package tree;

import exceptions.BoundaryViolationException;
import exceptions.EmptyTreeException;
import exceptions.InvalidPositionException;
import position.Position;

import java.util.Iterator;

/**
 * Created with xgiovio.macbookair.
 * User: xgiovio
 * Date: 07/04/14
 * Time: 15:17
 */
public interface Tree<E> extends Iterable<E> {


    public int size();
    public boolean isEmpty();

    public Iterable<Position<E>> positions ();
    public E replace (Position<E> v, E e) throws InvalidPositionException;
    public Position<E> root () throws EmptyTreeException;
    public Position<E> parent (Position <E> v) throws InvalidPositionException, BoundaryViolationException;
    public Iterable <Position<E>> children (Position<E> v) throws InvalidPositionException; // anche se e' foglia

    public boolean isInternal (Position<E> v) throws InvalidPositionException;
    public boolean isExternal (Position<E> v) throws InvalidPositionException;
    public boolean isRoot (Position <E> v) throws InvalidPositionException;


}