log_stream_concise.cpp

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/*
  CLAW - a C++ Library Absolutely Wonderful
 
  CLAW is a free library without any particular aim but being useful to
  anyone.
 
  Copyright (C) 2005-2011 Julien Jorge
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
  contact: julien.jorge@stuff-o-matic.com
*/
#include <claw/logger/log_stream_concise.hpp>
 
#include <algorithm>

claw::log_stream_concise::log_stream_concise(log_stream* s,
                                             std::size_t max_history_size)
  : m_stream(s)
  , m_max_history_size(max_history_size)
{}

claw::log_stream_concise::~log_stream_concise()
{
  delete m_stream;
}

void claw::log_stream_concise::write(const std::string& str)
{
  std::string::size_type p = str.find_first_of('\n');
 
  if(p == std::string::npos)
    m_current_line += str;
  else
    {
      ++p; // includes the '\n'
      m_current_line += str.substr(0, p);
 
      output_current_line();
 
      if(p != str.length())
        write(str.substr(p));
    }
}

void claw::log_stream_concise::flush()
{
  m_stream->flush();
}

void claw::log_stream_concise::output_current_line()
{
  if(std::find(m_previous_lines.begin(), m_previous_lines.end(),
               m_current_line)
     == m_previous_lines.end())
    {
      m_previous_lines.push_back(m_current_line);
      m_stream->write(m_current_line);
 
      if(m_previous_lines.size() > m_max_history_size)
        m_previous_lines.pop_front();
    }
 
  m_current_line.clear();
}