package list.dl.algo;

import list.dl.DLList;

/**
 * Counts the number of elements to the right the host.
 */
public class RightCount implements IAlgoRight
{
	final public static RightCount Singleton = new RightCount();
	private RightCount()
	{
	}

	/**
	 * @param hostList
	 * @param inputParam
	 * @return 
	 */
	public Object rightEndCase(DLList host, Object inputParam)
	{
		return new Integer (0);
	}

	/**
	 * @param hostList 
	 * @param inputParam
	 * @return 
	 */
	public Object dataNodeCase(DLList host, Object inputParam)
	{
      Integer restCount = (Integer) host.getRightRest ().executeRight (this, null);
		return new Integer (1 + restCount.intValue ());
	}

}