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Date: Fri, 11 Feb 2011 09:57:17 -0600
Message-ID: <AANLkTi=PGciMuy0UP6rEigZ07PwOZTuUB6jY2GN9ZD-d@mail.gmail.com>
Subject: Re: Alternative to if else task.
From: Matt Benson <gudnabrsam@gmail.com>
To: Ant Users List <user@ant.apache.org>
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On Fri, Feb 11, 2011 at 9:49 AM, ritchie <ganesh.devarajulu@baml.com> wrote:

>
> Matt,
>  The target option would be good if the other target does not fail, but in
> my build file i have target which executes perforce command and i capture
> the result of the exec task in resultproperty. If the value of result
> property is ==0 then i execute another target else execute a different
> target.
>
> <target name="testperforce" depends="stage">
>    <exec executable="p4.exe" spawn="false" failonerror="false"
> resultproperty="p4result">
>    <arg value="changes"/>
>    <arg value="-m1"/>
>    <arg value="${file.name}"/>
>    </exec>
>   <if name="p4result" value="0">
>   <antcall target ="p4changes"/>
>   </if>
>   <else>
>   <antcall target="defaultchangenumber"/>
>   </else>
> </target>
>

So:

<target name="-testperforce" depends="stage">
  <exec executable="p4.exe" spawn="false"
failonerror="false" resultproperty="p4result">
    <arg value="changes"/>
    <arg value="-m1"/>
    <arg value="${file.name}"/>
  </exec>
  <condition property="p4success">
    <equals arg1="${p4result}" arg2="0" />
  </condition>
</target>

<target name="testperforce" depends="p4changes,defaultchangenumber" />

<target name="p4changes" depends="-testperforce" if="p4success" ...
<target name="defaultchangenumber" depends="-testperforce"
unless="p4success" ...

See?  This also avoids the expensive antcalls.

Matt


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