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Staff
Posts: 99
Registered: ‎07-07-2016

Example of WMS Façade for changing content of capabilties

[ Edited ]

We need to change capabilities service of a WMS in order to provide a legend graphic representation of a gorup layer.

Is there any example on how to do it with WMS Façade.?  Customer has Geospatial SDI product adquired.

 

Technical Evangelist
Posts: 1,118
Registered: ‎09-11-2015

Re: Example of WMS Façade for changing content of capabilties

Hi Josep,

By using the custom pipe DLL implementation, you can modify the Capabilities XML during runtime. Sample:

[SDIMethodHandler("GetCapabilities", "1.1.1", "wms")]
[SDIMethodHandler("GetCapabilities", "1.3.0", "wms")]
public IResponseBase GetCapabilitiesHandler(SDIMethodParameters parameters,
                               AdditionalParametersCollection additionalParameters,
                               IUserContext userContext)
{
   var response = InvokeOnNextPipe(parameters, additionalParameters, userContext);
   response = ProcessResponse(response);
   return response;
}

bool ShouldChangeLegendUrl(XElement legendURL)
{
   // determine if this is the legendurl to change
   // choose your own determining logic
   return true;
}

IResponseBase ProcessResponse(IResponseBase response)
{
   var xdoc = XDocument.Load(response.ResponseStream);
   foreach (var legendURL in xdoc.Descendants().Where(x => x.Name.LocalName == "LegendURL"))
   {
       if (ShouldChangeLegendUrl(legendURL))
       {
           legendURL.Descendants().Where(x => x.Name.LocalName == "OnlineResource").Attributes().First(x => x.Name.LocalName == "href").Value = "whatever";
       }
   }
   var resultResponse = new XMLResponse(xdoc, response.MimeType);
   resultResponse.Headers.Add(response.Headers);
   resultResponse.HttpCode = response.HttpCode;
   return resultResponse;
}
Jan Neumann
Post Sales Engineer Web Applications
Hexagon Geospatial

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