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Date: Thu, 29 May 2008 09:00:37 +0200
From: "Gilles Scokart" <gscokart@gmail.com>
To: "Ant Users List" <user@ant.apache.org>
Subject: Re: How can I "conditionall chooise" a target implementation?
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Wouldn't be possible to put an if="use.A" in every target of
lib_A.xml, and have every target of A and B repeated in your generic
with a dependency on the A and B implementation.

Maybe you can also try to play with macro instead of target.  You
replace every target by a macro, and place them in A and B, inside a
<target name="define-macro" if="use.A">.   Then n the generic script
you put some generic target implementation that calls the macro.


2008/5/29 Cyril Sagan <Cyril.Sagan@sas.com>:
> PROBLEM:  I'm trying to develop a general build framework.   In so doing,
>          I need some mechanism for to provide a "conditional implementation"
>          for a target.  We cannot solve this problem using <antcall/>.
>          Can anyone suggest an implementation?
>
>
> Here's a couple ways that I tried, that almost work,... but do not.
>
> All use this simple build.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>      <property file="config.properties" />
>      <import file="common.xml"/>
>  </project>
>
>
> Failing attempt #1:  This almost works, but doesn't because <import/>
> cannot be embedded inside a target!!  arg!
>
> common.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>      <target name="use_lib_A" if="use.A">
>          <!-- sorry, cannot <import/> in a target! -->
>          <import file="lib_A.xml" />  <!-- target "all_impl" defined inside -->
>      </target>
>
>      <target name="use_lib_B" if="use.B">
>          <!-- sorry, cannot <import/> in a target! -->
>          <import file="lib_B.xml" />  <!-- target "all_impl" defined inside -->
>      </target>
>
>      <target name="all"
>              depends="init, use_lib_A, use_lib_B, all_impl" />
>  </project>
>
>
>
> Failing attempt #2:  This would work, if Ant supported property expansion
> in the targets's depends attribute.
>
> common.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>      <import file="lib_A.xml" />
>      <import file="lib_B.xml" />
>
>      <target name="use_lib_A" if="use.A">
>          <property name="use.library" value="lib_A" />
>      </target>
>
>      <target name="use_lib_B" if="use.B">
>          <property name="use.library" value="lib_B" />
>      </target>
>
>      <target name="use_lib_B" if="use.B">
>          <import file="lib_B.xml" />  <!-- target "all_impl" defined inside -->
>      </target>
>
>      <!-- sorry, no property expansion inside attributes! -->
>      <target name="all"
>              depends="init, use_lib_A, use_lib_B, ${use.library}.all_impl" />
>  </project>
>
>
>
> Failing attempt #3:  Almost works, except the depends targets
> always excute...
>
> common.xml:
>  <?xml version="1.0"?>
>  <project name="generic_build" default="all">
>      <import file="lib_A.xml" />
>      <import file="lib_B.xml" />
>
>      <!-- sorry, depends called regardless of if/unless -->
>      <target name="use_lib_A" if="use.A" depends="implementation_A" />
>      <target name="use_lib_A" if="use.B" depends="implementation_B" />
>
>      <target name="all"  depends="init, use_lib_A, use_lib_B"
>  </project>
>
> This gets us closest to what we want, and would suffice if we could
> tolerate the <antcall/>:
>      <target name="use_lib_A" if="use.A">
>          <antcall target="implementation_A" />
>      </target>
>
> ...but we can't use antcall because it re-reads the *entire* build
> file.  There's some fairly complicated init (that we don't have
> control of) that doesn't tolerate being called multiple times.
>
> I'd appreciate any suggestions from the experts!
>
> Thanks.
>
> --Cyril
>
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>



-- 
Gilles Scokart

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