Hi Simone,
I've been trying to use the
org.geotools.coverage.processing.operation.Histogram operation against
the sample geoserver coverages and the only one it works for the DEM.
Problem being an NPE thrown at
java.lang.ClassCastException: [Ljava.lang.Object;
at
org.geotools.coverage.processing.OperationJAI.deriveSampleDimension(OperationJAI.java:781)
at
org.geotools.coverage.processing.OperationJAI.deriveGridCoverage(OperationJAI.java:580)
..
This is due to the coverage not defining any geophysics category and
OperationJAI checking for null category list but not for an empty one.
The following patch seems to solve the problem. Do you think it's
alright? I might be missing something fundamental, as I only tried what
seemed obvious.
Index: src/main/java/org/geotools/coverage/processing/OperationJAI.java
===================================================================
--- src/main/java/org/geotools/coverage/processing/OperationJAI.java
(revision 34115)
+++ src/main/java/org/geotools/coverage/processing/OperationJAI.java
(working copy)
@@ -774,7 +774,7 @@
sampleDim = allBands[allBands.length == 1 ? 0 : numBands];
final List<Category> categories =
sampleDim.getCategories();
// GridSampleDimension may contain no categories
- if (categories == null) {
+ if (categories == null || categories.size() == 0) {
result[numBands] = sampleDim;
continue;
}
Cheers,
Gabriel
--
Gabriel Roldan
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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