smear/EventFactory.h

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#ifndef INCLUDE_EICSMEAR_SMEAR_EVENTFACTORY_H_
#define INCLUDE_EICSMEAR_SMEAR_EVENTFACTORY_H_
 
#include <string>
 
#include <TClass.h>
#include <TTree.h>
#include <TBranch.h>
 
#include "eicsmear/erhic/EventFactory.h"
 
namespace Smear {
 
template<typename T>
class EventFactory : public erhic::VirtualEventFactory {
 public:
  typedef T EventType;
  virtual ~EventFactory() { }
 
  virtual T* Create() = 0;
 
  virtual std::string EventName() const {
    return T::Class()->GetName();
  }
 
  virtual TBranch* Branch(TTree& tree, const std::string& name) {
    T* event(NULL);  // Temporary, just to pass to TTree::Branch()
    TBranch* branch = tree.Branch(name.c_str(), EventName().c_str(),
                                  &event, 32000, 99);
    branch->ResetAddress();
    if (event) {
      delete event;
    }  // if
    return branch;
  }
 
  virtual void Fill(TBranch& branch) {
    T* event = Create();
    branch.ResetAddress();
    branch.SetAddress(&event);
    branch.GetTree()->Fill();
    if (event) {
      delete event;
    }  // if
  }
};
 
}  // namespace Smear
 
#endif  // INCLUDE_EICSMEAR_SMEAR_EVENTFACTORY_H_