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Date: Thu, 09 Jun 2005 10:23:20 +0100
From: Peter Reilly <peterreilly@apache.org>
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To: Ant Users List <user@ant.apache.org>
Subject: Re: type not supported by task?
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I meant to reply yesterday - but my battery ran out.
You need to use the attribute "loaderref" so that the
same classloader is used for both the typedef and the
taskdef. Otherwise, different classloaders will be used,
and so the the classes will not be compatible.

Example:
--------------------- build.xml ---------------
<project>
  <target name="compile">
    <mkdir dir="classes"/>
    <javac srcdir="src" destdir="classes"/>
  </target>

  <target name="works" depends="compile">
    <taskdef name="task" classname="my.Task"
             classpath="classes" loaderref="my.loaderref"/>
    <typedef name="type" classname="my.Type"
             loaderref="my.loaderref"/>
    <task>
      <type/>
    </task>
  </target>

  <target name="fails" depends="compile">
    <taskdef name="task" classname="my.Task"
             classpath="classes" />
    <typedef name="type" classname="my.Type"
             classpath="classes"/>
    <task>
      <type/>
    </task>
  </target>

</project>

-------------- Task.java ------------------

package my;

public class Task extends org.apache.tools.ant.Task {
    public void add(Type p) {
    }
}

---------------  Type.java --------------------

package my;

public class Type {
}

Peter

Eric Tchepannou wrote:

>I have checked http://www.oracle.com/technology/pub/articles/bodewig_taskwriters.html
>I think I should rather use addMyBaseType(MyBaseType t) instead of
>addConfigured(...) ?
>Could it be that this new syntax is now only valid with Ant 1.6 + ?
>
>On 6/9/05, Eric Tchepannou <mellists@gmail.com> wrote:
>  
>
>>Thanks for that Matt.
>>I have checked my code again and managed to have it working with the
>>createXXX() Method. The addConfigured(..) still fails... :(
>>
>>On 6/8/05, Matt Benson <gudnabrsam@yahoo.com> wrote:
>>    
>>
>>>Eric:
>>>  Without consulting the code (much)... if you want
>>>your custom task to recognize any of
>>>
>>><mytask>
>>>  <mytypea />
>>></mytask>
>>>
>>><mytask>
>>>  <mytypeb />
>>></mytask>
>>>
>>><mytask>
>>>  <mytypec />
>>></mytask>
>>>
>>>where mytypea|b|c all have one base class, you will
>>>want to make each type available with a typedef and
>>>then the code you have--addConfigured(BaseTypeClass
>>>o)--should work. Beyond that I do wonder why you need
>>>to cast your subtypes... OO would dictate that you
>>>call  a designated method and they would simply behave
>>>accordingly, but whatever floats your boat I suppose.
>>>
>>>HTH,
>>>Matt
>>>
>>>--- Eric Tchepannou <mellists@gmail.com> wrote:
>>>
>>>      
>>>
>>>>Hello,
>>>>
>>>>I am developing an ant task extension but face
>>>>problems to have it
>>>>running from the buildfile. I get an error stating
>>>>that a certain
>>>>custom type of mine is not supported by my task.
>>>>
>>>>I think I know where the problem might come from:
>>>>I have implemented multiple types that I have
>>>>defined as extension of
>>>>a base abstract class (that implements an interface)
>>>>and in my Task
>>>>extension I have defined an
>>>>addConfigured(BaseTypeClass o) and do the
>>>>casting in the method implementation.
>>>>Could this be the source of the problem?
>>>>Should I rather for each type subclass implement a
>>>>addConfigured(TypeSubclass o)?
>>>>
>>>>...or do you think the the problem somewhere else?
>>>>
>>>>My next step will be to test this, but as this might
>>>>be a time
>>>>consuming typing job, I thought I could count on
>>>>your previous
>>>>experiences.
>>>>
>>>>Many thanks for your contributions.
>>>>
>>>>--
>>>>Best Regards,
>>>>Eric Tchepannou
>>>>
>>>>
>>>>        
>>>>
>>>---------------------------------------------------------------------
>>>      
>>>
>>>>To unsubscribe, e-mail:
>>>>user-unsubscribe@ant.apache.org
>>>>For additional commands, e-mail:
>>>>user-help@ant.apache.org
>>>>
>>>>
>>>>        
>>>>
>>>
>>>
>>>__________________________________
>>>Discover Yahoo!
>>>Use Yahoo! to plan a weekend, have fun online and more. Check it out!
>>>http://discover.yahoo.com/
>>>
>>>      
>>>
>>--
>>Best Regards,
>>Eric Tchepannou
>>
>>    
>>
>
>
>  
>


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