pabloem commented on a change in pull request #16172:
URL: https://github.com/apache/beam/pull/16172#discussion_r772570287



##########
File path: playground/backend/internal/preparators/java_preparators.go
##########
@@ -33,19 +38,50 @@ const (
        newLinePattern                    = "\n"
        pathSeparatorPattern              = os.PathSeparator
        tmpFileSuffix                     = "tmp"
+       publicClassNamePattern            = "public class (.*?) 
[{|implements(.*)]"
 )
 
 // GetJavaPreparators returns preparation methods that should be applied to 
Java code
 func GetJavaPreparators(filePath string) *[]Preparator {
-       publicClassModification := Preparator{
-               Prepare: replace,
+       removePublicClassPreparator := Preparator{
+               Prepare: removePublicClassModifier,
                Args:    []interface{}{filePath, 
classWithPublicModifierPattern, classWithoutPublicModifierPattern},
        }
-       additionalPackage := Preparator{
-               Prepare: replace,
+       changePackagePreparator := Preparator{
+               Prepare: changePackage,
                Args:    []interface{}{filePath, packagePattern, 
importStringPattern},
        }
-       return &[]Preparator{publicClassModification, additionalPackage}
+       removePackagePreparator := Preparator{
+               Prepare: removePackage,
+               Args:    []interface{}{filePath, packagePattern, 
newLinePattern},
+       }
+       unitTestFileNameChanger := Preparator{
+               Prepare: changeJavaTestFileName,
+               Args:    []interface{}{filePath},
+       }
+       return &[]Preparator{removePublicClassPreparator, 
changePackagePreparator, removePackagePreparator, unitTestFileNameChanger}
+}
+
+//changePackage changes the 'package' to 'import' and the last directory in 
the package value to '*'
+func changePackage(args ...interface{}) error {

Review comment:
       I worry that several of these methods take `args....` but in fact they 
expect fixed arguments. Could we make them have fixed arguments so that they're 
more understabdable?




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