private void checkForCorrectAnnotations(Object object) throws UnsupportedOperationException {
Map<Annotation, Object> annotationValueMapping = new HashMap<>();
for (Field field : object.getClass().getDeclaredFields()) {
ProvidesState providesStateAnnotation = field.getAnnotation(ProvidesState.class);
if (providesStateAnnotation != null) {
if (annotationValueMapping.put(providesStateAnnotation, providesStateAnnotation.value())
!= null) {
throw new UnsupportedOperationException(
"More than one @"
+ ProvidesState.class.getSimpleName()
+ " for "
+ providesStateAnnotation.value().getName()
+ " used in "
+ object.getClass().getName());
}
}
HandlesAction handlesActionAnnotation = field.getAnnotation(HandlesAction.class);
if (handlesActionAnnotation != null) {
if (annotationValueMapping.put(handlesActionAnnotation, handlesActionAnnotation.value())
!= null) {
throw new UnsupportedOperationException(
"More than one @"
+ HandlesAction.class.getSimpleName()
+ " for "
+ handlesActionAnnotation.value().getName()
+ " used in "
+ object.getClass().getName());
}
}
}
}
private Method findActionHandlerInstance(
Object viewModel, Class<? extends ActionHandler> actionHandlerType)
throws IllegalAccessException, UnsupportedOperationException {
checkForCorrectAnnotations(viewModel);
for (Method method : viewModel.getClass().getDeclaredMethods()) {
HandlesAction handlesActionAnnotation = method.getAnnotation(HandlesAction.class);
if (handlesActionAnnotation == null || handlesActionAnnotation.value() != actionHandlerType) {
continue;
}
if (!Modifier.isPublic(method.getModifiers())) {
method.setAccessible(true);
}
return method;
}
return null;
}