thanks Jody for taking the time to respond!
i was indeed thinking of a new function but as a variant to Recode w/
an extra parameter at the end of key-value pairs for the 'default'
case; e.g.
<ogc:Function name="RecodeOrElse">
<ogc:PropertyName>C9</ogc:PropertyName>
<ogc:Literal>4</ogc:Literal>
<ogc:Literal>#FF9900</ogc:Literal>
<ogc:Literal>5</ogc:Literal>
<ogc:Literal>#CC9933</ogc:Literal>
...
<ogc:Literal>10</ogc:Literal>
<ogc:Literal>#FFFF00</ogc:Literal>
<ogc:Literal>#0000FF</ogc:Literal><!-- [1] -->
</ogc:Function>
making this last parameter optional would also mean that the 2
alternatives could be handled by the same named Function logic.
your solution though is more generic and would allow handling other
Functions that behave similarly.
[1] the Literal value to return when get(key) returns null.
On Mon, 9 Apr 2018 17:51:01 -0700, Jody Garnett wrote:
> Sadly the function returns null if the lookup does not have a match,
> see evaluate
> method
> <https://github.com/geotools/geotools/blob/master/modules/library/main/src/main/java/org/geotools/filter/function/RecodeFunction.java#L175>
> .
>
> I think your solution is fine, although it does require a lot of
> duplicate work on your part.
>
> If I was doing this myself I would consider adding a new function that
> returns a nonNull value, or substitutes a fallback value:
>
> CQL: nullFallback( recode( C9, 4, '#FF9900',5, 'CC9933',10,'FFFF00'),
> '#554400')
>
>
> Aside: When implementing Recode we did consider providing a fallback
> value, the Function interface was revised for SE Functions which
> provide a fallback value as part of the function call. It is intended
> to assist with interoperability, when a particular function is not
> available in an execution environment.
>
> GeoTools FunctionFinder provides ability to set fallback
> <http://docs.geotools.org/latest/userguide/library/main/filter.html#functionfinder>
> :
>
> Function function = finder.findFunction( "Recode",
> List<Expression>, fallback );
>
> It was tempting to make Recode return this fallback value if there
> was not a match.
>
> --
> Jody Garnett
>
> On 5 April 2018 at 20:17, Raif S. Naffah <r...@forge.com.au> wrote:
>
> > hi,
> >
> > i'm using the Recode transformation function in SLDs w/ GeoServer
> > 2.8.5 and GeoTools 14.5.
> >
> > i was wondering though what would be the most elegant way for
> > catering for input values _other_ than those specified w/in the
> > parameters of the function?
> >
> > i was able to achieve this by having 2 Rules like so:
> >
> > <?xml version="1.0" encoding="UTF-8"?>
> > <sld:StyledLayerDescriptor xmlns="http://www.opengis.net/sld";
> > xmlns:sld="http://www.opengis.net/sld";
> > xmlns:gml="http://www.opengis.net/gml";
> > xmlns:ogc="http://www.opengis.net/ogc"; version="1.0.0">
> > <sld:NamedLayer>
> > <sld:Name>P2307937L1T2</sld:Name>
> > <sld:UserStyle>
> > <sld:Name>P2307937L1T2</sld:Name>
> > <sld:FeatureTypeStyle>
> > <sld:Name>name</sld:Name>
> > <sld:Rule>
> > <ogc:Filter>
> > <ogc:PropertyIsEqualTo>
> > <ogc:Function name="in">
> > <ogc:PropertyName>C9</ogc:PropertyName>
> > <ogc:Literal>4</ogc:Literal>
> > <ogc:Literal>5</ogc:Literal>
> > ...
> > <ogc:Literal>10</ogc:Literal>
> > </ogc:Function>
> > <ogc:Literal>true</ogc:Literal>
> > </ogc:PropertyIsEqualTo>
> > </ogc:Filter>
> >
> > <sld:PointSymbolizer>
> > <sld:Graphic>
> > <sld:Mark>
> > <sld:WellKnownName>triangle</sld:WellKnownName>
> > <sld:Fill>
> > <sld:CssParameter name="fill">
> > <ogc:Function name="Recode">
> > <ogc:PropertyName>C9</ogc:PropertyName>
> > <ogc:Literal>4</ogc:Literal>
> > <ogc:Literal>#FF9900</ogc:Literal>
> > <ogc:Literal>5</ogc:Literal>
> > <ogc:Literal>#CC9933</ogc:Literal>
> > ...
> > <ogc:Literal>10</ogc:Literal>
> > <ogc:Literal>#FFFF00</ogc:Literal>
> > </ogc:Function>
> > </sld:CssParameter>
> > </sld:Fill>
> > <sld:Stroke>...</sld:Stroke>
> > </sld:Mark>
> > <sld:Size>10.0</sld:Size>
> > </sld:Graphic>
> > </sld:PointSymbolizer>
> > </sld:Rule>
> > <sld:Rule>
> > <ogc:ElseFilter/>
> > <sld:PointSymbolizer>...</sld:PointSymbolizer>
> > </sld:Rule>
> > </sld:FeatureTypeStyle>
> > </sld:UserStyle>
> > </sld:NamedLayer>
> > </sld:StyledLayerDescriptor>
> >
> > is there a better way to do this?
> >
> >
> > TIA + cheers;
> > rsn
> >
> > ------------------------------------------------------------
> > ------------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > _______________________________________________
> > GeoTools-GT2-Users mailing list
> > GeoTools-GT2-Users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
> >
--
cheers;
rsn
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