/**
* Removes and returns the minimum of the non-empty input list.
* Assumes host is a sublist of the non-empty input list.
* @author Dung X. Nguyen - Copyright 1999 - All rights reserved.
*/
public class RemMinHelper implements IAlgo
{
	public final static RemMinHelper Singleton = new RemMinHelper ();

	private RemMinHelper()
	{
	}

	/**
	 * @param host a sublist of input.
	 * @param input a non-empty QFList of Integers.
	 * @return 
	 */
	public Object nullCase(QFList host, Object input)
	{
		return ((QFList)input).removeFront();
	}

	/**
	 * @param host a sublist of input.
	 * @param input a non-empty QFList of Integers.
	 * @return
	 */
	public Object nonNullCase(QFList host, Object input)
	{
      Integer hostFirst = (Integer)host.getFirst();
      Integer inputFirst = (Integer)((QFList)input).getFirst ();
      return
         hostFirst.intValue() < inputFirst.intValue()?
            host.getRest().execute(this, host):
            host.getRest().execute(this, input);
	}
}