/**
 * @(#)Snake.java
 * @A snake with all points of the snake.
 *
 * @Link Scholes
 * @version 1.00 2008/7/21
 */

package Data;

//Java core packages
import java.util.*;

public class Snake
{
	private int length;
	private int tail;
	private int points[];
	private ArrayList<Integer> snake;
	
	//construct a snake with only one head in the specified position
	public Snake(int a)
	{
		length = 1;
		snake = new ArrayList<Integer>(1);
		snake.add(new Integer(a));
	}
	
	//get the length of the snake
	public int getLength()
	{
		return length;
	}
	
	//add a new head to the snake
	public void addHead(int n)
	{
		snake.add(0,new Integer(n));
	}
	
	//cut the tail of the snake
	public int cutTail()
	{
		tail = ((Integer)snake.get(length - 1)).intValue();
		snake.remove(length - 1);
		return tail;
	}
	
	//increase the length of the snake
	public void increase()
	{
		length ++;
		snake.ensureCapacity(length);
	}
	
	//decrease the length of the snake
	public void decrease()
	{
		length --;
		snake.trimToSize();
	}
	
	//clear all the points of the snake
	public int[] clear()
	{
		points = new int[length - 1];
		
		for (int i = 0;i < length - 1;i ++)
		{
			points[i] = ((Integer)snake.get(i)).intValue();
		}
		
		return points;
	}
}	//end class Snake