Hi list,
I have a couple of questions on the subject since I’m not too familiar with that and I’m trying to understand how it works.
I have configured a style with a RasterSymbolizer containing a colorMap.
Then, I have set a static legend for that style, referring to a colormap.png in the GEOSERVER_DATA_DIR/style folder, by configuring the Online Resource field.
Then, I have configured a raster layer, by specifying that style as default style.
However, I have noticed that the rendered legend isn’t the static one but it’s still the one dynamically computed from the style’s colormap.
Is it a bug or is it the expected behaviour?
Taking a look at the code:
https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/legendgraphic/GetLegendGraphicKvpReader.java#L438
It seems like the external legend is only “retrieved” in case the InfoObj is an instance of a LayerInfo. Debugging there, it is a null object so no legend is retrieved.
Should the internal getLegendGraphic also provide the LAYER parameter (since we are in the Publishing tab of a Layer we should know that, right?)?
So, out of curiosity, I have tried passing the LAYER parameter to that getLegendGraphic but I’m still getting the computed legend instead of the static one.
Taking a look at the code, I see this:
This line fill the LegendRequest details
https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/legendgraphic/GetLegendGraphicKvpReader.java#L155
This results into calling this:
https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/legendgraphic/GetLegendGraphicKvpReader.java#L234
which setup a FeatureType here:
https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/legendgraphic/GetLegendGraphicKvpReader.java#L235
Note that this line will set the name of the layer as “GridCoverage”
due to using the FeatureUtilities.wrapGridCoverageReader method.
https://github.com/geotools/geotools/blob/master/modules/library/coverage/src/main/java/org/geotools/resources/coverage/FeatureUtilities.java#L221
Long story short, when trying to get the LegendInfo at this line:
https://github.com/geoserver/geoserver/blob/master/src/wms/src/main/java/org/geoserver/wms/legendgraphic/GetLegendGraphicKvpReader.java#L441
will resolve the LegendInfo object but at line 445 it won’t get the LegendRequest:
since the name of the layer doesn’t match (being set by the wrapper to http://www.opengis.net/gml:GridCoverage.)
So I’m lost 
Does it represents a set of bugs or did I missed something?
Do you have any feedbacks on the topic?
Please, let me know.
Cheers,
Daniele
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