MHHistory

MHHistory.m

// interface file

@interface MHHistory : NSObject
{
	NSMutableArray *_historyArray;
}

@property (nonatomic, retain) NSMutableArray *historyArray;

@end

+(MHHistory*)sharedTrackHistory;
-(void)addTrack:(MHTrack*)track;
-(NSUInteger)numberOfTracksInHistory;
-(MHTrack*)trackAtLocation:(NSUInteger)location;


// implementation file

@implementation MHistory;


@synthesize historyArray = _historyArray

static MHHistory* _staticHistory;

+(MHHistory*)sharedTrackHistory;
{
	if (_staticHistory==nil) {
		_staticHistory = [[MHHistory alloc] init];
	}
	return _staticHistory;
}

- (id)init
{
	if((self = [super init]))
	{
		self.historyArray = [[NSMutableArray alloc] init];	
	}
	return self;
}

-(void)addTrack:(MHTrack*)track;
{
	[self.historyArray addObject:track];
}

-(NSUInteger)numberOfTracksInHistory;
{
	return [self.historyArray count];
}

-(MHTrack*)trackAtLocation:(NSUInteger)location;
{
	if (location < [self numberOfTracksInHistory] )
	{
		return [self.historyArray objectAtIndex:location];
	}
	else {
		return nil;
	}
}

-(MHTrack*)lastTrack;
{
	return [self.historyArray lastObject];
}

-(NSArray*)allTracks;
{
	return self.historyArray;
}

@end