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Posted to user@ant.apache.org by Horvath Adam <ar...@gmail.com> on 2009/07/09 08:31:35 UTC

test if exists

Hi!

I'm learning ant.

ant -Dpropname=xxx // correct usage
ant // incorrect usage of my build

Can I test a property existence?

if propname not exists (
   echo "Give more command line arg"
   exit ant running
)

Thanks, Adam

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Re: test if exists

Posted by Henk van Voorthuijsen <vo...@xs4all.nl>.

On Thu, 2009-07-09 at 10:13 +0200, Horvath Adam wrote:
> > <fail>
> >  Give more command line arg
> >  <condition>
> >    <isset property="propname"/>
> >  </condition>
> > </fail>

An even simpler way would be:

  <fail unless="propname"/>

See the documentation: http://ant.apache.org/manual/CoreTasks/fail.html

Henk


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Re: test if exists

Posted by Horvath Adam <ar...@gmail.com>.

> <fail>
>  Give more command line arg
>  <condition>
>    <isset property="propname"/>
>  </condition>
> </fail>

Thanks a lot.

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AW: test if exists

Posted by Ja...@rzf.fin-nrw.de.

>ant -Dpropname=xxx // correct usage
>ant // incorrect usage of my build
>
>Can I test a property existence?
>
>if propname not exists (
>   echo "Give more command line arg"
>   exit ant running
>)


You could check that with the <isset> condition.
In that case you would combine it with fail:

<fail>
  Give more command line arg
  <condition>
    <isset property="propname"/>
  </condition>
</fail>

If you can work with default values you can easily set that:
  <property name="propname" value="defaultvalue"/>

Because Ant properties are immutable (once set they cant be changed)
Ant will use the user value (from the command line) if given, otherwise
the default.


For an introduction have a look at the tutorial
http://ant.apache.org/manual/tutorial-HelloWorldWithAnt.html


Jan


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