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From: "Hari  Kodungallur" <hkodungallur@rediffmail.com>
Reply-To: "Hari  Kodungallur" <hkodungallur@rediffmail.com>
To: "Ant Users List" <ant-user@jakarta.apache.org>
Subject: Re: conditions and property's
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actually, it will be very helpful for me also to know whether we 
can unset a property.

scott, however, you can use the <if> task provided by ant-contrib 
(its on sourceforge http://sourceforge.net/projects/ant-contrib) 
as a work around. thats what i am doing now

say the value of the property "this.target.built" can be either 
"true" or "false"

then you can do something like

<if>
     <equals arg1="${this.target.built}" arg2="true"/>
     <then>
         ...
     </then>
     <else>
         ...
     </else>
</if>

-hk




On Wed, 13 Nov 2002 Klein, Scott @ TW wrote :
>OK. So I have determined that Ant is currenty not capable of 
>doing the
>following within a single task (if I'm wrong, please correct 
>me):
> 	if condition exists, do stuff
> 	else stop executing script
>
>however, in order to make my targets re-useable for a variety of 
>purposes I
>require my properties to be UNset after they are checked:
> 	<target name="checkErrorForFoo" unless="bar">
> 		<fail />
> 	</target>
>
> 	<target name="foo" if="bar">
> 		.. do some stuff ..
> 		?? unset the property bar ??
> 	</target>
>
> 	<target name="foobar">
> 		<condition name="bar">
> 			.. whatever ..
> 		</condition>
> 		<antcall target="checkErrorForFoo">
> 		<antcall target="foo">
>
> 		<condition name="bar">
> 			.. whatever ..
> 		</condition>
> 		<antcall target="checkErrorForFoo">
> 		<antcall target="foo">
> 	</target>
>
>So I only want target "foo" to execute under certain conditions, 
>however
>once the property is set there is no way to unset it. Say I want 
>foo to be
>copyFile then I need to have copyFileForTarget1 
>copyFileForTarget2 - plus
>all of the properties and error checks (which is another 
>story).
>
>I've read that something much easier is being promised in Ant2, 
>but
>shouldn't simple logic be supported already? It just seems 
>strange to me
>that it is not.
>
>Anyway, if there is a simple solution to this that I've missed I 
>would love
>to hear about it.
>
>
>thanks
>scott
>
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