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/* NSValue.h - Object encapsulation for C types.
Copyright (C) 1993,1994 Free Software Foundation, Inc.
Written by: Adam Fedor <fedor@boulder.colorado.edu>
Date: Mar 1995
This file is part of the GNU Objective C Class Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <objects/stdobjects.h>
#include <Foundation/NSConcreteValue.h>
#include <Foundation/NSCoder.h>
/* NSValueDecoder is a Class whose only purpose is to decode coded NSValue
objects. The only method(s) that should ever be called are +newWithCoder:
or -initWithCoder:. Should disallow any other method calls... */
@interface NSValueDecoder : NSValue
{
}
@end
@implementation NSValueDecoder
- initValue:(const void *)value
withObjCType:(const char *)type
{
[self shouldNotImplement:_cmd];
}
+ (id) newWithCoder: (NSCoder *)coder
{
char *type;
void *data;
id new_value;
[coder decodeValueOfObjCType:@encode(char *) at:&type];
[coder decodeValueOfObjCType:type at:&data];
/* Call NSNumber's implementation of this method, because NSValueDecoder
also stores NSNumber types */
new_value = [[NSNumber valueClassWithObjCType:type]
allocWithZone:[coder objectZone]];
[new_value initValue:data withObjCType:type];
OBJC_FREE(data);
OBJC_FREE(type);
return new_value;
}
/* Are you convinced that +newWithCoder is a better idea? Otherwise we
have to release ourselves and return a new instance of the correct
object. We hope that the calling method knows this and has nested the
alloc and init calls or knows that the object has been replaced. */
- (id) initWithCoder: (NSCoder *)coder
{
self = [super initWithCoder:coder];
[self autorelease];
return [NSValueDecoder newWithCoder:coder];
}
@end
@implementation NSValue
// NSCopying
/* deepening is done by concrete subclasses */
- deepen
{
return self;
}
- (id)copyWithZone:(NSZone *)zone
{
if (NSShouldRetainWithZone(self, zone))
return [self retain];
else
return [[super copyWithZone:zone] deepen];
}
/* Returns the concrete class associated with the type encoding */
+ (Class)valueClassWithObjCType:(const char *)type
{
Class theClass = [NSConcreteValue class];
/* Let someone else deal with this error */
if (!type)
return theClass;
if (strcmp(@encode(id), type) == 0)
theClass = [NSNonretainedObjectValue class];
else if (strcmp(@encode(NSPoint), type) == 0)
theClass = [NSPointValue class];
else if (strcmp(@encode(void *), type) == 0)
theClass = [NSPointerValue class];
else if (strcmp(@encode(NSRect), type) == 0)
theClass = [NSRectValue class];
else if (strcmp(@encode(NSSize), type) == 0)
theClass = [NSSizeValue class];
return theClass;
}
// Allocating and Initializing
+ (NSValue *)value:(const void *)value
withObjCType:(const char *)type
{
Class theClass = [self valueClassWithObjCType:type];
return [[[theClass alloc] initValue:value withObjCType:type]
autorelease];
}
+ (NSValue *)valueWithNonretainedObject: (id)anObject
{
return [[[NSNonretainedObjectValue alloc]
initValue:&anObject withObjCType:@encode(id)]
autorelease];
}
+ (NSValue *)valueWithPoint:(NSPoint)point
{
return [[[NSPointValue alloc]
initValue:&point withObjCType:@encode(NSPoint)]
autorelease];
}
+ (NSValue *)valueWithPointer:(const void *)pointer
{
return [[[NSPointerValue alloc]
initValue:&pointer withObjCType:@encode(void*)]
autorelease];
}
+ (NSValue *)valueWithRect:(NSRect)rect
{
return [[[NSRectValue alloc] initValue:&rect withObjCType:@encode(NSRect)]
autorelease];
}
+ (NSValue *)valueWithSize:(NSSize)size
{
return [[[NSSizeValue alloc] initValue:&size withObjCType:@encode(NSSize)]
autorelease];
}
// Accessing Data
/* All the rest of these methods must be implemented by a subclass */
- (void)getValue:(void *)value
{
[self subclassResponsibility:_cmd];
}
- (const char *)objCType
{
[self subclassResponsibility:_cmd];
return 0;
}
// FIXME: Is this an error or an exception???
- (id)nonretainedObjectValue
{
[self subclassResponsibility:_cmd];
return 0;
}
- (void *)pointerValue
{
[self subclassResponsibility:_cmd];
return 0;
}
- (NSRect)rectValue
{
[self subclassResponsibility:_cmd];
return NSMakeRect(0,0,0,0);
}
- (NSSize)sizeValue
{
[self subclassResponsibility:_cmd];
return NSMakeSize(0,0);
}
- (NSPoint)pointValue
{
[self subclassResponsibility:_cmd];
return NSMakePoint(0,0);
}
// NSCoding (done by subclasses)
- classForCoder
{
return [NSValueDecoder class];
}
- (void)encodeWithCoder:(NSCoder *)coder
{
[super encodeWithCoder:coder];
}
- (id)initWithCoder:(NSCoder *)coder
{
self = [super initWithCoder:coder];
return self;
}
@end
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