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--- a/metric-providers/org.ossmeter.metricprovider.trans.rascal.CC/src/WMC.rsc
+++ b/metric-providers/org.ossmeter.metricprovider.trans.rascal.CC/src/WMC.rsc
@@ -12,7 +12,6 @@
 import analysis::statistics::Frequency;
 import analysis::statistics::Inference;
 
-import org::ossmeter::metricprovider::Manager;
 import org::ossmeter::metricprovider::ProjectDelta;
 
 
@@ -22,7 +21,7 @@
 @appliesTo{java()}
 map[loc class, num wmcCount] getWMC(
 	ProjectDelta delta = ProjectDelta::\empty(),
-	map[str, loc] workingCopyFolders = (),
+	map[loc, loc] workingCopyFolders = (),
 	rel[Language, loc, M3] m3s = {},
 	rel[Language, loc, AST] asts = {})
 {
@@ -42,7 +41,7 @@
 @appliesTo{java()}
 map[loc method, int cc] getCC(
 	ProjectDelta delta = ProjectDelta::\empty(),
-	map[str, loc] workingCopyFolders = (),
+	map[loc, loc] workingCopyFolders = (),
 	rel[Language, loc, M3] m3s = {},
 	rel[Language, loc, AST] asts = {})
 {
@@ -87,13 +86,13 @@
   return count;
 }
 
-@metric{ccovermethods}
+//@metric{ccovermethods}
 @doc{Calculates the gini coefficient of cc over methods}
 @friendlyName{ccovermethods}
 @appliesTo{java()}
 real giniCCOverMethods(
 	ProjectDelta delta = ProjectDelta::\empty(),
-	map[str, loc] workingCopyFolders = (),
+	map[loc, loc] workingCopyFolders = (),
 	rel[Language, loc, M3] m3s = {},
 	rel[Language, loc, AST] asts = {})
 {
@@ -101,5 +100,9 @@
   
   distCCOverMethods = distribution(ccMap);
   
+  if (size(distCCOverMethods) < 2) {
+    return -1.0;
+  }
+  
   return gini([<0,0>]+[<x, distCCOverMethods[x]> | x <- distCCOverMethods]);
 }