package clist.visitor;

import clist.*;

/**
 * Prints the host CList in the clockwise direction via System.out.
 */
public class PrintClockwise implements IAlgo
{
    private CList _stop;

    public PrintClockwise(CList stop)
    {
        _stop = stop;
    }

    /**
     * Prints a new line.
     */
    public Object emptyCase(CList host, Object input)
    {
        System.out.println();
        return null;
    }

    /**
     * Needs to distinguish the case when the host has one element
     * from the case when the host has more than one element.
     */
    public Object nonEmptyCase(CList host, Object input)
    {
        CList tail = host.getRestClockwise();

        if (tail.equals(_stop))
            System.out.println(host.getFirstClockwise());
        else {
            System.out.print(host.getFirstClockwise() + " ");

            tail.executeClockwise(this, input);
        }
        return null;
    }
}