gabriel / gh-kit

//
//  GHNSDictionary+NSNull.m
//  Created by Jae Kwon on 5/12/08.
//
//  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.
//
 
#import "GHNSDictionary+NSNull.h"
 
@implementation NSDictionary (GHNSNull)
 
+ (id)gh_dictionaryWithKeysAndObjectsMaybeNilWithKey:(id)firstKey args:(va_list)args {
	if (!firstKey) return [self dictionary];
 
	NSMutableArray *keys = [[NSMutableArray alloc] init];
	NSMutableArray *values = [[NSMutableArray alloc] init];
	id key = firstKey;	
	do {
		id value = va_arg(args, id);
		if (!value) value = [NSNull null];
		[keys addObject:key];
		[values addObject:value];
		key = va_arg(args,id);
	} while(key);
	NSDictionary *dict = [self dictionaryWithObjects:values forKeys:keys];
	[keys release];
	[values release];
	return dict;
}
 
+ (id)gh_dictionaryWithKeysAndObjectsMaybeNil:(id)firstKey, ... {	
	va_list args;
  va_start(args, firstKey);
	NSDictionary *dict = [self gh_dictionaryWithKeysAndObjectsMaybeNilWithKey:firstKey args:args];
	va_end(args);
	return dict;
}
 
- (id)gh_objectMaybeNilForKey:(id)key {
	id object = [self objectForKey:key];
	if (object == [NSNull null] || [object isEqual:[NSNull null]])
		return nil;
 
	return object;
}
 
@end
 
@implementation NSMutableDictionary (GHNSNull)
 
- (void)gh_setObjectMaybeNil:(id)object forKey:(id)key {
	if (!object) object = [NSNull null];
	[self setObject:object forKey:key];
}
 
@end