NSIndexPath_Extensions.m

//
//  NSIndexPath_Extensions.m
//  SortedTree
//
//  Created by Jonathan Dann on 14/05/2008.
//
// Copyright (c) 2008 Jonathan Dann
//
// 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.
//
// If you use it, acknowledgement in an About Page or other appropriate place would be nice.
// For example, "Contains "Sorted Tree" by Jonathan Dann" will do.

#import "NSIndexPath_Extensions.h"


@implementation NSIndexPath (ESExtensions)
- (NSUInteger)firstIndex;
{
	return [self indexAtPosition:0]; 
}

- (NSUInteger)lastIndex;
{
	return [self indexAtPosition:[self length] - 1];
}

- (NSIndexPath *)indexPathByIncrementingLastIndex;
{
	NSUInteger lastIndex = [self lastIndex];
	NSIndexPath *temp = [self indexPathByRemovingLastIndex];
	return [temp indexPathByAddingIndex:++lastIndex];
}

- (NSIndexPath *)indexPathByReplacingIndexAtPosition:(NSUInteger)position withIndex:(NSUInteger)index;
{
	NSUInteger indexes[[self length]];
	[self getIndexes:indexes];
	indexes[position] = index;
	return [[[NSIndexPath alloc] initWithIndexes:indexes length:[self length]] autorelease];
}
@end