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.
Stefan
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