exceptions.h

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/*
 *  Copyright (C) 2000-2002  The Exult Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef EXCEPTIONS_H
#define EXCEPTIONS_H

#ifndef ALPHA_LINUX_CXX
#  include <cerrno>
#endif
#include <stdexcept>
#include <string>

/*
 *  Base class of all our exceptions, providing a storage for the error message
 */

class exult_exception : public std::exception {
  std::string  what_;
  int errno_;
public:
  exult_exception (const char *what_arg): what_ (what_arg), errno_(errno) {  }  
  exult_exception (const std::string& what_arg): what_ (what_arg), errno_(errno) {  }
  const char *what() const throw () { return what_.c_str(); }
  int get_errno(void) const { return errno_; }
  virtual ~exult_exception () throw() {}
};


/*
 *  A quit exception can be thrown to quit the program
 */

class quit_exception : public exult_exception
{
  int result_;
public:
  quit_exception (int result = 0): exult_exception ("Quit"), result_(result) {  }
  int get_result(void) const { return result_; }
};

/*
 *  Classes which should not be replicatable throw an replication_exception
 */

class replication_exception : public exult_exception
{
public:
  replication_exception (const char *what_arg): exult_exception (what_arg) {  } 
  replication_exception (const std::string& what_arg): exult_exception (what_arg) {  }
};

// Some handy macros which you can use to make a class non-replicable
#define UNREPLICATABLE_CLASS(NAME)  NAME(const NAME &) { throw replication_exception( #NAME " cannot be replicated"); }; \
          NAME &operator=(const NAME &) { throw replication_exception( #NAME " cannot be replicated"); return *this; }

#define UNREPLICATABLE_CLASS_I(NAME,INIT) NAME(const NAME &) : INIT { throw replication_exception( #NAME " cannot be replicated"); }; \
          NAME &operator=(const NAME &) { throw replication_exception( #NAME " cannot be replicated"); return *this; }



/*
 *  File errors
 */

class file_exception : public exult_exception
{
public:
  file_exception (const char *what_arg): exult_exception (what_arg) {  }  
  file_exception (const std::string& what_arg): exult_exception (what_arg) {  }
};

class file_open_exception : public file_exception {
  static const std::string  prefix_;
public:
  file_open_exception (const std::string& file): file_exception("Error opening file "+file) {  }
};

class file_write_exception : public file_exception {
  static const std::string  prefix_;
public:
  file_write_exception(const std::string& file): file_exception("Error writing to file "+file) {  }
};

class file_read_exception : public file_exception {
  static const std::string  prefix_;
public:
  file_read_exception(const std::string& file): file_exception("Error reading from file "+file) {  }
};

class wrong_file_type_exception : public file_exception {
public:
  wrong_file_type_exception (const std::string& file, const std::string& type): file_exception("File "+file+" is not of type "+type) {  }
};


/*
 *  Exception that gets fired when the user aborts something
 */
class UserBreakException
{
};

#endif

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