pavel-avilov commented on a change in pull request #16482:
URL: https://github.com/apache/beam/pull/16482#discussion_r783041641



##########
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 {

Review comment:
       ```suggestion
   func (jb *JavaPreparersBuilder) WithPublicClassRemover() 
*JavaPreparersBuilder {
   ```

##########
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) {
+       builder.
+               PythonPreparers().
+               WithLogHandler()
+}
+
+//PythonPreparersBuilder facet of PreparersBuilder
+type PythonPreparersBuilder struct {
+       PreparersBuilder
+}
+
+//PythonPreparers chains to type *PreparersBuilder and returns a 
*GoPreparersBuilder
+func (b *PreparersBuilder) PythonPreparers() *PythonPreparersBuilder {
+       return &PythonPreparersBuilder{*b}
+}
+
+//WithLogHandler adds code for logging
+func (a *PythonPreparersBuilder) WithLogHandler() *PythonPreparersBuilder {

Review comment:
       ```suggestion
   func (pb *PythonPreparersBuilder) WithLogHandler() *PythonPreparersBuilder {
   ```

##########
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 {

Review comment:
       ditto

##########
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 {

Review comment:
       ditto

##########
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 {

Review comment:
       ditto




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