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

 <project name="co-contra-variance" default="run" basedir=".">

     <target name="clean">

         <delete dir="build"/>

     </target>

     <target name="test" depends="run"/>

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

     <target name="build">

         <antcall target="-build-one">

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

         </antcall>

         <antcall target="-build-one">

             <param name="version" value="api2.0"/>

         </antcall>

         <echo level="info" message="Compiling the test against Version 1.0 of the API. This should succeeds."/>

         <antcall target="-build-one">

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

             <param name="output" value="impl-with-1.0"/>

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

         </antcall>

         <echo level="info" message="Compiling the test against Version 2.0 of the API. This should succeeds."/>

         <antcall target="-build-one">

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

             <param name="output" value="impl-with-2.0"/>

             <param name="cp" location="build/api2.0/classes"/>

         </antcall>

     </target>

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

         <echo level="info" message="Running the test compiled with version 1.0 of the API against version 1.0 of the API. This should succeeds."/>

         <antcall target="-run-one">

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

             <param name="testversion" value="impl-with-1.0"/>

             <param name="result" value="0"/>

         </antcall>

         <echo level="info" message="Running the test compiled with version 2.0 of the API against version 2.0 of the API. This should succeeds."/>

         <antcall target="-run-one">

             <param name="version" value="api2.0"/>

             <param name="testversion" value="impl-with-2.0"/>

             <param name="result" value="0"/>

         </antcall>

         <echo level="info" message="Mixing should not work: Running the test compiled with version 1.0 of the API against version 2.0 of the API. This should fail."/>

         <antcall target="-run-one">

             <param name="version" value="api2.0"/>

             <param name="testversion" value="impl-with-1.0"/>

             <param name="result" value="1"/>

         </antcall>

         <echo level="info" message="Mixing does not work: Running the test compiled with version 2.0 of the API against version 1.0 of the API. This should fail."/>

         <antcall target="-run-one">

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

             <param name="testversion" value="impl-with-2.0"/>

             <param name="result" value="1"/>

         </antcall>

     </target>

     <!-- support methods -->

     <target name="-run-one">

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

         <java classpath="build/${version}/classes:build/${testversion}/classes" classname="test.ContravarianceTest"

             resultproperty="result.real" failonerror="false" fork="true"

         />

         <fail message="Unexpected failure for ${version}: ${result.real}">

             <condition>

                 <not>

                     <equals arg1="${result}" arg2="${result.real}"/>

                 </not>

             </condition>

         </fail>

     </target>

     <target name="-build-one">

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

         <property name="output" value="${version}"/>

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

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

         <javac 

             srcdir="src-${version}" 

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

             source="1.6" target="1.6"

             classpath="${cp}"

             includeantruntime="false"

         />

     </target>

 </project>