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https://github.com/gnustep/libs-gdl2.git
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b738a6145b
-describeTableNames]): implemented. * EOAccess/EOSQLExpression.h: added missing declaration. * EOAccess/EORelationship.m ([EORelationship -removeJoin:]): added cast. * EOAccess/EOModel.m ([EOModel -dealloc]): removes observer correctly. * EOAccess/EODatabaseContext.h: added missing declaration. * EOControl/EOFetchSpecification.m ([EOFetchSpecification -copyWithZone:]): fixed cast. ([EOFetchSpecification -hints]): added cast. * EOControl/EOClassDescription.m ([NSException +validationExceptionWithFormat:]), ([NSException +aggregateExceptionWithExceptions:]), ([NSException -exceptionAddingEntriesToUserInfo:]): renamed local variables. * rearranged header inclusion in all sources. git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gdl2/trunk@15409 72102866-910b-0410-8b05-ffd578937521
196 lines
2.8 KiB
Objective-C
196 lines
2.8 KiB
Objective-C
/**
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EONull.m <title>EONull Class</title>
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Copyright (C) 1996-2002 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@rccr.cremona.it>
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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 2 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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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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</license>
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**/
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static char rcsId[] = "$Id$";
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#import <Foundation/NSNull.h>
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#import <Foundation/NSString.h>
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#import <EOControl/EONull.h>
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#include "config.h"
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@implementation EONull
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static EONull *sharedEONull = nil;
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#ifndef FOUNDATION_HAS_KVC
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+ (void)initialize
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{
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// THREAD - do this operation under a lock
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sharedEONull = (EONull *)NSAllocateObject(self, 0, NSDefaultMallocZone());
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}
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+ null
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{
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return sharedEONull;
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}
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+ allocWithZone
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{
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return sharedEONull;
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}
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- copy
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{
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return self;
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}
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- copyWithZone: (NSZone *)zone
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{
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return self;
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}
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// One cannot destroy the shared null object
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- (id)retain
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{
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return self;
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}
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- (id)autorelease
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{
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return self;
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}
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- (void)release
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{
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}
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- (void)dealloc
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{
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}
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#else
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+ (void)initialize
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{
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sharedEONull = (EONull *)[NSNull null];
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}
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+ null
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{
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return sharedEONull;
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}
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+ allocWithZone
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{
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return sharedEONull;
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}
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- copy
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{
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return sharedEONull;
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}
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- copyWithZone: (NSZone *)zone
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{
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return sharedEONull;
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}
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- (id)retain
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{
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return sharedEONull;
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}
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- (id)autorelease
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{
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return sharedEONull;
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}
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- (void)release
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{
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}
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- (void)dealloc
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{
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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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#endif
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- (NSString *)sqlString
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{
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EOFLOGObjectFnStart();
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EOFLOGObjectFnStop();
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return @"NULL";
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}
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@end /* EONull */
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#ifdef FOUNDATION_HAS_KVC
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@implementation NSNull (EOSQLFormatting)
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- (NSString *)sqlString
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{
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EOFLOGObjectFnStart();
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EOFLOGObjectFnStop();
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return @"NULL";
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}
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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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#endif
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@implementation NSObject (EONull)
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- (BOOL)isEONull
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{
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return (((id)self) == sharedEONull || (((id)self) == [NSNull null]));
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}
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- (BOOL)isNotEONull
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{
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return ![self isEONull];
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}
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@end
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BOOL isNilOrEONull(id v)
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{
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return ((!v) || [v isEONull]);
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}
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