Antwort: [udig-devel] How to add a filter to a SLD rule?

[Jesse Eichar]

Ack,  I had a response partially written for you but forgot to finish  
it.  Sorry about that.  If you could do me a favour.  I'd appreciate  
a little code snippet for this that I can put in our code snippets  
directory.  You can see the existing code snippets at:

http://svn.geotools.org/udig/branches/1.1.x/udig/tutorials/ 
net.refractions.udig.code.examples/src/net/refractions/udig/code/ 
examples/

Jesse

On 6-Mar-07, at 12:36 AM, tony.roth at GMX.de wrote:

> I found some useful hints on
> http://docs.codehaus.org/display/GEOTOOLS/Expressions and http:// 
> docs.codehaus.org/display/GEOTOOLS/Upgrade+to+2.4.
>
> sorry, next time I will first check the documentation :)
>
> tony roth
>
> Hi list,
> I have a layer (geo resource based on a shape file) with point  
> elements and I want them symbolized by different symbols. The  
> grouping is based on an attribute (given by the db file). I have  
> read how it looks like in the SLD xml with the ogc:filter elements  
> and its children but I have no idea how to realize the right filter  
> for <ogc: PropertyIsEqualTo>
> I guess I have to do this: For every group I generate the  
> org.geotools.styling.Rule with PointSymbolizer and perhaps  
> TextSymbolizer and then I have to add a filter with rule.setFilter 
> (Filter filter). The Filter I have to generate with  
> FilterFactoryFinder.createFilterFactory().create... but which kind  
> of filter? Is it an attributeExpression (since I want to filter one  
> of the attributes) or a Logic Filter?
> Finally I have one rule for each value and then I generate the  
> FeatureTypeStyle based on these rules.
> I need help with the filter. The attribute is called "objecttype"  
> and the attribute values are characters.
> Thank you!
> tony roth
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