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A4Set.java
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A4Set.java
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import java.util.Collection;
import java.util.Iterator;
import java.util.Set;
public class A4Set<E extends Comparable<E>> implements Set<E> {
private class Node {
private E e;
private Node left;
private Node right;
private boolean color;
public Node(E e, boolean color){
this.e = e;
this.color = color;
}
}
private static final boolean RED = true;
private static final boolean BLACK = false;
private Node root;
private int size = 0;
public A4Set () {
}
//Node Helper method
private boolean isRed(Node n) {
if (n == null)
return false;
return n.color == RED;
}
//rotate subtree of Node n right
private Node rotateRight(Node n) {
Node rot = n.left;
n.left = rot.right;
rot.right = n;
rot.color = rot.right.color;
rot.right.color = RED;
return rot;
}
//rotate subtree of Node n left
private Node rotateLeft(Node n) {
Node rot = n.right;
n.right = rot.left;
rot.left = n;
rot.color = rot.left.color;
rot.left.color = RED;
return rot;
}
private void flipColors(Node n) {
n.color = !n.color;
n.right.color = !n.right.color;
n.left.color = !n.left.color;
}
@Override
public boolean add(E e) {
// TODO Auto-generated method stub
if (e == null)
throw new IllegalArgumentException();
if (contains(e) == true) {
return false;
}
size++;
root = add(root, e);
return true;
}
private Node add(Node n, E e) {
if(n == null) {
return new Node(e, RED);
}
int compared = e.compareTo(n.e);
if (compared < 0) {
n.left = add(n.left, e);
}
else if (compared > 0) {
n.right = add(n.right, e);
}
else {
n.e = e;
}
// to rebalance tree if necessary and enforce invariant
if(isRed(n.right) && !isRed(n.left))
n = rotateLeft(n);
if(isRed(n.left) && isRed(n.left.left))
n = rotateRight(n);
if(isRed(n.right) && !isRed(n.left))
flipColors(n);
return n;
}
@Override
public void clear() {
// TODO Auto-generated method stub
root = null;
}
@Override
public boolean contains(Object obj) {
return contains(root, obj);
}
private boolean contains(Node n, Object obj) {
while(n != null) {
int compare = ((E) obj).compareTo(n.e);
if (compare < 0)
n = n.left;
else if (compare > 0)
n = n.right;
else
return true;
}
return false;
}
@Override
public int size() {
// TODO Auto-generated method stub
return size;
}
public String toString() {
return null;
}
//BONUS
// @Override
// public boolean remove(Object obj) {
// if (obj == null)
// throw new IllegalArgumentException();
//
// if(contains(obj) != true)
// return false;
//
// if (!isRed(root.left) && !isRed(root.right))
// root.color = RED;
//
//
// root = remove(root, obj);
// return true;
// }
//
// private Node remove(Node n, Object obj) {
//
// }
@Override
public boolean addAll(Collection<? extends E> arg0) {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public boolean containsAll(Collection<?> arg0) {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public Iterator<E> iterator() {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public boolean removeAll(Collection<?> arg0) {
throw new UnsupportedOperationException();
}
@Override
public boolean retainAll(Collection<?> arg0) {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public Object[] toArray() {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
@Override
public <T> T[] toArray(T[] arg0) {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
}