/*
 * CS220_Queue_Interface.java
 * 
 * Created on Jun 4, 2007
 * 
 * by Donald Yessick
 */

/**
 * CS220_Queue_Interface
 * @author Donald Yessick
 * @
 */
public interface CS220_Queue_Interface {
	/**
	 * isEmpty returns the queues status
	 * @return true if the queue has no objects
	 */
	boolean isEmpty();
	
	/**
	 * getCount provides the number of elements in the queue
	 * @return number of objects in queue
	 */
	int getCount();

	/**
	 * enqueue adds an object to end of queue (tail)
	 * @param object
	 */
    void enqueue(Object object);
    
    /**
     * dequeue removes an object from the head of the queue
     * @return the object removed
     */
    Object dequeue();
    
    /**
     * peek fetches an object from the head of the queue
     * @return the object at front of the queue 
     */
    Object peek();
	/**
	 * visit each element using the visitor design pattern
	 * visit
	 * @param v the visitor implementing a visit(object) method
	 */
	void visit(CS220_Visitor_Interface v);

}