/*
 * CS220_Stack_Interface.java
 * 
 * Created on Jun 4, 2007
 * 
 * by Donald Yessick
 */

/**
 * CS220_Stack_Interface
 * @author Donald Yessick
 * @
 */
public interface CS220_Stack_Interface {
	/**
	 * isEmpty returns the stack status
	 * @return true if the stack has no objects
	 */
	boolean isEmpty();
	
	/**
	 * getCount provides the number of objects stored in the stack
	 * @return number of objects in stack
	 */
	int getCount();
	
	/**
	 * push adds an item to the stack
	 * @param object to be added
	 */
	void push(Object object);
	
	/**
	 * pop removes the top item on the stack
	 * @return the object at top
	 */
	Object pop();
	
	/**
	 * peek fetches the top object on the stack
	 * @return the object at top
	 */
	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);

}