Fixes issue https://sourceforge.net/projects/olap4j/forums/forum/5779…

…88/topic/3416385

When no dimensions are included on a query axis, there was an index out of bounds exception thrown. Now it simply skips the axis. One can still validate his query object with the Query.validate() method prior to execution to detect any potential problems.

git-svn-id: https://olap4j.svn.sourceforge.net/svnroot/olap4j/trunk@280 c6a108a4-781c-0410-a6c6-c2d559e19af0

src/org/olap4j/query/Olap4jNodeConverter.java

@@ -105,11 +105,12 @@ protected static CallNode crossJoin(
  getMemberSet(dim2));
  }
 
- //
- // This method merges the selections into a single
- // MDX axis selection. Right now we do a simple
- // crossjoin
- //
+ /*
+ * This method merges the selections into a single
+ * MDX axis selection. Right now we do a simple
+ * crossjoin.
+ * It might return null if there are no dimensions placed on the axis.
+ */
  private static AxisNode toOlap4j(QueryAxis axis) {
  CallNode callNode = null;
  int numDimensions = axis.getDimensions().size();
@@ -124,6 +125,8 @@ private static AxisNode toOlap4j(QueryAxis axis) {
  }
  }
  callNode = generateListTupleCall(members);
+ } else if (numDimensions == 0) {
+ return null;
  } else if (numDimensions == 1) {
  QueryDimension dimension = axis.getDimensions().get(0);
  List<ParseTreeNode> members = toOlap4j(dimension);
@@ -339,7 +342,10 @@ private static ParseTreeNode toOlap4j(
  private static List<AxisNode> toOlap4j(List<QueryAxis> axes) {
  final ArrayList<AxisNode> axisList = new ArrayList<AxisNode>();
  for (QueryAxis axis : axes) {
- axisList.add(toOlap4j(axis));
+ AxisNode axisNode = toOlap4j(axis);
+ if (axisNode != null) {
+ axisList.add(toOlap4j(axis));
+ }
  }
  return axisList;
  }