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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gdl2/trunk@30496 72102866-910b-0410-8b05-ffd578937521
104 lines
2.2 KiB
Objective-C
104 lines
2.2 KiB
Objective-C
/**
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EONull.m <title>EONull Class</title>
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Copyright (C) 1996-2002,2003,2004,2005 Free Software Foundation, Inc.
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Author: Mircea Oancea <mircea@jupiter.elcom.pub.ro>
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Date: 1996
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Author: Mirko Viviani <mirko.viviani@gmail.com>
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Date: February 2000
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$Revision$
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$Date$
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<abstract></abstract>
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This file is part of the GNUstep Database Library.
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<license>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; see the file COPYING.LIB.
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If not, write to the Free Software Foundation,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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</license>
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**/
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#include "config.h"
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RCS_ID("$Id$")
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#ifdef GNUSTEP
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#include <Foundation/NSString.h>
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#else
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#include <Foundation/Foundation.h>
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#endif
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#ifndef GNUSTEP
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#include <GNUstepBase/GNUstep.h>
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#endif
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#include <EOControl/EONull.h>
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#include <EOControl/EODebug.h>
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@implementation EONull (EOSQLFormatting)
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- (NSString *)sqlString
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{
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return @"NULL";
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}
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//OK
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- (id)valueForKey:(NSString *)key
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{
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return self;
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}
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@end
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/*
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* We keep this class to support NSClassFromString() which
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* scripting libraries may depend on. Note that this is
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* not a fail-safe implementation. You should rely on
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* [EONull+null] and pointer comparison. Do not rely on
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* [obj isKindOfClass: NSClassFromString(@"EONull")]
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* or similar constructs. They will return wrong results.
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* This is a small backdraw from using the new extension classes
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* in base / Foundation.
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*/
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#undef EONull
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@interface EONull : NSNull
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@end
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@implementation EONull
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+ (Class) class
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{
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return [NSNull class];
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}
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+ (id) allocWithZone: (NSZone *)zone
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{
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return [NSNull null];
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}
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+ null
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{
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return [NSNull null];
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}
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@end
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