Nrthugu

I need to use some way to get all fields that are annotated with a specific annotation. The annotation may be at the field or the getter (of a super class), like

public MyClass {



    @MyAnnotation

    String myName;



    int myAge;



    @MyAnnotation

    int getMyAge() { return myAge; }

}

So I need Field getAllAnnotatedFields(MyClass.class, MyAnnotation.class).

I could write that method on my own, but I wonder, if there exists some util method. (I cannot found one in Apache commons, Guava or Google reflections).

This is my solution using Apache commons:

public static Collection<String> getPropertyNamesListWithAnnotation(Class<?> targetClass, Class<? extends Annotation> annotationClass) {

    Set<String> fieldNamesWithAnnotation = FieldUtils.getFieldsListWithAnnotation(targetClass, annotationClass).stream().map(Field::getName).collect(Collectors.toSet());

    fieldNamesWithAnnotation.addAll(MethodUtils.getMethodsListWithAnnotation(targetClass, annotationClass, true, false).stream()

            .map(Method::getName)

            .filter(LangHelper::isValidGetterOrSetter)

            .map(name -> StringUtils.uncapitalize(RegExUtils.replaceFirst(name, "^(get|set|is)", "")))

            .collect(Collectors.toSet()));

    return fieldNamesWithAnnotation;

}



private static boolean isValidGetterOrSetter(String methodName) {

    if (!StringUtils.startsWithAny(methodName, "get", "set", "is")) {

        LOG.warn("Annotated method is no valid getter or setter: '{}' -> Ignoring", methodName);

        return false;

    }

    return true;

}