Main-Class value

[THUFIR HAWAT]

The data:

D:\>type build.xml
<project name="XHTML" default="package">

        <property name="outputDir" value="D:\java\classes\" />
        <property name="sourceDir" value="D:\java\src\atreides\xhtml\" />
        <property name="mainClass" value="HelloWorldSwing" />

        <target name="clean">
                <delete dir="${outputDir}" />
        </target>

        <target name="prepare" depends="clean">
                <mkdir dir="${outputDir}" />
        </target>

        <target name="compile" depends="prepare">
                <javac srcdir="${sourceDir}" destdir="${outputDir}"  />
        </target>

        <target name="manifest" depends="compile">
                <manifest file="${outputDir}/MANIFEST.MF">
                        <attribute name="Main-Class"
                        value="atreides.xhtml.${mainClass}" />
                </manifest>
        </target>

        <target name="package" depends="manifest">
                <jar jarfile="${outputDir}/${mainClass}.jar"
                basedir="${outputDir}"
                manifest="${outputDir}/MANIFEST.MF" />
        </target>
</project>

D:\>type java\src\atreides\xhtml\HelloWorldSwing.java
package atreides.xhtml;
import javax.swing.*;

public class HelloWorldSwing {
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

D:\>type java\classes\MANIFEST.MF
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.2
Created-By: 1.5.0_02-b09 (Sun Microsystems Inc.)
Main-Class: atreides.xhtml.HelloWorldSwing


D:\>



I want a variable with the value of "atreides.xhtml." so that 

        <target name="manifest" depends="compile">
                <manifest file="${outputDir}/MANIFEST.MF">
                        <attribute name="Main-Class"
                        value="atreides.xhtml.${mainClass}" />
                </manifest>
        </target>

can be changed to:

        <target name="manifest" depends="compile">
                <manifest file="${outputDir}/MANIFEST.MF">
                        <attribute name="Main-Class"
                        value="${someVar}${mainClass}" />
                </manifest>
        </target>


does that seem a good, or "standard," technique?


thanks,

Thufir

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