/*
 * Portable Object Compiler (c) 2003.  All Rights Reserved.
 * $Id: Exceptn.m,v 1.3 2003/09/30 20:20:27 stes Exp $
 */

/*
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published 
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifdef __PORTABLE_OBJC__

#ifndef __OBJECT_INCLUDED__
#define __OBJECT_INCLUDED__
#include "Object.h"		/* Stepstone Object.h assumes #import */
#endif

#include "Exceptn.h"
#include "Block.h"

@implementation Exception

/*****************************************************************************
 *
 * Installing Handlers
 *
 ****************************************************************************/

+ install:aHandler
{
  if (handler)
    {
      handler = [aHandler push:handler];
    }
  else
    {
      handler = aHandler;
    }
  return self;
}

/*****************************************************************************
 *
 * Default Action
 *
 ****************************************************************************/

- defaultAction
{
  return [self subclassResponsibility];
}

/*****************************************************************************
 *
 * Creation
 *
 ****************************************************************************/

+ signal
{
  return [[self new] signal];
}

+ signal:(STR)message
{
  return [[self new] signal:message];
}

- free
{
  if (messageText)
    messageText = [messageText free];
  return [super free];
}


/*****************************************************************************
 *
 * Signalling
 *
 ****************************************************************************/

- signal
{
  if (handler)
    {
      resumeHandler = handler;
      handler = [handler pop];
      return [resumeHandler value:self];
    }
  else
    {
      return [self halt:messageText];
    }
}

- signal:(STR)message
{
  return [[self messageText:message] signal];
}

- messageText
{
  return messageText;
}

- (STR) str
{
  return [messageText str];
}

- messageText:message
{
  messageText = message;
  return self;
}

- str:(STR)message
{
  static id MsgClass;
  id aMessage;
  if (!MsgClass)
    MsgClass = [self findClass:"String"];
  return [self messageText:[MsgClass str:message]];
}

/*****************************************************************************
 *
 * Re-Signalling
 *
 ****************************************************************************/

- resignalAs:replacementException
{
  return [self notImplemented];
}

- resume
{
  handler = resumeHandler;
  return self;
}
@end

#endif /* __PORTABLE_OBJC__ */