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//------------------------------------------------------------------------
// Copyright 2007-2009 (c) Jeff Brown <spadix@users.sourceforge.net>
//
// This file is part of the ZBar Bar Code Reader.
//
// The ZBar Bar Code Reader is free software; you can redistribute it
// and/or modify it under the terms of the GNU Lesser Public License as
// published by the Free Software Foundation; either version 2.1 of
// the License, or (at your option) any later version.
//
// The ZBar Bar Code Reader 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 Lesser Public License for more details.
//
// You should have received a copy of the GNU Lesser Public License
// along with the ZBar Bar Code Reader; if not, write to the Free
// Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301 USA
//
// http://sourceforge.net/projects/zbar
//------------------------------------------------------------------------
#ifndef _ZBAR_EXCEPTION_H_
#define _ZBAR_EXCEPTION_H_
/// @file
/// C++ Exception definitions
#ifndef _ZBAR_H_
#error "include zbar.h in your application, **not** zbar/Exception.h"
#endif
#include <cstddef>
#include <exception>
#include <new>
namespace zbar
{
/// base class for exceptions defined by this API.
class Exception : public std::exception
{
public:
/// create exception from C library error
Exception(const void *obj = NULL) : std::exception(), _obj(obj)
{
}
~Exception() throw()
{
}
/// retrieve error message
virtual const char *what() const throw()
{
if (!_obj)
return ("zbar library unspecified generic error");
return (_zbar_error_string(_obj, 0));
}
private:
const void *_obj;
};
/// internal library error.
class InternalError : public Exception
{
public:
/// create exception from C library error
InternalError(const void *obj) : Exception(obj)
{
}
};
/// unsupported request.
class UnsupportedError : public Exception
{
public:
/// create exception from C library error
UnsupportedError(const void *obj) : Exception(obj)
{
}
};
/// invalid request.
class InvalidError : public Exception
{
public:
/// create exception from C library error
InvalidError(const void *obj) : Exception(obj)
{
}
};
/// failed system call.
class SystemError : public Exception
{
public:
/// create exception from C library error
SystemError(const void *obj) : Exception(obj)
{
}
};
/// locking error.
class LockingError : public Exception
{
public:
/// create exception from C library error
LockingError(const void *obj) : Exception(obj)
{
}
};
/// all resources busy.
class BusyError : public Exception
{
public:
/// create exception from C library error
BusyError(const void *obj) : Exception(obj)
{
}
};
/// X11 display error.
class XDisplayError : public Exception
{
public:
/// create exception from C library error
XDisplayError(const void *obj) : Exception(obj)
{
}
};
/// X11 protocol error.
class XProtoError : public Exception
{
public:
/// create exception from C library error
XProtoError(const void *obj) : Exception(obj)
{
}
};
/// output window is closed.
class ClosedError : public Exception
{
public:
/// create exception from C library error
ClosedError(const void *obj) : Exception(obj)
{
}
};
/// image format error
class FormatError : public Exception
{
// FIXME needs c equivalent
virtual const char *what() const throw()
{
// FIXME what format?
return ("unsupported format");
}
};
/// @internal
/// extract error information and create exception.
static inline std::exception throw_exception(const void *obj)
{
switch (_zbar_get_error_code(obj)) {
case ZBAR_ERR_NOMEM:
throw std::bad_alloc();
case ZBAR_ERR_INTERNAL:
throw InternalError(obj);
case ZBAR_ERR_UNSUPPORTED:
throw UnsupportedError(obj);
case ZBAR_ERR_INVALID:
throw InvalidError(obj);
case ZBAR_ERR_SYSTEM:
throw SystemError(obj);
case ZBAR_ERR_LOCKING:
throw LockingError(obj);
case ZBAR_ERR_BUSY:
throw BusyError(obj);
case ZBAR_ERR_XDISPLAY:
throw XDisplayError(obj);
case ZBAR_ERR_XPROTO:
throw XProtoError(obj);
case ZBAR_ERR_CLOSED:
throw ClosedError(obj);
default:
throw Exception(obj);
}
}
} // namespace zbar
#endif
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