private final Context context;
    private final Function<Diagnostic<? extends JavaFileObject>, String> messageFormatter;

    private int errorCount = 0;
    private int warningCount = 0;

    DiagnosticToProblemListener(InternalProblemReporter problemReporter, Context context, Function<Diagnostic<? extends JavaFileObject>, String> messageFormatter) {
        this.problemReporter = problemReporter;

                        import javax.lang.model.element.TypeElement;
                        import javax.lang.model.SourceVersion;
                        import javax.tools.JavaFileObject;

                        @SupportedAnnotationTypes("com.test.SimpleAnnotation")
                        public class SimpleAnnotationProcessor extends AbstractProcessor {
                            @Override

                        import javax.lang.model.element.TypeElement;
                        import javax.lang.model.SourceVersion;
                        import javax.tools.JavaFileObject;

                        @SupportedAnnotationTypes("com.test.SimpleAnnotation")
                        @SupportedOptions({ "suffix" })

                    TypeElement typeElement = (TypeElement) element;
                    String className = typeElement.getSimpleName().toString() + "Thingy";
                    try {
                        JavaFileObject sourceFile = filer.createSourceFile(className, element);
                        Writer writer = sourceFile.openWriter();
                        try {
                            writer.write("class " + className + " {");