I have 3 classes. User, RoleRef, Role

public class User {

 public void setId(int id) {
 ...
 }

 public int getId() {
 return ...;
 }

}

public class Role {

 public void setId(int id) {
 ...
 }

 public int getId() {
 return ...;
 }

}

public class RoleRef {

 private User user;
 private Role role;

 public User getUser() {
 return user;
 }

 public Role getRole() {
 return role;
 }

 public void setUser(User user) {
 this.user = user;
 }

 public void setRole(Role role) {
 this.role = role;
 }

 public boolean equals(Object o) {
 if(o == this) {
 return true;
 } else if(o == null) {
 return false;
 } else if(o instanceof RoleRef) {
 RoleRef referrence = (RoleRef) o;
 return user.equals(referrence.user) && role.equals(referrence.role);
 } else {
 return false;
 }
 }

}

The mapped tables are respective role, roleref, user.

Now assume that I have an instance of User, how can I write criteria code which is the same as sql expression as below.

"select role.* from user, roleref, role where user.id = roleref.uid && roleref.rid = role.id".