CODEWITHSUNDEEP
javaaopaspectj
punkyduck
punkyduck

Reputation: 719

AspectJ: Access private fields?

I want to use an aspect to add getter and setter for a private id field. I know how to add a method through an aspect, but how can I access the private id field?

I thoght that I just have to make the aspect provileged. I tried the following code, but the aspect cannot access the id field. 

public privileged aspect MyAspect {

public String Item.getId(){

    return this.id;
}

A possibility would be to user reflection like shown in this blog post: http://blog.m1key.me/2011/05/aop-aspectj-field-access-to-inejct.html

Is reflection the only possibility or is there a way to do it with AspectJ?

Upvotes: 5

Views: 5615

Answers (1)

anjosc
anjosc

Reputation: 973

Are you sure you can't ? I just tested and it ran. Here's my full code:

package com.example;

public class ClassWithPrivate {
    private String s = "myStr";
}

==========

package com.example.aspect;

import com.example.ClassWithPrivate;

privileged public aspect AccessPrivate {

    public String ClassWithPrivate.getS() {
        return this.s;
    }

    public void ClassWithPrivate.setS(String str) {
        this.s = str;
    }
}

==========

package com.example;

public class TestPrivate {

    public static void main(String[] args) {

        ClassWithPrivate test = new ClassWithPrivate();
        System.out.println(test.getS());
        test.setS("hello");
        System.out.println(test.getS());
    }
}

If for some reason, that does not work for you, you can use reflection, or another way as described here: https://web.archive.org/web/20161215045930/http://blogs.vmware.com/vfabric/2012/04/using-aspectj-for-accessing-private-members-without-reflection.html However, according to the benchmarks, it may not be worth it.

Upvotes: 8

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