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

<project name="forjoe" default="run" basedir=".">

    <target name="clean">

        <delete dir="build"/>

    </target>

    <target name="compile" depends="build"/>

    <target name="build">

        <antcall target="-build-one">

            <param name="version" value="api1.0"/>

        </antcall>

        <echo level="info" message="Compiling the Implementation. This should succeed."/>

        <antcall target="-build-one">

            <param name="version" value="impl"/>

            <param name="cp" location="build/api1.0/classes"/>

        </antcall>

    </target>

    <target name="run" depends="build">

        <echo level="info" message="Instantiating and running Joe's implementation. This should succeed."/>

        <antcall target="-run-one">

            <param name="version" value="api1.0"/>

        </antcall>

    </target>

    <!-- support methods -->

    <target name="-run-one">

        <fail message="You need to specify API version number" unless="version"/>

        <java classpath="build/${version}/classes:build/impl/classes" classname="impl.joe.Main"

            failonerror="true"

        />

    </target>

    <target name="-build-one">

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

        <mkdir dir="build/${version}/classes"/>

        <property name="cp" value=""/>

        <javac 

            srcdir="src-${version}" 

            destdir="build/${version}/classes" 

            source="1.5" target="1.5"

            classpath="${cp}"

        />

    </target>

</project>