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phifty on 08/11/09

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Last Edited at 08/11/09 09:54pm

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Lite KVC Wrapper

/ Published in: Objective C

This is a wrapper for objects that use Key-Value Coding (KVC) in Objective-C. An appropriate use would be for business objects whose state changes throughout the life of the application session.

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//
//  KVCEnabledObject.h
//
 
#import <Foundation/Foundation.h>
 
 
@interface KVCEnabledObject : NSObject {
    NSMutableDictionary *_metadata;
}
 
@end
 
@implementation KVCEnabledObject
 
- (id)init
{
    if (self = [super init]) {
        _metadata = [[NSMutableDictionary alloc] initWithCapacity:0];
    }
}
 
- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
    if (nil != value) {
        [_metadata setValue:value forKey:key];
    }
}
 
- (void)setNilValueForKey:(NSString *)theKey
{
    [_metadata setValue:[NSNull null] forKey:key];
}
 
- (id)valueForUndefinedKey:(NSString *)key
{
    id ret = [_metadata valueForKey:key];
    return ([ret isKindOfClass:[NSNull class]]) ? nil : ret;
}
 
- (void)dealloc
{
    [_metadata removeAllObjects];
    [_metadata release];
 
    [super dealloc];
}
 
@end

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