libs/EDoc/Logger.cpp

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/*******************************************************************************

   Copyright (C) 2007 by Brendon Costa

   This library is free software; you can redistribute it and/or modify 
   it under the terms of the "LGPL Like" License defined in the file COPYING 
   that should have been distributed along with this source.

   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.  

   You should have received a copy of the "LGPL Like" License 
   along with this library; see the file COPYING. if not, it can be 
   obtained from the EDoc++ website: 
   http://edoc.sourceforge.net/license.html

*******************************************************************************/
#include "config.h"

#include "EDoc/Logger.h"
#include "EDoc/exceptions.h"
#include "EDoc/utils.h"

//getenv
#ifdef HAVE_STDLIB_H
   #include <stdlib.h>
#endif

//strcasecmp
#ifdef HAVE_STRING_H
   #include <string.h>
#endif

#ifdef HAVE_STRINGS_H
   #include <strings.h>
#endif

namespace EDoc
{
   //========================================================================
   Logger* Logger::instance = NULL;
   //========================================================================


   //========================================================================
   Logger::Logger() : 
      use_stdout(false),
      use_stderr(false),
      use_file(true),
      file_initialised(false)
   {
      const char* value = NULL;
      value = getenv("EDOC_LOGGER_STDERR");
      if (value)
      {
         use_stderr = !strcasecmp(value, "yes");
      }

      value = getenv("EDOC_LOGGER_STDOUT");
      if (value)
      {
         use_stdout = !strcasecmp(value, "yes");
      }

      filename="";
      use_file = true;
      value = getenv("EDOC_LOGGER_FILE");
      if (value)
      {
         use_file = strcasecmp(value, "no");
         if (use_file)
         {
            filename = value;
         }
      }
      
      if (use_file)
      {
         if (filename == "")
         {
            filename = MakeTemporaryFile("edoc_", ".log");
         }
         use_file = SetLogFilenameFullyQualified(filename);
      }
   }
   //========================================================================
   Logger::~Logger()
   {
      if (use_file)
      {
         file.close();
      }
   }
   //========================================================================
   bool Logger::SetLogFilenameFullyQualified(std::string filename_in)
   {
      // Close the old file if open.
      if (file)
      {
         file.close();
      }

      use_file = true;
      filename = filename_in;
      file_initialised = false;
      return true;
   }
   //===========================================================================
   void Logger::InitialiseFile()
   {
      // Close the old file if there was one.
      file.close();
      file.clear();
      
      // Open the new file.
      file.open(filename.c_str(), std::ios::out);
      if (!file)
      {
         EDOC_THROW_EXCEPTION(BugException, 
            "Failed to initialise logging framework.", "");
      }

      std::cerr << "Logs going to file: " << filename << std::endl;
      file_initialised = true;
   }
   //===========================================================================
}

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