///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002-2012, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IEXBASEEXC_H
#define INCLUDED_IEXBASEEXC_H

#include "IexNamespace.h"
#include "IexExport.h"

//----------------------------------------------------------
//
//	A general exception base class, and a few
//	useful exceptions derived from the base class.
//
//----------------------------------------------------------

#include <string>
#include <exception>
#include <sstream>

IEX_INTERNAL_NAMESPACE_HEADER_ENTER


//-------------------------------
// Our most basic exception class
//-------------------------------

class BaseExc: public std::string, public std::exception
{
  public:

    //----------------------------
    // Constructors and destructor
    //----------------------------

    IEX_EXPORT BaseExc (const char *s = 0) throw();     // std::string (s)
    IEX_EXPORT BaseExc (const std::string &s) throw();  // std::string (s)
    IEX_EXPORT BaseExc (std::stringstream &s) throw();  // std::string (s.str())

    IEX_EXPORT BaseExc (const BaseExc &be) throw();
    IEX_EXPORT virtual ~BaseExc () throw ();

    //--------------------------------------------
    // what() method -- e.what() returns e.c_str()
    //--------------------------------------------

    IEX_EXPORT virtual const char * what () const throw ();


    //--------------------------------------------------
    // Convenient methods to change the exception's text
    //--------------------------------------------------

    IEX_EXPORT BaseExc &            assign (std::stringstream &s);	// assign (s.str())
    IEX_EXPORT BaseExc &            operator = (std::stringstream &s);

    IEX_EXPORT BaseExc &            append (std::stringstream &s);	// append (s.str())
    IEX_EXPORT BaseExc &            operator += (std::stringstream &s);


    //--------------------------------------------------
    // These methods from the base class get obscured by
    // the definitions above.
    //--------------------------------------------------

    IEX_EXPORT BaseExc &            assign (const char *s);
    IEX_EXPORT BaseExc &            operator = (const char *s);

    IEX_EXPORT BaseExc &            append (const char *s);
    IEX_EXPORT BaseExc &            operator += (const char *s);


    //--------------------------------------------------
    // Stack trace for the point at which the exception
    // was thrown.  The stack trace will be an empty
    // string unless a working stack-tracing routine
    // has been installed (see below, setStackTracer()).
    //--------------------------------------------------

    IEX_EXPORT const std::string &  stackTrace () const;

  private:

    std::string                     _stackTrace;
};


//-----------------------------------------------------
// A macro to save typing when declararing an exception
// class derived directly or indirectly from BaseExc:
//-----------------------------------------------------

#define DEFINE_EXC_EXP(exp, name, base)                         \
    class exp name: public base                                 \
    {                                                           \
      public:                                                   \
        name()                         throw(): base (0)    {}  \
        name (const char* text)        throw(): base (text) {}  \
        name (const std::string &text) throw(): base (text) {}  \
        name (std::stringstream &text) throw(): base (text) {}  \
        ~name() throw() { }                                     \
    };

// For backward compatibility.
#define DEFINE_EXC(name, base) DEFINE_EXC_EXP(, name, base)


//--------------------------------------------------------
// Some exceptions which should be useful in most programs
//--------------------------------------------------------
DEFINE_EXC_EXP (IEX_EXPORT, ArgExc, BaseExc)    // Invalid arguments to a function call

DEFINE_EXC_EXP (IEX_EXPORT, LogicExc, BaseExc)  // General error in a program's logic,
                                                // for example, a function was called
                                                // in a context where the call does
                                                // not make sense.

DEFINE_EXC_EXP (IEX_EXPORT, InputExc, BaseExc)  // Invalid input data, e.g. from a file

DEFINE_EXC_EXP (IEX_EXPORT, IoExc, BaseExc)     // Input or output operation failed

DEFINE_EXC_EXP (IEX_EXPORT, MathExc, BaseExc) 	// Arithmetic exception; more specific
                                                // exceptions derived from this class
                                                // are defined in ExcMath.h

DEFINE_EXC_EXP (IEX_EXPORT, ErrnoExc, BaseExc)  // Base class for exceptions corresponding
                                                // to errno values (see errno.h); more
                                                // specific exceptions derived from this
                                                // class are defined in ExcErrno.h

DEFINE_EXC_EXP (IEX_EXPORT, NoImplExc, BaseExc) // Missing method exception e.g. from a
                                                // call to a method that is only partially
                                                // or not at all implemented. A reminder
                                                // to lazy software people to get back
                                                // to work.

DEFINE_EXC_EXP (IEX_EXPORT, NullExc, BaseExc)   // A pointer is inappropriately null.

DEFINE_EXC_EXP (IEX_EXPORT, TypeExc, BaseExc)   // An object is an inappropriate type,
                                                // i.e. a dynamnic_cast failed.


//----------------------------------------------------------------------
// Stack-tracing support:
// 
// setStackTracer(st)
//
//	installs a stack-tracing routine, st, which will be called from
//	class BaseExc's constructor every time an exception derived from
//	BaseExc is thrown.  The stack-tracing routine should return a
//	string that contains a printable representation of the program's
//	current call stack.  This string will be stored in the BaseExc
//	object; the string is accesible via the BaseExc::stackTrace()
//	method.
//
// setStackTracer(0)
//
//	removes the current stack tracing routine.  When an exception
//	derived from BaseExc is thrown, the stack trace string stored
//	in the BaseExc object will be empty.
//
// stackTracer()
//
//	returns a pointer to the current stack-tracing routine, or 0
//	if there is no current stack stack-tracing routine.
// 
//----------------------------------------------------------------------

typedef std::string (* StackTracer) ();

IEX_EXPORT void        setStackTracer (StackTracer stackTracer);
IEX_EXPORT StackTracer stackTracer ();


//-----------------
// Inline functions
//-----------------

inline BaseExc &
BaseExc::operator = (std::stringstream &s)
{
    return assign (s);
}


inline BaseExc &
BaseExc::operator += (std::stringstream &s)
{
    return append (s);
}


inline BaseExc &
BaseExc::assign (const char *s)
{
    std::string::assign(s);
    return *this;
}


inline BaseExc &
BaseExc::operator = (const char *s)
{
    return assign(s);
}


inline BaseExc &
BaseExc::append (const char *s)
{
    std::string::append(s);
    return *this;
}


inline BaseExc &
BaseExc::operator += (const char *s)
{
    return append(s);
}


inline const std::string &
BaseExc::stackTrace () const
{
    return _stackTrace;
}


IEX_INTERNAL_NAMESPACE_HEADER_EXIT

#endif // INCLUDED_IEXBASEEXC_H
