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/** Implementation of NSNotification for GNUstep
Copyright (C) 1996 Free Software Foundation, Inc.
Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
Created: March 1996
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 31 Milk Street #960789 Boston, MA 02196 USA.
<title>NSNotification class reference</title>
$Date$ $Revision$
*/
#import "common.h"
#define EXPOSE_NSNotification_IVARS 1
#import "Foundation/NSNotification.h"
#import "Foundation/NSCoder.h"
#import "Foundation/NSDictionary.h"
@class GSNotification;
@interface GSNotification : NSObject // Help the compiler
@end
/**
* <p>Represents a notification for posting to an [NSNotificationCenter].
* Consists of a name, an object, and an optional dictionary. The
* notification center will check for observers registered to receive
* either notifications with the name, the object, or both and pass the
* notification instance on to them.</p>
* <p>This class is actually the interface for a class cluster, so instances
* will be of a (private) subclass.</p>
*/
@implementation NSNotification
static Class abstractClass = 0;
static Class concreteClass = 0;
+ (id) allocWithZone: (NSZone*)z
{
if (self == abstractClass)
{
return (id)NSAllocateObject(concreteClass, 0, z);
}
return (id)NSAllocateObject(self, 0, z);
}
+ (void) initialize
{
if (concreteClass == 0)
{
abstractClass = [NSNotification class];
concreteClass = [GSNotification class];
}
}
/**
* Create a new autoreleased notification.
*/
+ (NSNotification*) notificationWithName: (NSString*)name
object: (id)object
userInfo: (NSDictionary*)info
{
return [concreteClass notificationWithName: name
object: object
userInfo: info];
}
/**
* Create a new autoreleased notification by calling
* +notificationWithName:object:userInfo: with a nil user info argument.
*/
+ (NSNotification*) notificationWithName: (NSString*)name
object: (id)object
{
return [concreteClass notificationWithName: name
object: object
userInfo: nil];
}
/**
* The abstract class implements a copy as a simple retain ...
* subclasses override to perform more intelligent copy operations.
*/
- (id) copyWithZone: (NSZone*)zone
{
return [self retain];
}
/**
* Return a description of the parts of the notification.
*/
- (NSString*) description
{
return [[super description] stringByAppendingFormat:
@" Name: %@ Object: %@ Info: %@",
[self name], [self object], [self userInfo]];
}
- (NSUInteger) hash
{
return [[self name] hash] ^ [[self object] hash];
}
- (id) init
{
if ([self class] == abstractClass)
{
NSZone *z = [self zone];
DESTROY(self);
self = (id)NSAllocateObject (concreteClass, 0, z);
}
return self;
}
- (BOOL) isEqual: (id)other
{
NSNotification *o;
NSObject *v1;
NSObject *v2;
if (NO == [(o = other) isKindOfClass: [NSNotification class]]
|| ((v1 = [self name]) != (v2 = [o name]) && ![v1 isEqual: v2])
|| ((v1 = [self object]) != (v2 = [o object]) && ![v1 isEqual: v2])
|| ((v1 = [self userInfo]) != (v2 = [o userInfo]) && ![v1 isEqual: v2]))
{
return NO;
}
return YES;
}
/**
* Returns the notification name.
*/
- (NSString*) name
{
[self subclassResponsibility: _cmd];
return nil;
}
/**
* Returns the notification object.
*/
- (id) object
{
[self subclassResponsibility: _cmd];
return nil;
}
/**
* Returns the notification user information.
*/
- (NSDictionary*) userInfo
{
[self subclassResponsibility: _cmd];
return nil;
}
/*
* NSCoding protocol - the MacOS-X documentation says it should conform,
* but how can we meaningfully encode/decode the object and userInfo.
* We do it anyway - at least it should make sense over DO.
*/
- (void) encodeWithCoder: (NSCoder*)aCoder
{
id o;
o = [self name];
[aCoder encodeValueOfObjCType: @encode(id) at: &o];
o = [self object];
[aCoder encodeValueOfObjCType: @encode(id) at: &o];
o = [self userInfo];
[aCoder encodeValueOfObjCType: @encode(id) at: &o];
}
- (id) initWithCoder: (NSCoder*)aCoder
{
NSString *name;
id object;
NSDictionary *info;
id n;
[aCoder decodeValueOfObjCType: @encode(id) at: &name];
[aCoder decodeValueOfObjCType: @encode(id) at: &object];
[aCoder decodeValueOfObjCType: @encode(id) at: &info];
n = [NSNotification notificationWithName: name object: object userInfo: info];
RELEASE(name);
RELEASE(object);
RELEASE(info);
DESTROY(self);
return RETAIN(n);
}
@end
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