logger.hh

#ifndef __SDR_LOGGER_HH__
#define __SDR_LOGGER_HH__

#include <string>
#include <sstream>
#include <list>


namespace sdr {

typedef enum {
  LOG_DEBUG,   
  LOG_INFO,    
  LOG_WARNING, 
  LOG_ERROR    
} LogLevel;


class LogMessage: public std::stringstream
{
public:
  LogMessage(LogLevel level, const std::string &msg="");
  LogMessage(const LogMessage &other);
  virtual ~LogMessage();

  LogLevel level() const;
  inline std::string message() const { return this->str(); }

protected:
  LogLevel _level;
};


class LogHandler
{
protected:
  LogHandler();

public:
  virtual ~LogHandler();
  virtual void handle(const LogMessage &msg) = 0;
};



class StreamLogHandler: public LogHandler
{
public:
  StreamLogHandler(std::ostream &stream, LogLevel level);
  virtual ~StreamLogHandler();

  virtual void handle(const LogMessage &msg);

protected:
  std::ostream &_stream;
  LogLevel _level;
};



class Logger
{
protected:
  Logger();

public:
  virtual ~Logger();

  static Logger &get();

  void log(const LogMessage &message);

  void addHandler(LogHandler *handler);

protected:
  static Logger *_instance;
  std::list<LogHandler *> _handler;
};

}

#endif // __SDR_LOGGER_HH__