ObjFW  Artifact [6eac9873fd]

Artifact 6eac9873fdaa47190ece371b47edf2c9733134e15c7908181be8df52f18dfcb6:

• File src/OFNull.m — part of check-in [e1e7ffa903] at 2011-09-22 23:25:42 on branch trunk — Exceptions are now autoreleased.

  This is safe as an "exception loop" can't happen, since if allocating
  an exception fails, it throws an OFAllocFailedException which is
  preallocated and can always be thrown.

  So, the worst case would be that an autorelease of an exception fails,
  triggering an OFOutOfMemoryException for which there is no memory,
  resulting in an OFAllocFailedException to be thrown. (user: js, size: 1961) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008, 2009, 2010, 2011
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#import "OFNull.h"
#import "OFString.h"
#import "OFXMLElement.h"
#import "OFAutoreleasePool.h"

#import "OFInvalidArgumentException.h"
#import "OFNotImplementedException.h"

static OFNull *null = nil;

@implementation OFNull
+ null
{
	if (null != nil)
		return null;

	null = [[self alloc] init];

	return null;
}

- initWithSerialization: (OFXMLElement*)element
{
	OFAutoreleasePool *pool;

	[self release];

	pool = [[OFAutoreleasePool alloc] init];

	if (![[element name] isEqual: [self className]] ||
	    ![[element namespace] isEqual: OF_SERIALIZATION_NS])
		@throw [OFInvalidArgumentException exceptionWithClass: isa
							     selector: _cmd];

	[pool release];

	return [OFNull null];
}

- (OFString*)description
{
	return @"<null>";
}

- copy
{
	return self;
}

- (OFXMLElement*)XMLElementBySerializing
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	OFXMLElement *element;

	element = [OFXMLElement elementWithName: [self className]
				      namespace: OF_SERIALIZATION_NS];

	[element retain];
	[pool release];
	[element autorelease];

	return element;
}

- autorelease
{
	return self;
}

- retain
{
	return self;
}

- (void)release
{
}

- (unsigned int)retainCount
{
	return OF_RETAIN_COUNT_MAX;
}

- (void)dealloc
{
	@throw [OFNotImplementedException exceptionWithClass: isa
						    selector: _cmd];
	[super dealloc];	/* Get rid of a stupid warning */
}
@end