public List<SegmentHeader> getSegmentHeaders() {
// Special case 0 and 1 workers, for which the 'union' operation
// is trivial.
switch (workers.size()) {
case 0:
return Collections.emptyList();
case 1:
return workers.get(0).getSegmentHeaders();
default:
final List<SegmentHeader> list = new ArrayList<SegmentHeader>();
final Set<SegmentHeader> set = new HashSet<SegmentHeader>();
for (SegmentCacheWorker worker : workers) {
for (SegmentHeader header : worker.getSegmentHeaders()) {
if (set.add(header)) {
list.add(header);
}
}
}
return list;
}
}
public List<Hierarchy> getHierarchies() {
if (queryAxis.getAxisOrdinal().isFilter()) {
// Slicer contains all dimensions not mentioned on other axes.
// The list contains the default hierarchy of
// each dimension not already in the slicer or in another axes.
Set<Dimension> dimensionSet = new HashSet<Dimension>();
for (CellSetAxisMetaData cellSetAxisMetaData : cellSetMetaData.getAxesMetaData()) {
for (Hierarchy hierarchy : cellSetAxisMetaData.getHierarchies()) {
dimensionSet.add(hierarchy.getDimension());
}
}
List<Hierarchy> hierarchyList = new ArrayList<Hierarchy>();
for (Dimension dimension : cellSetMetaData.getCube().getDimensions()) {
if (dimensionSet.add(dimension)) {
hierarchyList.add(dimension.getDefaultHierarchy());
}
}
// In case a dimension has multiple hierarchies, return the
// declared type of the slicer expression. For example, if the
// WHERE clause contains [Time].[Weekly].[1997].[Week 6], the
// slicer should contain [Time].[Weekly] not the default hierarchy
// [Time].
for (Hierarchy hierarchy : getHierarchiesNonFilter()) {
if (hierarchy.getDimension().getHierarchies().size() == 1) {
continue;
}
for (int i = 0; i < hierarchyList.size(); i++) {
Hierarchy hierarchy1 = hierarchyList.get(i);
if (hierarchy1.getDimension().equals(hierarchy.getDimension())
&& hierarchy1 != hierarchy) {
hierarchyList.set(i, hierarchy);
}
}
}
return hierarchyList;
} else {
return getHierarchiesNonFilter();
}
}