GenericException.h

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/*
 * GenericException.h
 *
 * Smalltalk like class library for C++
 * Abstract exception. Header.
 *
 * Copyright (c) 2003 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __GENERICEXCEPTION_H
#define __GENERICEXCEPTION_H

#include <stlib/Object.h>

#define MAXSTACKSIZE 64

namespace Core {

class String;
class Stream;

class GenericException : public Object
{
  protected:
    String *messageText;      //< Exception description
    String *_selector;        //< Method the exception occured in
    const Object *_originator;     //< Object the exception occured in
    Object *_parameter;       //< Argument that possibly caused the exception

    static GenericException *last_exception; //< What was the last raised exception

  private:
    /* These variables are too low level. Better not to play with them. */
    void *method_stack[MAXSTACKSIZE]; //< Array of methods that was on stack when an exception occurs
    int stack_size;             //< Size of method_stack

  public:
    GenericException(String *message = nil, String *selector = nil,
                     Object *param = nil);

    virtual ~GenericException(void);

    /* Class-accessing protocol */
    virtual String *className(void) const;
    static GenericException *lastException(void);

    /* Accessing protocol */
    virtual String *description(void);
    virtual String *notifierString(void) abstract;
    virtual const Object *originator(void);
    virtual void originator(const Object *object);
    virtual Object *parameter(void);
    virtual void selector(String *sel);
    virtual void selector(const char *sel);
    virtual String *selector(void);

    /* Printing protocol */
    virtual void printStackOn(Stream *stream);

    /* Raising protocol */
    virtual void pass(void);

    virtual void raiseFrom(const Object *origin);

    virtual void raise(void);

    /* Visiting protocol */
    virtual void visitBy(Visitor *visitor);

  protected:
    /* Private protocol */
    virtual void getExecutionStack(void);
    virtual void privRaise(void) abstract;
};

#define _ensure(guardedBlock, ensureBlock) \
    GenericException *_catched_exception = nil; \
    try { guardedBlock ; } \
    catch (GenericException *ex) { _catched_exception = ex; } \
    ensureBlock ; \
    if (_catched_exception != nil) _catched_exception->pass()

};

#endif /* __GENERICEXCEPTION_H */

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