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From "Erik Hatcher" <jakarta-...@ehatchersolutions.com>
Subject Re: newbie - if-then-else task?
Date Mon, 03 Dec 2001 20:16:07 GMT
Ha!  I knew I'd find a way to get a correction on Diane if I waited long
enough :)

Actually the back-door hack for <available> is being left in (just with a
nasty message if you overwrite a propertys value using it) - that was the
curreent consensus, unfortunately.  This may change before the release of
1.5, but thats how it exists in the nightly builds now though.

    Erik "crossing my fingers that I got this answer right"


----- Original Message -----
From: "Diane Holt" <holtdl@yahoo.com>
To: "Ant Users List" <ant-user@jakarta.apache.org>
Sent: Monday, December 03, 2001 2:58 PM
Subject: Re: newbie - if-then-else task?


> You can use <available>. It doesn't "just set a flag" -- you can assign
> any value to the property it's (potentially) setting, so have the value be
> the path to the file it finds, then reference that property in your <copy>
> task.
>
> If you can use a nightly build rather than a release, you can do this more
> easily, since, if the local file was found and therefore the
> filename-property was set to that, the second check (the one for the
> system file) won't (now) overwrite the value of the filename-property. If
> you need to use a release, you'll need to do it in a couple of more steps,
> but it's still quite doable.
>
> Diane
>
> --- Russ Fink <russfink@hotmail.com> wrote:
> > Hello,
> >
> > I'm new at Ant and I will describe what I want to do -- followed with
> > how I
> > hope to do it.
> >
> > I'm trying to copy files from two sources, a system directory followed
> > by a
> > local directory.  This is prior to a build, and I'm modifying an
> > existing
> > build file.  What I want is to copy a file from a system directory, and
> > if a
> > file exists in a similar local structure, I want to copy that version.
> > Both
> > destinations are the same, i.e., a
> > generated directory.
> >
> > I tried using the <copy> target to copy from the system location first,
> > then
> > the local directory second, and the problem is that the build fails if
> > it
> > doesn't find the file in the local directory.
> >
> > How I want to do this is to use conditional logic.  Basically, if the
> > local
> > file exists, I want to use it, but if it doesn't exist, I want to use
> > the
> > system copy.
> >
> > Questions.  Is this how you would do it?  If so, what is the method for
> > <if-then-else> or what can I use?
> >
> > I can't easily do this with <available>, since all that does is set a
> > flag,
> > which apparently can only be used in the <target> line.  What I want is
> > within a target, being able to evaluate a tag and take some action.
> >
> > I'm open to suggestions - Thanks,
> > Russ
> >
> > PS: the manual is very good, but it would be much better if there were
> > an
> > index in it somewhat similar to Javadocs.
> >
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at
> > http://explorer.msn.com/intl.asp
> >
> >
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>
>
> =====
> (holtdl@yahoo.com)
>
>
>
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