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Use mapper to map a file

<?xml version="1.0"?> <project name="Apache Ant Properties Project" basedir=".">      <fileset dir="." id="uptodate.id">     <include name="src/jstl/One.java"/>   </fileset>   <condition property="uptodate">     <uptodate>       <srcfiles refid="uptodate.id"/>       <mapper type="merge" to="./One.java"/>     </uptodate>   </condition>   <target name="compile" if="uptodate">     <echo message="File changed: ${uptodate}"/>   </target> </project>