ObjFW  Diff

 */

#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: [self class]
			      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;
}

- (OFString*)JSONRepresentation
{
	return @"null";
}