Build J2ME app using Gant

These days I spent some time learning Groovy. Why I learn Groovy? Because I want to use Gant.  Gant = Groovy + Ant. Gant is really powerful, since you can use Groovy script and Ant API to write your build script instead of XML. I struggle a long time in Ant, because I have to use Ant-Contrib plugin, and it is so hard to write an condition block and even for loop,  it is much easier to do that in Gant script.

Now I am going to share the gant script of building J2ME app, this is just basic, but you can see the power of Gant.

Requirement:
1. You need to install Groovy and Gant, here is the link, I used 1.9.3 in Mac.
2. download the latest version of antenna, here is the download link,  I used 1.2.1-beta.
3. install the JavaME SDK,  I choose  JavaME SDK 3, since it works on Mac.

The J2ME MIDlet class source code:

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
public class HelloWorld extends MIDlet implements CommandListener {
    private final Command exitCommand;
    private final Form form;
 
    public HelloWorld() {
        exitCommand = new Command("Exit", Command.EXIT, 1);
        form = new Form("Hello World!");
        form.append("from Steve");
        form.addCommand(exitCommand);
        form.setCommandListener(this);
    }
 
    protected void startApp() {
        Display.getDisplay(this).setCurrent(form);
    }
 
    protected void pauseApp() {}
    protected void destroyApp(boolean force) {}
 
    public void commandAction(Command cmd, Displayable disp) {
        if (cmd == exitCommand) {
            destroyApp(false);
            notifyDestroyed();
        }
    }
}

The Ant script looks like:

<project name="antenna-test" default="jar" basedir=".">
 
 <taskdef resource="antenna.properties" classpath="./antenna-bin-1.2.1-beta.jar" />
 
 <property name="wtk.home" value="/Users/Steve/dev/wtk252" />
 <property name="wtk.midp.version" value="2.0" />
 <property name="wtk.cldc.version" value="1.1" />
 
 <property name="src.dir" location="src" />
 <property name="out.dir" location="out" />
 <property name="dist.dir" location="dist" />
 <property name="preverified.dir" location="preverified" />
  
 <!-- Regular targets -->
 <target name="clean" description="cleans the target directory">
  <delete dir="${out.dir}"/>
  <delete dir="${dist.dir}"/>
  <delete dir="${preverified.dir}"/>
 </target>
 
 <target name="compile" depends="init">
  <wtkbuild source="1.3" srcdir="${src.dir}" destdir="${out.dir}">
  </wtkbuild>
 </target>
 
 
 <target name="preverify" depends="compile">
  <wtkpreverify srcdir="${out.dir}" destdir="${preverified.dir}">
  </wtkpreverify>
 </target>
 
 <target name="jar" depends="compile,jad,preverify">
  <wtkpackage jarfile="${dist.dir}/helloworld.jar"
                      jadfile="${dist.dir}/helloworld.jad"
                      obfuscate="false"
                      preverify="false">

       <fileset dir="${out.dir}"/>
        </wtkpackage>
   
 </target>
 
 <target name="jad" depends="compile">
  <wtkjad  version="0.01" name="hello" vendor="foo" jadfile="${dist.dir}/helloworld.jad" jarfile="${dist.dir}/helloworld.jar">
    <midlet name="hello" class="HelloWorld">
    </midlet> 
  </wtkjad>
 </target> 
 <target name="init" description="initialization for properties and paths" depends="clean">
  <buildnumber/>
  <mkdir dir="${out.dir}"/>
  <mkdir dir="${dist.dir}"/>
  <mkdir dir="${preverified.dir}" />
 </target>
 
 
</project>

the build script build.gant:

ant.taskdef(resource:"antenna.properties", classpath:"./antenna-bin-1.2.1-beta.jar")

ant.property(name:"wtk.home", value:"/Applications/Java_ME_SDK_3.0.app/Contents/Resources")
ant.property(name:"wtk.midp.version", value:"2.0")
ant.property(name:"wtk.cldc.version", value:"1.1")

final srcDir = "src"
final outDir = 'out'
final distDir = 'dist'
final preverifiedDir = 'preverified'

//clean target
includeTargets << gant.targets.Clean
cleanPattern << '**/*~'
cleanDirectory << [ outDir, distDir, preverifiedDir]


target(name:"init", description:"initialization") {
 depends(clean)
 /*buildnumber() */
 mkdir(dir:outDir)
 mkdir(dir:distDir)
 mkdir(dir:preverifiedDir)
}

target(name:"compile", description:"compile") {
 depends(init)
 wtkbuild( source:"1.3", srcdir:srcDir, destdir:outDir)
}

target(name:"preverify", description:"preverify") {
 depends(compile)
 wtkpreverify(srcdir:outDir, destdir:preverifiedDir)
}

//target jad file

target(name:"jad", description:"generate jad file") {
    depends(compile)
 wtkjad( version:"0.01", name:'hello', vendor:"foo", jadfile:"${distDir}/helloworld.jad", jarfile:"${distDir}/helloworld.jar" ) {
  midlet(name:"hello", class:"HelloWorld")
 }
}

//target jar
target(name:"jar", description:"generating jar file") {
 depends(compile,jad)
 wtkpackage( jadfile:"${distDir}/helloworld.jad", jarfile:"${distDir}/helloworld.jar", obfuscate:"false", preverify:"false")  {
  fileset(dir:outDir)
 }
}

//target obfuscate

//target all
target(name:"all", description: "build the whole app") {
 depends(jar)
}

setDefaultTarget(all)

From the above script, you can see how easy to write gant build script.
This is only the basic implementation, I am going to post more Gant based script in future.

In future I am going to consider:
1. How to integrate with ANT script;
2. How import multiple Gant script file.