Re: [Geotools-gt2-users] GeoTools-SLD issue [SEC=Unclassified]

[Michael B. <mic...@gm...>]

Hi Nenad,

OK, here's where I try to sell you another filter function hack and
see if Miles can trump it with a one liner again :-)

import java.util.HashMap;
import java.util.Map;
import org.geotools.filter.FunctionExpressionImpl;
import org.opengis.feature.simple.SimpleFeature;

public class VarLookupFunction extends FunctionExpressionImpl {

    private static Map<String, Double> table

    public VarLookupFunction(String name) {
        super("VarLookup");
    }

    public static void setLookupValues(Map<String, Double> values) {
        table = new HashMap<String, Double>();
        table.putAll(values);
    }

    @Override
    public int getArgCount() {
        return 1;
    }

    @Override
    public Object evaluate(SimpleFeature feature) {
        String varName = getExpression(0).evaluate(feature, String.class);
        return lookupValues.get(varName);
    }

}


Before rendering, populate the lookup table...

VarLookup.setLookupValues( someHashMapOfValues );

In your SLD file...

<FeatureTypeStyle>
  <Rule>
      <Filter>
          <PropertyIsEqualTo>
             <PropertyName>foo</PropertyName>
             <Function name="VarLookup">
               <Literal>variableName</Literal>
             </Function>
          </PropertyIsEqualTo>
      </Filter>

Warning - I haven't tested this and don't really know anything about SLD.

Michael