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Adding an interace to class based on it implementing a interface. [message #56321]

Wed, 31 August 2005 18:04

Chris Rudd

Messages: 4
Registered: July 2009

Junior Member

Is it possibly to create a static crosscut that says "any class implementing
interface X, implements interace Y as well".

class Foo implements X
{
}

public aspect ImplementY {
declare parents : X extends Y;
};

The above changes X to implement Y, when I only want Foo to implement Y.
Using implements instaed of extends makes no different either.

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Re: Adding an interace to class based on it implementing a interface. [message #56346 is a reply to message #56321]

Wed, 31 August 2005 18:58

Eclipse User

Originally posted by: adrian_colyer.uk.ibm.com

Chris Rudd wrote:
> Is it possibly to create a static crosscut that says "any class implementing
> interface X, implements interace Y as well".
>
> class Foo implements X
> {
> }
>
> public aspect ImplementY {
> declare parents : X extends Y;
> };
>
> The above changes X to implement Y, when I only want Foo to implement Y.
> Using implements instaed of extends makes no different either.
>
>
>
>
>

Yes, the trick is to write a type pattern that matches subtypes
(implementors) of X, but not X itself.

declare parents: (X+ && !X) implements Y;

should do the trick.

Regards, Adrian.

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Re: Adding an interace to class based on it implementing a interface. [message #56385 is a reply to message #56346]

Thu, 01 September 2005 17:40

Chris Rudd

Messages: 4
Registered: July 2009

Junior Member

Yup. Figured that out late last night. Thx for the reply.

"Adrian Colyer" <adrian_colyer@uk.ibm.com> wrote in message
news:df4uk0$tut$1@news.eclipse.org...
> Chris Rudd wrote:
> > Is it possibly to create a static crosscut that says "any class
implementing
> > interface X, implements interace Y as well".
> >
> > class Foo implements X
> > {
> > }
> >
> > public aspect ImplementY {
> > declare parents : X extends Y;
> > };
> >
> > The above changes X to implement Y, when I only want Foo to implement Y.
> > Using implements instaed of extends makes no different either.
> >
> >
> >
> >
> >
>
> Yes, the trick is to write a type pattern that matches subtypes
> (implementors) of X, but not X itself.
>
> declare parents: (X+ && !X) implements Y;
>
> should do the trick.
>
> Regards, Adrian.

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Re: Adding an interace to class based on it implementing a interface. [message #589969 is a reply to message #56321]

Wed, 31 August 2005 18:58

Adrian Colyer

Messages: 61
Registered: July 2009

Member

Chris Rudd wrote:
> Is it possibly to create a static crosscut that says "any class implementing
> interface X, implements interace Y as well".
>
> class Foo implements X
> {
> }
>
> public aspect ImplementY {
> declare parents : X extends Y;
> };
>
> The above changes X to implement Y, when I only want Foo to implement Y.
> Using implements instaed of extends makes no different either.
>
>
>
>
>

Yes, the trick is to write a type pattern that matches subtypes
(implementors) of X, but not X itself.

declare parents: (X+ && !X) implements Y;

should do the trick.

Regards, Adrian.

Report message to a moderator

Re: Adding an interace to class based on it implementing a interface. [message #589982 is a reply to message #56346]

Thu, 01 September 2005 17:40

Chris Rudd

Messages: 4
Registered: July 2009

Junior Member

Report message to a moderator

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