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From Steve Loughran <ste...@apache.org>
Subject Re: Accessing build script's prefix-to-namespace uri mappings from a task.
Date Mon, 03 Sep 2007 11:28:14 GMT
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 :),

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

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