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Queue.java

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/* Cyclops
 * FER - SPVP
 * Fakultet elektrotehnike i racunarstva (http://www.fer.hr/)
 * Unska 3, 10000 Zagreb, Hrvatska
 * (c) 2001 FER, Zagreb.
 */

package hr.fer.zesoi.cyclops;

import java.util.*;


public class Queue
{

    protected int max_capacity;

    protected int number_of_packets;

    private Stack storage_buffer = new Stack();

    public Queue ()
    {
        max_capacity = 1;
        number_of_packets = 0;
    }
    /* Queue */

    public Queue (int capacity)
    {
        max_capacity = (capacity < 0)? 0: capacity;
        number_of_packets = 0;
    }
    /* Queue */

    public void setCapacity (int capacity)
    {
        while (capacity < number_of_packets)
            {
                this.get();
            }
        this.max_capacity = capacity;
    }
    /* setCapacity */

    public boolean isEmpty ()
    {
        return storage_buffer.isEmpty();
    }
    /* isEmpty */

    public boolean put (Object packet)
    {
        if (number_of_packets <= max_capacity)
            {
                storage_buffer.push(packet);
                number_of_packets = number_of_packets + 1;
                return true;
            }
        else
            {
                return false;
            }
    }
    /* put */

    public Object get ()
    {
        Object packet;

        if (number_of_packets > 0)
            {
                number_of_packets = number_of_packets - 1;
                packet = storage_buffer.pop();
                return packet;
            }
        else
            {
                throw new NoSuchElementException("No more packages.");
            }
    }
    /* get */

    public Object peek ()
    {
        return storage_buffer.peek();
    }
    /* peek */

}
/* Queue */

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