Re: [aspectj-users] Can not retrieve information from the passing parame

[Dan Silcox <dsilcox69@xxxxxxxxx>]

Ok..just so you know I'm also a newbie..but seems like you could change your pointcut strategy to give yourself access to the class using target instead of args.  Then you could introduce

methods on that class like getVector() and getUserInfo()...You would still achieve your results - the class itself would never know about the access control.

lily lily <lixiaojiao@xxxxxxxxxxx> wrote:

> Hi:
> I am working on a web application of a database. JSPs provide the 
> presentation logic, Java Servlets provide control to the flow of data, Java 
> Beans do the actual data access to the database. Now I want to add an access 
> control to it using aspectJ.
>
> The accsss control code is like this:
>
> ---------------------------------------------------------------------------------------
> package tables;
>
> import java.io.*;
> import java.util.*;
>
> aspect AccessControl perthis(checkpoint(Vector))
> {
> pointcut checkpoint(Vector v): execution(public String 
> project.insert(Vector)throws ClassNotFoundException) && args(v);
>
> String around(Vector v): checkpoint(v)
> {
> check the access availability, if true
> return proceed(v);
> otherwise,
> return "NotAllowed";
> }
> }
> --------------------------------------------------------------------------------------
>
> The problem is that when I do the access control, I need some user 
> information like user's name, user's ID to determine the result. But I 
> could not get such information from the passing parameters of method 
> project.insert. I could add another parameter called say 'UserInfo' to the 
> project.insert method in order to retrieve the user information. But this is 
> not what I want. I do not want to touch any of the project.insert code. This 
> will make Plugging and Unplugging the access control easily in the furture. 
> The programmer of method project.insert does not even realize that the 
> access control exists.
>
> Is this possible? How to solve it?
>
> Thanks in advance.
>
> Lily
>
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