PisaHelper.h

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#ifndef __PISAHELPER_H__
#define __PISAHELPER_H__

#include "PHTypedNodeIterator.h"
#include "PHIODataNode.h"
#include "phool.h"
#include <iostream>

class TGeoManager;

class PisaHelper
{
 public:

  static TGeoManager* getGeoManager();

  static PHCompositeNode* getPisaNode(PHCompositeNode* top,
                                      const char* pisanodename = "PISA")
  {
    PHNodeIterator iter(top);
    PHCompositeNode* pisanode = 
      dynamic_cast<PHCompositeNode*>
      (iter.findFirst("PHCompositeNode",pisanodename));
    if (!pisanode)
      {
        std::cerr << PHWHERE << "Cannot find " << pisanodename
                  << " under topnode" 
                  << std::endl;
        return 0;
      }
    return pisanode;
  }

  template <class T>
  static T* getClass(PHCompositeNode* top, const char* name,
                     const char* subtop = "PISA")
  {
    PHCompositeNode* sub = getPisaNode(top,subtop);
    PHTypedNodeIterator<T> iter(sub);
    PHIODataNode<T> *Node = iter.find(name);
    if (Node)
      {
        return dynamic_cast<T*>(Node->getData());
      }
    return 0;
  }
  
};

#endif