/*! \file log.h
  This is the class Log definition.

  \author Jon A. Lambert
  \date 05/02/2003
  \version 0.30

  \warning
  I'm not sure if all streams are threadsafe, therefore it would be
  prudent not to set up separate Logs for each subsystem.
 */
#ifndef	LOG_H
#define	LOG_H

/*!
  The Log class implements a simple logging mechanism to either a file
  stream, or to the cout console stream depending on whether constructed
  with a valid filename or empty filename (cout).  Logging can be turned
  on and off by calling IsActive.

  \warning
  I'm not sure if all streams are threadsafe, therefore it would be
  prudent not to set up separate Logs for each subsystem.

  \todo
  Add different levels of logging, e.g. debug, trace, error, warning,
  info.  Quite possibly performance instrumentation could belong in this
  class.
 */
class Log {
public:
  Log(string& r_fname);
  Log(const char * fname);
  ~Log();
  void Write(const string& r_msg);
  void Write(const char *fmt, ...);
  void SetActive(bool b);
  bool IsActive();
private:
  Log(Log&);   
  Log& operator=(Log&);
  void SetTime();

  string mFileName;     //!< log's filename or empty if cout (console)
  ofstream * mpFile;    //!< file stream or null if cout (console)
  bool mActive;         //!< flag indicating if logging is on or off
  char mTimeStamp[40];  //!< current timestamp formatted \see SetTime
  CRITICAL_SECTION  mMutex; //!< To enforce mutual exclusion.
};

#endif //	LOG_H