data_reader.hpp

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//
// (c) Copyright 2011 DESY, Eugen Wintersberger <eugen.wintersberger@desy.de>
//
// This file is part of libpniio.
//
// libpniio is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// libpniio is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with libpniio.  If not, see <http://www.gnu.org/licenses/>.
// ===========================================================================
//
// Created on: Apr 23, 2012
//     Author: Eugen Wintersberger <eugen.wintersberger@desy.de>
//
//
#pragma once

#include <memory>
#include <iostream>
#include <fstream>
#include <pni/core/types.hpp>


namespace pni{
namespace io{
        
    class data_reader
    {
        private:
            pni::core::string _fname;           
            bool _is_binary;         
            //the stream is accessed via a unique pointer this allows moveing
            //the stream around while benefiting from all advantages of a smart
            //pointer
            mutable std::unique_ptr<std::ifstream> _istream;  

            std::unique_ptr<std::ifstream> 
                _open_stream(const pni::core::string &fname) const;
        protected:
            std::ifstream &_get_stream() const { return *_istream; } 

            //-----------------------------------------------------------------
            void _set_binary() { _is_binary = true; }

            //=======================Constructors=============================== 
            data_reader();

            //-----------------------------------------------------------------
            explicit data_reader(const pni::core::string &fname,bool binary=false);
           
            //-----------------------------------------------------------------
            data_reader(data_reader &&r);

            //-----------------------------------------------------------------
            data_reader(const data_reader &r) = delete;
            
            //=======================assignment operator=======================
            data_reader &operator=(const data_reader &r) = delete;

            //-----------------------------------------------------------------
            data_reader &operator=(data_reader &&r);
            
            
            
        public:
            //===============constructor and destructors===================
            virtual ~data_reader();

            //====================member methods===========================
            pni::core::string filename() const;

            //-------------------------------------------------------------
            void filename(const pni::core::string &fname);

            //-------------------------------------------------------------
            virtual void close();
            
            //-------------------------------------------------------------
            virtual void open();

    };

//end of namespace
}
}