[DD4hep] DDFilteredView current volume path and its copy numbers

DetectorDescription/DDCMS/interface/DDFilteredView.h

@@ -66,6 +66,13 @@ namespace cms {
     //! The physical volume of the current node
     const PlacedVolume volume() const;
 
+    //! The full path to the current node
+    const std::string path() const;
+
+    //! The list of the volume copy numbers
+    //  along the full path to the current node
+    const std::vector<int> copyNos() const;
+
     //! The absolute translation of the current node
     // Return value is Double_t translation[3] with x, y, z elements.
     const Double_t* trans() const;

DetectorDescription/DDCMS/src/DDFilteredView.cc

@@ -68,6 +68,29 @@ const PlacedVolume DDFilteredView::volume() const {
   return PlacedVolume(node_);
 }
 
+//
+// This should be used for debug purpose only
+//
+const std::string DDFilteredView::path() const {
+  TString fullPath;
+  it_.back().GetPath(fullPath);
+  return std::string(fullPath.Data());
+}
+
+//
+// The vector is filled from bottom up:
+// result[0] contains the current node copy number
+//
+const std::vector<int> DDFilteredView::copyNos() const {
+  std::vector<int> result;
+
+  for (int i = it_.back().GetLevel(); i > 0; --i) {
+    result.emplace_back(it_.back().GetNode(i)->GetNumber());
+  }
+
+  return result;
+}
+
 const Double_t* DDFilteredView::trans() const { return it_.back().GetCurrentMatrix()->GetTranslation(); }
 
 const Translation DDFilteredView::translation() const {

DetectorDescription/DDCMS/test/DDFilteredView.cppunit.cc

@@ -68,6 +68,8 @@ void testDDFilteredView::checkFilteredView() {
   DDFilteredView fview(det.get(), det->description()->worldVolume());
   fview.next(0);
   std::cout << fview.name() << " is a " << cms::dd::name(cms::DDSolidShapeMap, fview.shape()) << "\n";
+  std::cout << "Full path to it is " << fview.path() << "\n";
+  auto copyNos = fview.copyNos();
   if (fview.isA<dd4hep::Box>())
     cout << "It's a Box\n";
   fview.parent();