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Date: Mon, 3 Sep 2007 12:36:19 +0100
From: "Peter Reilly" <peter.kitt.reilly@gmail.com>
To: "Ant Users List" <user@ant.apache.org>
Subject: Re: Accessing build script's prefix-to-namespace uri mappings from a
 task.
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References: <46d6b7bb.0716300a.2482.2089@mx.google.com>
	 <46DBEFCE.7090003@apache.org>

On 9/3/07, Steve Loughran <stevel@apache.org> wrote:
> CJ wrote:
> > Hi,
> >
> > Hopefully someone can help me or point me in the right direction here.
> >
> > I have a custom Ant task which I want to use to invoke another command
> > which isn't known at compilation time. It uses an approach very similar
> > to Ant itself, in that it builds the command from RuntimeConfigurables/
> > UnknownElements. This all works but for running commands which have a
> > prefix (such as my other custom commands).
> >
> > I want to be able to translate the prefix to a namespace uri that I can
> > make the correct UnkownElement.setNamespace( uri ) call.
> >
> > For clarity, this is a simplified form of what I want to do. (I realize
> > the example doesn't make a great deal of practical sense in this form;
> > this is just for illustrative purposes, please humor me :) ).
> >
> > <project name="example"
> >          xmlns:myprefix="http://some.uri"
> >          >
> >     <taskdef resource="some/path/task.properties"
> >              uri="http://some.uri"
> >              classpath="mylib.jar"
> >              />     <!-- Supplying 'mytaskname' and 'taskrunner' -->
> >
> >     <!-- Regular execution; example -->
> >     <myprefix:mytaskname ... />
> >
> >     <!-- Task runner; what I want to do -->
> >     <myprefix:taskrunner>
> >         <atask name="myprefix:mytaskname">
> >             ...
> >         </atask>
> >     </myprefix:taskrunner>
> > </project>
> >
> > Taskrunner is what I'm trying to get working, so it executes the task
> > just as Ant would when parsing the xml form above it. I am parsing the
> > 'myprefix' from the task name (atask's name attribute), but I don't
> > know how to get the namespace 'http://some.uri' programmatically at
> > this point.
> >
>
> There's nothing in ant to do this yet, though you could probably write a
> task (which we would gladly accept, esp if it came with docs and tests :),
>
This is something that needs to be in ant-core. At the moment the prefix
namespace mapping is not retained.
It can be a little complicated,
as UEs can get copied and modified - macrodef for exmple.
Peter.


> --
> Steve Loughran                  http://www.1060.org/blogxter/publish/5
> Author: Ant in Action           http://antbook.org/
>
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