// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the Andrey N. Sabelnikov nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER  BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 

#pragma once 

namespace epee
{
  namespace net_utils
  {
    struct i_sub_handler
    {
      virtual ~i_sub_handler(){}

      virtual bool update_in( std::string& piece_of_transfer)=0;
      virtual void stop(std::string& OUT collect_remains)=0;
      virtual bool update_and_stop(std::string& OUT collect_remains, bool& is_changed)
      {
        is_changed = true;
        bool res = this->update_in(collect_remains);
        if(res)
          this->stop(collect_remains);
        return res;
      }
    };


    struct i_target_handler
    {
      virtual ~i_target_handler(){}
      virtual bool handle_target_data( std::string& piece_of_transfer)=0;
    };


    class do_nothing_sub_handler: public i_sub_handler
    {
    public: 
      do_nothing_sub_handler(i_target_handler* powner_filter):m_powner_filter(powner_filter)
      {}
      virtual bool update_in( std::string& piece_of_transfer)
      {
        return m_powner_filter->handle_target_data(piece_of_transfer);
      }
      virtual void stop(std::string& OUT collect_remains)
      {

      }
      i_target_handler* m_powner_filter;
    };
  }
}