[PATCH 18 of 45] (issue1754) Gracefully handle empty differenc results (e.g from km 0, 001 to 0, 002)

[Wald Commits]

# HG changeset patch
# User Andre Heinecke <andre.heinecke at intevation.de>
# Date 1424096859 -3600
# Node ID 0011508d2f9d25aa0a2655ddd460e2ff95cbdf2b
# Parent  04367906f1584d184593f8c112d6a65baec330c0
(issue1754) Gracefully handle empty differenc results (e.g from km 0,001 to 0,002)

diff -r 04367906f158 -r 0011508d2f9d artifacts/src/main/java/org/dive4elements/river/artifacts/model/DifferenceCurveFacet.java
--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/DifferenceCurveFacet.java	Mon Feb 16 12:55:38 2015 +0100
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/DifferenceCurveFacet.java	Mon Feb 16 15:27:39 2015 +0100
@@ -14,6 +14,7 @@
 import org.dive4elements.artifacts.Artifact;
 import org.dive4elements.artifacts.CallContext;
 import org.dive4elements.river.artifacts.WINFOArtifact;
+import org.dive4elements.river.artifacts.model.WKmsImpl;
 import org.dive4elements.river.artifacts.states.DefaultState.ComputeType;
 
 
@@ -54,11 +55,15 @@
 
         WKms [] wkms = (WKms [])res.getData();
 
-        WKms result = wkms[index];
-        log.debug("Got difference curve data (" + result.getName()
-            + ") at index: " + index);
-
-        return result;
+        if (wkms.length > 0) {
+            WKms result = wkms[index];
+            log.debug("Got difference curve data (" + result.getName()
+                + ") at index: " + index);
+            return result;
+        } else {
+            log.debug("Empty difference facet.");
+            return new WKmsImpl();
+        }
     }