/*

File: Queue.m

Abstract: Implementation file for the Queue class. This class makes use

of the NSMutableArray to define and maintain a standard queue data

structure to hold Cocoa objects. Objects can be added & removed from the

queue as desired and their order at insertion time is maintained.

Version: 1.0

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*/

#import "Queue.h"

@implementation Queue

// Initialize a empty mutable array for queue items

// which we can fill

- (id) init

{

    self = [super init];

    {

        mItemArray = [NSMutableArray arrayWithCapacity:0];

        [mItemArray retain];

    }

    return self;

}

// Returns (and removes) the oldest item in the queue

-(id)returnAndRemoveOldest

{

    id anObject = nil;

    anObject = [mItemArray lastObject];

    if (anObject)

    {

        [anObject retain];

        [mItemArray removeLastObject];      

    }

    return anObject;    

}

// Adds the specified item to the queue

-(void)addItem:(id)anItem

{

    [mItemArray insertObject:anItem atIndex:0];

}

- (void) dealloc

{

    [mItemArray release];

    [super dealloc];

}

@end