// // $Id$ // // SPNotLoaded.m // sequel-pro // // Created by Rowan Beentje on October 7, 2009. // Copyright (c) 2009 Rowan Beentje. All rights reserved. // // Permission is hereby granted, free of charge, to any person // obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without // restriction, including without limitation the rights to use, // copy, modify, merge, publish, distribute, sublicense, and/or sell // copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following // conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES // OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR // OTHER DEALINGS IN THE SOFTWARE. // // More info at <http://code.google.com/p/sequel-pro/> #import "SPNotLoaded.h" static SPNotLoaded *notLoaded = nil; @implementation SPNotLoaded // Return the singleton object + (SPNotLoaded *)notLoaded { @synchronized(self) { if (notLoaded == nil) { notLoaded = [[super allocWithZone:NULL] init]; } } return notLoaded; } + (id)allocWithZone:(NSZone *)zone { @synchronized(self) { return [[self notLoaded] retain]; } return nil; } - (id)init { Class notLoadedClass = [self class]; @synchronized(notLoadedClass) { if (notLoaded == nil) { if ((self = [super init])) { notLoaded = self; } } } return notLoaded; } - (id)copyWithZone:(NSZone *)zone { return self; } - (id)retain { return self; } - (NSUInteger)retainCount { return NSUIntegerMax; } - (oneway void)release {} - (id)autorelease { return self; } @end /** * This Category is intended to allow easy testing of all objects for SPNotLoaded. */ @implementation NSObject (SPNotLoadedTest) - (BOOL)isSPNotLoaded { static id SPNotLoadedForComparison; if (!SPNotLoadedForComparison) SPNotLoadedForComparison = [SPNotLoaded notLoaded]; return (self == SPNotLoadedForComparison); } @end