RequestedLocalesFile.h

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#ifndef ZYPP_TARGET_REQUESTEDLOCALESFILE_H
#define ZYPP_TARGET_REQUESTEDLOCALESFILE_H

#include <iosfwd>

#include "zypp/base/PtrTypes.h"

#include "zypp/Pathname.h"
#include "zypp/Locale.h"

namespace zypp
{ 

  namespace target
  { 

    //
    //  CLASS NAME : RequestedLocalesFile
    //
    class RequestedLocalesFile
    {
      friend std::ostream & operator<<( std::ostream & str, const RequestedLocalesFile & obj );

      public:
        RequestedLocalesFile( const Pathname & file_r )
        : _file( file_r )
        {}

        const Pathname & file() const
        { return _file; }

        const LocaleSet & locales() const
        {
          if ( !_localesPtr )
          {
            _localesPtr.reset( new LocaleSet );
            LocaleSet & ls( *_localesPtr );
            load( _file, ls );
          }
          return *_localesPtr;
        }

        void setLocales( const LocaleSet & locales_r )
        {
          if ( !_localesPtr )
            _localesPtr.reset( new LocaleSet );

          if ( differs( *_localesPtr, locales_r ) )
          {
            store( _file, locales_r );
            *_localesPtr = locales_r;
          }
        }

      private:
        bool differs( const LocaleSet & lhs, const LocaleSet & rhs ) const
        {
          if ( lhs.size() != rhs.size() )
            return true;
          for_( it, lhs.begin(), lhs.end() )
          {
            if ( rhs.find( *it ) == rhs.end() )
              return true;
          }
          return false;
        }
        static void load( const Pathname & file_r, LocaleSet & locales_r );
        static void store( const Pathname & file_r, const LocaleSet & locales_r );

      private:
        Pathname                      _file;
        mutable scoped_ptr<LocaleSet> _localesPtr;
    };

    std::ostream & operator<<( std::ostream & str, const RequestedLocalesFile & obj );

  } // namespace target
} // namespace zypp
#endif // ZYPP_TARGET_REQUESTEDLOCALESFILE_H