package list.visitor;

import list.*;

public class MakeClone implements IListAlgo
{
    public final static MakeClone Singleton = new MakeClone();

    private MakeClone()
    {
    }

    /**
     *Returns an empty list.
     * host receives and empty list
     * input receives null
     */
    public Object forEmpty(AList host, Object input)
    {
	return ListFactory.Singleton.makeEmptyList();
    }
    
    /**
     * Returns an exact copy of the list
     * host receives and a list
     * input receives null
     */
    public Object forNonEmpty(AList host, Object input)
    {
	return ListFactory.Singleton.makeNEList(host.getFirst(), (AList)host.getRest().execute(this, null));
    }
   
}