package sequence.utility;

import exceptions.InvalidPositionException;
import position.Position;


/**
 * A simple node class for a doubly-linked list.  Each DNode has a
 * reference to a stored element, a previous node, and a next node.
 * 
 * @author Roberto Tamassia
 */
//Copyright (c) 2003 Brown University, Providence, RI
//Additional modifications and methods by xgiovio

// used on ArraySequence


public class ArrayPosition<E> implements Position<E> {
  private E element = null;
  private int index = -1;


  public ArrayPosition(E elem, int in_idex) {

    element = elem;
    index = in_idex;
  }
  public ArrayPosition(E elem) {

        element = elem;
  }

  public E element() throws InvalidPositionException {
    if (index == -1)
      throw new InvalidPositionException("Position is not in a list!");
    return element;
  }


  public void setElement(E newElement) { element = newElement; }

    public int getIndex() {
        return index;
    }

    public void setIndex(int index) {
        this.index = index;
    }
}