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CdbNTuplePrintDefaultConverter.hh

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#ifndef CDB_NTUPLE_PRINT_DEFAULT_CONVERTER_HH
#define CDB_NTUPLE_PRINT_DEFAULT_CONVERTER_HH

// File and Version Information:
//      $Id: CdbNTuplePrintDefaultConverter.hh,v 1.3 2004/08/06 05:54:41 bartoldu Exp $

#include "CdbBase/CdbCommon.hh"

#include "BbrStdUtils/BbrIOStreamUtils.hh"

#include <iostream>
#include <iomanip>

#include <string>

/// The default convertor suitable for most primitive data types of C++
/**
  * This converter policy assumes that a type of elements has the corresponding
  * streaming operator ">>" defined.
  */
template < class T >
struct CdbNTuplePrintDefaultConverter {
    static void convertAndPrint( std::ostream&     theOutputStream,
                                 unsigned int theWidth,
                                 const T&     theValue )
    {
        theOutputStream << std::setw( theWidth ) << theValue;
    }
};

/// The specialized convertor for strings
/**
  * We use this convertor here as the Standard Library's C++ string class
  * does not have a streaming operator defined.
  *
  * NOTE: Strings longer than the specified length would be truncated
  *       at the output and the last symbols would be ".." to indicate
  *       the continuation.
  */
template < >
struct CdbNTuplePrintDefaultConverter< std::string > {
    static void convertAndPrint( std::ostream&           theOutputStream,
                                 unsigned int       theWidth,
                                 const std::string& theValue )
    {
        babar::IOStream::all_format_guard guard( theOutputStream );
        theOutputStream.setf( std::ios::left, std::ios::adjustfield );

        if( theValue.length( ) <= theWidth ) {
            theOutputStream << std::setw( theWidth ) << theValue.c_str( );
        } else {
            theOutputStream << std::setw( theWidth - 2 ) << theValue.substr( 0, theWidth - 2 ).c_str( ) << "..";
        }
    }
};

#endif // CDB_NTUPLE_PRINT_DEFAULT_CONVERTER_HH

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