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From: Dominique Devienne <DDevienne@lgc.com>
To: "'Ant Users List'" <user@ant.apache.org>
Subject: RE: How to create paths that depend on a condition?
Date: Sun, 23 May 2004 18:14:56 -0500
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> From: Vincent Massol [mailto:vmassol2@pivolis.com]
> 
> Ok, I've found a solutiob but it looks really ugly:
> 
> <dirset dir="${src.test.dir}/share-13-14">
>   <and>
>     <filename name="share-13-14"/>
>     <or>
>       <selector if="j2ee13.available"/>
>       <selector if="j2ee14.available"/>
>     </or>
>   </and>
> </dirset>
> 
> Any better solution?

Maybe... If I understand correctly, you want to include the share-12-13-14
path element only if either j2ee1[34]* properties are defined. I haven't
tested this, but I think I remember the 'path' attribute of <pathelement>
will accept an empty value, simply ignoring it. So

<condition property="j2ee1[34].srcdir"
           value="${src.test.dir}/share-13-14">
  <or>
    <isset property="j2ee13.available" />
    <isset property="j2ee14.available" />
  </or>
<condition>
<property name="j2ee1[34].srcdir" value="" />

<javac [...]>
  <src>
    <pathelement location="${src.test.dir}/share-12-13-14"/>
    <pathelement path="${j2ee1[34].srcdir}"/>
  </src>
</javac>

Should do what you want, is easy enough to read, and is pure Ant. --DD

<usual-lamentation>
I'd rather have if/unless on all Ant elements, as I lament often,
rather than rely on knowledge of edge cases behavior in <pathelement>
though. I've created for my own task a Path-derivative that accepts
nested <element>s, with built-in if/unless/iftrue/unlessTrue/os/osFamily
condition attributes, but it's only really useful in my own tasks only,
unless you id/refid that Path, or when using the semi-official ant:type
magic attribute (which still works only with tasks with add*(Path),
and not the ones using create*(Path)).

Anyways, I think your use case is yet more evidence for the usefulness
of generalized if/unless.
</usual-lamentation>

> > -----Original Message-----
> > From: Vincent Massol [mailto:vmassol2@pivolis.com]
> >
> > I'd like to create a <path> that depends on some property being
> > defined or not. This is for putting inside the <javac> task.
> > I cannot find the right combination. Here's what I'd like to do:
> >
> >     <javac [...]>
> >       <src>
> >         <pathelement location="${src.test.dir}/share-12-13-14"/>
> > ---> start here
> >         <dirset dir="${src.test.dir}/share-13-14">
> >           <and>
> >             <depth max="0"/>
> >             <or>
> >               <selector if="j2ee13.available"/>
> >               <selector if="j2ee14.available"/>
> >             </or>
> >           </and>
> >         </dirset>
> > ---> stop here

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