package org.hwo.collections;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Set;

public class LinkedListSet<T> implements Set<T> {

	private LinkedList<T> elements;
	
	public LinkedListSet(){
		this.elements = new LinkedList<>();
	}
	
	@Override
	public boolean add(T e) {
		if (elements.contains(e))
			return false;
		return elements.add(e);
	}

	@Override
	public boolean addAll(Collection<? extends T> c) {
		boolean changed = false;
		for (T e: c) {
			if (add(e))
				changed = true;
		}
		return changed;
	}

	@Override
	public void clear() {
		elements.clear();
	}

	@Override
	public boolean contains(Object o) {
		return elements.contains(o);
	}

	@Override
	public boolean containsAll(Collection<?> c) {
		return elements.containsAll(c);
	}

	@Override
	public boolean isEmpty() {
		return elements.isEmpty();
	}

	@Override
	public Iterator<T> iterator() {
		return elements.iterator();
	}

	@Override
	public boolean remove(Object o) {
		return elements.remove(o);
	}

	@Override
	public boolean removeAll(Collection<?> c) {
		return elements.removeAll(c);
	}

	@Override
	public boolean retainAll(Collection<?> c) {
		return elements.retainAll(c);
	}

	@Override
	public int size() {
		return elements.size();
	}

	@Override
	public Object[] toArray() {
		return elements.toArray();
	}

	@Override
	public <T> T[] toArray(T[] a) {
		return elements.toArray(a);
	}

}