[mapserver-users] SLD with Mapserver 5.4.2

[Andrea Dessì]

Michael Schulz ha scritto:
> Hi Andrea,
>
> mapserver uses sld in "library" mode, meaning that if for a certain
> layer of the mapfile an sld symbolization is provided it takes
> precedence over the mapfile symbolization. If for another layer no sld
> id provided, then the mapfile symbolization is used. Thus, As far as I
> know you can only "replace" the symbolization of a complete layer and
> not add styling in a sense of taking the labelling definitions from
> the mapfile and the fill-color from the sld for one layer.
>   
Yes, it's working now ;)
> It may nevertheless be that some definitions regarding symbolization
> are mixed, e.g. the transparency settings of a layer is kept when
> applying an sld (at least this was the case for older versions).
>
> When you really want to add something to the symbolization, a possible
> approach would be to use the getstyle request to obtain mapserver's
> sld-representation of the current layer styling, then you could add or
> modify that and sent it back modified for a getmap request.
>   
Michael, using java, we get the layer's style from the request.
Before doing the new request to WMS server, we tried to extract the
old style and then add a new style (in the new request there are  the 
old and the  new ones)

So using geotools we have:

    [...]
      StyleImpl styleImpl = new StyleImpl(); // istantiate new Style
      List<FeatureTypeStyle> featuresStyles = new
    ArrayList<FeatureTypeStyle>(); //define list of styles
      featuresStyles.add(featureTypeStyle); // defining style list
      styleImpl.setFeatureStyles(featuresStyles);   // applying feature
    styles to the current style
     
      List<StyleImpl> st = new ArrayList<StyleImpl>(); // the new style list
      st.add(style); // adding the old style coming from the request
      st.add(styleImpl); // adding our new style
      
      // then defining the new request with layer...
      Layer l = new Layer(); 
      l.setStyles(st);
      l.setName("nycroads");
      request.addLayer(l);

    [...]

So we are trying to:
 - ask getCapabilites to WMS  server
 - retrieving the style list from the layer
 - retrieve the old style from the layer
 - create a new style for the layer
 - insert one old style and a new one to the layer
 - do a request with the elaborated layer

result: not working :)

is it a good approach?

Thank you,
Andrea


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