Re: [Geotools-gt2-users] WAS Implementation

[Chris H. <ch...@op...>]

Quoting Herman Le Roux <whl...@cs...>:

> Hallo,
>
> I am trying to build a web alert service and need a bit of advice.
> The service is based on information retrieved from a feature service.
> To get the features/data I use geotools. I need some advice on how to
> generate the XML responses when using the interface (eg HTTP POST
> requests such as GetCapabilities etc). I think my options are: (1)
> Generate the XML from scratch as pre-programmed text string responses
> (2) Use geotools in some way with the GML plug-in (3) Use GML in some
> way. (4) Use a Java XML reader/writer. I am building the service
> using Java. Any advice would be appreciated.
If you're using geotools to get the data and doing WAS, I'd highly
recommend building on GeoServer - it can serve as a nice framework for
ogc webservices - it gives you access to geotools, servlets, and struts
if you desire.

As for your options, Between 1 and 2 I'd insert use SAX production. 
This is how we do things in GeoServer, and it works pretty well, and is
very fast.  It works better than just writing out strings, since you
don't have to worry about getting the tags wrong, you just have to
remember to close things.  To do this approach you extend
org.geotools.xml.transform.TransformerBase.  You can see a good example
in geoserver, in
org.vfny.geoserver.wms.responses.helpers.WMSCapsTransformer.  Writing a
caps document for WAS modeling after that should be pretty simple.  We
also currently use this method for returning GML in GeoServer.

You also may check out XDO, which is the XML framework that the current
GML code in GeoTools is based on.  GeoServer will likely eventually
move over, but we're not quite there yet.  David should be able to give
you more details, I can't find the homepage for it right now.  This
basically fits into (4), it used to be a part of GeoTools, but it's now
split out into it's own project.

best regards,

Chris


>
> Thanks,
> Herman
>
>
>
..............................................................................................................
>    Herman le Roux   M Eng
>
>    Simulation Architect Lead
>    Systems, Modelling & Simulation
>    Defencetek CSIR
>
>    WHl...@cs...
>    www.csir.co.za
>
>    Tel   : +27 (0)12 841 4867
>    Fax   : +27 (0)12 841 5025 (For Attention WH le Roux)
>    Mail  : Office F104, Bld 44, PO Box 395, Pretoria 0001, South
> Africa
>
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