Re: Tiles: dynamically adding definitions

[Cedric Dumoulin]

 Hi,

 The doc is temporarily available at
http://www.lifl.fr/~dumoulin/howto/
 It will be added to the official doc asap.
 It is not planned yet to add the feature you describe to Tiles. Such 
future can be implemented and used by extending the current core 
implementation, without changing it. If you use the extension mechanism, 
your implementation should survive any future enhancement of the Tiles core.
 However, if you make such extension, feel free to make it available to 
other users. If this feature is heavily used, we will  add it.

 Cedric 

John Nikolai wrote:

Thanks Cedric, I look forward to seeing the document.

Is this a feature which may be added to Tiles at a future date?
Or is this too specialized?
Thanks again,
 - John
On Thursday, February 27, 2003, at 10:46 AM, Cedric Dumoulin wrote:

 Hi,

 The answer is yes, but it need some coding.

 The default definition factory doesn't provide a well know API to 
add dynamically new definitions.
 What you can do is to implement your own definition factory to 
provide such functionality. You can extends the existing factory and 
add the methods you need.
 You have to know that the "extends" mechanism is resolved statically 
when the config file is loaded. After that, definitions are stored 
resolved. So, you have to resolve yourself your extend. This is 
however simple to do: get the definition referenced by "extend", 
create a new definition initialized with the previously loaded one, 
add your own attributes, store your definition in the factory.
 I have a short document describing how to write a factory. I will 
make it accessible asap.

 Cedric

John Nikolai wrote:

Is it possible to define a few base tiles definitions (loaded using 
TilesPlugin) and, during runtime, read in other definitions which 
extend these base definitions?

Here is an example use:

We have an XML file which defines a web site and used to generate 
the web site navigation. If we add a new page to the site we need to 
update this XML file to update the navigation as well. Can I add a 
tiles definition to this XML file and add that definition into tiles 
for processing?

<nav path="/events" file="events.jsp">
    <leftnav> Events &amp; Activities </leftnav>
    <breadcrumb> Events &amp; Activities </breadcrumb>
    <definition name="events.page" extends="master.page">
        <put name="body" value="/events/events.jsp" />
        ...
    </definition>
</nav>
NOTE: "master.page" is defined in the default definitions loaded at 
startup using TilesPlugin.

Doing it this way when I add a new file I only need to update a 
single XML file as opposed to several.

Thanks for your help!
 - John
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