Logger.h

Go to the documentation of this file.

#ifndef OSMSCOUT_UTIL_LOGGER_H
#define OSMSCOUT_UTIL_LOGGER_H
 
/*
  This source is part of the libosmscout library
  Copyright (C) 2015  Tim Teulings
 
  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <string_view>
 
#include <osmscout/lib/CoreFeatures.h>
#include <osmscout/lib/CoreImportExport.h>
 
#include <osmscout/util/Distance.h>
#include <osmscout/util/StopClock.h>
 
// Since we have a DEBUG enumeration member
#ifdef DEBUG
#undef DEBUG
#endif
 
// Since we have a ERROR enumeration member
#ifdef ERROR
#undef ERROR
#endif
 
namespace osmscout {

  class OSMSCOUT_API Logger
  {
  public:
    enum Level {
      DEBUG,
      INFO,
      WARN,
      ERROR
    };

    class OSMSCOUT_API Destination
    {
    public:
      Destination() = default;
      virtual ~Destination() = default;

      virtual void Print(const std::string& value) = 0;

      virtual void Print(const std::string_view& value) = 0;

      virtual void Print(const char* value) = 0;

      virtual void Print(bool value) = 0;
      virtual void Print(short value) = 0;
      virtual void Print(unsigned short value) = 0;
      virtual void Print(int value) = 0;
      virtual void Print(unsigned int value) = 0;
      virtual void Print(long value) = 0;
      virtual void Print(unsigned long value) = 0;
      virtual void Print(long long value) = 0;
      virtual void Print(unsigned long long value) = 0;

      virtual void PrintLn() = 0;
    };

    class OSMSCOUT_API Line
    {
    private:
      Destination& destination;
 
    public:
      explicit Line(Destination& destination);
      virtual ~Line();
 
      Line& operator<<(const std::string& value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(const std::string_view& value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(const char* value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(bool value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(short value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(unsigned short value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(int value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(unsigned int value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(long value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(unsigned long value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(long long value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(unsigned long long value)
      {
        destination.Print(value);
 
        return *this;
      }
 
      Line& operator<<(float value);
      Line& operator<<(double value);
      Line& operator<<(void* value);
 
      Line& operator<<(const StopClock& value)
      {
        destination.Print(value.ResultString());
 
        return *this;
      }
 
      Line& operator<<(const Distance& value)
      {
        destination.Print(value.AsString());
 
        return *this;
      }
    };
 
  protected:
    virtual Line Log(Level level) = 0;
 
  public:
    Logger() = default;
    virtual ~Logger() = default;

    Line Debug();

    Line Info();

    Line Warn();

    Line Error();
  };

  class OSMSCOUT_API NoOpLogger : public Logger
  {
  private:
    class OSMSCOUT_API NoOpDestination : public Destination
    {
    public:
       void Print(const std::string& /*value*/) override
      {
        // no code
      }
 
       void Print(const std::string_view& /*value*/) override
      {
        // no code
      }
 
       void Print(const char* /*value*/) override
      {
        // no code
      }
 
       void Print(bool /*value*/) override
      {
        // no code
      }
 
       void Print(short /*value*/) override
      {
        // no code
      }
 
       void Print(unsigned short /*value*/) override
      {
        // no code
      }
 
       void Print(int /*value*/) override
      {
        // no code
      }
 
       void Print(unsigned int /*value*/) override
      {
        // no code
      }
 
       void Print(long /*value*/) override
      {
        // no code
      }
 
       void Print(unsigned long /*value*/) override
      {
        // no code
      }
 
       void Print(long long /*value*/) override
      {
        // no code
      }
 
       void Print(unsigned long long /*value*/) override
      {
        // no code
      }
 
       void PrintLn() override
      {
        // no code
      }
    };
 
  private:
    NoOpDestination destination;
 
  public:
     Line Log(Level /*level*/) override
    {
      return Line(destination);
    }
  };

  class OSMSCOUT_API Log
  {
  private:
    std::shared_ptr<Logger> logger;
    NoOpLogger              noOpLogger;
    bool                    logDebug=false;
    bool                    logInfo=true;
    bool                    logWarn=true;
    bool                    logError=true;
 
  public:
    Log();
    Log(const Log &log) = default;
    Log(Log &&log) = default;
 
    Log& operator=(const Log &log) = default;
    Log& operator=(Log &&log) = default;
 
    ~Log() = default;
 
    void SetLogger(const std::shared_ptr<Logger> &logger);
 
     Log& Debug(bool state)
    {
      logDebug=state;
 
      return *this;
    }
 
     bool IsDebug() const
    {
      return logDebug;
    }
 
     bool IsInfo() const
    {
      return logInfo;
    }
 
     bool IsWarn() const
    {
      return logWarn;
    }
 
     bool IsError() const
    {
      return logError;
    }
 
    Log& Info(bool state)
    {
      logInfo=state;
 
      return *this;
    }
 
    Log& Warn(bool state)
    {
      logWarn=state;
 
      return *this;
    }
 
    Log& Error(bool state)
    {
      logError=state;
 
      return *this;
    }
 
    Logger::Line Debug();
    Logger::Line Info();
    Logger::Line Warn();
    Logger::Line Error();
  };

  extern OSMSCOUT_API Log log;
}

 
#endif