lemon/error.h
author Balazs Dezso <deba@inf.elte.hu>
Tue, 29 Jul 2008 10:27:36 +0200
changeset 237 9c8efad5f587
parent 209 765619b7cbb2
child 280 e7f8647ce760
permissions -rw-r--r--
Fixing constness of Graph in GraphWriter
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/* -*- mode: C++; indent-tabs-mode: nil; -*-
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 *
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 * This file is a part of LEMON, a generic C++ optimization library.
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 *
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 * Copyright (C) 2003-2008
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 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
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 * (Egervary Research Group on Combinatorial Optimization, EGRES).
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 *
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 * Permission to use, modify and distribute this software is granted
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 * provided that this copyright notice appears in all copies. For
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 * precise terms see the accompanying LICENSE file.
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 *
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 * This software is provided "AS IS" with no warranty of any kind,
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 * express or implied, and with no claim as to its suitability for any
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 * purpose.
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 *
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 */
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#ifndef LEMON_ERROR_H
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#define LEMON_ERROR_H
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/// \ingroup exceptions
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/// \file
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/// \brief Basic exception classes and error handling.
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#include <exception>
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#include <string>
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#include <sstream>
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#include <iostream>
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#include <cstdlib>
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#include <memory>
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namespace lemon {
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  /// \addtogroup exceptions
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  /// @{
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  /// \brief Exception safe wrapper class.
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  ///
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  /// Exception safe wrapper class to implement the members of exceptions.
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  template <typename _Type>
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  class ExceptionMember {
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  public:
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    typedef _Type Type;
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    ExceptionMember() throw() {
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      try {
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        ptr.reset(new Type());
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      } catch (...) {}
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    }
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    ExceptionMember(const Type& type) throw() {
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      try {
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        ptr.reset(new Type());
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        if (ptr.get() == 0) return;
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        *ptr = type;
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      } catch (...) {}
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    }
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    ExceptionMember(const ExceptionMember& copy) throw() {
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      try {
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        if (!copy.valid()) return;
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        ptr.reset(new Type());
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        if (ptr.get() == 0) return;
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        *ptr = copy.get();
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      } catch (...) {}
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    }
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    ExceptionMember& operator=(const ExceptionMember& copy) throw() {
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      if (ptr.get() == 0) return;
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      try {
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        if (!copy.valid()) return;
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        *ptr = copy.get();
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      } catch (...) {}
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    }
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    void set(const Type& type) throw() {
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      if (ptr.get() == 0) return;
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      try {
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        *ptr = type;
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      } catch (...) {}
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    }
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    const Type& get() const {
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      return *ptr;
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    }
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    bool valid() const throw() {
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      return ptr.get() != 0;
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    }
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  private:
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    std::auto_ptr<_Type> ptr;
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  };
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  /// Exception-safe convenient error message builder class.
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  /// Helper class which provides a convenient ostream-like (operator <<
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  /// based) interface to create a string message. Mostly useful in
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  /// exception classes (therefore the name).
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  class ErrorMessage {
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  protected:
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    ///\e
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    ///\todo The good solution is boost::shared_ptr...
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    ///
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    mutable std::auto_ptr<std::ostringstream> buf;
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    ///\e
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    bool init() throw() {
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      try {
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        buf.reset(new std::ostringstream);
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      }
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      catch(...) {
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        buf.reset();
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      }
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      return buf.get();
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    }
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  public:
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    ///\e
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    ErrorMessage() throw() { init(); }
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    ErrorMessage(const ErrorMessage& em) throw() : buf(em.buf) { }
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    ///\e
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    ErrorMessage(const char *msg) throw() {
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      init();
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      *this << msg;
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    }
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    ///\e
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    ErrorMessage(const std::string &msg) throw() {
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      init();
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      *this << msg;
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    }
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    ///\e
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    template <typename T>
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    ErrorMessage& operator<<(const T &t) throw() {
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      if( ! buf.get() ) return *this;
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      try {
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        *buf << t;
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      }
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      catch(...) {
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        buf.reset();
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      }
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      return *this;
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    }
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    ///\e
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    const char* message() throw() {
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      if( ! buf.get() ) return 0;
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      const char* mes = 0;
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      try {
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        mes = buf->str().c_str();
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      }
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      catch(...) {}
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      return mes;
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    }
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  };
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  /// Generic exception class.
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  /// Base class for exceptions used in LEMON.
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  ///
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  class Exception : public std::exception {
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  public:
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    ///\e
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    Exception() {}
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    ///\e
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    virtual ~Exception() throw() {}
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    ///\e
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    virtual const char* what() const throw() {
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      return "lemon::Exception";
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    }
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  };
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  /// One of the two main subclasses of \ref Exception.
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  /// Logic errors represent problems in the internal logic of a program;
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  /// in theory, these are preventable, and even detectable before the
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  /// program runs (e.g. violations of class invariants).
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  ///
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  /// A typical example for this is \ref UninitializedParameter.
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  class LogicError : public Exception {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::LogicError";
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    }
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  };
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  /// \ref Exception for uninitialized parameters.
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  /// This error represents problems in the initialization
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  /// of the parameters of the algorithms.
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  class UninitializedParameter : public LogicError {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::UninitializedParameter";
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    }
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  };
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  /// One of the two main subclasses of \ref Exception.
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  /// Runtime errors represent problems outside the scope of a program;
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  /// they cannot be easily predicted and can generally only be caught
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  /// as the program executes.
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  class RuntimeError : public Exception {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::RuntimeError";
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    }
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  };
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  ///\e
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  class RangeError : public RuntimeError {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::RangeError";
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    }
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  };
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  ///\e
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  class IoError : public RuntimeError {
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  public:
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    virtual const char* what() const throw() {
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      return "lemon::IoError";
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    }
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  };
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  ///\e
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  class DataFormatError : public IoError {
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  protected:
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    ExceptionMember<std::string> _message;
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    ExceptionMember<std::string> _file;
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    int _line;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    DataFormatError(const DataFormatError &dfe) :
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      IoError(dfe), _message(dfe._message), _file(dfe._file),
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      _line(dfe._line) {}
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    ///\e
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    explicit DataFormatError(const char *the_message)
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      : _message(the_message), _line(0) {}
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    ///\e
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    DataFormatError(const std::string &file_name, int line_num,
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                    const char *the_message)
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      : _message(the_message), _line(line_num) { file(file_name); }
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    ///\e
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    void line(int ln) { _line = ln; }
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    ///\e
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    void message(const std::string& msg) { _message.set(msg); }
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    ///\e
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    void file(const std::string &fl) { _file.set(fl); }
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    ///\e
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    int line() const { return _line; }
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    ///\e
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    const char* message() const {
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      if (_message.valid() && !_message.get().empty()) {
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        return _message.get().c_str();
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      } else {
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        return 0;
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      }
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    }
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    /// \brief Returns the filename.
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    ///
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    /// Returns \e null if the filename was not specified.
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    const char* file() const {
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      if (_file.valid() && !_file.get().empty()) {
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        return _file.get().c_str();
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      } else {
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        return 0;
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      }
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    }
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    ///\e
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    virtual const char* what() const throw() {
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      try {
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        std::ostringstream ostr;
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        ostr << "lemon:DataFormatError" << ": ";
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        if (message()) ostr << message();
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        if( file() || line() != 0 ) {
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          ostr << " (";
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          if( file() ) ostr << "in file '" << file() << "'";
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          if( file() && line() != 0 ) ostr << " ";
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          if( line() != 0 ) ostr << "at line " << line();
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          ostr << ")";
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        }
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        _message_holder.set(ostr.str());
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      }
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      catch (...) {}
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      if( _message_holder.valid()) return _message_holder.get().c_str();
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      return "lemon:DataFormatError";
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    }
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    virtual ~DataFormatError() throw() {}
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  };
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  ///\e
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  class FileOpenError : public IoError {
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  protected:
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    ExceptionMember<std::string> _file;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    FileOpenError(const FileOpenError &foe) :
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      IoError(foe), _file(foe._file) {}
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    ///\e
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    explicit FileOpenError(const std::string& fl)
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      : _file(fl) {}
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    ///\e
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    void file(const std::string &fl) { _file.set(fl); }
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    /// \brief Returns the filename.
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    ///
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    /// Returns \e null if the filename was not specified.
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    const char* file() const {
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      if (_file.valid() && !_file.get().empty()) {
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        return _file.get().c_str();
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      } else {
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        return 0;
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      }
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    }
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    ///\e
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    virtual const char* what() const throw() {
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      try {
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        std::ostringstream ostr;
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        ostr << "lemon::FileOpenError" << ": ";
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        ostr << "Cannot open file - " << file();
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        _message_holder.set(ostr.str());
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      }
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      catch (...) {}
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      if( _message_holder.valid()) return _message_holder.get().c_str();
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      return "lemon::FileOpenError";
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    }
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    virtual ~FileOpenError() throw() {}
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  };
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  class IoParameterError : public IoError {
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  protected:
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    ExceptionMember<std::string> _message;
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    ExceptionMember<std::string> _file;
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    mutable ExceptionMember<std::string> _message_holder;
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  public:
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    IoParameterError(const IoParameterError &ile) :
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      IoError(ile), _message(ile._message), _file(ile._file) {}
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    ///\e
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    explicit IoParameterError(const char *the_message)
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      : _message(the_message) {}
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    ///\e
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    IoParameterError(const char *file_name, const char *the_message)
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      : _message(the_message), _file(file_name) {}
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     ///\e
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    void message(const std::string& msg) { _message.set(msg); }
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    ///\e
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    void file(const std::string &fl) { _file.set(fl); }
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     ///\e
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    const char* message() const {
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      if (_message.valid()) {
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        return _message.get().c_str();
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      } else {
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        return 0;
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      }
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    }
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    /// \brief Returns the filename.
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    ///
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    /// Returns \c 0 if the filename was not specified.
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    const char* file() const {
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      if (_file.valid()) {
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        return _file.get().c_str();
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      } else {
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        return 0;
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      }
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    }
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    ///\e
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    virtual const char* what() const throw() {
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      try {
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        std::ostringstream ostr;
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        if (message()) ostr << message();
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        if (file()) ostr << "(when reading file '" << file() << "')";
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        _message_holder.set(ostr.str());
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      }
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      catch (...) {}
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      if( _message_holder.valid() ) return _message_holder.get().c_str();
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      return "lemon:IoParameterError";
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    }
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    virtual ~IoParameterError() throw() {}
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  };
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  /// @}
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}
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#endif // LEMON_ERROR_H