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NSNullDammit.m
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NSNullDammit.m
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#import "NSNullDammit.h"
@implementation NSObject (NSNullDammit)
- (void) setToNull:(NSString*)key
{
[NSNullDammit setToNull:key target:self];
}
- (void) setIndexToNull:(NSInteger)index
{
[NSNullDammit setIndexToNull:index target:self];
}
- (void) appendNull
{
[NSNullDammit appendNullTo:self];
}
@end
@implementation NSNullDammit
+ (void) setToNull:(NSString*)key target:(id)object
{
// change 'myProperty' to 'setMyProperty:'
// head = 'setM'
// tail = 'yProperty:'
NSString *head = [@"set" stringByAppendingString:[[key substringWithRange:NSMakeRange(0, 1)] capitalizedString]];
NSString *tail = [[key substringFromIndex:1] stringByAppendingString:@":"];
SEL setter = NSSelectorFromString([head stringByAppendingString:tail]);
if ( [object respondsToSelector:setter] )
[object performSelector:setter withObject:[NSNull null]];
else
[object setObject:[NSNull null] forKey:key];
}
+ (void) setIndexToNull:(NSInteger)index target:(id)object
{
if ( index >= [object count] )
[object insertObject:[NSNull null] atIndex:index];
else
[object replaceObjectAtIndex:index withObject:[NSNull null]];
}
+ (void) appendNullTo:(id)object
{
[object insertObject:[NSNull null] atIndex:[object count]];
}
@end