Filter NPE regression from GeoTools 2.2
---------------------------------------

                 Key: GEOT-3234
                 URL: http://jira.codehaus.org/browse/GEOT-3234
             Project: GeoTools
          Issue Type: Bug
          Components: core filter, core styling
    Affects Versions: 2.6.5
            Reporter: Jody Garnett


One of the joys of getting uDig 1.2 near completion is people updating code 
from GeoTools 2.2 all the way to GeoTools 2.6.

>From email here is a regression in the styling system
{code}
<sld:LineSymbolizer>
   <sld:Stroke>
      <sld:CssParameter name="stroke">
      <ogc:Function name="if_then_else">
        <ogc:Function name="lessThan">
          <ogc:PropertyName>VOLTAGE_ID</ogc:PropertyName>
          <ogc:Literal>3</ogc:Literal>
        </ogc:Function>
        <ogc:Literal>#FFBB55</ogc:Literal>
        <ogc:Function name="if_then_else">
          <ogc:Function name="lessThan">
             <ogc:PropertyName>VOLTAGE_ID</ogc:PropertyName>
             <ogc:Literal>7</ogc:Literal>
          </ogc:Function>
          <ogc:Literal>#F78484</ogc:Literal>
          <ogc:Literal>#5C993C</ogc:Literal>
      </ogc:Function>
     </ogc:Function>
{code}

Producing:
{panel}

java.lang.IllegalArgumentException: Filter Function problem for function 
if_then_else argument #0 - expected type boolean
        at 
org.geotools.filter.function.FilterFunction_if_then_else.evaluate(FilterFunction_if_then_else.java:45)
        at 
org.geotools.filter.expression.ExpressionAbstract.evaluate(ExpressionAbstract.java:63)
        at org.geotools.styling.SLD.color(SLD.java:1312)
        at org.geotools.styling.SLD.color(SLD.java:96)
        at org.geotools.styling.SLD.lineColor(SLD.java:84)
        at org.geotools.styling.SLD.color(SLD.java:188)
        at net.refractions.udig.ui.Drawing.paint(Drawing.java:308)
        at net.refractions.udig.ui.Drawing.drawFeature(Drawing.java:246)
        at net.refractions.udig.ui.Drawing.drawFeature(Drawing.java:223)
        at net.refractions.udig.ui.Drawing.drawDirect(Drawing.java:150)
        at net.refractions.udig.ui.graphics.Glyph$6.getImageData(Glyph.java:363)
{panel}

Thanks to Lukasz for the report.

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