/* Copyright (c) 2012-2014. The SimGrid Team.
 * All rights reserved.                                                     */

/* This program is free software; you can redistribute it and/or modify it
 * under the terms of the license (GNU LGPL) which comes with this package. */

package kademlia;

import java.util.ArrayList;

/**
 * Stores the information held in a bucket
 */
public class Bucket {
	private ArrayList<Integer> nodes;
	private int id;
	
	/**
	 * Constructor
	 */
	public Bucket(int id) {
		this.nodes = new ArrayList<Integer>();
		this.id = id;
	}
	/**
	 * Returns the bucket's id.
	 */
	public int getId() {
		return this.id;
	}
	/**
	 * Returns how many nodes there is in the bucket
	 */
	public int size() {
		return nodes.size();
	}
	/**
	 * Returns if the bucket contains the element
	 */
	public boolean contains(int id) {
		return nodes.contains(id);
	}
	/**
	 * Add an to the front of the bucket
	 */
	public void add(int id) {
		nodes.add(0,id);
	}
	/**
	 * Pushs an element into the front of a bucket.
	 */
	public void pushToFront(int id) {
		int i = nodes.indexOf(id);
		nodes.remove(i);
		nodes.add(0, id);
	}
	/**
	 * Returns a node
	 */
	public int getNode(int id) {
		return nodes.get(id);
	}
	/**
	 * Adds the content of the bucket into a answer object.
	 */
	public void addToAnswer(Answer answer, int destination) {
		for (int id : this.nodes) {
			answer.getNodes().add(new Contact(id,id ^ destination));
		}
	}
	
	@Override
	public String toString() {
		return "Bucket [id= " + id + " nodes=" + nodes + "]";
	}
	
}