package deques;

import java.util.Enumeration;

/**
 * A deque interface
 */
public interface IDeque
{
    /**
     * Adds a new object to the deque on the left end.
     */
    public void enqueueLeft(Object data);

    /**
     * Adds a new object to the deque on the right end.
     */
    public void enqueueRight(Object data);

    /**
     * Removes and returns the object on the left end.
     */
    public Object dequeueLeft();

    /**
     * Removes and returns the object on the right end.
     */
    public Object dequeueRight();

    /**
     * Returns an Enumeration of the deque.
     */
    public Enumeration enumeration();
}