Log.h

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * This program 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.
 *
 * This program 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/>.
 */
 
#ifndef __LIB_LIBSTD_LOG_H
#define __LIB_LIBSTD_LOG_H
 
#include "Singleton.h"
#include "Macros.h"
 
#define MAKE_LOG(type, typestr, msg) \
    {\
     if (Log::instance() && type <= Log::instance()->getMinimumLogLevel())  \
        (*Log::instance()) << "[" typestr "] " << __FILE__ ":" <<  __LINE__ << " " << __FUNCTION__ << " -- " << msg << "\r\n"; \
    }
 
#define FATAL(msg) \
    { \
        MAKE_LOG(Log::Emergency, "Emergency", msg); \
        if (Log::instance()) Log::instance()->terminate(); \
    }
 
#define ERROR(msg)   MAKE_LOG(Log::Error, "Error", msg)
 
#define WARNING(msg) MAKE_LOG(Log::Warning, "Warning", msg)
 
#define NOTICE(msg)  MAKE_LOG(Log::Notice, "Notice", msg)
 
#define INFO(msg)    MAKE_LOG(Log::Info, "Info", msg)
 
#define DEBUG(msg)   MAKE_LOG(Log::Debug, "Debug", msg)
 
class Log : public WeakSingleton<Log>
{
  private:
 
    static const Size LogBufferSize = 512;
 
  public:
 
    enum Level
    {
        Emergency,
        Alert,
        Critical,
        Error,
        Warning,
        Notice,
        Info,
        Debug
    };
 
  public:
 
    Log();
 
    virtual ~Log();
 
    Level getMinimumLogLevel();
 
    void setMinimumLogLevel(Level level);
 
    void append(const char *str);
 
    void setIdent(const char *ident);
 
    const char * getIdent() const;
 
    virtual void terminate() const;
 
  protected:
 
    virtual void write(const char *str) = 0;
 
  private:
 
    void flush(const bool force = false);
 
  private:
 
    Level m_minimumLogLevel;
 
    const char *m_ident;
 
    char m_outputBuffer[LogBufferSize];
 
    Size m_outputBufferWritten;
};
 
Log & operator << (Log &log, const char *str);
 
Log & operator << (Log &log, int number);
 
Log & operator << (Log &log, const char character);
 
Log & operator << (Log &log, unsigned number);
 
Log & operator << (Log &log, unsigned long number);
 
Log & operator << (Log &log, void *ptr);
 
#endif /* __LIB_LIBSTD_LOG_H */