Re: [aspectj-users] Implementing abstract pointcut that includes no join

["Wes Isberg" <wes@xxxxxxxxxxxxxx>]

Declare nothing:

  aspect A extends AA { 
    protected pointcut defineme(); // matches no join points
    protected pointcut andme() : execution(public * *(..));
  }

Wes

> ------------Original Message------------
> From: Ken Pelletier <ken@xxxxxxxx>
> To: aspectj-users@xxxxxxxxxxx
> Date: Thu, Oct-20-2005 10:05 PM
> Subject: [aspectj-users] Implementing abstract pointcut that includes no joinpoints
>
> I have an abstract aspect that declares a couple of abstract  
> pointcuts to be overridden in concrete subclasses.
> 
> In a particular subclass, however I want to nullify one of those  
> pointcuts; include no joinpoints at all.
> 
> Is there a common idiom for implementing a concrete pointcut that  
> explicitly includes no joinpoints?
> 
> I know I can nullify with && if(false), but it smells funny to  
> declare any advice type at all if really none applies.
> 
> Eg:
> 
> protected overriddenAbstractPointcut() :  
> <what_would_advice_spec_be_here> && if(false;
> 
> Regards,
> 
> - Ken
> 
> PS: it's probably a design smell in the first place to have abstract  
> pointcuts that sometimes have no applicable concrete implementation,  
> but that's another matter.  :-)
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