On Thu, 2005-03-31 at 01:55 +0100, Ross Gardler wrote:
> Thorsten Scherler wrote:
> > I wrote a feeder contract for the view plugin.
> >
> > The feeder plugin provide a way to display feed as xdoc.
> >
>
> </snip>
>
> >
> > WDYT?
> >
> > Please discuss that because we should find a solution that has framework
> > character. IMO the implemented solution can be too inflexible.
>
> Hmmm... my solution seems far too simple and since I have not had the
> time to get into your views work yet I think I must be missing
> something. But here goes anyway...
>
> Use Case
> --------
>
> Create a page like this:
>
> _______________________________________________
> | | | |
> | | | |
> | | | RSS Feed |
> | | | |
> | Menu | | |
> | | -----------------
> | | Content |
> | | |
> | | |
> | | |
> | | |
> | | |
> -----------------------------------------------
>
>
> The Problem
> -----------
>
> How does the view get the RSS content without knowing how to render it
> *and* without having a dependency on the plugin that does the rendering
> (in this case the feeder plugin)
>
> Implementation
> --------------
>
> First let us consider what would happen if we were simply requesting a
> page where the RSS feed was the main content.
>
> Forrest would make a request for rssFeed.xml. This request would be
> examined by each plugin in turn, skipping over ones that do not know how
> to generate an XDoc response for the "rssFeed" document. Eventually we
> come to the feeder plugin, which says "hey, I can deal with this
> request". It reads a file, processes it with some XSL and returns an XDoc.
>
> This Xdoc is then processed by the skinning system. First it turns it
> into XHTML, then it adds the navigation sections and we are done.
>
> OK, so no problem so far.
Hmm, what happens if that is not matching?
> Now we want to embed the nugget of RSS data
> into a separate part of the page, the main content is no longer the RSS
> data.
>
> However, if we look carefully at this we see that it isn't really any
> different at the generation stage, it is only at the skinning stage that
> things need to change.
Maybe I am to focused.
>From the feeder plugin:
<map:match pattern="feeder/*.xml">
<map:generate src="{project:content.xdocs}/{1}.xml"/>
<map:transform src="resources/stylesheets/feedDesc2RSS20.xsl"/>
<map:transform src="resources/stylesheets/rss2document.xsl"/>
<map:serialize type="xml"/>
</map:match>
The generation state needs here a feedDescriptor. This descriptor now
exists *only* in the view. It is NOT in {project:content.xdocs}/{1}.xml!
from the Views plugin:
<!--
Get the nugget (xml) of the requested contract.
This will e.g. produce the feedDescriptor.
-->
<map:match pattern="resolve.nugget.*.*">
<map:generate src="cocoon:/prepare.view.{2}"/>
<map:transform src="resources/stylesheets/nugget.xsl">
<map:parameter value="{1}" name="contract"/>
</map:transform>
<map:serialize type="xml"/>
</map:match>
<!--This will now transform the e.g. feedDescriptor-->
<map:match pattern="get.nugget.*.*">
<map:generate src="cocoon://resolve.nugget.{1}.{2}"/>
<map:transform src="resources/nuggets/{1}.fn"/>
<map:serialize type="xml"/>
</map:match>
What happen here is that I first prepare the generation stage by
extracting the descriptor from the view and then transform this
descriptor. The result will be saved as new forrest:property for the
final skinning page.
> The content to go in the RSS Feed box is still generated by requesting
> "rssFeed.xml",
no, in our case we cannot do it, better said I do not how. ;-) Any idea
how?
> we still get XDoc back. All that needs to change is how
> we skin it.
>
The part with delivering xdocs back is as well different in the view
contract. IMO we should take the change and move to
a subset of XHTML2 for the views and not base it on xdocs.
I guess my definition of view is a wee bit different then yours. For me
a forrest:view is comparable with a view on a table of a db. It is a
subset of data that then get returned. The forrest:views decides which
data are needed. True the last stage is the skinning but that is not the
main focus of views.
salu2
--
thorsten
"Together we stand, divided we fall!"
Hey you (Pink Floyd)
