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Subject: Custom Task with nested Patternset
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Date: Thu, 17 Jan 2002 16:09:39 -0000
Message-ID: <07D05A69A3D0C14FAEA60C3ACE8E5564D46FB1@nike.hir.is>
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Thread-Topic: Custom Task with nested Patternset
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From: =?Windows-1252?Q?Stef=E1n_Freyr_Stef=E1nsson?= <stefan@ru.is>
To: <ant-user@jakarta.apache.org>
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Hello.
=20
I'm wondering if there is any information anywhere about how to program
your own custom tasks.  I'm mostly interested in using a nested
patternset element.
=20
The problem is that I need to extend a task written by someone else.
The task is called <genjar> and it basically is a jar task where you
specify the main class and the task extracts all the dependant classes
and includes them in the generated jar.  In the <genjar> task you can
specify a <resource> tag which lets you include additional resources
that are not java class files (such as images, property files and so
on).  The problem with the <resource> tag is that it doesn't allow me to
specify a <patternset> which would take all the matching files from the
classpath and include them also in the generated JAR file.  To clarify,
let me give an example:
<genjar jarfile=3D"test.jar">
  <resource file=3D"org/apache/xerces/readers/xcatalog.dtd" />





 =20
  <resource>
    <patternset>
      <include name=3D"**/*.gif"/>
      <exclude name=3D"**/*.class"/>

    </patternset>

  </resource>


 =20
  <classpath>
    <pathelement location=3D"lib/xerces.jar"/>
    <pathelement location=3D"lib/a_really_big_jar.jar"/>
  </classpath>
</genjar>
This should extract all .gif files from the JAR files in the classpath=20
and place them in the generated JAR file (test.jar).
The problem is of course that I have no experience in programming Ant=20
tasks and even though I've looked at the code in the <genjar> task I
can't begin to imagine where to start.  So if anybody knows a good=20
"task programming tutorial" or is willing to help me out with this=20
problem I would be most greatful.
Kind regards, Stefan Freyr

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