Java Tutorial/Ant/Existance Check

Check existance of source code

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  

  <property name="jstl.src" value="jstl"/>
 
  
  <condition property="jstl.src.exists">
    <available file="${jstl.src}" filepath="./src"/>
  </condition>

  <target name="checkout-jstl" unless="jstl.src.exists">
    <echo message="Checking out ${jstl.jar}"/>
  </target>
</project>

Check jar file existance

<?xml version="1.0"?>
<project name="Apache Ant Properties Project" basedir=".">
  
  <property name="jstl.jar" value="jstl.jar"/> 
  
  <condition property="jstl.jar.exists">
    <available file="${jstl.jar}" filepath="./lib"/>
  </condition>
  <target name="build-jstl" depends="checkout-jstl" unless="jstl.jar.exists">
    <echo message="Building ${jstl.jar}"/>
  </target>
</project>