package list.dl.algo;

import list.dl.DLList;

/**
* Prints the left side of the host from the left end to where the host is.
*/
public class PrintLeft implements IAlgoLeft
{
	public final static PrintLeft Singleton = new PrintLeft ();
	private PrintLeft()
	{
	}

	/**
	 * @param host 
	 * @param input 
	 * @return 
	 */
	public Object leftEndCase(DLList host, Object input)
	{
		return null;
	}

	/**
	 * @param host 
	 * @param input 
	 * @return 
	 */
	public Object dataNodeCase(DLList host, Object input)
	{
      host.getLeftRest ().executeLeft (this, null);
      System.out.print (" " + host.getLeftFirst ());
		return null;
	}
}