private void validateClass(Class<?> source, ValidationProblemCollector problems) {
int modifiers = source.getModifiers();
if (Modifier.isInterface(modifiers)) {
problems.add("Must be a class, not an interface");
}
if (source.getEnclosingClass() != null) {
if (Modifier.isStatic(modifiers)) {
if (Modifier.isPrivate(modifiers)) {
problems.add("Class cannot be private");
}
} else {
problems.add("Enclosed classes must be static and non private");
}
}
Constructor<?>[] constructors = source.getDeclaredConstructors();
for (Constructor<?> constructor : constructors) {
if (constructor.getParameterTypes().length > 0) {
problems.add("Cannot declare a constructor that takes arguments");
break;
}
}
Field[] fields = source.getDeclaredFields();
for (Field field : fields) {
int fieldModifiers = field.getModifiers();
if (!field.isSynthetic()
&& !(Modifier.isStatic(fieldModifiers) && Modifier.isFinal(fieldModifiers))) {
problems.add(field, "Fields must be static final.");
}
}
}
@Override
public T create() {
Class<T> concreteClass = type.getConcreteClass();
try {
Constructor<T> declaredConstructor = concreteClass.getDeclaredConstructor();
declaredConstructor.setAccessible(true);
return declaredConstructor.newInstance();
} catch (InvocationTargetException e) {
throw UncheckedException.throwAsUncheckedException(e.getTargetException());
} catch (Exception e) {
throw UncheckedException.throwAsUncheckedException(e);
}
}