JXTG: invoke macro by name from expression

[Leszek Gawron]

I would like to add one feature to JXTG that would allow not to promote 
hacks like [1]. Example:

<jx:macro name="fooBar">
  <some>content</some>
</jx:macro>
you can only invoke it by <fooBar/>
If I were able to do <jx:invoke macro="fooBar"/> I would be able to pass 
macro name as a parameter to other macro which allows quite powerful 
data injection technique:

<jx:macro name="superPrettyPrintedTable">
  <jx:parameter name="headerTemplate"/>
  <jx:parameter name="elements"/>
  <jx:parameter name="rowTemplate"/>
  <!-- fancy code with lots of graphics here -->
  <table>
    <tr>
      <jx:invoke macro="${headerTemplate}"/>
    </tr>
    <jx:forEach var="currentElement"
                items="elements"
                varStatus="status">
      <tr>
        <td>${status.index}</td>
        <jx:invoke macro="${rowTemplate}" element="${currentElement}"/>
      </tr>
    </jx:forEach>
  </table>
  <!-- fancy code with lots of graphics there -->
</jx:macro>
then use the macro like this:
<jx:macro name="addressesHeaderTemplate">
  <th>City</th><th>Street</th>
</jx:macro>
<jx:macro name="addressRowTemplate">
  <jx:parameter name="address"/>
  <td>${address.city}</td>
  <td>${address.street}/td>
</jx:macro>
<jx:invoke macro="superPrettyPrintedTable"
           headerTemplate="addressHeaderTemplate"
           elements="${addresses}"
           rowTemplate="addressRowTemplate"/>
WDYT? We could deprecate jx:eval then which is not fully supported as 
additional Map structure has to be used as [1] shows.

It does not seem that much coding is needed. I could also strip all 
inner classes from JXTG at the same time as the first step for JXTG 
refactoring.

[1] http://cocoon.apache.org/2.1/userdocs/flow/jxtemplate.html#eval
--
Leszek Gawron                                      [EMAIL PROTECTED]
Project Manager                                    MobileBox sp. z o.o.
+48 (61) 855 06 67                              http://www.mobilebox.pl
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