Re: [aspectj-users] Turning one annotation into many annotations with As

[Andy Clement <andrew.clement@xxxxxxxxx>]

Hi,

I'm afraid you can't do that with AspectJ right now, you can't pass a
piece of the matched information to the new annotation.  I can perhaps
imagine some hypothetical syntax:

declare @field:
@SortedOneToMany(sort=SortType.COMPARATOR,comparator={1}) * * :
@Sort(type=SortType.COMPARATOR,comparator={1});

which would seem to achieve what you want.

Maybe raise an enhancement request for it:
https://bugs.eclipse.org/bugs/enter_bug.cgi?product=AspectJ

sorry I don't have better news.

cheers
Andy

On 11 May 2011 13:55, Adam Howard <howard.adam@xxxxxxxxx> wrote:
> I've asked this question on StackOverflow and have not gotten an answer
> after 115 views so I thought
> I would ask here. You can post your answer on SO too if you'd like the rep.
> http://stackoverflow.com/questions/5901690/turning-one-annotation-into-many-annotations-with-aspectj
> I have discovered a pattern in my JPA mappings that I would like to codify.
> A simple example follows:
>     @OneToMany(fetch=FetchType.EAGER)
>     @Sort(type=SortType.NATURAL)
>     private SortedSet<Item> items;
> I would like to create a single annotation called SortedOneToMany that I can
> apply to the above set:
>     public @interface SortedOneToMany {
>         FetchType fetch() default EAGER;
>         SortType sort() default NATURAL;
>         Class comparator() default void.class;
>     }
> I have written the following aspect to "attach" the JPA annotations whenever
> it sees my annotation:
>     public aspect SortedOneToManyAspect {
>         declare @field: @SortedOneToMany * * :
> @OneToMany(fetch=FetchType.EAGER);
>         declare @field: @SortedOneToMany * * : @Sort(type=SortType.NATURAL);
>     }
> But I don't know how can I access the values of the SortedOneToMany
> annotation parameters and use them when defining the OneToMany and Sort
> annotations. There may be cases where I want to change one of the default
> values like so:
>
> @SortedOneToMany(sort=SortType.COMPARATOR,comparator=ItemComparator.class)
>     private SortedSet<Item> items;
> So how can I pass the annotation values from SortedOneToMany to the Sort
> annotation?
> Thanks.
> --
> Adam
>
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