Logger.h

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/************************************************************************
* Verve                                                                 *
* Copyright (C) 2004-2006                                               *
* Tyler Streeter  tylerstreeter@gmail.com                               *
* All rights reserved.                                                  *
* Web: http://verve-agents.sourceforge.net                              *
*                                                                       *
* This library is free software; you can redistribute it and/or         *
* modify it under the terms of EITHER:                                  *
*   (1) 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. The text of the GNU Lesser      *
*       General Public License is included with this library in the     *
*       file license-LGPL.txt.                                          *
*   (2) The BSD-style license that is included with this library in     *
*       the file license-BSD.txt.                                       *
*                                                                       *
* 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 files    *
* license-LGPL.txt and license-BSD.txt for more details.                *
************************************************************************/

#ifndef VERVE_LOGGER_H
#define VERVE_LOGGER_H

#include <iomanip>
#include <stdlib.h>
#include <string>
#include <ostream>
#include <iostream>
#include <map>
#include <iosfwd>
#include <stdexcept>

#define VERVE_LOGGER Logger::instance().stream

namespace verve
{
        class Logger
        {
        public:
                static Logger& VERVE_CALL instance()
                {
                        static Logger mSelf;
                        return mSelf;
                }

                void VERVE_CALL setStream(const std::string& name, 
                        std::ostream *stream, const std::string& prefix="", 
                        char mark='\0')
                {
                        Logger::Stream s;
                        s.mark = mark;
                        s.silent = false;
                        s.stream = stream;
                        s.prefix = prefix;
                        mStreams[name] = s;
                }

                std::ostream& VERVE_CALL stream(const std::string& name)
                {
                        Logger::Stream s = mStreams[name];

                        if(s.mark != '\0')
                        {
                                std::cout << s.mark;
                                std::cout.flush();
                        }

                        if (!s.prefix.empty())
                        {
                                *s.stream << s.prefix;
                        }

                        return *(s.stream);
                }

        private:
                Logger()
                {
                        setStream("debug", &std::cout, "[Verve debug] ");
                        setStream("warning", &std::cout, "[Verve warning] ");
                        setStream("error", &std::cout, "[Verve error] ");
                }

                ~Logger()
                {
                }

                struct Stream
                {
                        std::ostream *nullStream;
                        std::ostream *stream;
                        bool silent;
                        char mark;
                        std::string prefix;
                };

                std::map<std::string, Stream> mStreams;
        };
}

#endif

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