W dniu 01.10.2015 o 12:04, Andrea Aime pisze:
> On Thu, Oct 1, 2015 at 11:52 AM, Maciej Filocha <m.filo...@icm.edu.pl
> <mailto:m.filo...@icm.edu.pl>> wrote:
>
> Hi,
>
> I'm using windbarbs with following definition:
>
>
> <WellKnownName>windbarbs://default(<ogc:PropertyName>speed</ogc:PropertyName>)[m/s]</WellKnownName>
>
> Everything works as expected except the "Preview legend" command that
> throws an error:
>
> ERROR [wicket.RequestCycle] - The specified mark
> strConcat([strConcat([windbarbs://default(], [speed])], [)[m/s]]) was
> not found!
>
> Any ideas?
>
>
> Simple, in the preview we have no values for the speed attribute, so no
> mark can be generated (there, and in
> GetLegendGraphics). We'd need some way to specify default values, but
> it's not so easy...
> something like "if_the_else(isNull(speed),10,speed)" should do the
> trick, but as OGC expression it's a bit
> long winded... I don't remember if we allow using ${...} expression in
> well known mark, but you can give it a
> try:
>
> <WellKnownName>windbarbs://default(${if_the_else(isNull(speed),10,speed)})[m/s]</WellKnownName>
After changing "if_the_else" to "if_then_else", I got:
2015-10-01 10:17:06,196 ERROR [wicket.RequestCycle] - Filter Function
problem for function strConcat argument #0 - expected type String
java.lang.IllegalArgumentException: Filter Function problem for function
strConcat argument #0 - expected type String
at
org.geotools.filter.function.FilterFunction_strConcat.evaluate(FilterFunction_strConcat.java:52)
at
org.geotools.filter.expression.ExpressionAbstract.evaluate(ExpressionAbstract.java:65)
Anyway, I can live without legend preview...
Maciej
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