VP1SGAccessHelper.h

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/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
*/
 
 
//                                                            //
//  Header file for class VP1SGAccessHelper                   //
//                                                            //
//  Description: Helper class for safe StoreGate retrieval    //
//                                                            //
//  Author: Thomas H. Kittelmann (Thomas.Kittelmann@cern.ch)  //
//  Initial version: March 2008                               //
//                                                            //
 
#ifndef VP1SGACCESSHELPER_H
#define VP1SGACCESSHELPER_H
 
#include "VP1Base/VP1HelperClassBase.h"
#include "StoreGate/StoreGateSvc.h"
#include <stdexcept>
class VP1SGContentsHelper;
 
class VP1SGAccessHelper : public VP1HelperClassBase {
public:
 
  VP1SGAccessHelper( IVP1System *, const bool detStore = false );//For messages in gui (detStore=true takes detector rather than event store)
  VP1SGAccessHelper( StoreGateSvc * );
  virtual ~VP1SGAccessHelper();
 
  //Retrieve objects by type and key:
  template <typename T>
  bool retrieve( const T* &, const QString& key ) const;//returns false and sets to null pointer in case of errors
 
  template <typename T>
  const T* retrieve( const QString& key ) const;//returns a null pointer in case of errors
 
 
  // Retrieve all objects of type T
  template <typename T>
  bool retrieve(SG::ConstIterator<T>& begin, SG::ConstIterator<T>& end, bool silent = false );//Returns false in case of errors.
  //silent = true means all output will be redirected to verbose level
  //  -> NB: This DataHandle retrieval is something we should avoid in VP1!!!
  //  -> If you absolutely need to use it (due to bad implementations
  //  -> in upstream data providers), please use VP1SGContentsHelper
  //  -> to check that there is not more than one collection of the
  //  -> type you re trying to retrieve. If there is, abort!
 
private:
 
  VP1SGAccessHelper( const VP1SGAccessHelper & );
  VP1SGAccessHelper & operator= ( const VP1SGAccessHelper & );
 
  class Imp;
  Imp * m_d;
 
  StoreGateSvc * storeGate() const;
  bool contains(const CLID& id, const QString&) const;
};
 
#include "VP1Utils/VP1SGAccessHelper.icc"
 
#endif