Re: [macker-user] detect class that implements 2 interfaces

[Paul C. <can...@po...>]

Oops! I realize I forgot to post my reply to Etienne to the list! Sorry.

Just use nested includes:

     <include filter="subtype-of" class="Alpha">
         <include filter="subtype-of" class="Beta" />
     </include>

Read the docs -- nested includes make a boolean AND:

     http://innig.net/macker/guide/pattern.html#nesting

Michael -- I'm not sure your approach below actually works. Perhaps  
you meant that last pattern to read as follows:

     <pattern name="classes-implementing-Alpha-and-Beta">
         <include filter="subtype-of" class="Alpha" />
         <include filter="subtype-of" class="Beta" />
         <exclude pattern="classes-implementing-only-Alpha" />
         <exclude pattern="classes-implementing-only-Beta" />
     </pattern>

Regardless, nesting is a *far* simpler way to do this.

Cheers,

Paul


On Oct 19, 2005, at 9:34 AM, Michael Sassin wrote:

> Hi
>
> I found a solution for this a while back that is clunky but will  
> work. Underlying the idea is that if you have tow sets A and B and  
> want to now the set of A AND B you can write this also as
>
>         A AND B = (A+B) - ( (A - B) + (B-A)
>
> The operations "-" and "+" relate to exclude and include operations  
> in Macker. So, as a result you can express your problem as
>
> <pattern name="classes-implementing-only-Alpha">
>         <include filter="subtype-of" class="Alpha" />
>         <exclude filter="subtype-of" class="Beta" />
> </pattern>
>
> <pattern name="classes-implementing-only-Beta">
>         <include filter="subtype-of" class="Beta" />
>         <exclude filter="subtype-of" class="Alpha" />
> </pattern>
>
> <pattern name="classes-implementing-only-Beta">
>         <include filter="subtype-of" class="Alpha" />
>         <include filter="subtype-of" class="Beta" />
>         <include pattern="classes-implementing-only-Alpha" />
>         <include pattern="classes-implementing-only-Beta" />
> </pattern>
>
> Michael

On Oct 18, 2005, at 10:12 PM, Etienne Studer wrote:
> Hi
>
> What kind of macker rule do I have to write to detect all classes  
> that implement interface Alpha AND interface Beta.
>
> For example,
>
> class X implements Alpha, Beta {
>   ...
> }
>
> Thanks for any help.
>
> --Etienne
>
> P.S. Btw, macker is awesome and we couldn't be without it anymore!