Using Ant to test if a file exist

<project name="appDeployment" basedir="." default="run">
 <target name="checkSearchIndexZipFile">
  <available file="C:\temp\jaf-1.0.2\activation.jar" property="searchFile.exists"/> 
 </target>
 <target name="test" if="searchFile.exists" >
  <echo> running ...</echo>
 </target>
 <target name="run" depends="checkSearchIndexZipFile,test"/>
</project>