WIP: add example to test the sim data.

fix.

Analysis/CMakeLists.txt

 
 add_subdirectory(TotalInvMass)
 add_subdirectory(TrackInspect)
+add_subdirectory(DumpEvent)

Analysis/DumpEvent/CMakeLists.txt

 gaudi_add_module(DumpEvent
                  SOURCES src/DumpMCParticleAlg.cpp
+                         src/DumpSimHitAlg.cpp
 		         #src/DumpHitAlg.cpp
 			 src/DumpTrackAlg.cpp
 			 #src/DumpCalorimeterAlg.cpp

Analysis/DumpEvent/src/DumpSimHitAlg.cpp

+/*
+ * Description:
+ *   Dump the simulated information.
+ *
+ * Author:
+ *   Tao Lin <lintao AT ihep.ac.cn>
+ */
+
+#include "k4FWCore/DataHandle.h"
+#include "GaudiKernel/Algorithm.h"
+
+#include "edm4hep/MCParticleCollection.h"
+#include "edm4hep/SimTrackerHitCollection.h"
+#include "edm4hep/SimCalorimeterHitCollection.h"
+#include "edm4hep/CaloHitContributionCollection.h"
+
+#include "GaudiKernel/NTuple.h"
+
+class DumpSimHitAlg: public Algorithm {
+public:
+
+    DumpSimHitAlg(const std::string& name, ISvcLocator* pSvcLocator);
+
+    // Three mandatory member functions of any algorithm
+    StatusCode initialize() override;
+    StatusCode execute() override;
+    StatusCode finalize() override;
+
+private:
+    // - collection MCParticleG4: the simulated particles in Geant4
+    DataHandle<edm4hep::MCParticleCollection> m_mcParCol{"MCParticle", 
+            Gaudi::DataHandle::Reader, this};
+
+    // Dedicated collections for CEPC
+    DataHandle<edm4hep::SimTrackerHitCollection> m_VXDCol{"VXDCollection", 
+            Gaudi::DataHandle::Reader, this};
+
+};
+
+DECLARE_COMPONENT( DumpSimHitAlg )
+
+DumpSimHitAlg::DumpSimHitAlg(const std::string& name, ISvcLocator* pSvcLocator) 
+: Algorithm(name, pSvcLocator) {
+
+}
+
+StatusCode DumpSimHitAlg::initialize() {
+    return StatusCode::SUCCESS;
+}
+
+StatusCode DumpSimHitAlg::execute() {
+    auto mcCol = m_mcParCol.get();
+
+    auto vxdCol = m_VXDCol.get();
+
+    for (auto hit: *vxdCol) {
+
+    }
+
+    return StatusCode::SUCCESS;
+}
+
+StatusCode DumpSimHitAlg::finalize() {
+    return StatusCode::SUCCESS;
+}