<?xml version="1.0" encoding="UTF-8"?>

<project name="Downloads necessary libraries" default="libraries" basedir=".">

    <target name="clean">

        <delete dir="dist"/>

    </target>

    <target name="libraries">

        <antcall target="-library">

            <param name="library" value="junit-4.4"/>

            <param name="url" value="http://switch.dl.sourceforge.net/sourceforge/junit/junit-4.4.jar"/>

        </antcall>

    </target>

    <!-- support methods -->

    <target name="-library-check">

        <fail message="You need to specify library name" unless="library"/>

        <fail message="You need to specify url" unless="url"/>

        <property name="library.jar" location="dist/${library}.jar"/>

        <echo message="Checking for ${library.jar}"/>

        <available file="${library.jar}" property="library.available"/>

    </target>

    <target name="-library" depends="-library-check" unless="library.available">

        <mkdir dir="dist"/>

        <get dest="${library.jar}" src="${url}"/>

        <fail message="Now the library ${library} should be downloaded">

            <condition>

                <not><available file="${library.jar}"/></not>

            </condition>

        </fail>

    </target>

</project>