phexception.h

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// -*- C++ -*-
/*
  Phrasehunter - index and query text corpora
  Copyright (C) 2006  Torsten Marek (shlomme@gmx.de) &
                      Armin Schmidt (armin.sch@gmail.com)
  
  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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#ifndef PHEXCEPTION_H
#define PHEXCEPTION_H PHEXCEPTION_H

#include <string>

namespace PhraseHunter {

namespace Exceptions {

//! Base class for Phrasehunter exceptions.
class Exception 
{
    static const unsigned int ERRMSG_SIZE = 40;
    
    char m_msg[ERRMSG_SIZE];
public:
    Exception(const std::string& msg) // make this a const char* and strncopy it?
    {
      // this might look stupid, but it avoids memory allocation inside of exceptions
      // exceptions live in a "third space" and thus the array is guaranteed to be 
      // there when the exception is created. Thus, one cannot run out of memory
      // during exception creation (which would result in an exception, which in turn
      // would abort() the program
      // Feel free to hit me if I'm talking nonsense /t
      int bytesCopied = msg.copy(m_msg, ERRMSG_SIZE - 1);
      m_msg[bytesCopied] = '\0';
    }
    const char* what() const { return m_msg; }
    
};

class FileError: public Exception
{
public:
    FileError(const std::string& msg) : Exception(msg) {}
};

class DatabaseError: public Exception 
{
public:
    DatabaseError(const std::string& msg): Exception(msg) {}
};

class UnicodeError: public Exception 
{
public:
    UnicodeError(const std::string& msg): Exception(msg) {}
};

class CorpusError : public Exception
{
public:
    CorpusError(const std::string& msg) : Exception(msg) {}
};

class NoSuchCorpusError : public CorpusError
{
public:
    NoSuchCorpusError(const std::string& msg) : CorpusError(msg) {}
};

class NoIndexerError : public CorpusError
{
public:
    NoIndexerError(): CorpusError("Indexer not opened") {}
};


}
}

#endif //PHEXCEPTION_H

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