Logger.h

//
//  Copyright (C) 2017, Alexander Stukowski and Paul Erhart
//
//  This file is part of atomicrex.
//
//  Atomicrex 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 3 of the License, or
//  (at your option) any later version.
//
//  Atomicrex 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 this program.  If not, see <http://www.gnu.org/licenses/>.
//

#pragma once

#include <sstream>

namespace atomicrex {

enum LoggerVerbosity {
  none,
  minimum,
  medium,
  maximum,
  debug
};

class MsgLogger
{
public:

    MsgLogger(LoggerVerbosity verb) : _enabled(verb <= _globalLoggerVerbosity) {}

    ~MsgLogger() { std::cout << _buffer.str(); }

    template<typename T>
    MsgLogger& operator<<(T const& t) {
        if(_enabled)
            _buffer << t;
        return *this;
    }

    MsgLogger& operator<<( std::ostream&(*f)(std::ostream&) ) {
        if(_enabled)
            _buffer << f;
        return *this;
    }

    bool isEnabled() const { return _enabled; }

    static void setVerbosity(LoggerVerbosity verb) {
        _globalLoggerVerbosity = verb;
    }

private:

    bool _enabled;
    std::ostringstream _buffer;

    // The current verbosity level.
    static LoggerVerbosity _globalLoggerVerbosity;
};


inline std::ostream& separatorLine(std::ostream& stream) {
    return stream << "-------------------------------------------------------" << std::endl;
}

} // End of namespace