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