MetaHandleKey.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef STOREGATE_METAHANDLEKEY_H
#define STOREGATE_METAHANDLEKEY_H
 
#include "AthenaKernel/MetaCont.h"
#include "StoreGate/VarHandleKey.h"
#include "StoreGate/StoreGateSvc.h"
#include "CxxUtils/checker_macros.h"
#include "GaudiKernel/ServiceHandle.h"
#include "GaudiKernel/MsgStream.h"
#include "GaudiKernel/IClassIDSvc.h"
 
namespace SG {
 
  template <class T>
  class MetaHandleKey : public VarHandleKey {
 
  public:
    MetaHandleKey( const std::string& key,
                   const std::string& dbKey,
                   Gaudi::DataHandle::Mode a );
 
    StatusCode initialize();
 
    const MetaContBase::SourceID& dbKey() const { return m_dbKey; }
    void setDbKey(const MetaContBase::SourceID& dbKey) { m_dbKey = dbKey; }
 
  protected:
    bool isInit() const { return m_isInit; }
 
    // Deliberately returning a non-const pointer here from a const
    // member function.  We don't own the MetaCont, we just reference it.
    // The Handle<> classes need to get a non-const MetaCont from a
    // const HandleKey<>.
    MetaCont<T>* getContainer ATLAS_NOT_CONST_THREAD_SAFE () const { return m_cont; }
 
    const StoreGateSvc* getStore() const;
 
  private:
 
    ServiceHandle<StoreGateSvc> m_store;
    MetaCont<T>* m_cont{nullptr};
 
    MetaContBase::SourceID m_dbKey{""};
 
    bool m_isInit {false};
 
  };
 
 
}
 
#include "StoreGate/MetaHandleKey.icc"
 
#endif