--- On Thu, 9/24/09, Stefan Bodewig <bode...@apache.org> wrote:
> From: Stefan Bodewig <bode...@apache.org>
> Subject: Re: if/unless Attributes
> To: dev@ant.apache.org
> Date: Thursday, September 24, 2009, 10:42 AM
> On 2009-09-24, Dominique Devienne
> <ddevie...@gmail.com>
> wrote:
>
> > On Thu, Sep 24, 2009 at 6:32 AM, Stefan Bodewig <bode...@apache.org>
> wrote:
> >> the if/unless attributes for target have changes
> slightly in that they
> >> now may use PropertyHelpers. I.e.
>
> >> <target if="${foo}">
>
> >> will not be executed if ${foo} happens to expand
> to a Boolean instance
> >> with a booleanValue() of "false" and likewise
>
> >> <target unless="${foo}">
>
> >> will be executed in that case. So far this
> hasn't been documented, but
> >> I'll do so shortly.
>
> > That's a pretty big change.
>
> As is the changed PropertyHelper API. In fact Matt
> added that more or
> less at the same time. I just stumbled over it while
> trying to
> understand PropertyHelper 8-)
>
> > What's the exact semantic? Does it depend on the type
> returned, like
> > Boolean, Object, String.
>
> Yes, it only applies to Boolean.
>
> > For String, does that fall back to assuming it's a
> property name that
> > must be checked for existence?
>
> the logic in target is:
>
> * try to evaluate the argument (${foo}) as a property
>
> * if the result is a Boolean, use its booleanValue
>
> * if it is not a Boolean, ignore it completely but instead
> check whether
> a property of the argument's name exists - just like
> in Ant 1.7.1 this
> does not expand ${foo} so it would look literally
> look up a property
> named ${foo}.
>
> > What's the exact timing of the evaluation? Before or
> after depends' targets?
>
> The same as before - at the start of Target#execute, i.e.
> it doesn't
> factor into depends at all.
>
I'm discreet that way. ;)
-Matt
> Stefan
>
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