SmartDataLocator.h

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//  ====================================================================
//  SmartDataLocator.h
//  --------------------------------------------------------------------
//
//  Package    : GaudiKernel ( The LHCb Offline System)
//
//  Description: Implementation of a smart pointer class to access
//               easily (and efficiently) data stores.
//
//  Author     : M.Frank
//  ====================================================================
#ifndef GAUDIKERNEL_SMARTDATALOCATOR_H
#define GAUDIKERNEL_SMARTDATALOCATOR_H 1

// Framework include files
#include "GaudiKernel/SmartDataPtr.h"

template <class TYPE>
class SmartDataLocator : public SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>
{
public:
  SmartDataLocator( IDataProviderSvc* pService, const std::string& fullPath )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( pService, 0, fullPath )
  {
  }

  SmartDataLocator( IDataProviderSvc* pService, IRegistry* pDirectory )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( pService, pDirectory, "" )
  {
  }

  SmartDataLocator( IDataProviderSvc* pService, DataObject* pObject, const std::string& path )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( pService, 0, path )
  {
    if ( 0 != pObject ) {
      this->m_pDirectory = pObject->registry();
    }
  }

  SmartDataLocator( SmartDataObjectPtr& refObject, IRegistry* pDirectory )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( refObject.service(), pDirectory, "" )
  {
  }

  SmartDataLocator( SmartDataObjectPtr& refObject, const std::string& path )
      : SmartDataStorePtr<TYPE, SmartDataObjectPtr::ObjectLoader>( refObject.service(), refObject.directory(), path )
  {
  }

  virtual ~SmartDataLocator() {}

  template <class OTHER>
  SmartDataPtr<OTHER>& operator=( OTHER* pObj )
  {
    this->m_pObject = dynamic_cast<TYPE*>( pObj );
    return *this;
  }

  template <class OTHER>
  SmartDataPtr<OTHER>& operator=( const OTHER* pObj )
  {
    this->m_pObject = dynamic_cast<TYPE*>( const_cast<OTHER*>( pObj ) );
    return *this;
  }
};

#endif // GAUDIKERNEL_SMARTDATALOCATOR_H