package jungle.test.operations;

import java.util.Iterator;
import java.util.LinkedList;

import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.NodePath;
import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.util.Pair;

public class NetworkNodePath implements NodePath
{
	LinkedList<Integer> path;
	
	public NetworkNodePath() {
		path = new LinkedList<Integer>();
	}
	
	private NetworkNodePath(LinkedList<Integer> _path) {
		path = _path;
	}
	
	@Override
	public Iterator<Integer> iterator() {
		return path.iterator();
	}

	@Override
	public NetworkNodePath add(int _pos) {
		LinkedList<Integer> newPath = copyPath();
		newPath.add(_pos);
		return new NetworkNodePath(newPath);
	}

	@Override
	public Pair<Integer, NodePath> pop() {
		LinkedList<Integer> cPath = copyPath();
		int e = cPath.getFirst();
		cPath.remove();
		return new Pair<Integer, NodePath>(e, new NetworkNodePath(cPath));
	}

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

	private LinkedList<Integer> copyPath() {
		LinkedList<Integer> newPath = new LinkedList<Integer>();
		for (Integer i : path) {
			newPath.add(i);
		}
		return newPath;
	}
	
	@Override
	public String toString() {
		return path.toString();
	}
	
}