Re: [aspectj-users] OnType Variables For Inter-Type Declarations

[Andy Clement <andrew.clement@xxxxxxxxx>]

Hi Jared,

Currently OnType must be a specific type - I have thought about
enabling it to be a type variable (declared in the aspect definition)
but haven't had the time to do anything about that yet.  If you want
to ITD on a bunch of types the pattern is usually like this:

interface Marker {}

public void Marker.someMethod() { }

declare parents: (@Something *) implements Marker;

You can see that varying the declare parents pattern will cause the
ITD to apply to a number of types.

However, that doesn't address precisely what you asked - applying it
to the class(es) affected by an aspect.  Right now you would have to
have some duplication because we don't have named type patterns.  So
your :

>    public aspect InstanceTracking pertypewithin(org.xyz..*) {
>        public static final String getWithinTypeName().typeName =
> getWithinTypeName();
>    }

could be:
public aspect InstanceTracking pertypewithin(org.xyz..*) {

  declare parents: org.xyz..* implements Marker; // duplicating the
org.xyz..* string

  interface Marker {}

  public void Marker.method() {}

}

cheers
Andy

On 29 April 2011 15:13, Jared D. Cottrell <jcottr@xxxxxxxxx> wrote:
> Is it possible to use variables or wildcards in the OnType expression
> in an inter-type declaration?
>
>    Modifiers Type OnType . Id [ = Expression ] ;
>
> The desire is to add a member to whichever class or classes the aspect
> is applied to.  All the examples I could find, however, explicitly
> name the OnType.  Perhaps this can be done in combination with
> pertypewithin as in the example below?
>
>    public aspect InstanceTracking pertypewithin(org.xyz..*) {
>        public static final String getWithinTypeName().typeName =
> getWithinTypeName();
>    }
>
> Cheers!
>
>
> Jared
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