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@WithUserProfileVerification
public class InMemoryContactManager implements ContactManager {
 
    private final Set<Person> contacts = new HashSet<Person>();
 
    @RequiresProfile(ADMIN)
    public ContactManager add(Person person) {
        contacts.add(person);
        return this;
    }
 
    @RequiresProfile(ADMIN)
    public ContactManager remove(Person person) {
        contacts.remove(person);
        return this;
    }
 
    @RequiresProfile(USER)
    public Person lookup(String name) {
        for (Person person : contacts) {
            if (person.getName().equals(name)) {
                return person;
            }
        }
        return null;
    }
 
}

package info.ponge.julien.hacks.guiceaspectj.aspects;
 
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
 
@Aspect
public class ContactManagerLogger {
 
    @Before("call( * info.ponge.julien.hacks.guiceaspectj.contact.ContactManager.*(..) )")
    public void methodCalled(JoinPoint thisJoinPoint) {
        System.out.println("Calling: " + thisJoinPoint.getSignature().getName());
    }
 
}

package info.ponge.julien.hacks.guiceaspectj.aspects;
 
import com.google.inject.Inject;
import info.ponge.julien.hacks.guiceaspectj.auth.RequiresProfile;
import info.ponge.julien.hacks.guiceaspectj.auth.UserProfile;
import info.ponge.julien.hacks.guiceaspectj.auth.UserProfileChecker;
import info.ponge.julien.hacks.guiceaspectj.auth.WithUserProfileVerification;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
 
import static info.ponge.julien.hacks.guiceaspectj.auth.UserProfile.ADMIN;
import static info.ponge.julien.hacks.guiceaspectj.auth.UserProfile.USER;
 
@Aspect
public class ProfileVerification {
 
    @Inject
    UserProfileChecker userProfileChecker;
 
    @Before("execution( * *(..) ) && @annotation( required ) && within( @WithUserProfileVerification * )")
    public void verify(RequiresProfile required) {
        UserProfile expected = required.value();
        UserProfile current = userProfileChecker.getCurrentUserProfile();
 
        if (insufficientProfile(expected, current)) {
            throw new RuntimeException("The current user profile (" + current + ") is not sufficient: " + required);
        }
    }
 
    private boolean insufficientProfile(UserProfile required, UserProfile current) {
        return (required == ADMIN && current != ADMIN)
                || (required == USER && (current != USER && current != ADMIN));
    }
 
}

package info.ponge.julien.hacks.guiceaspectj;
 
import com.google.inject.*;
import info.ponge.julien.hacks.guiceaspectj.aspects.ProfileVerification;
import info.ponge.julien.hacks.guiceaspectj.auth.UserProfileChecker;
import info.ponge.julien.hacks.guiceaspectj.auth.dumb.DumbUserProfileChecker;
import info.ponge.julien.hacks.guiceaspectj.contact.ContactManager;
import info.ponge.julien.hacks.guiceaspectj.contact.Person;
import info.ponge.julien.hacks.guiceaspectj.contact.simple.InMemoryContactManager;
import org.aspectj.lang.Aspects;
 
import static org.aspectj.lang.Aspects.*;
 
public class Main {
 
    public static void main(String[] args) {
        new Main().execute();
    }
 
    private Module guiceModule = new AbstractModule() {
        @Override
        protected void configure() {
 
            bind(ContactManager.class)
                    .to(InMemoryContactManager.class)
                    .in(Singleton.class);
 
            bind(UserProfileChecker.class)
                    .to(DumbUserProfileChecker.class)
                    .in(Singleton.class);
 
            requestInjection(aspectOf(ProfileVerification.class));
 
        }
    };
 
    private Injector injector = Guice.createInjector(guiceModule);
 
    private void execute() {
        ContactManager contacts = injector.getInstance(ContactManager.class);
        UserProfileChecker profileChecker = injector.getInstance(UserProfileChecker.class);
 
        profileChecker.login("Julien", "secret");
 
        contacts.add(new Person("Julien Ponge", "julien.ponge@gmail.com"));
        contacts.add(new Person("Jean-Jacques", "jean.jacques@gmail.com"));
 
        profileChecker.logout();
        profileChecker.login("Jean-Jacques", "1234");
 
        System.out.println(contacts.lookup("Julien Ponge"));
 
        profileChecker.logout();
        contacts.add(new Person("Mr Bean", "mrbean@gmail.com"));
    }
 
}