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Written By : Amit
Title :
Ant Interview Questions

Description :
Interview questions on Apache Ant and with answer
More...

Written By : admin
Title :
Extending ANT Task

Description :
Sample code Own Task
More...

Tags/Keywords : Sample-code-Own-Task - Extending-ANT-Task - Apache-ANT Example
Author : admin
Date (Year/Month/Date): 2009-01-25
Extending ANT Task User defined

Please be informed that NONE of the design/code from this
page is claiming to be some sort of best practices and we DO NOT expect
any of our visitor/reader of this page to assume this as some sort of
best practice for any context and should not be using this 
as it is without appropriate evaluation to their, so to say, 
specific programming context.

This page intends only to provide bit and piece of known ways  for
doing some sort of example and may not be fit for any other purpose.


How to use Apache ANT for setting up build process of any project, be it
a Java standalone application or a web based or enterprise J2EE Technology
based application?

There are core and optional Tasks available with Ant to use for some Task
or purpose. So before jumping to the build process, one should chalk down
or find out all the sub tasks of the major task (that is either creating
a JAR or WAR or WAR or RAR file). Like for example, in order to create
a EAR file, I think I should have some of the sub tasks like creating
a WAR file, a JAR file and then package all these in a EAR file.

As Apache ANT is Open Source Framework with a very flexible structure
and has features of accomodating any third party Tasks those adhere to
standard ways of following Ant Task's lifecycle.

One can get many Third Party Ant tasks to suit basic need and operating
environment. Like suppose You want to have some sort of database
operation for logging Audit information into database. So far I remember
or my limited knowledge about Apache ANT, there may not be any task that
is available for doing this type of Task automatically, for a very
specific scenario. In this type of scenario, one can provide own set of
Tasks to do whatever database activity required.

I shall try to demonstrate a simple to use and understand example of
creating a MyTesk class that extends org.apache.tools.ant.Task,
and overrides execute method as follows:

package mytask;

import org.apache.tools.ant.Task;

public class MyText extends Task {
    public void execute() {
    	log("This is my Text execute method");
    }
    public void setMyValue(String value) {
    	log("Value is:"+value);
    }
}


As you can see I have a user defined method as setMyValue, this method
is to be invoked by a ANT task "mytext" with attribute as myValue.

Ant Build file for testing this Task is as follows:

<project name="sample" default="mytext">
	 <taskdef name="mytext" classname="mytask.MyText"/>

	<target name="mytext">
		<mytext myValue="I am okay"/>
	</target>
</project>

Now one question arises, How will Ant knows about this Task, as it is
a user defined task?
So the taskdef tag mentioned in build.xml file after project task,
tells Ant that there exist a task as mytext with class file name
as mytask.MyText and it has to be in CLASSPATH environment variable.

On running Ant with the build file, result is as follows:

Buildfile: build.xml

mytext:
   [mytext] Value is:I am okay
   [mytext] This is my Text execute method

BUILD SUCCESSFUL
Total time: 1 second


As per this output, as it shows, setMyValue is called first and then
execute method is called.


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