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From: "Shackelford, John-Mason" <ShacJo@ncs.com>
To: 'Ant Users List' <ant-user@jakarta.apache.org>
Subject: RE: Overload?!
Date: Tue, 17 Sep 2002 09:10:05 -0500
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Christian,

You are on the right track. The only reason you have a problem is that you
include the target twice in build1.xml and build2.xml. 

I use a similar approach to manage build files for a project with multiple
versions. Use one entity (your include.xml) for targets common across
versions and another set of entities for the targets that are version
specific. Then write a build-1.xml and build-2.xml, build-3.xml, etc.for
each version doing two entity includes in each: one for common targets, and
another for version specific targets. You can then launch ant using the
-buildfile option or write your own ant runner to make the switch for you on
the basis of a property file. (I have enclosed an example.) 

John-Mason Shackelford

Software Developer
NCS Pearson - Measurement Services
2510 North Dodge St.
Iowa City, IA 52245
319-354-9200x6214
shacjo@ncs.com



-----Original Message-----
From: Christian Holmqvist, IT, Posten [mailto:christian.holmqvist@posten.se]

Sent: Tuesday, September 17, 2002 4:53 AM
To: 'Ant Users List'
Subject: Overload?!


Hi

My situation is that I have made a include.xml file with a number of targets
that is correct for 95% of our projects. The problem is the last 5%.

So my question is: Is there any way to overload a target with Ant?

This is how I would like it to work:

---- include.xml --------

<target name="compile">
	<echo message="foo"/>
</target>

---- build.xml ----

<!DOCTYPE project [
    <!ENTITY include SYSTEM "file:./include.xml">
]>

<project name="test" default="compile" basedir=".">
	&include;
</project>
<!-- in this file the compile in include.xml will be executed -->

----- build1.xml -----

<!DOCTYPE project [
    <!ENTITY include SYSTEM "file:./include.xml">
]>

<project name="test" default="compile" basedir=".">
	&include;

	<target name="compile">
		<echo message="bar"/>
	</target>
</project>
<!-- in this file the compile in include.xml will be executed -->

------- build2.xml --------------
<!DOCTYPE project [
    <!ENTITY include SYSTEM "file:./include.xml">
]>

<project name="test" default="compile" basedir=".">
	<target name="compile"
		<echo message="bar"/>
	</target>

	&include;
</project>
<!-- in this file the compile in build2.xml will be executed -->
--------------------------------------

When this is done today ant tells med that compile is duplicated (or
something like that).

Is there a way around this??

Thanks for your time!

Cheers Christian


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Content-Type: application/octet-stream;
	name="AntRunner.java"
Content-Transfer-Encoding: quoted-printable
Content-Disposition: attachment;
	filename="AntRunner.java"

package org.shackelford.ant;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;

import org.apache.tools.ant.Main;

/**
 * Executes Ant launching a version specific build.xml
 *=20
 * <p>using the -buildfile option overrides the special functionality =
of this
 * class. If the required property file and key are not located =
somewhere on
 * the classpath, the AntRunner will use the default build.xml =
file.</p>
 *
 * <p>Note that this class needs to be rewritten to support JDK =
1.x.</p>
 *
 * <p>Thanks to <a href=3D"mailto:DDevienne@lgc.com">Dominique =
Devienne</a>
 * for suggesting this approach.</p>
 *
 * @author <a href=3D"mailto:shacjo@ncs.com">John-Mason P. =
Shackelford</a>
 * @version $Revision:   1.0  $, $Date:   Jul 24 2002 12:07:44  $
 */
public class AntRunner {

    public static String PROPERTY_FILE =3D "local.build.properties";
    public static String PROPERTY_FILE_ALTERNATE =3D =
"build.properties";

    public static String PROPERTY_KEY =3D "application.build.version";

    public static void main(String[] args) {

        Date time =3D new Date();
        =
System.out.println("----------------------------------------------------=
---");
        System.out.println("AntRunner        " + time);
        =
System.out.println("----------------------------------------------------=
---\n");

        //        // debugging -- iterate through args
        //        System.out.println("INPUT:");
        //        for (int i =3D 0; i < args.length; i++) {
        //            System.out.println((i + 1) + ". " + args[i]);
        //        }
        //        if (args.length =3D=3D 0) {
        //            System.out.println("No args");
        //        }
        //

        List myArgs =3D new ArrayList();
        boolean isBuildfileSpecified =3D false;
        int buildfileAtElement =3D 0;

        // process the command line arguments to include our special =
version
        // swapping and strip the old AntRunner if it should appear
        for (int i =3D 0; i < args.length; i++) {

            if (!args[i].equals("org.apache.tools.ant.Main")) {

                myArgs.add(args[i]);
            }

            if (args[i].equalsIgnoreCase("-buildfile")) {
                isBuildfileSpecified =3D true;
                buildfileAtElement =3D i + 1;
            }

        }

        // get the build version from a property file
        String version =3D getBuildVersion(PROPERTY_FILE, =
PROPERTY_KEY);

        if (version =3D=3D null || version.length() < 1)
            version =3D getBuildVersion(PROPERTY_FILE_ALTERNATE, =
PROPERTY_KEY);

        // add our own buildfile specification based on our version

        String buildfile =3D null;
        if (!isBuildfileSpecified) {
            if (version =3D=3D null || version.length() < 1) {
                System.out.println("Using default buildfile: =
build.xml.");
            } else {
                buildfile =3D "build-" + version + ".xml";
                System.out.println(
                    "Using buildfile for version " + version + ": " + =
buildfile + ".");
                myArgs.add("-buildfile");
                myArgs.add(buildfile);
            }
        } else {
            System.out.println("Using the specified buildfile: " + =
args[buildfileAtElement] + ".");
        }

        // launch ant
        String[] newArgs =3D (String[]) myArgs.toArray(new String[0]);

        //        // debugging -- iterate through args
        //        for (int i =3D 0; i < newArgs.length; i++) {
        //            System.out.println((i + 1) + ". " + newArgs[i]);
        //        }
        //        if (newArgs.length =3D=3D 0) {
        //            System.out.println("No args");
        //        }
        Main.main(newArgs);
    }

    /**
     * load up the build version from the specified key in the named=20
     * property file located somewhere on the classpath
     * @param file the file name of the property file to load=20
     * (Do not include path information!)
     * @param key the property key to use for the version
     */
    private static String getBuildVersion(String file, String key) {

        // get the property file=20
        System.out.println("Searching the classpath for " + file + =
".");
        ClassLoader classLoader =3D ClassLoader.getSystemClassLoader();
        InputStream stream =3D classLoader.getResourceAsStream(file);

        Properties props =3D null;

        if (stream !=3D null) {
            props =3D new Properties();
            try {
                props.load(stream);
            } catch (IOException ioe) {}
        }

        // if the property file is found and a build version is=20
        // specified, use it to launch the correct build.xml
        // otherwise run ant as usual
        String version =3D null;

        if (props =3D=3D null) {
            System.out.println("The " + file + " file was not found.");
        } else {
            version =3D props.getProperty(key);
            if (version =3D=3D null || version.length() < 1) {
                System.out.println("The " + key + " key was not =
found.");
            } else {
                System.out.println("Running Ant for application version =
" + version + ".");
            }
        }

        return version;
    }
}


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