factory.h

00001 
00002 /***************************************************************************
00003  *  factory.h - Logger factory
00004  *
00005  *  Created: Mon Jun 04 10:54:35 2007
00006  *  Copyright  2007  Tim Niemueller [www.niemueller.de]
00007  *
00008  ****************************************************************************/
00009 
00010 /*  This program is free software; you can redistribute it and/or modify
00011  *  it under the terms of the GNU General Public License as published by
00012  *  the Free Software Foundation; either version 2 of the License, or
00013  *  (at your option) any later version. A runtime exception applies to
00014  *  this software (see LICENSE.GPL_WRE file mentioned below for details).
00015  *
00016  *  This program is distributed in the hope that it will be useful,
00017  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00018  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00019  *  GNU Library General Public License for more details.
00020  *
00021  *  Read the full text in the LICENSE.GPL_WRE file in the doc directory.
00022  */
00023 
00024 #ifndef __UTILS_LOGGING_FACTORY_H_
00025 #define __UTILS_LOGGING_FACTORY_H_
00026 
00027 #include <core/exception.h>
00028 #include <core/exceptions/software.h>
00029 
00030 #include <cstddef>
00031 
00032 namespace fawkes {
00033 
00034 
00035 class UnknownLoggerTypeException : public Exception
00036 {
00037  public:
00038   UnknownLoggerTypeException(const char *msg = NULL);
00039 };
00040 
00041 class Logger;
00042 class MultiLogger;
00043 
00044 class LoggerFactory
00045 {
00046  public:
00047   static Logger * instance(const char *type, const char *as);
00048   static MultiLogger *multilogger_instance(const char *as);
00049 
00050   /** Get typed instance of logger.
00051    * Creates a new instance and converts it to the requested type. If the type
00052    * does not match the requested logger an exception is thrown.
00053    * @param type logger type
00054    * @param as logger argument string
00055    * @return typed logger instance
00056    * @exception TypeMismatchException thrown, if requested logger does not match
00057    * requested type.
00058    */
00059   template <class L>
00060     static L* instance(const char *type, const char *as);
00061 };
00062 
00063 
00064 template <class L>
00065 L *
00066 LoggerFactory::instance(const char *type, const char *as)
00067 {
00068   Logger *l = LoggerFactory::instance(type, as);
00069   L *tl = dynamic_cast<L *>(l);
00070   if ( tl == NULL ) {
00071     throw TypeMismatchException();
00072   }
00073   return tl;
00074 }
00075 
00076 } // end namespace fawkes
00077 
00078 #endif

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