# Package org.codehaus.groovy.control.customizers

- Interface Summary
  Interface | Description
  --- | ---
  SecureASTCustomizer.ExpressionChecker | This interface allows the user to provide a custom expression checker if the dis/allowed expression lists are not sufficient
  SecureASTCustomizer.StatementChecker | This interface allows the user to provide a custom statement checker if the dis/allowed statement lists are not sufficient

- Class Summary
  Class | Description
  --- | ---
  CompilationCustomizer | Users wanting to customize the configuration process such as adding imports, restricting the language features or apply AST transformations by default should implement this class, then call the `CompilerConfiguration.addCompilationCustomizers(CompilationCustomizer...)` method.
  DelegatingCustomizer | Base class for compilation customizers which delegate to another customizer.
  ImportCustomizer | This compilation customizer allows addiing various types of imports to the compilation unit.
  SecureASTCustomizer | This customizer allows securing source code by controlling what code constructs are permitted.
  SourceAwareCustomizer | A base class for customizers which only have to be applied on specific source units.