NilCategories.m

//
//  NilCategories.m
//
//  Created by Vincent Gable on 2009-04-21
//  Copyright 2009 Vincent Gable. All rights reserved.
//

#import "NilCategories.h"
#import "VTPG_Common.h"

@implementation NSString (NilCategories)
//builds a URL from the string
//
//+[NSURL URLWithString:] throws an exception for nil, but this is considered as designed.
- (NSURL*) convertToURL;
{
	return [NSURL URLWithString:self];
}

//+[NSURL URLWithString:relativeToURL:] throws an exception
- (NSURL*) convertToURLRelitiveToURL:(NSURL*)baseURL;
{
	if(!baseURL)
		return nil;
	return [NSURL URLWithString:self relativeToURL:baseURL];
}

@end

@implementation NSArray (NilCategories)
- (id) objectOrNilAtIndex:(NSUInteger)i;
{	
	if(i >= [self count] || i < 0)
		return nil;	
	return [self objectAtIndex:i];
}
@end

@implementation NSMutableDictionary (NilCategories)

- (void) setObjectToObjectForKey:(id)key inDictionary:(NSDictionary*)otherDictionary;
{
	id obj = [otherDictionary objectForKey:key];
	if(obj)
		[self setObject:obj forKey:key];
}


@end