package rebelsky.list;

/**
 * Things that indicate positions in a simple list and can move.
 *
 * @author CSC152 2004F
 */
public interface SimpleCursor
{
	/**
	 * Get a value not yet visited by this cursor.
	 *
	 * @pre
	 *   Unvisited values remain in the list.
	 *   The list has not changed since this cursor was created.
	 * @exception NoSuchPosition
	 *   If no unvisited values remain in the list.
	 */
	public Object next()
		throws NoSuchPosition;

	/**
	 * Determine whether or not unvisited elements remain.
	 *
	 * @pre
	 *   The list has not changed since this cursor was created.
	 */
	public boolean hasNext();
} // interface SimpleCursor