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Date: Tue, 6 Nov 2001 12:10:35 -0800 (PST)
From: Diane Holt <holtdl@yahoo.com>
Subject: RE: Unset property Value!
To: Ant Users List <ant-user@jakarta.apache.org>
In-Reply-To: <GBEJJKKGLKNCGGMOLGFCAEEPCHAA.ylan@digiworks.tv>
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--- Ylan Segal <ylan@digiworks.tv> wrote:
> That is correct.. once a property is set you can't change it.

Actually, that's not completely true. There are several ways you can
change the value of a property. The more well-known and "legitimate" way,
using <ant>/<antcall> -- any property set within a target executed via an
<ant> or <antcall> is only set during the execution of the
<ant>/<antcall>, or you can change the value of a property already set
within the main execution by passing that property, with a new value, to
the target being called. There's also the less well-known "backdoor" way,
using <available>, testing for something guaranteed to be available (eg.,
the build-file itself).

However, if by "change it" you mean unset it, then that's closer to true;
although, with the introduction of the "inheritAll" attribute in 1.4, you
almost can -- at least within the execution of the <ant>/<antcall>. Or you
could write (say) an <unset> task (hmm, come to think of it, someone might
have submitted just such a task at some point...or I could've just dreamed
it :)

Diane

=====
(holtdl@yahoo.com)



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