/* * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, * 2018, 2019 * Jonathan Schleifer <js@heap.zone> * * 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 "OFData.h" #import "OFInvalidArgumentException.h" @interface OFNull () - (OFString *)of_JSONRepresentationWithOptions: (int)options depth: (size_t)depth; @end static OFNull *null = nil; @implementation OFNull + (void)initialize { null = [[self alloc] init]; } + (OFNull *)null { return null; } - (instancetype)initWithSerialization: (OFXMLElement *)element { void *pool; [self release]; pool = objc_autoreleasePoolPush(); if (![element.name isEqual: self.className] || ![element.namespace isEqual: OF_SERIALIZATION_NS]) @throw [OFInvalidArgumentException exception]; objc_autoreleasePoolPop(pool); return [OFNull null]; } - (OFString *)description { return @"<null>"; } - (id)copy { return self; } - (OFXMLElement *)XMLElementBySerializing { void *pool = objc_autoreleasePoolPush(); OFXMLElement *element; element = [OFXMLElement elementWithName: self.className namespace: OF_SERIALIZATION_NS]; [element retain]; objc_autoreleasePoolPop(pool); return [element autorelease]; } - (OFString *)JSONRepresentation { return [self of_JSONRepresentationWithOptions: 0 depth: 0]; } - (OFString *)JSONRepresentationWithOptions: (int)options { return [self of_JSONRepresentationWithOptions: options depth: 0]; } - (OFString *)of_JSONRepresentationWithOptions: (int)options depth: (size_t)depth { return @"null"; } - (OFData *)messagePackRepresentation { uint8_t type = 0xC0; return [OFData dataWithItems: &type count: 1]; } - (instancetype)autorelease { return self; } - (instancetype)retain { return self; } - (void)release { } - (unsigned int)retainCount { return OF_RETAIN_COUNT_MAX; } - (void)dealloc { OF_DEALLOC_UNSUPPORTED } @end