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CdbRooObjectTranslatorRT.cc

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// File and Version Information:
//      $Id: CdbRooObjectTranslatorRT.cc,v 1.1 2005/05/03 21:23:49 gapon Exp $

#include "BaBar/BaBar.hh"

#include "CdbRoo/CdbRooObjectTranslatorRT.hh"
#include "CdbRoo/CdbRooObjectR.hh"
#include "CdbRoo/CdbRooObjectConvertor.hh"

#include "CdbBase/CdbObject.hh"
#include "CdbBase/CdbTransaction.hh"

#include "ErrLogger/ErrLog.hh"

#include "TClass.h"

#include <iostream>
using std::endl;

template< class R,
          class T >
std::string 
CdbRooObjectTranslatorRT<R,T>::persistentType2Name( )
{
    const char* fatalStr = "CdbRooObjectTranslatorRT<R,T>::persistentType2Name( ) -- FATAL";

  // Get and verify the 'R' type name

    std::string rTypeName = "";
    {
      // To get types we need a transaction.

        CdbTransaction readOnlyTransaction;

      // ATTENTION: If 'R' is not a valid persistent type then the compilations
      //            will abort below.

        rTypeName = R::Class( )->GetName( );

        if( !R::Class( )->InheritsFrom( CdbRooObjectR::Class( )))
            ErrMsg(fatal) << fatalStr << endl
                          << "    The passed as a parameter of the template type \"" << rTypeName << "\"" << endl
                          << "    doesn't correspond to a persistent class deriving from CdbRooObjectR, which is" << endl
                          << "    the very base class of payload objects of the current persistnet technology." << endmsg;
    }
    return rTypeName;
}

template< class R,
          class T >
CdbRooObjectTranslatorRT<R,T>::CdbRooObjectTranslatorRT( ) :
    CdbObjectTranslatorT<T>( persistentType2Name( ))
{ }

template< class R,
          class T >
CdbStatus
CdbRooObjectTranslatorRT<R,T>::toTransientT( T*&                 theTransientPtr,
                                            const CdbObjectPtr& theObjectPtr ) const
{
    const char* errorStr = "CdbRooObjectTranslatorRT<R,T>::toTransientT( ) -- ERROR";

  // Translate the metadata object pointer into a persistent handle
  // This will also check if the metadata pointer is of the correct technology.

    CdbStatus result = CdbStatus::Error;

    CdbCPtr<R> persObjectPtr;

    if( CdbStatus::Success != ( result = CdbRooObjectConvertor::typeSafeNarrow( persObjectPtr,
                                                                                theObjectPtr ))) {
        ErrMsg(error) << errorStr << endl
                      << "    Failed to obtain a persistent handle out of the passed metadata object." << endl
                      << "        OBJECT ID: " << theObjectPtr->id( ) << endmsg;
        return result;
    }

  // Proceed to a user defined translation method

    return toTransientRT( theTransientPtr,
                          persObjectPtr );
}

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// End Of File //
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