Hi Cyril,
I would suggest using the <if><then><else> from ant-contrib, at the
project root level... It changed my life the day I started using it, and
no more complicated target-based frameowrk with 'if' and 'unless'
attributes everywhere.
Hope this helps,
BR
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-------- Original Message --------
Subject: How can I "conditionall chooise" a target implementation?
From: Cyril Sagan <[EMAIL PROTECTED]>
To: Ant Users List <user@ant.apache.org>
Date: 29/05/2008 06:27
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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