package clist.visitor;

import clist.*;

/**
* Prints the host CLList in the clockwise direction via System.out.
*/
public class PrintClockwise implements ICLVisitor
{
	public final static PrintClockwise Singleton = new PrintClockwise ();

	private PrintClockwise()
	{
   }

	/**
   * Prints a new line.
	 * @param host 
	 * @param stop 
	 * @param inp 
	 * @return 
	 */
	public Object forEmpty ( CLList host, CLList stop, Object inp)
	{
      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.
	 * @param host 
	 * @param stop 
	 * @param inp 
	 * @return 
	 */
	public Object forNonEmpty (CLList host, CLList stop, Object inp)
	{
      CLList tail = host.getClockwiseTail();
      if (tail.equals (stop))
      {
         System.out.println (host.getClockwiseDat ());
      }
      else
      {
         System.out.print (host.getClockwiseDat () + " ");
         tail.execClockwise (this, stop, null);
      }
		return null;
	}
}