import java.util.*;

//http://www.moviemalls.com/M/memento.htm

/**
 * This obeys the Stack protocol and is used for storing and retrieving Mementos.
 * <br>Memento Design Pattern example for COM1204 Summer 2003.
 *
 * @author Bob Futrelle
 * @version 0.1, 4 July 2003
 *
 */
 
 public class StateStore extends Stack{
 	
	void addMemo(Engine eng) {
		push(eng.getMemo());
		System.out.println("Saving state " + eng.getResult());
	}
	void redoMemo(Engine eng) {
		if(!empty()) {
			eng.reset(pop());
			System.out.println("State restored to " + eng.getResult());
		}
		else System.out.println("No more saved states.");
	}
 } // class StateStore