I don't know for sure that I completely understood what you're wanting to
do, so the following is just an example of if/then/else'ing in Ant.
This example uses "standard" Ant:
<target name="doit">
<antcall target="copyfiles">
<param name="file" value="foo"/>
</antcall>
<antcall target="copyfiles">
<param name="file" value="bar"/>
</antcall>
<antcall target="copyfiles">
<param name="file" value="blat"/>
</antcall>
</target>
<target name="copyfiles" depends="copyIfAvailable,copyIfNotAvailable"/>
<target name="copyIfAvailable" depends="chkFile" if="isAvailable">
<echo>${file}.txt is available...</echo>
</target>
<target name="copyIfNotAvailable" depends="chkFile"
unless="isAvailable">
<echo>${file}.txt is not available...</echo>
</target>
<target name="chkFile">
<available property="isAvailable" file="${file}.txt"/>
</target>
Note: You don't need the 'depends' for the "copyIfNotAvailable" target,
unless you want to be able to use it standalone (ie., called directly,
rather than as a dependency of the "copyfiles" target).
This example uses the ant-contrib <foreach> and <if> tasks (which require
Ant1.5alpha):
<target name="doit">
<foreach list="foo,bar,blat" target="copyfiles" param="file"/>
</target>
<target name="copyfiles">
<available property="isAvailable" file="${file}.txt"/>
<if>
<istrue value="${isAvailable}"/>
<then>
<echo>${file}.txt is available...</echo>
</then>
<else>
<echo>${file}.txt is not available...</echo>
</else>
</if>
</target>
Both end up with the same results, so it's really just a matter of which
you prefer (personally, I prefer the second, since it's more compact and,
I think, clearer). Note: For this type of thing, I recommend using
NoBannerLogger, so you don't end up with bunches of empty targets being
logged:
$ ant -f call.xml
copyIfAvailable:
[echo] foo.txt is available...
copyIfAvailable:
[echo] bar.txt is available...
copyIfNotAvailable:
[echo] blat.txt is not available...
$ant -f if.xml
copyfiles:
[echo] foo.txt is available...
copyfiles:
[echo] bar.txt is available...
copyfiles:
[echo] blat.txt is not available...
Hope this helps,
Diane
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