Try selectors.
Example:
- create two files (echo . > lib1.txt)
lib1.txt : symbol for a library
lib1b.txt : symbol for a library depending on lib1
- copy the code provided into a build.xml
- run ant
Buildfile: build.xml
[echo] Path:
[echo] - C:\TEMP\ant-conditionalSelector\build.xml
[echo] - C:\TEMP\ant-conditionalSelector\lib1.txt
[echo] - C:\TEMP\ant-conditionalSelector\lib1b.txt
- rename lib1.txt into lib1.txt.old
- rerun ant
Buildfile: build.xml
[echo] Path:
[echo] - C:\TEMP\ant-conditionalSelector\build.xml
Jan
---8-<-------8-<-------8-<-------8-<-------8-<-------8-<-------8-<-------8-<----
<project>
<!-- check if the 'base' file is there -->
<available property="lib1.present" file="lib1.txt"/>
<!-- all files which depend on 'base' -->
<selector id="needs.lib1">
<or>
<filename name="lib1*.txt"/>
</or>
</selector>
<!-- files without any dependency -->
<selector id="needs.nothing">
<or>
<filename name="build.xml"/>
</or>
</selector>
<!-- the path with all 'valid' files -->
<path id="p">
<fileset dir=".">
<or>
<selector refid="needs.lib1" if="lib1.present"/>
<selector refid="needs.nothing"/>
</or>
</fileset>
</path>
<!-- print the result -->
<pathconvert property="p.value" refid="p" pathsep="${line.separator}- " />
<echo>Path:${line.separator}- ${p.value}</echo>
</project>
---8-<-------8-<-------8-<-------8-<-------8-<-------8-<-------8-<-------8-<----
>-----Ursprüngliche Nachricht-----
>Von: Com Pegasus-CC-Hotline
>[mailto:[EMAIL PROTECTED]
>Gesendet: Montag, 19. Dezember 2005 11:56
>An: user@ant.apache.org
>Betreff: How to conditionally add something to a path ?
>
>Hello,
>
>I am trying to add an entry to a path, if some other entry is
>not existant. I'm trying since hours now,=20 without success.
>I am somewhere here:
>
>
> <available file=3D"${jarpath}/**/jacorb*.jar"
>property=3D"jacorb.present"/>
>
> <path id=3D"classpath">
> <fileset dir=3D"${jarpath}">
> <include name=3D"**/*.jar" />
> <exclude name=3D"orbacus.jar" />
> </fileset>
> <if>
> <isfalse property=3D"${jacorb.present}" />
> <fileset dir=3D"${jarpath}">
> <include name=3D"orbacus.jar" />
> </fileset>
> </if>
> </path>
>
>... but it doesn't work. A fileset doesn't accept a if inside,
>and a if does not accept a fileset inside, and so on ...
>
>How can I do this???
>
>Thomas
>
>
>PS: I also found http://ant-contrib.sourceforge.net/fileset.html
>but it just "didn't" work. (I downloaded/placed the contrib
>jar and added the line <taskdef
>resource="net/sf/antcontrib/antcontrib.properties">
>but it still said, that the fileset doesnt know the "unless".)
>
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