/home/raskolnikov/dev/psynth/trunk/src/psynth/base/exception.hpp

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/*
 *  Copyright (C) 2009 Juan Pedro Bolívar Puente
 *
 *  This file is part of Psychosynth.
 *   
 *  Psychosynth 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Psychosynth 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, see <http://www.gnu.org/licenses/>.
 *
 */


#ifndef PSYNTH_EXCEPTION_H_
#define PSYNTH_EXCEPTION_H_

#include <exception>
#include <string>

namespace psynth
{
namespace base
{

class exception
{
public:
    virtual ~exception () throw () {}

    virtual void log () const;

    virtual const char* what () const throw () = 0;

    virtual const char* where () const throw () = 0;

    virtual int level () const throw () = 0;
};

class error_base : public virtual exception,
                   public virtual std::exception
{
public:
    error_base ()
    {}

    error_base (const std::string& what)
        : _what (what)
    {}
    
    virtual ~error_base () throw () {}

    virtual const char* what () const throw ()
    { return _what.empty () ? default_what () : _what.c_str (); }

    virtual const char* where () const throw ()
    { return "psynth"; }

    virtual int level () const throw ();

protected:
    virtual const char* default_what () const throw ();

private:
    std::string _what;
};

int default_error_level () throw ();

#define PSYNTH_DECLARE_ERROR(d_parent, d_error)                         \
    class d_error : public d_parent                                     \
    {                                                                   \
    public:                                                             \
        typedef d_parent base_type;                                     \
        d_error () {}                                                   \
        d_error (const std::string& s) : base_type (s) {}               \
        virtual const char* where () const throw ();                    \
    protected:                                                          \
        virtual const char* default_what () const throw ();             \
    };

#define PSYNTH_DEFINE_ERROR_WHERE_WHAT(d_error, d_where, d_what)        \
    const char* d_error::where () const throw ()                        \
    { return d_where; }                                                 \
    const char* d_error::default_what () const throw ()                 \
    { return d_what; }

#define PSYNTH_DEFINE_ERROR_WHERE(d_error, d_where)                     \
    const char* d_error::default_what () const throw ()                 \
    { return base_type::default_what (); }                              \
    const char* d_error::where () const throw ()                        \
    { return d_where; }                                                 \

#define PSYNTH_DEFINE_ERROR_WHAT(d_error, d_what)                       \
    const char* d_error::default_what () const throw ()                 \
    { return d_what; }                                                  \
    const char* d_error::where () const throw ()                        \
    { return PSYNTH_MODULE_NAME; }

#define PSYNTH_DEFINE_ERROR(d_error)                                    \
    const char* d_error::default_what () const  throw ()                \
    { return base_type::default_what (); }                              \
    const char* d_error::where () const throw ()                        \
    { return PSYNTH_MODULE_NAME; }

PSYNTH_DECLARE_ERROR (error_base, error);

} /* namespace base */
} /* namespace psynth */

#endif /* PSYNTH_EXCEPTION_H_ */