Re: [aspectj-users] Filed set after constructor

[Matthew Webster <matthew_webster@xxxxxxxxxx>]

Andre,

So what you are trying to do is add a field and initialize it based on an
argument passed on an existing constructor. This is a little unusual as you
would probably ITD a new constructor too however here is an example (using
the execution rather than call PCD):

   public class Test {

      public Test (String s) {
      }

      public static void main(String[] args) {
            Test test = new Test("One");
            System.out.println(test.getString());
      }
   }

   aspect Aspect {

      private String Test.string;

      public String Test.getString () {
            return string;
      }

      pointcut init (Test t, String s) :
            this(t) && execution(Test.new(..)) && args(s,..);

      before (Test t, String s) : init (t,s) {
            t.string = s;
      }
   }

Matthew Webster
AOSD Project
Java Technology Centre, MP146
IBM Hursley Park, Winchester,  SO21 2JN, England
Telephone: +44 196 2816139 (external) 246139 (internal)
Email: Matthew Webster/UK/IBM @ IBMGB, matthew_webster@xxxxxxxxxx
http://w3.hursley.ibm.com/~websterm/

André Dantas Rocha <ad-rocha@xxxxxxxxxx>@eclipse.org on 12/01/2005 22:36:28

Please respond to aspectj-users@xxxxxxxxxxx

Sent by:    aspectj-users-admin@xxxxxxxxxxx


To:    <aspectj-users@xxxxxxxxxxx>
cc:
Subject:    [aspectj-users] Filed set after constructor


Hi,

I'm introducing a new filed in a class and I want to set it after
construtor runs. Somethig like this:

  // introduced field
  String AClass.expressao;

  // introduced method
  public String AClass.getExpressao() {
    return expressao;
  }

  pointcut pc() : call(AClass.new(..));

  after() : pc() {
    AClass ac = (AClass) thisJoinPoint.getTarget();
    ac.expressao = thisJoinPoint.getArgs()[0];
  }

But... thisJoinPoint.getTarget() returns null.

Is there a way to make it works?

Thanks,

Andre