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/*************************************************************************
* File Name: NSArray+MiscExtensions.m
* Version : 0.0 alpha
* Date : Thu 31-Aug-1997
*************************************************************************
* COPYWHAT (C) 1997 by Tomi Engel
*
* This notice may not be removed from this source code.
* The use and distribution of this software is governed by the
* terms of the MiscKit license agreement. Refer to the license
* document included with the MiscKit distribution for the terms.
* ALL RIGHTS RESERVED
*
*************************************************************************
* Notes :
* Bugs :
* Author(s) : tsengel
* Last update: $Date: 1997/08/31 20:02:57 $
* History : $Log: NSArray+MiscExtensions.m,v $
* History : Revision 1.0 1997/08/31 20:02:57 tsengel
* History : Added to the MiscKit repository
* History :
*************************************************************************/
#import "NSArray+MiscExtensions.h"
@implementation NSArray (MiscExtensions)
/*"
This category provides a number of generally useful convenience methods for the NSArray class cluster.
"*/
- (BOOL)isEmpty
/*"
Returns YES if there are no objects inside the array. NO otherwise.
"*/
{
if( [self count] > 0 ) return NO;
else return YES;
}
- (id)firstObject
/*"
If there are object in this array this methods returns the #objectAtIndex 0. Returns nil if the array is empty.
"*/
{
if( [self count] > 0 ) return [self objectAtIndex:0];
else return nil;
}
- (BOOL)boolAtIndex:(unsigned)index
/*"
Uses #objectAtIndex: to find the right target and if it responds to the message #boolValue it returns the related value.
If the object does not respond to that message the value NO is returned (is NO really the best value for a failure ??)
"*/
{
id theValue = [self objectAtIndex:index];
if( [theValue respondsToSelector:@selector(boolValue)] )
return [theValue boolValue];
else return NO;
}
- (char)charAtIndex:(unsigned)index
/*"
Uses #objectAtIndex: to find the right target and if it responds to the message #charValue it returns the related value.
If the object does not respond to that message the value 0 is returned (is "0" really the best value for a failure ??)
"*/
{
id theValue = [self objectAtIndex:index];
if( [theValue respondsToSelector:@selector(charValue)] )
return [theValue charValue];
else return 0;
}
- (float)floatAtIndex:(unsigned)index
/*"
Uses #objectAtIndex: to find the right target and if it responds to the message #floatValue it returns the related value.
If the object does not respond to that message the value 0 is returned (is "0" really the best value for a failure ??)
"*/
{
id theValue = [self objectAtIndex:index];
if( [theValue respondsToSelector:@selector(floatValue)] )
return [theValue floatValue];
else return 0;
}
- (double)doubleAtIndex:(unsigned)index
/*"
Uses #objectAtIndex: to find the right target and if it responds to the message #doubleValue it returns the related value.
If the object does not respond to that message the value 0 is returned (is "0" really the best value for a failure ??)
"*/
{
id theValue = [self objectAtIndex:index];
if( [theValue respondsToSelector:@selector(doubleValue)] )
return [theValue doubleValue];
else return 0;
}
@end
@implementation NSMutableArray (MiscExtensions)
/*"
This category provides a number of generally useful convenience methods for mutable arrays.
"*/
- (void)addAbsentObject:(id)anObject
/*"
If the anObject is not part of the array yet (check using the #containsObject method) it is considered absent and
inserted at the end of the receiver. The object receives a retain message as it's added to the array. If anObject is nil, an NSInvalidArgumentException is raised.
"*/
{
if( ![self containsObject:anObject] ) [self addObject:anObject];
}
- (void)removeFirstObject
/*"
Removes the object with the index 0 in the array and sends it a release message. removeFirstObject raises an NSRangeException if there are no objects in the array.
"*/
{
[self removeObjectAtIndex:0];
}
@end
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