I am noob so bear with me. I am creating a build.xml file and in it I have a target that initializes the environment. Before ant runs it searches a directory called source to see if a certain file type is available(via a condition). If the condition fails a message appears. I need help looking for certain files vs hard coding each filename that is suppose to appear in the directory. See below.

<?xml version="1.0" ?>
<project default="main">
   <property name="message" value="Building the .jar file."/>
   <property name="src" location="source"/>
   <property name="output" location="bin"/>

   <target name="main" depends="init,compile, compress" description="Main Target">
      <echo>
          ${message}
      </echo>
   </target>
<target name="init" description="Initalize Environment Target">
      <mkdir dir="${output}"/>
      <condition property="check.source">
      <and>
         <available file="${src}/*.java"/>
      </and>
      </condition>
      <fail message="No source files located in source directory." unless="check.source" />