuilder) WithFileNameChanger() *JavaPreparersBuilder {
        unitTestFileNameChanger := Preparator{
                Prepare: changeJavaTestFileName,
-               Args:    []interface{}{filePath},
+               Args:    []interface{}{a.filePath},
+       }
+       a.AddPreparer(unitTestFileNameChanger)
+       return a
+}
+
+// GetJavaPreparators returns preparation methods that should be applied to 
Java code
+func GetJavaPreparators(builder *PreparersBuilder, isUnitTest bool, isKata 
bool) {

Review comment:
       ditto

##########
File path: playground/backend/internal/utils/preparators_utils.go
##########
@@ -18,24 +18,34 @@ package utils
 import (
        pb "beam.apache.org/playground/backend/internal/api/v1"
        "beam.apache.org/playground/backend/internal/preparators"
+       "beam.apache.org/playground/backend/internal/validators"
        "fmt"
        "regexp"
+       "sync"
 )
 
 // GetPreparators returns slice of preparators.Preparator according to sdk
-func GetPreparators(sdk pb.Sdk, filepath string) (*[]preparators.Preparator, 
error) {
-       var prep *[]preparators.Preparator
+func GetPreparators(sdk pb.Sdk, filepath string, valResults *sync.Map) 
(*[]preparators.Preparator, error) {

Review comment:
       Should we also change this from `GetPreparators` to `GetPreparers`?

##########
File path: playground/backend/internal/preparators/python_preparators.go
##########
@@ -27,12 +27,30 @@ const (
 )
 
 // GetPythonPreparators returns preparation methods that should be applied to 
Python code
-func GetPythonPreparators(filePath string) *[]Preparator {
+func GetPythonPreparators(builder *PreparersBuilder) {

Review comment:
       ditto




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