Args in goals

[Steve Molloy <sm...@convera.com>]

Hi,

    Does anyone know if there are plans to allow passing arguments when
calling goals? For instance, I have to run the same goal for each item
in a list. It would be nice to be able to pass the item as argument and
get some result back, similar to a jelly invoke call... Something like:

<j:forEach var="curItem" items="${myList}">
    <attainGoal name="myGoal" var="theResult">
        <arg type="java.lang.Object" value="${curItem}"/>
    </attainGoal>
    <echo>Current item: ${theResult}</echo>
</j:forEach>

...

<goal name="myGoal" returns="java.lang.String">
    <param type="java.lang.Object" name="theItem"/>
    <j:invoke on="theItem" method="toString" var="return"/>
</goal>

But more useful. <<smiley-4.png>> .. ;-)

Thanks,
Steve

Re: Args in goals

[Erik Husby <mh...@broad.mit.edu>]

Steve Molloy wrote:

>Hi,
>
>    Does anyone know if there are plans to allow passing arguments when
>calling goals? For instance, I have to run the same goal for each item
>in a list. It would be nice to be able to pass the item as argument and
>get some result back, similar to a jelly invoke call... Something like:
>
><j:forEach var="curItem" items="${myList}">
>    <attainGoal name="myGoal" var="theResult">
>        <arg type="java.lang.Object" value="${curItem}"/>
>    </attainGoal>
>    <echo>Current item: ${theResult}</echo>
></j:forEach>
>
>...
>
><goal name="myGoal" returns="java.lang.String">
>    <param type="java.lang.Object" name="theItem"/>
>    <j:invoke on="theItem" method="toString" var="return"/>
></goal>
>
>But more useful. <<smiley-4.png>> .. ;-)
>
>Thanks,
>Steve
>
>
>  
>
Don't use a goal, create a new tag.
<define:taglib uri="mytags">
    <define:tag name="myOperation">
      <... whatever tasks you need to do...>
    </define:tag>
</define:taglib>

<mytags:myOperation theItem="theItemValue"/>

Parameter passing is unstructured, untyped. In the above, in the 
definition of "myOperation" one would refer to the parameter as a Jelly 
expression, i.e. "${theItem}"

Examine the sources of some of the plugins for more details.

-- 
Erik Husby
Senior Software Engineer
Broad Institute of MIT and Harvard 
Rm. 2192  320 Charles St, Cambridge, MA 02141-2023
mobile: 781.354.6669, office: 617.258.9227, 
email: mhusby@broad.mit.edu  AIM: ErikAtBroad


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