Set a variable from an AOP advice - aop

Question

I use an AOP advice to convert a User object into a Owner object. The conversion is done in the advice but I would like to pass that Owner object to the caller.
#Aspect
public class UserAuthAspect {
#Inject
private OwnerDao ownerDao;
#Pointcut("#annotation(com.google.api.server.spi.config.ApiMethod)")
public void annotatedWithApiMethod() {
}
#Pointcut("execution(* *.*(.., com.google.appengine.api.users.User)) && args(.., user)")
public void allMethodsWithUserParameter(User user) {
}
#Before("annotatedWithApiMethod() && allMethodsWithUserParameter(user)")
public void checkUserLoggedIn(com.google.appengine.api.users.User user)
throws UnauthorizedException {
if (user == null) {
throw new UnauthorizedException("Must log in");
}
Owner owner = ownerDao.readByUser(user);
}
}
A class with advised methods:
public class RealEstatePropertyV1 {
#ApiMethod(name = "create", path = "properties", httpMethod = HttpMethod.POST)
public void create(RealEstateProperty property, User user) throws Exception {
Owner owner = the value set by the advice
}
}

Answer 1

I don't know if it's the right way to do it, so feel free to comment. I created an interface Authed and its implementation AuthedImpl.
public interface Authed {
void setOwner(Owner owner);
}
Then I made RealEstatePropertyV1 extends from AuthedImpl. I added a pointcut for all classes extending from AuthedImpl and also changed the pointcut so I can access to the target.
#Pointcut("execution(* *..AuthedImpl+.*(..))")
public void extendsAuthedImpl() {
}
#Pointcut("execution(* *.*(.., com.google.appengine.api.users.User)) && args(.., user) && target(callee)")
public void allMethodsWithUserParameter(User user, Authed callee) {
}
Finally the advice uses all pointcuts:
#Before("annotatedWithApiMethod() && allMethodsWithUserParameter(user, callee) && extendsAuthedImpl()")
public void checkUserLoggedIn(com.google.appengine.api.users.User user,
Authed callee) throws UnauthorizedException {
System.out.println(callee.getClass());
if (user == null) {
throw new UnauthorizedException("Must log in");
}
Owner owner = ownerDao.readByUser(user);
callee.setOwner(owner);
}