package org.vaadin.addons.lazyquerycontainer;

import java.util.AbstractList;
import java.util.RandomAccess;

public class NaturalNumbersList extends AbstractList<Integer> implements
		RandomAccess, java.io.Serializable {
	private static final long serialVersionUID = -2764017481108945198L;
	private final int size;

	public NaturalNumbersList(int size) {
		this.size = size;
	}

	public int size() {
		return size;
	}

	public Integer[] toArray() {
		Integer[] array = new Integer[size];
		for (int i=0; i<size; i++)
			array[i] = i;
		return array;
	}

	@SuppressWarnings("unchecked")
	public <T> T[] toArray(T[] a) {
		if (a.length < size)
			a = (T[]) new Integer[size];
		for (int i=0; i<size; i++)
			a[i] = (T)Integer.valueOf(i);
		if (a.length > size)
			a[size] = null;
		return a;
	}

	public Integer get(int index) {
		if (index<0 || index>=size)
			throw new IndexOutOfBoundsException();
		return index;
	}

	public Integer set(int index, Integer element) {
		throw new UnsupportedOperationException();
	}

	public int indexOf(Object o) {
		if (o == null)
			return -1;
		if (o instanceof Integer){
			int i = (Integer) o;
			if (i<0 || i>= size)
				return -1;
			return i;
		}
		return -1;
	}

	public boolean contains(Object o) {
		return indexOf(o) != -1;
	}
}