API 0.9.5
Foundation/CPNull.j
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00001 /*
00002  * CPNull.j
00003  * Foundation
00004  *
00005  * Created by Francisco Tolmasky.
00006  * Copyright 2008, 280 North, Inc.
00007  *
00008  * This library is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * This library is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with this library; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 
00024 var CPNullSharedNull = nil;
00025 
00034 @implementation CPNull : CPObject
00035 {
00036     id __doxygen__;
00037 }
00038 
00039 /*+ (id)alloc
00040 {
00041     if (CPNullSharedNull)
00042         return CPNullSharedNull;
00043 
00044     return [super alloc];
00045 }*/
00046 
00052 + (CPNull)null
00053 {
00054     if (!CPNullSharedNull)
00055         CPNullSharedNull = [[CPNull alloc] init];
00056 
00057     return CPNullSharedNull;
00058 }
00059 
00060 - (BOOL)isEqual:(id)anObject
00061 {
00062     if (self === anObject)
00063         return YES;
00064 
00065     return [anObject isKindOfClass:[CPNull class]];
00066 }
00067 
00073 - (id)initWithCoder:(CPCoder)aCoder
00074 {
00075     return [CPNull null];
00076 }
00077 
00083 - (void)encodeWithCoder:(CPCoder)aCoder
00084 {
00085 }
00086 
00087 @end
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