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Date: Fri, 9 Feb 2007 19:36:45 +0100
From: Tobia Conforto <tobia.conforto@linux.it>
To: users@cocoon.apache.org
Subject: Re: aggregating duplicate parameters at sitemap level
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ron.vandenbranden@kantl.be wrote:
> When the XQuery generator is called for in a <map:part>, it is
> impossible to pass the request parameters:
> 
>      <map:aggregate element="root">
>        <!-- get XML representation of request -->
>        <map:part src="cocoon:/requestAsXML"/>
>        <!-- get XQuery result -->
>        <map:part src="cocoon:/{1}.xq"/>
>      </map:aggregate>
> 
> (with a separate match for the .xq part in the pipeline:)
> 
>      <map:match pattern="*.xq">
>        <map:generate src="xquery/simpleSearch.xq" type="xquery">
>           <map:parameter name="use-request-parameters" value="true"/>
>        </map:generate>
>        <map:serialize type="xml"/>
>      </map:match>

I would store the request *parameters* you need in request *attributes*.

Pipeline, part 1:

    <act type="set-request-attr">
      <parameter name="foo" value="{request-param:foo}"/>
      <parameter name="bar" value="{request-param:bar}"/>

      <map:aggregate element="root">
        <!-- get XML representation of request -->
        <map:part src="cocoon:/requestAsXML"/>
        <!-- get XQuery result -->
        <map:part src="cocoon:/{../1}.xq"/>
      </map:aggregate>
    </act>

(Don't forget that {1} becomes {../1}.)

Part 2:

    <map:match pattern="*.xq">
      <map:generate src="xquery/simpleSearch.xq" type="xquery">
         <map:parameter name="foo" value="{request-attr:foo}"/>
         <map:parameter name="bar" value="{request-attr:bar}"/>
      </map:generate>
      <map:serialize type="xml"/>
    </map:match>

This has the added benefit of avoiding use-request-parameters, which is
generally frowned upon for various reasons.

You will need this component:

    <action name="set-request-attr"
            src="org.apache.cocoon.acting.PropagatorAction">
      <output-module name="request-attr"/>
      <store-empty-parameters>false</store-empty-parameters>
    </action>

(store-empty-parameters is a matter of preference.)

And this change in cocoon.xconf (adding an empty key-prefix option to
the request-attr *output* module):

    <output-modules>
-     <component-instance ... name="request-attr"/>
+     <component-instance ... name="request-attr">
+       <key-prefix/>
+     </component-instance>
    ...
    </output-modules>

Take it all with a grain of salt, I am not a Cocoon expert :-)


Tobia

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