Log.hh

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#ifndef _LOGHH_
#define _LOGHH_

#include <openmodeller/os_specific.hh>
#include <openmodeller/om_defs.hh>

#include <iostream>
#include <fstream>
#include <string>
#include <stdarg.h>
#include <stdio.h>

/****************************************************************/
/****************************** Log *****************************/

class dllexp Log
{
  public:
    static Log * instance();

    typedef enum {
      Debug   =0,
      Default =1,
      Info    =2,
      Warn    =3,
      Error   =4
    } Level;

#ifndef SWIG
    class LogCallback {
      public:
        virtual ~LogCallback(){};
        virtual void operator()( Level level, const std::string& msg ) = 0;
    };

    class OstreamCallback : public LogCallback {
      public:
        OstreamCallback( std::ostream& os );
        void operator()( Level level, const std::string& msg );
      private:
        std::ostream& os;
    };
#endif

  protected:
    Log( );

  public:

    static std::string format( const char *fmt, ... );

    ~Log();

    void set( Level level, std::string fileName, char const *pref="" );

    void setCallback( LogCallback *lc );

    void setLevel( Level level )  { _level = level; }

    void setPrefix( const char *pref );

    void debug( const char *format, ... );  
    void info ( const char *format, ... );  
    void warn ( const char *format, ... );  
    void error( const char *format, ... );  

    void operator()( const char *format, ... );

  private:

    //write log out to callback
   void FormatAndWrite( Log::LogCallback& lc, Log::Level level, std::string pref, const char* format, va_list ap );

    static Log * mpInstance;

    LogCallback* callback;

    Level _level;

    std::string _pref;

    bool _deleteCallback; // flag indicating if the callback should be deleted by Log
};

#endif