Leveraging Annotations

Hey all,

First,
I want to use a "presentation-only" compiler to try to pull out some annotations (StaticAnnotations) from classes.  I was wondering where I should look in the compiler/other open-source projects for some sample code.  Also, is this approach reasonable, or is there an easier approach? 

Second,
Is there a way to have optional arguments for a scala annotation class?  I tried something like the following:

class parameter extends StaticAnnotation {
   val expression : Option[String] = None;
}

class TestMojo {
   @parameter{ override val expression = Some("${project}")
   var project: MavenProject = _
   @parameter
   var other = _
}

Any suggestions? (besides reverting to defining the annotations in java)


Thanks,
-Josh

Just a thought, but one hack you could try to clean up your workaround would be an implicit conversion as follows:

implicit def allToSome[A](a: A) = Some(a)

On Sun, Dec 21, 2008 at 9:11 PM, Josh Suereth <joshua.suereth@gmail.com> wrote:

Hey all,

First,
I want to use a "presentation-only" compiler to try to pull out some annotations (StaticAnnotations) from classes.  I was wondering where I should look in the compiler/other open-source projects for some sample code.  Also, is this approach reasonable, or is there an easier approach? 

Second,
Is there a way to have optional arguments for a scala annotation class?  I tried something like the following:

class parameter extends StaticAnnotation {
   val expression : Option[String] = None;
}

class TestMojo {
   @parameter{ override val expression = Some("${project}")
   var project: MavenProject = _
   @parameter
   var other = _
}

Any suggestions? (besides reverting to defining the annotations in java)


Thanks,
-Josh