In this case this seems to have done the trick
<target name="pmd_init" depends="init">
<uptodate property="pmd.unnecessary">
<srcfiles dir="${src.dir}" includes="**/*.java"/>
<mapper type="merge" to="${lib.dir}/pmd/pmd_report.xml"/>
</uptodate>
</target>
<target name="pmd" depends="pmd_init" unless="pmd.unnecessary">
<path id="pmd.classpath">
<fileset dir="${pmd.dir}/lib">
<include name="*.jar"/>
</fileset>
</path>
<taskdef name="pmd" classname="net.sourceforge.pmd.ant.PMDTask"
classpathref="pmd.classpath"/>
<mkdir dir="${lib.dir}/pmd"/>
<pmd rulesetfiles="rulesets/favorites.xml">
<formatter type="xml" toFile="${lib.dir}/pmd/pmd_report.xml"/>
<fileset dir="${src.dir}" includes="**/*.java"/>
</pmd>
<xslt in="${lib.dir}/pmd/pmd_report.xml"
style="${pmd.dir}/etc/xslt/wz-pmd-report.xslt"
out="${lib.dir}/pmd/pmd_report.html"/>
</target>
Quoting [EMAIL PROTECTED]:
> So whilst I understand how to use <uptodate> to determine whether .class
> files
> are in sync with .java file etc. How do you do this when you have say a PMD
> or
> checkstyle producing less files than there are classes and you want to only
> reparse the source trees if in fact source has been changed since you last
> ran
> PMD. even if you've compiled since. Then basically have you compare the
> dates
> of the PMD xml file and the dates of all the source files. If any last date
> modified of a source file is more recent than the PMD xml file then you want
> to
> run PMD again. Ideally only on the file that changed but I can live with it
> needing to run it again on all files since it doesn't produce reports per
> file.
>
> ....
>
> How do you structure the targets when you need to compare the timestamps b/w
> two
> different arbitary sets of files?
>
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